Indonesia Conference Directory

Connectivity Analysis Using of Tracer or Injection-Production Wells Performance Plot In NEASD And GRH Field PHE Ogan Komering Authors : Joko Mulyono, S.T., Firman Edi, S.T., and Dr. Ir. Dyah Rini Ratnaningsih, M.T. 2)Petroleum Engineering Magister Universitas Pembangunan Nasional “Veteran” Yogyakarta, Indonesia Corresponding author: a) joko.mulyono@pertamina.com; b)firman.edi@pertamina.com c)rini_diah@yahoo.com Abstract. The Ogan Komering Working Area has an area of 1,155 km2 located in the Ogan Komering Ulu District of South Sumatra Province. The Ogan Komering Working Area is currently operated by Pertamina Hulu Energi (PHE) Ogan Komering with a Gross Split Contract Agreement as of May 20, 2018. Waterflood project has implemented since 2006 in NEASD and GRH field. Ogan Komering Block has reached second peak production with 5,980 BOPD on early 2011. Because of plugging, the injection rate nowadays is only 16,000 BWPD when once it reached 40,000 BWPD. Remaining reserves in NEASD and GRH field is 4.04 MMBO based on updating GGR study in 2019. With enhancement injection rate, NEASD and GRH field are expected to increase 2-3 MMBO reserves. The further study about waterflood subsurface condition is conducted related to connectivity between injection well and production well also the injection performance in NEASD and GRH field to complete the target. From connectivity analysis supported with geophysic and geology interpretration, waterflooding in NEASD and GRH field consists of 4 areas which are A, B, C, and D. This analysis will be one of the guideline study for mature waterflood optimization. The connectivity between injection and production wells are important thing to optimize mature waterflood project. This paper report the tracer running result on 2006 and injection-production wells performance plot to evaluate reservoir connectivity. Tracer analysis was conducted to analyze the connectivity between injection and production wells. The tracer is injected to the several injection wells and will be expected to flow to the monitor wells considered as production wells. Several type of tracers were injected into 11 injection wells on June, 23rd until 27th 2006 and September, 10th 2006. The 11 injection wells are ASDJ-27, GRH-4, ASDJ-34, GRH-10, GRH-16, GRH-7, ASDJ-41, ASDJ-36, GRH-6, ASDJ-31, dan ASDJ-33 which is located in different section area which the injection wells has pattern peripheral. The tracer were expected to flow to the monitor wells (production wells) nearly located to the corresponding injector well. In Area A, tracer 158a in the amount of 100 liters was injected to ASDJ-34 and it was detected to ASDJ-22 after 453 days. However, performance plot shows that injection rate did not affect the liquid production rate. From geology interpretation, it is confirmed that there is minor fault in 1 km which is considered as minor leaking. Tracer 140c was injected to ASDJ-31 in Area B. In the span of time 553 days, tracer 140c