Practice of Water Injection Development in Ultra-Deep Fault-Controlled Fractured-Vuggy Reservoirs in Shunbei Oilfield

doi:10.7657/XJPG20230609

Abstract

Abstract:

The geological and development characteristics of ultra-deep fault-controlled fractured-vuggy reservoirs in Shunbei oilfield were comprehensively analyzed, and insufficient natural energy was determined to be the main reason for the rapid production decline and formation oil degassing in the weakly volatile oil reservoirs in the Shunbei No.1 fault zone. Through numerical simulation, it is clarified that water injection is the optimal development method currently. The research results show that gravity differentiation is the main mechanism of water injection in the ultra-deep fault-controlled fractured-vuggy reservoirs in Shunbei oilfield, and water injection can effectively restore formation energy. The waterflooding connectivity and energy balance capability in the fault zone’s pull-apart segments are much stronger than those in the compression segments. Water injection development of the ultra-deep fault-controlled fractured-vuggy reservoirs features rapid water channeling along fault zone and small swept area. Water injection enables good development effect, with the reservoir pressure restored by 14.78 MPa averagely, the annual decline rate of the block decreasing from 48.6% to 15.9%, and the staged cumulative oil production increased by 13.10×10⁴ tons.

Key words: Tarim basin, Shunbei oilfield, fault-controlled fractured-vuggy reservoir, natural energy, water injection, numerical simulation, mechanism, gravity differentiation

CLC Number:

TE357.6

LI Xiaobo, WEI Xuegang, LIU Xueli, ZHANG Yixiao, LI Qing. Practice of Water Injection Development in Ultra-Deep Fault-Controlled Fractured-Vuggy Reservoirs in Shunbei Oilfield[J]. Xinjiang Petroleum Geology, 2023, 44(6): 702-710.

Figures/Tables 9

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