Development Characteristics of Solution-Gas Drive in Fault-Karst Reservoirs in Shunbei-1 Block

Abstract

Abstract: In order to confirm whether there is solution-gas drive in the fault-karst reservoirs in the Shunbei-1 block, reservoir numerical simulation was performed to characterize the solution-gas drive in the fault-karst reservoirs. Based on the reservoir engineering method, the solution-gas drive characteristics of the fault-karst reservoirs in the Shunbei-1 block were analyzed. The study shows that due to the large thickness of the fault-karst reservoirs in the study area, component gravity differentiation occurs simultaneously near the bottom of the well and at the top of the reservoir, leaving a large amount of solution-gas unproduced and forming a secondary gas cap. Under the action of the elastic energy of solution-gas, the decline of bottomhole flow pressure slows down, and the dynamic reserves of a single well increase to a certain extent. This process is accompanied by the decline in oil-phase driving index. With the further development of solution-gas drive, the secondary gas cap invades the bottom of the well, resulting in a rapid decline of oil production. Therefore, during the depletion development of the fault-karst reservoirs in the Shunbei-1 block, the solution-gas drive can be used to a certain extent together with development under pressure.

Key words: Tarim basin, Shunbei-1 block, fault-karst reservoir, solution-gas drive, secondary gas cap, reservoir engineering, numerical simulation

LIU Xueli, TAN Tao, CHEN Yong, XIE Hui, ZHU Suyang, WU Haoqiang, XIANG Dongliu. Development Characteristics of Solution-Gas Drive in Fault-Karst Reservoirs in Shunbei-1 Block[J]. Xinjiang Petroleum Geology, 2023, 44(zk(English)): 90-97.

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