Designing Pressure Draw down Test on Heavy Oil Well
Muhammad Taufiq Fathaddin(a*), Nabilah Hisanah(b), Widia Yanti (a), R. Hari Karyadi Oetomo(a), Ilman Muhammad Azmi(c)

(a)Univeritas Trisakti, Faculty of Earth Technology and Energy, Indonesia
(b) Pertamina Hulu Energi Tuban East Java, Jakarta, Indonesia
(c) Universitas Jember, Faculty of Engineering, Indonesia
(*)muh.taufiq[at]trisakti.ac.id

Abstract

High viscosity which is an inherent property of heavy oil would give an inconclusive result on a Pressure Draw-down Test. Some kind of thermal injection should be performed prior to implementing the operation of Pressure Draw-down Test, where the heat will reduce the viscosity of the reservoir fluid. The study was aimed to design a proper Pressure Draw-down Test for N-7 Well using a simulator. Since the well test was intended to reach radial flow regime then the viscosity should be reduced from 1069 cp to 66.5 cp for production time of 500 hours or to 24.8 cp for production time of 100 hours. Sensitivity test of several parameters namely viscosity, permeability, porosity, and shut-in time was conducted to analysis the effect of the parameters on the radius of investigation and radial flow time. This sensitivity would give various radius of investigation. Furthermore, the study was continued to correlate radius of investigation as a function of the parameters mentioned above. Permeability and shut-in time are directly proportional to radius of investigation. While porosity and viscosity are inversely proportional to the radius of investigation.

Keywords: Pressure Draw Down Test, Pressure Derivative, Heavy Oil, Radius of Investigation

Topic: Petroleum and Geothermal Engineering

Link: https://ifory.id/abstract-plain/2kKqJaUFfyhb

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