Indonesia Conference Directory

Corresponding Author
Tedy Agung Cahyadi

Institutions
1Universitas Pembangunan Nasional “Veteran” Yogyakarta, Indonesia
2Dewatering Engineer, PT Bukit Asam Tbk

Abstract
This research was conducted in the North Sump area of the Air Laya Mining Unit at the Tanjung Enim, PT Bukit Asam Tbk. The sump is a former open pit mining area in the form of a very large basin. Previously this sump functioned to gathers water from the pit. Since there is no mining operation in that pit, then that sump-s functionality is changed into a disposal area, so the sump is needed to be dried. The draining plan is carried out with mine drainage and mine dewatering. Mine drainage is an effort to prevent runoff water to enters the sump. Mine dewatering is the effort to remove water from the sump by pumping. The initial draining plan is not able to dry the sump. It can be seen from the water surface-s elevation on the sump that has not decreased, so it is necessary to study the plan to drain the sump. The study conducted considers the calculation of the water balance. Water balance is influenced by inflow in the form of runoff water and outflow in the form of evaporation and pumping. Based on the calculation of the water balance, three alternatives are proposed in sump drying, which from each alternative can be seen changes in the volume and depth of the sump in a certain period. Alternative I is done by adding the number of pumps, the alternative II is done by increasing the pump impeller rotation, and the alternative III is done with alternative I and alternative II combination. The alternative chosen is alternative III with a drying time of 72 days.

Keywords
Dewatering, Pump Network, Alternative Aproach

Topic
Mining and Metallurgy Engineering

Link: https://ifory.id/abstract/ercpYqmdJfAV

Corresponding Author
Taruna Fadillah

Institutions
Mine Operation Department, Antam Pongkor Underground Gold Mine, Indonesia

Abstract
The stability of tunneling in the underground mine is an important factor in the production of mines that must ensure productivity and safety. In Antam Underground Gold Mine, the production cycle starts by drilling the tunnel then charge the explosive material. After that, the tunnel is blasted before the ore mucking activity. The activity continues to reinforcing the tunnel and back again to the beginning of the cycle, drilling activity. The drilling is using Jumbo Drill which has 3-meter drilling rod. With span progress is about 2.7 from 3 meters or 90% of the drilling rod length, in a tunnel with dimension 5-meter-high and 5-meter-wide, the mining is producing 170 tons in 8 hours which can be considered the productivity 21.25 ton per hour each Jumbo Drill. Among many rock conditions affecting stability, the width and height of tunnel are an important design factor. In this paper, the aim is to optimizing blasting activity by considering the maximum unsupported span (MUS) using the Q system. The mining factor like the equipment size, geological condition and productivity cycle are combined and considered to get the optimum span value in a variety of rock mass at Antam Underground Gold Mine. The output of the research is the maximum unsupported span value has a variety figure from 1.8 to 8 meters depending on the rock mass characteristic. By observing the mining operation factor, the maximum span can be proposed in 4.2-meter length. Although the drilling time getting longer 20%, the production tonnage increase 40% which mean productivity also climb 20%. As a result, by utilize MUS and considering the mining factor, the productivity can be enhanced and safety guaranteed.

Keywords
Maximum Unsupported Span, Q-System, Underground Gold Mining

Topic
Mining and Metallurgy Engineering

Link: https://ifory.id/abstract/xFD7n4a8RgGw

Corresponding Author
Mau Lina

Institutions
a) University of Lampung, Lampung
*maulln197[at]gmail.com
b) Marine Geological Institute, Bandung

Abstract
Petrophysical analysis of well log data have been crucial for determination of reservoir prospect zone with lithology and hydrocarbon types based on petrophysical parameters. In addition, sensitivity analysis is carried out to determine elastic parameters that are sensitive of lithology variability and pore-fluid type. Based on the crossplot results, parameters such as Lambda-Rho, Mu-Rho, and VpVs ratio can detect lithology and pore-fluid types because they are sensitive to porosity and rock matrix characteristics. This study focuses on reservoir characterization of ‘MS- well on Late-Miocene N17 rock formation which was classified as a shelf carbonate matrix. The petrophysical parameters are carried out such as porosity ( ), water saturation (Sw), shale content (Vshale), and formation water resistivity (Rw) using density and neutron logs calculation, Indonesian-s equation, and qualitative analysis approcach. Based on the results of petrophysical analysis it is known that the reservoir zone is at 5003-5297 ft with total thickness 101 ft netpay. The reservoir has a limestone lithology with Gamma Ray-s value between 15-55 API. The hydrocarbon prospect zone is indicated by the separation of NPHI and RHOB curves with low value, porosity 18.5%, water saturation 37%, and water resistivity shows 0.12-0.13. The reservoir zone is indicated by the cut-off of Lambda-Rho <25 GPa*gr/cc, Mu-Rho <70 GPa*gr/cc, and VpVs ratio <2. Finally, both the petrophysical and sensitivity analysis show indication of fresh water biogenic gas reservoir.

Keywords
petrophysical and sensitivity analysis; reservoir characterization; lithology; carbonate; Nias basin

Topic
Geophysics,Geomatics and Geochemistry

Link: https://ifory.id/abstract/U7TQP3qapHjM

Corresponding Author
Eni Muryani

Institutions
a) Universitas Pembangunan Nasional Veteran Yogyakarta,
b) Universitas Pembangunan Nasional Veteran Yogyakarta,
c) Universitas Pembangunan Nasional Veteran Yogyakarta

Abstract
Cinangka Village has been the center of the accu smelting industry since 1980. This has resulted in soil contamination. The purpose of this study is Analyzing the effectiveness of Ornamental plant (Cordyline fruicosa) and Land cress (Ipomea reptans Poir) in reducing Pb on the soil. The method used for sampling is purposive sampling. The parameters tested were total Pb in soil and % Pb in plants also the dry weight of the plants. The effectiveness of the plants is known by calculating the difference of total Pb in soil with total Pb absorbed from plants divided with total Pb in soil and multiplied it with 100%. The experiment were using Ornamental plant (Cordyline fruicosa) and Land cress (Ipomea reptans Poir) within 24 and 36 days to remediate the soil with 157,82 ppm and 10032,84 ppm Pb. The highest level effectiveness of lead phytoremediation with plants was with Land cress with an average of 0,994% within 24 days of Pb polluted soil of 157.82 ppm. The effectiveness of lead phytoremediation with the lowest plants was Ornamental plant with an average of 0.945% within 36 days in Pb polluted soil of 10032,84 ppm. The Effectiveness of phytoremediation treatment with Orrnamental plant and Land cress in one harvesting is not effective (Less than 1%) in reducing lead concentration in the soil.

Keywords
Accu; Land cress (Ipomea reptans Poir); Ornamental plant (Cordyline fruicosa); Phytoremediation; Plumbum (Pb)

Topic
Disaster Management and Environmental Issues

Link: https://ifory.id/abstract/TFvKXbf6YWRg

Corresponding Author
Dewi Asmorowati

Institutions
Petroleum Engginering Departmen, Faculty of Mineral Technologi, UPN “Veteran” Yogyakarta

Abstract
The free water table is located at the base of a hydrocarbon column and the transition zone. The free water table indicate the fluid contacts which are critical for field reserve estimates and for field development. Estimation of free water table usually using capillary pressure versus water saturation graph from SCAL data, but in this case the free water level is estimated by logging data with Pickett-s plot method. This technique use petrophysical parameters on log-log graph of porosity versus resistivity to determine reservoir characterization, one of this is height above free water table. The advantages of this method are low cost accurate in simple lithologies and unreliable in complex lithologies or low resistivity sands. The Pickett-s plot method is determined by predicting petrophysical parameters (a, m, n) and formation water resistivity (Rw) first. Next, the determination of straight line water saturation (Sw), permeability (k), capillary pressure (Pc), and height above free water table (h). The study takes data from 2 wells (Y-1 and Y-2 ) on the Petro field Pematang formation. From the calculation, the height above free water table of Well Y-1 upper formation is about 88.5-1150.4 m and lower formation is about 159.3 – 973.5 m, Well Y-2 is about 265.5 – 1327.4 m.

Keywords
pickett-s plot, free water level, resistivity

Topic
Petroleum and Geothermal Engineering

Link: https://ifory.id/abstract/E3rLeRUGBcWM

Corresponding Author
Sylvianopa Magdalena

Institutions
1 Lecturer of Mining Engineering of Universitas Pembangunan Nasional Veteran Yogyakarta, Indonesia Jalan SWK 104, Sleman, 55283, Indonesia
2 Student of Magister Mining Engineering of Universitas Pembangunan Nasional Veteran Yogyakarta, Indonesia Jalan SWK 104, Sleman, 55283, Indonesia
3 Dewatering Engineer, PT Darma Henwa, Bengalon, Indonesia

Abstract
Althought it has often been done, the mine drainage system can be complicated process, depends on the condition of the location and the excavation requirements with the purpose that the water entering the mine does not interfere with mining activities. In this paper discussed the costs that are of concern in mine water management case study at Pit B, PT Darma Henwa Bengalon site in 2019, using the variable costing method. From the research results, the cost of contruction an open channel with geometry top width (B): 5,17 m, under width (b): 2,6 m, hydraulic mean depth (h): 2,24 m, sloping width (a): 2,57 m, which is Rp 36.808.096,-, making sump Panel 1, sump Panel 2 and 4, sump Panel 3 using PC1250 and HD465 are Rp 3.920.833.504,-, then the costs for investment, installation pipes and pumps, as well as operating costs at the beginning of dewatering are Rp 63.426.709.502,-. The costs of a mine drainage system in the form of the costs of making open channels, contruction of sumps and pumping costs consist of components in the form of employee salaries, assets equipment costs like pumps, material costs in this case the materials used in the istallation of pumping circuits such as pipes, bolts and flanges. Operating costs in the form of fuel and lubricants which are used, lastly the indirect cost company incurred by the direct cost. Indirect costs are available when purchasing pumps unit or assets. It usually form in percentage and consist of material costs, salaries, equipment cost and operating cost.

Keywords
open channel, sump, pumping, dewatering cost, variable cost

Topic
Mining and Metallurgy Engineering

Link: https://ifory.id/abstract/RzxEJ9PKwvHX

Corresponding Author
Rakhmat Fakhruddin

Institutions
Centre for Geological Survey, Geological Agency, Ministry of Energy and Mineral Resources, Jl. Diponegoro No. 57 Bandung, Jawa Barat, Indonesia

Abstract
Relatively few Pre-Tertiary outcrop examples have been described in the literature. Pre-Tertiary rocks outcrop at these islands is hardly found due to high levels of weathering and dense vegetation. This area needs a further geological works because this is one of the few area near offshore of Arafura sea where we can get Pre-Tertiary rocks outcrop analog for subsurface interpretation. The main objective of this paper is to recognize the stratigraphic successions of the Pre-Tertiary sedimentary rocks exposed in the study area based on their lithological characteristic and palynological ages. The methods used are geological fieldwork and palynological analysis for samples obtained. Four lithostratigraphic units are recognized from the outcrops: 1) Upper Triassic (Rhaetian to Carnian) limestone, sandstones, and claystone of Wotar Formation with depositional environment ranging from marginal marine to deep water environment, 2) Lower Jurassic (Toarcian to Hettangian) sandstones and claystone of Selu Formation, the unit was deposited at shallow marine with tide influenced environment, 3) Upper Jurassic (Tithonian) to Lower Cretaceous (Barrimian) red and brown claystone and siltstone of Arumit Formation, which was deposited in tidal environment, and 4) Lower Cretaceous (Aptian) to Upper Cretaceous (Maastrichtian) sandstone of Ungar Formation, which was deposited in foreshore, shoreface to marine offshore environment. Middle to Upper Jurassic rock unit was not found at the studied area. This time interval is probably represented by the clay dominated matrix of mud volcano (Bubuan Mud Complex).

Keywords
Pre-Tertiary, Tanimbar, Wotar, Selu, Arumit, Ungar, Bubuan Mud

Topic
Geology

Link: https://ifory.id/abstract/4cMUCydY3DhG

Corresponding Author
Nurul Magfirah

Institutions
(a) Master Student of Mining Engineering, Faculty of Mining and Petroleum Engineering, Institute of Technology Bandung
Jalan Ganesha 10, Bandung 40132, Indonesia
*nurulmage17[at]yahoo.com
(b) Earth Resources Exploration Research Group, Faculty of Mining and Petroleum Engineering, Institute of Technology Bandung
Jalan Ganesha 10, Bandung 40132, Indonesia

Abstract
This paper reviews our study aimed at identifying hydrothermal alterations to surface minerals as a result of volcanic activity at the Wayang Windu geothermal field, which is in a southern volcanic complex on the island of Java. The characteristics of hydrothermal alterations in Wayang Windu are related to surface manifestations. The geologic conditions are that it lies within andesitic, volcanic highlands formed by a concentration of volcanic centers in this part of the Sunda Arc. The geothermal manifestations are related to faults that are affected by volcanic activity, and the geothermal area is characterized by zones of intensive surface alteration at fumaroles and hot springs. There were 17 soil samples collected during a field survey and then analyzed in the laboratory using primarily X-ray diffraction (XRD). The results show that the alteration mineral assemblages observed are strongly associated with surface manifestation intensity. The presence of silica, kaolinite, halloysite, and alunite minerals identified the location as part of an advanced argillic alteration zone in the surface area.

Keywords
Surface alteration, geothermal, manifestations

Topic
Geology

Link: https://ifory.id/abstract/wY2JqvQeV6Pj

Corresponding Author
Dr. Donatus Setyawan PH, S.Si., M.Si Purwo Handoko

Institutions
FMIPA
Jurusan Kimia
Universitas Jember
Jl. Kalimantan 37 Jember

Abstract
PREPARATION, MODIFICATION AND CHARACTERIZATION CATALYST Ni/ZSiA ABSTRACT Modification and characterization of the catalyst Ni / ZSiA are prepared from natural zeolite have been carried out. ZSiA catalyst was prepared by washing zeolite with aquadest, followed by dipping in HCl 2M solution, adding Na2SiO3 5% b/b, dipping in NH4Cl 2M, calcination at 500 oC under nitrogen with flow rate of 20 mL/min for 2 hours, oxydation under oxygen flow rate of 20 mL/min and impregnation of Ni metal into catalyst surface using Ni(NO3)2&

Keywords
zeolite, Si / Al ratio, acidity, pore

Topic
Mining and Metallurgy Engineering

Link: https://ifory.id/abstract/FUjapXNJV84Y

Corresponding Author
Suherman Dwi Nuryana

Institutions
Department of Geological Engineering, Faculty of Earth Technology and Energy, Trisakti University

Abstract
Mining is a rapid process of topographical change, the former sand mining area is a complex problem between the legal aspects of land ownership, environment, geohydrology, technology and socio-economic. The former sand mining area is quite extensive in the area along the Cisadane River which includes Tangerang Regency and Bogor Regency, for proper management of the area, a study needs to be carried out in the form of identifying the condition of the former sand mining quarry. This study aims to identify ex-mine pit and the complexity of problems in the management plan of the former sand mining area. This study was carried out only by evaluating published map maps and field observations from aspects of geology, geohydrology and environment. In the study area there were 112 holes in the sand excavation hole, 57 in the Bogor district and 55 holes in the Tangerang Regency with a range of 0.9 to 9.4 ha. The former sand hole is always filled with water so it becomes a lake or it is never dry because this mining exploits sand in the form of aquifer sand. From the existing holes there is no one who reclaims according to good and correct mining rules. Utilization of former excavation holes is relatively not optimal, only 1 is used as a source of rural clean water. Mapping of former sand mining areas is absolutely necessary for sustainable planning and management of environmentally sound management.

Keywords
Mining, Sand mining, Cisadane, Tangerang

Topic
Disaster Management and Environmental Issues

Link: https://ifory.id/abstract/HdbpM48LvWGY

Corresponding Author
edgie yuda

Institutions
Universitas Pembangunan Nasional "Veteran" Yogyakarta

Abstract
The production method of MEZ-1, MEZ-2 and MEZ-3 wells produce is a natural flow. However, during the fluid production process from the reservoir to the surface on the oil field, the production rate is decline because of the decrease in reservoir pressure. The decrease in the production rate was due to the bottom hole pressure not being able to lift the production fluid to the surface. Another factor is due to the influence of the production fluid phases which is flowed to the surface, which will affect the rate of oil production obtained. Therefore, optimization is needed to increase the rate of production in these wells. Production optimization conducted by changing the production method using artificial lifts. In optimizing production, the thing that needs to be considered is screening criteria from the artificial lift that is in accordance with the condition of the wells. The first thing to do in optimizing production is collecting and validating field data, then identifying reservoir types and behavior. Therefore, determine the formation of productivity, namely productivity index and inflow performance relationship (IPR). Calculating the MEZ-1 and MEZ-3 wells IPR using the Pseudo Steady State Method and the MEZ-2 well using the Vogel Method. Furthermore, calculating the existing wells and determining the desired production rate, then screening the criteria for the lifting method. The replacement of production methods on the "MEZ" field is carried out by artificial lift methods, namely Electric Submersible Pump (ESP). The selection of artificial lift methods will be used by looking at the screening criteria of each artificial lift method that is in accordance with the well condition on the "MEZ" field and found that in the "MEZ" field well the production method replacement optimization is carried out using ESP. According to ESP artificial lift method criteria are ESP can be operated at a high rate, high GOR, good in deviated wells. ESP planning on the "MEZ" field considering the amount of free gas produced, other than that calculating the sensitivity of pump intake pressure to various prices of production rates and Turpin values to determine the price of the optimum production rate for each well.

Keywords
production optimization; artificial lift, electric submersible pump

Topic
Petroleum and Geothermal Engineering

Link: https://ifory.id/abstract/aVzF4gEDUT8w

Corresponding Author
M.Th. Kristiati

Institutions
Department of Petroleum Engineering, Universitas Pembangunan Nasional “Veteran” Yogyakarta

Abstract
The RYU Geothermal Field has 6 production wells, is a liquid dominated reservoir, the most common problem is silica scaling and flow patterns that can cause vibrations in the piping system so that it can potentially damage equipment. The effort to overcome this problem is to determine the production rate at the right well pressure. Evaluation of wellhead pressure focuses on the wellhead by considering the potential of silica scale based on the value of the SSI and the pattern of annular flow or wispy annular flow in the wellhead pressure conditions to prevent the effects of water hammer and electric power (MWe) that can be generated. The SSI (Silica Saturation Index) value is obtained from the output curve of the total mass rate and enthalpy with salinity correction, plot the flow pattern map with the Hewitt-Roberts model, while the potential electric power from the steam coming out of the separator using a 1 MWe correlation requires 8.2 tons / hour average vapor mass and separator pressure of 10.4115 barg or 11.2115 bar abs. The results showed that the wellhead pressure was 520-580 psig SSI value between 0.6291 - 0.6999, so there was no tendency to form silica scaling in the wellhead because the wellhead SSI value was below 1. According to the results of the Hewitt-Roberts Graph plot, under conditions wellhead pressure 520-580 psig forms an annular flow pattern or wispy annular flow at the wellhead so it does not cause problems. At wellhead pressure 520-580 psig has a potential between 7.65 MWe to 12.25 MWe at the pressure of separator 10.4115 barg or 11.2115 bar abs.

Keywords
Well head, SSI, flow pattern, electric power

Topic
Petroleum and Geothermal Engineering

Link: https://ifory.id/abstract/Tm7y6DMnWkvz

Corresponding Author
Joko Pamungkas

Institutions
Department of Petroleum Engineering, Faculty of Mineral Technology, UPN Veteran Yogyakarta, Jalan SWK 104 (Lingkar Utara), Condong Catur, 55283, Yogyakarta, Indonesia

Abstract
Layer A on the X field has been produced since September 2007 until December 2016. This layer consists of 9 wells with current status: 1 production well (natural flow), 5 shut-in wells, and 3 dry-hole wells. The original oil in place of this layer is 28.113 MMSTB. The production data shows that oil cumulative production of this layer is 1.066 MMSTB, which means that the current recovery factor is 3.79 %. This number is very small, and since there is a lot of hydrocarbon area that have not been produced, an integrated reservoir simulation study is done to determine the optimum scenario for this layer development. The study begins with data collecting and processing; model validation through initialization, history matching and PI matching; remaining reserve determination; and simulation of field development scenarios. There are 5 scenarios simulated and until January 2043; Base Case (production of 1 existing well) gives 2.53 MMSTB or 9 % RF; Scenario 1 (Base Case + 3 gas lift wells) gives 3.15 MMSTB or 11.21 % RF; Scenario 2 (Scenario 1 + 3 development wells) gives 6.49 MMSTB or 23.09 % RF; Scenario 3 (Scenario 1 + 6 development wells) gives 7.68 MMSTB or 27.32 % RF; and Scenario 4 (Scenario 1 + 9 development wells) gives 7.58 or 26.97 % RF. From the reservoir simulation result, the optimum development scenario for this layer is Scenario 3.

Keywords
reservoir simulation; field development; optimum scenario

Topic
Petroleum and Geothermal Engineering

Link: https://ifory.id/abstract/tNAvK4w6xrRm

Corresponding Author
Diah Rini Ratnaningsih

Institutions
1) Pertamina
2) UPN Veteran Yogyakarta

Abstract
ABAB Field is one of the fields operated by the Pertamina-EP Adera Business Unit located in South Sumatra. Found in 1951 and developed with a total of 137 wells with 8 productive reservoirs. As long as it is produced until now, in general, the category is still primary recovery, which is producing with natural energy capabilities from the reservoir. Although there is a small percentage of random water or peripheral water flooding. This is only intended for water disposal and at the same time to help maintain reservoir pressure. Reservoir that has been carried out by water injection is a reservoir of "A". This is because the driving mechanism in zone A is the drive depletion so that the reservoir pressure decreases quite rapidly and the lens shape is reservoir. The thickness of the average reservoir rate "A" is 20 ft. The "A" zone is a sand reservoir from Talang Akar, has OOIP = 52,823 MMSTB. Cumulative production until 12/14/2012 = 15,955 MMSTB (RF = 30%). One of the wells that was used as an injection well with the aim of pressure maintenance is the ABB-082 well. The ABB-082 well was drilled in 1974 and produced from the reservoir "A". Because the swap results are not indicative of oil (oil) and from the results of the survey the pressure gradient is interpreted as a water gradient of 0.41 psi / ft, in 1975 the well was converted to injection wells. Structurally the position of ABB-082 is higher (up dip) compared to the surrounding wells with a conical reservoir. In 1990 the well was no longer an injection well with shut-in status. In 2004 the ABB-082 well blew out by removing gas after shutting down for approximately 14 years. The average gas production amounted to 0.15 MMSCFD for 1 year, from 2004 to 2005 and then producing oil in natural bursts with an average production rate of 200 BOPD for approximately 2 years, from 2005 to 2007. Until now This ABB-082 cumulative production is Np = 290,356 MSTB. Well base with OOIP = 280,666 MSTB, then RF = 35% is calculated. From the description of the data, the ABB-082 well is a phenomenon of injection huff & puff with water injection (water flooding).

Keywords
Huff & Puff, Water Injection

Topic
Petroleum and Geothermal Engineering

Link: https://ifory.id/abstract/AHDyhfErvXak

Corresponding Author
Lia Yunita

Institutions
Proklamasi 45 University

Abstract
Drilling fluid (mud) is an important factor in drilling. Geothermal reservoirs are often found in local and regional faults which result in large permeability so that it often results in lost circulation during the drilling process. To prevent this, the hydrostatic pressure of the drilling fluid must be as small as possible compared to the formation pressure by adding additives. Addition of natural ingredients as additives has advantages compared to chemicals which are affordable, easily available and abundant and environmentally friendly. The research method uses laboratory studies with basic ingredients of water and bentonite and the addition of natural ingredients additives. The independent variable of banana midribs is 5 grams and 10 grams at temperatures of 80 0F, 150 0F and 300 0F. The dependent variables are density, viscosity, plastic viscosity, gel strength, yield point, mud cake and filtration loss. The results showed that the best natural additives to resolve lost circulation.

Keywords
Mud Rheology, Natural Additives, Lost Circulation.

Topic
Petroleum and Geothermal Engineering

Link: https://ifory.id/abstract/RXAxQVdgC689

Corresponding Author
Nendra Mulia Razak

Institutions
a. PT Pertamina Hulu Energi Siak
b. UPN "Veteran" Yogyakarta

Abstract
The background of this paper started from a massive MS and MK drilling campaign challenge in order to achieve contingent resources (2 C) and accelerate oil recovery. Besides that, those 2 (two) company are different entities with 384 km distance and heavy road terrain. Because of those challenges, required optimum rig capacity calculation and its scenario (use single rig/ without any replacement in completion phase or use double rig/ doing rig replacement in completion phase). To ensure rig calculation capacity has been aligned with field conditions and cost-efficiency principle, calculations was described both in technical and cost aspect. In technical aspect, there will be explained horsepower calculation based on well configuration. In cost aspect, there will be explained total cost comparison between usage of a single rig (drilling rig only) and a double rig (drilling & completion rig). Based on technical and cost calculation, concluded that the optimum rig capacity for doing drilling campaign is 427 HP with single rig usage (without rig replacement). Those things supported by ± 3.9 billion rupiahs cost-efficiency or 16% lower than double rig usage (using rig replacement for completion phase), and significant operation advantages by reducing duplicated work. Keywords: Massive Drilling Campaign, Rig Capacity Calculation, Cost-Efficiency, and Optimum Rig Capacity

Keywords
Massive Drilling Campaign, Rig Capacity Calculation, Cost Efficiency and Optimum Rig Capacity

Topic
Petroleum and Geothermal Engineering

Link: https://ifory.id/abstract/hAXmYgq47u2E

Corresponding Author
Aldin Ardian

Institutions
a) McGill University, department of mining and materials engineering, 3450 rue University, Montreal, Quebec H3A 0E8, Canada.
*aldin.ardian[at]mail.mcgill.ca
b) Universitas Pembangunan Nasional "Veteran" Yogyakarta, department of mining engineering, jalan Ring Road Utara, Yogyakarta 55283, Indonesia.

Abstract
Mining industries face uncertainties over time, including in the gold mining. The uncertainty in the gold mining project is most likely due to the financial risk (i.e., prices). The gold price fluctuation in the industry may shape the industry characteristic, either risky or not. Moreover, the gold prices are hard to predict, decision makers are suggested to quantify the project risk in advance. In this paper, the risk is quantified by correlation analysis, Copula method. Copula is a powerful tool to describe not only linear, but also non-linear correlation between random variables. In addition, the Monte-Carlo simulation – a popular and standard approach to assess the risk – is incorporated in the Copula. This approach is straightforward, fast, and applicable for different project or country. A case study is performed to make the approach more clear.

Keywords
Risk assessment, risk quantification, uncertainty, copula, mining industry

Topic
Mining and Metallurgy Engineering

Link: https://ifory.id/abstract/2qQKw6JyA9LW

Corresponding Author
Muhammad Rahman Yulianto

Institutions
UPN "Veteran" Yogyakarta

Abstract
The stability of rock slopes is important for the safety of personnel and equipment in the open pit mine. Slope instability and failure occur due to many factors such as adverse slope geometry, geological discontinuities, weak or weathered slope material due to weather influences. External loads such as high rainfall and seismicity could play an important role in slope failure. For this reason, a precise classification of rock mass is needed for the basis of determining technical policy. Rock slopes in open pit coal mining areas, especially in Indonesia, are characterized by applying various rock mass classification systems, such as Rock Mass Rating (RMR) and Geological Strength Index (GSI), because the study area comprises well exposed rock formations. In the RMR system, there are five main parameters viz. Uniaxial Compressive Strength (UCS) of rocks, Rock Quality Designation (RQD), spacing of discontinuity, discontinuity conditions, and groundwater conditions were considered. In this paper, several rock mass classification systems developed for the assessment of rock slope stability were evaluated with the condition of rock slopes in the tropics, especially Indonesian region, particularly in sedimentary rocks in the open pit coal mining area in order to get the corrected GSI equation used to characterize rock slopes based on quantitative analysis of rock mass structure and surface conditions of discontinuities

Keywords
Sedimentary Rock ,Rock Mass Rating, Geological Strength Index

Topic
Mining and Metallurgy Engineering

Link: https://ifory.id/abstract/2Aj9ayqTt4ge

Corresponding Author
Sudarmanto Sudarmanto

Institutions
Students of the UPN "Veteran" Disaster Management Master Program in Yogyakarta

Abstract
An eruption of Mount Kelud dated February 13, 2014 at 2 2. 5 0 WIB spewed 150 million cubic meters of material, which is said to be the largest eruption history since the last 100 years, in fact did not result in casualties, in three affected districts (Blitar, Kediri, Malang). Even though at that time the transition status from PVMBG occurred relatively short (less than one month). Based on information from the Center for Volcanology and Geological Disaster Mitigation (PVMBG), an increase in seismic activity was observed since January 2014, which was dominated by Shallow Volcanic (VB) and Deep Volcanic (VA) earthquakes. Based on seismic activity, the status of the Kelud volcano was then raised from normal to vigilant on February 2, 2014 , although the situation was considered to be less than ideal in rescuing, but the community was able to evacuate independently quickly at the right time and to the right location. In fact there were no fatalities or zero victim in the 2014 eruption incident. This study was designed to determine the role of Kelud Kelangkar Community in building the resilience of the people living in the vicinity of Kelud Volcano (Blitar Regency, Kediri Regency, and Malang Regency), in the phase, pre and post eruption of the Kelud Volcano in 2014 . The type of research used is descriptive research with a qualitative approach. A qualitative approach is a research procedure that produces descriptive data in the form of words written or spoken of - people and behaviors that can be observed. The object of the research was conducted at the Kelud Anchor Community in the Kelud Volcano area (Blitar, Kediri and Malang Regencies). Communities have been selected at the time of the eruption of Kelud Volcano T a hun 2014, were able to participate in community mobilization inside Kelud Volcano KRB and has been able to menyiapsiagakan themselves in the face of Gungungapi Kelud eruption, as well as the survivors were able to evacuate independently In this research, an in-depth description is obtained resilience of people living around Mount Kelud (Blitar Regency, Kediri Regency, and Malang Regency) in the face of the potential threat of the Mount Kelud Eruption disaster , and the Kelud Anchor Community Community in building the resilience of people living around Mount Kelud (Blitar Regency, Kediri Regency, and Malang Regency), pre and after the eruption of Mount Kelud in 2014

Keywords
Community Resilience around Kelud Volcan

Topic
Disaster Management and Environmental Issues

Link: https://ifory.id/abstract/3RpL9ME4uJTH

Corresponding Author
Diah Rini Ratnaningsih

Institutions
Petroleum Engineering Magister Universitas Pembangunan Nasional “Veteran” Yogyakarta

Abstract
The problem of sand production is often found in oil fields from the layers of sandstone (rock sand) that are productive in shallow depths to deep ones. Sand production begins to occur if stress exceeds the strength of rock formations, the strength of these rock formations which is the strength of natural cementation of rocks in relation to granules of sandstone in formation. In addition, sand production is very sensitive to the rate of production, where at the critical production level, sand will be produced. In sandstone formations, cement granules cementing material is not consolidated, so that the sand will be produced starting from the beginning of the oil well being completed. Sandstone formations may not produce sand at the beginning of production, but after a certain production period sand begins. It can be understood that with decreasing reservoir pressure, each sand grain will increase the over burden pressure which then results in increased stress between the grains to exceed the ability of cementing material in the sandstone formation. Sand problems in oil production wells can greatly lead to shut down of production and the increased frequency of using Rig Services in intervention well activities, which caused increasing operational costs. One way to solve the problem is by using a Progressive Cavity Pump (PCP) where the movement of the rotor to the stator passes through the production fluid including sand that is produced to the surface so that the pump stuck problem due to the accumulation of sand can be overcome. In addition to the ability to overcome the sand, PCP provides a high level of pump efficiency reaching up to 75%.

Keywords
Unconsolidated sand, Rate Critical, Progressive Cavity Pump, Pump Efficient, pump stuck, Stress Formation, well intervention, Overburden Formation.

Topic
Petroleum and Geothermal Engineering

Link: https://ifory.id/abstract/6PqBRCDvZ3cn

Corresponding Author
Zulkarnaen Yusuf

Institutions
1 ) PT Pertamina Hulu Energi Siak, Indonesia
2) Petroleum Engineering Magister UPN “Veteran” Yogyakarta, Indonesia

Abstract
The problem of sand production is often found in oil fields from the layers of sandstone (rock sand) that are productive in shallow depths to deep ones. Sand production begins to occur if stress exceeds the strength of rock formations, the strength of these rock formations which is the strength of natural cementation of rocks in relation to granules of sandstone in formation. In addition, sand production is very sensitive to the rate of production, where at the critical production level, sand will be produced. In sandstone formations, cement granules cementing material is not consolidated, so that the sand will be produced starting from the beginning of the oil well being completed. Sandstone formations may not produce sand at the beginning of production, but after a certain production period sand begins. It can be understood that with decreasing reservoir pressure, each sand grain will increase the over burden pressure which then results in increased stress between the grains to exceed the ability of cementing material in the sandstone formation. Sand problems in oil production wells can greatly lead to shut down of production and the increased frequency of using Rig Services in intervention well activities, which caused increasing operational costs. One way to solve the problem is by using a Progressive Cavity Pump (PCP) where the movement of the rotor to the stator passes through the production fluid including sand that is produced to the surface so that the pump stuck problem due to the accumulation of sand can be overcome. In addition to the ability to overcome the sand, PCP provides a high level of pump efficiency reaching up to 75%.

Keywords
Unconsolidated sand, Rate Critical, Progressive Cavity Pump, Pump Efficient, pump stuck, Stress Formation, well intervention, Overburden Formation

Topic
Petroleum and Geothermal Engineering

Link: https://ifory.id/abstract/Kkg8BtP2h7j4

Corresponding Author
Denny Suwanda Djohor

Institutions
1, 4 Fakultas Teknologi Kebumian dan Energi, Universitas TrisaktiJakarta (11440)
denny_sd[at]trisakti.ac.id, agus_g[at]trisakti.ac.id
2,3 Fakultas Ilmu Teknologi Kebumian, Institut Teknologi Bandung (40132)
bsapiie[at]gc.itb.ac.id,emmy[at]gc.itb.ac.id,

Abstract
Detailed studies of shale characteristics as reservoirs in shale hydrocarbon unconventional systems using surface data to illustrate lithofacial and geomechanical models, have not been widely used in Indonesia. Therefore, the potential for shale as a reservoir in shale hydrocarbon systems is not well known, due to the lack of surface data and subsurface data, especially core rock data. Research on the characteristics of lithofacies shale from lower Baong Formation and the integration with the geomechanical characteristics (brittleness index), can be an initial method identifying zones that have potential as reservoirs in shale hydrocarbon systems. This research is expected to be useful for the future of oil and gas exploration in Indonesia, especially in mature sedimentary basins, thus encouraging the discovery of new reserves in Indonesia. The stages of research consists of several: collecting data from field observations, processing data and laboratory analyses, followed by analyzing data on the patterns resulting from data processing; presented in the form of track stratigraphic columns and lithofacies characteristics integrated with geomechanical data. The results of the study are as follows: a) The results of the compressive test (Sch. Hammer Test) show that the lithology found in the field shows different stress values, for siltstone and claystone showing the highest value (slightly strong rock) compared to claystone carbonate sand silt (slightly soft rock); b) Based on the results of laboratory analysis conducted, it was concluded that the characteristics of the lower Baong Formation lithology can be divided into 11 Litofasies, namely: Calc. Mud-Shale, Calc. Sandy Mudstone, Calc. Claystone and Sandy Claystone (NN5), Calc. Mudstone, Claystone and Calc. Silty Claystone (NN6) and Mud-Shale, Calc. Siltstone, Sandy Mudstone and Calc. Clay-Shale (NN7); c) The results of calculation of Brittleness Index (BI) obtained by litofasies which have the highest BI value are Sandy Claystone and Sandy Mudstone, while for litofasies that have low BI values are Claystone; d) Litofacation of Sandy Claystone and Sandy Mudstone with the highest BI value, is a zone that has the potential as a reservoir in the shale hydrocarbon system; e) this research shows that the lower Baong Formation in detail have varied lithological and geomechanical characteristics.

Keywords
reservoir, unconventional, shale hydrocarbons, lithofasies, geomechanics, Lower Baong Formation

Topic
Geology

Link: https://ifory.id/abstract/LqJjrbWd3FkP

Corresponding Author
Sari Bahagiarti Kusumayudha

Institutions
Universitas Pembangunan Nasional Veteran Yogyakarta

Abstract
The geology of Menoreh Hills is mainly developed by volcanic rocks, formed in the tertiary era, comprising Kaligesing and Dukuh formations. Overlaying these formations, there are beded limestones of Sentolo Formation, and alluvial deposits. The volcanic rocks consist of andesite pyroclastic breccia, tuffaceous breccia, and lava, as well as laharic breccia and andesite intrusion, generally subjected to quite intensive joint expansion. There are also some lateral slip faults with a general pattern of Northwest - Southeast and Northeast - Southwest. Most of the lithology especially volcanic rocks in the Menoreh Hills are undergone very extensive weathering, forming soil with a thickness of up to 5 meters. The mechanical properties of fresh volcanic rocks, described in the value of friction angle () ranges 40o – 65o, cohesion force (c) 15 kg/cm2 – 40 kg/cm2, while  of the soil ranges 3o – 24o , with c = 2.5 kg/cm2 – 8 kg/cm2. The geological setting and rock mechanical properties of the Menoreh Hills bring about specific characteristics of landslides. General characteristic of slope failures in the Menoreh Hills is involving soil or debri, saturated water conditions,  value less than 25o, slope inclination greater than 20o (36%), and soil thickness more than 3 meters. On the other hand, the model of landslides of Menoreh Hills can be grouped into three types consisting of rotational mass movement, soilslide through the boundary plane between fresh and weathered rocks, and wedges failure with joint intersections act as the sliding plane.

Keywords
landslides, engineering-geological properties, characteristics, models of slope movement

Topic
Disaster Management and Environmental Issues

Link: https://ifory.id/abstract/zLK2m4Duxdgj

Corresponding Author
Muhammad Nurjati Setiawan

Institutions
Geology Departement, Faculty of Mineral and Technology University Pembangunan National Yogyakarta
PT. Dewi Sri Sejati, Jalan Perumnas Mundu Saren, Ruko Baverly R1-R2, Caturtunggal, Sleman, Yogyakarta

Abstract
Pandawa Hil is Located in Jering Sleman Yogyakarta. It is one of Hill who formed by Diorite Intrusion (Miocene) and Intruded Claystone of Nanggulan Formation ages Eocene. In this Area will be Build a Simple Housing and That opens some of western site of Pandawa Hill. So that Expose some of Lithology in Pandawa Hill, Jering, Godean, Sleman. The Beauty of rare Outcrop in the Pandawa Hill, Jering, Godean, Sleman and Then the Authors propose that some of the Area is preserve to become Geoheritage. In this Area will be planned the Construction of Simple Housing are Integrated with Geological Turism Object. For the Supporting of the Development of Simple Housing in this area, So we arrange the Slope Stability Analysis of All the Area who cut of Slope.

Keywords
Pandawa Hill, Simple Housing, Geoheritage, Slope Stability

Topic
Geology

Link: https://ifory.id/abstract/YDpZJhXj84dR

Corresponding Author
Lilik Eko Widodo

Institutions
Research Group on Earth Resources Exploration,
Faculty of Mining and Petroleum Engineering,
Bandung Institute of Technolgy, Bandung, Indonesia

Abstract
Wet muck forms due to the accumulation of fine material and water in drawbells in a block cave mine system. It results in the potential for mud rushes or wet muck spills, which have a significant influence on safety and production. Butcher, et al (2005, 2007) stated that the wet muck contributing factors are fine materials and water; according to Widodo, et al (2018), wet muck is formed because of the contribution of five factors, namely, fine material, water, height of draw, no mucking days and rainfall. Widodo, et al (2018) focussed on the expert opinions about five wet contributing factors facilitated by fuzzy logic and resulting in the wet muck class, thereby indicating the status of the corresponding drawpoints in terms of the qualitative wet muck spill potential. With the increasing number of wet muck spill occurrences, there is an opportunity for evaluating the expert opinions on data or facts about wet muck spill evidence. In this paper, the process of wet muck class prediction is based on the views of experts, such as those illustrated by Widodo, et al (2018), and strengthened by the system-s learning / training process for wet muck spill occurrence data, which his facilitated by using an adaptive neuro–fuzzy inference system (ANFIS). What is conveyed in this paper is the development of the system presented in Widodo, et al (2018), which is based solely on the opinions of experts; moreover, it involves additional system development that can intelligently recognise the wet muck class from the data of wet muck spill events or wet muck spill history and then used to predict further wet muck spill potential.

Keywords
Block cave mine, wet muck, mud rush, wet muck spill potential, prediction, fuzzy logic, ANFIS.

Topic
Mining and Metallurgy Engineering

Link: https://ifory.id/abstract/68zJFyuqW3p7

Corresponding Author
Muhammad Athif Firasmoko

Institutions
a. Master Program on Planning and Management of Coastal Area and Watershed, Universitas Gadjah Mada Daerah Istimewa Yogyakarta 55281 Indonesia
b. Departement of Geography, Universitas Gadjah Mada
Daerah Istimewa Yogyakarta 55281 Indonesia
*arismarfai[at]ugm.ac.id

Abstract
Tides and abrasions as the impact of climate change pose serious risks to coastal communities in Brebes Regency. The coastal communities of Brebes Regency have social capital for disaster risk reduction as a form of disaster adaptation and mitigation strategies. Social capital in disaster management is an effort to improve emergency preparedness and respond to the disaster recovery and reconstruction process. The objective of this research is to analyze the social capital of coastal area societies in the effort of disaster mitigation as the result of climate change into three social capital (bonding, bridging, linking). The respondents are the societies who join disaster care association in Kaliwlingi, Sawojajar, and Karangdempel Village, Brebes Subdistrict. The research result indicates that bonding social capital of Kaliwlingi, Sawojajar, and Karangdempel Village is seen from trust, norms, knowledge, awareness, social activities numbers and routine, participation, basic facility and individual-s characteristics. However, Karangdempel and Sawojajar village has lower social activities, participation, and awareness than Kaliwlingi Village. The bridging social capital in Kaliwlingi, Sawojajar, and Karangdempel Village can be seen fromsome groups. However, Sawojajar and Kaliwlingi Village has internal problem so that it reduces the benefits of group. Linking social capital runs well in Kaliwlingi and Sawojajar village because the stakeholder moves actively. However, there is a problem which reduces linking social capital in Sawojajar and Karangdempel Village and make it nonoptimal.

Keywords
social capital, climate change, coastal area

Topic
Disaster Management and Environmental Issues

Link: https://ifory.id/abstract/69KM2BTDXhHw

Corresponding Author
Tri Nopi Yanti

Institutions
a) University of Lampung, Lampung
*trinopiyanti30[at]gmail.com
b) Marine Geological Institute, Bandung

Abstract
Comprehensive characterizarion methods are carried out to determine accurate source rock and reservoir identification. Geochemical data has become a critical part of recent unconventional exploration and development. However, due to high cost of geological core extraction and analysis, geophysical wireline logging tools have become the primary source of downhole measurement of geomechanical properties. This study covers an integrated approach at defining geochemical report derived from geological core extraction and analysis and its relationship with geophysical wireline logs of 5 (five) wells at Northeast Java Basin. Wireline logs can be used to identify reservoir and source rock intervals in the primary stage of well drilling. However, the well logs that directly measure the hidrogen content of the kerogen do no exist. Consequently, it used for source rock evaluations and calculation of Total Organic Carbon (TOC) most commonly include sonic, density, gamma ray, neutron, and resistivity. The Van Krevelen diagram has been applied to all 5 (five) wells that indicates 2 (two) of them have potential gas – kerogen type III/IV with marginally mature to mature source rock. The integration of well logs and geochemical data greatly improves the accuracy and understanding of the controls of reservoir quality and source rock. It can be used for further step of knowing basin potential and its prospect level.

Keywords
well log analysis; geochemical data; Total Organic Carbon; Northeast Java Basin

Topic
Geophysics,Geomatics and Geochemistry

Link: https://ifory.id/abstract/7umXR6aPZWK9

Corresponding Author
Muhammad Gazali Rachman

Institutions
(*) Geological Engineering Department, UPN "Veteran" Yogyakarta

Abstract
Pacitan Regency is the easternmost district of the province of East Java which is directly adjacent with the Wonogiri Regency (Central Java) to the west. Pacitan can be reached in about 4 hours from Yogyakarta by land transportation via the southern route of Java. The morphology of the pacitan district is very unique. Pacitan city is a semicircular valley flanked by high hills in the east, north, and west. The hills are dominated by rocks of ancient Oligo-Miocene volcanic products commonly called the Old Andesite Formation. Pacitan stratigraphy according to Samodra, et al (1992) from the oldest to the youngest are Oligocene Volcanic (Mandalika Formation, Watupatok Formation, and Arjosari Formation), Early Miocene Carbonate (Campurdarat Formation, Jaten Formation), Middle Miocene Volcanic (Wuni Formation), Late-pliocene miocene carbonate (Nampol Formation, Oyo Formation, Wonosari Formation), and holocene alluvial deposits (kalipucang Formation). Pacitan district is not an oil and gas producing district like other districts in North East Java because the presence of dominant volcanic rocks is not considered to be a prospect petroleum play. For this reason, we need to study the potential of the petroleum system of southern mountainous sub-volcanic deposits. This study started from Pacitan district. Jaten Formation and the Nampol Formation are interesting formations in terms of petroleum systems because they are composed of sandstone, shale, and coal intercalations that are very rich in carbon materials. In the other hand they also have the potential to be a reservoir because their physical properties such good porosity and permeability. This study uses surface data with detailed stratigraphic cross section measurements, Rock Eval Pyrolysis (REP), Reflectance of Vitrinite and Kerogen Type of selected samples to analyze the potential of Jaten and Nampol formations to become a source rock. In addition, porosity and permeability analysis was also performed using petrographic thin section analysis and lab tests.

Keywords
Pacitan, Petroleum, Reservoar, Source Rock, Jaten

Topic
Geology

Link: https://ifory.id/abstract/Y6ephVT4xzbu

Corresponding Author
Wasis Wuyung Wisnu Brata

Institutions
(a)Department of Biology, Universitas Negeri Medan, Jl. Willem Iskandar Pasar V Medan Estate, 20221, Sumatera Utara, Indonesia
*wasisbrata[at]gmail.com
(b)Department of Physics Education, Universitas Sultan Agung Tirtayasa, Jl. Raya Jakarta KM 04 Serang, Banten 14212, Indonesia

Abstract
The purpose of this study was to examine the differences in constructivist learning environments in conventional and MOOC-based STEM learning. the research method uses experimental design, with a subject of 210 students of the Faculty of Mathematics and Natural Sciences in Medan, Indonesia. Data is collected through the Constructivist Learning Environment Survey (CLES) instrument. The questionnaire consisted of 34 questions consisting of six dimensions, namely - working with ideas, personal relevance, collaboration, respect for difference, critical voice and uncertainty of science. The results showed that the learning environment in the STEM class in the two STEM class groups was not significantly different. The average level of constructivist learning environment in conventional STEM is 81.14% and 79.80% for STEM based on MOOCs. Constructivist environmental dimensions in the two STEM groups, have the same sequence of outcomes with achievement levels more than 72%. The dimension with the highest achievement is “respect for difference”-, while “working with ideas” is the lowest achievement dimension. It can be concluded that the application of STEM learning both conventionally and MOOCs has similar constructive learning environment conditions.

Keywords
STEM learning; environmental issues; MOOCs; constructivist learning environment

Topic
Disaster Management and Environmental Issues

Link: https://ifory.id/abstract/KHwVEQvNhXM9

Corresponding Author
Mingshi Gao

Institutions
School of Mines,
China University of Mining and Technology

Abstract
Rock-bursts, which are usually collapsed, caved-in, or sealed off instantaneously, cause risks to mine safety and production. Approximately 85% of rock-bursts happen in roadways when the elastic complementary energy accumulated in the rock exceeds the minimum kinetic energy associated with damage to the surrounding rock. The greater the difference between the elastic complementary energy and the minimum kinetic energy, the more likely the rock-burst is. According to the mechanism of roadway destruction by rock-bursting, a strong-soft-strong (3S) structural model to prevent rock-bursts from occurring was established and analysed. The result showed that the 3S structural model encompassed: the strength characteristics of the structure itself, stress adjustment, wave absorption, deformation and anti-deformation, energy consumption, etc. Stress criterion and energy rule for the small inner support structure destroyed by rock-bursting were deduced. Finally, based on the 3S model, the engineering application was theoretically discussed; several techniques such as decreasing shock energy, deploying adequate soft structures, and improving support strength were proposed to prevent roadway destruction by rock-bursts.

Keywords
mining engineering; rock-bursts; roadways; strong-soft-strong (3S) mechanical model; engineering applications

Topic
Mining and Metallurgy Engineering

Link: https://ifory.id/abstract/HdWcFwvbAg3M