Dynamic Model and Sensitivity Analysis of High-Pressure Water Injection for Capacity Expansion of Fractured-Vuggy Reservoirs

doi:10.7657/XJPG20240410

Abstract

Abstract:

High-pressure water injection for capacity expansion is an effective method to enhance the recovery of fractured-vuggy reservoirs. However，the injection-production process during high-pressure water injection remains unclear. In this paper，three modes of high-pressure water injection for capacity expansion were proposed. Based on a dynamic model of high-pressure water injection for capacity expansion，the impacts of sensitivity parameters on the injection-production process during high-pressure water injection were simulated. The three modes of high-pressure water injection for capacity expansion were analyzed using actual wells drilled in the fractured-vuggy reservoirs in Halahatang oilfield. The high-pressure water injection for capacity expansion conforms to three modes：far-end low-energy，flow barrier，and near-end small reservoir. All three modes can realize effective production of far-end reservoirs to improve recovery efficiency. Flow barrier mode has the optimal EOR effect. The size of the near-end reservoir affects the time at which the water-injection indicator curve inflects，and the size of the far-end reservoir influences the difficulty degree of water injection after the water-injection indicator curve inflects. The fluid exchange index in the water injection process is greater than that in the production process，which indicates that the high-pressure water injection for capacity expansion is effective. The smaller the fracture closure pressure and stress sensitivity coefficient，the earlier the water-injection indicator curve inflects，and the higher the cumulative liquid production.

Key words: Halahatang oilfield, fractured-vuggy reservoir, high-pressure water injection for capacity expansion, injection-production performance, water injection mode, sensitivity, fluid exchange index

CLC Number:

TE344

ZHANG Rujie, CHEN Lixin, YUE Ping, XIAO Yun, WANG Xia, LYU Yuan, YANG Wenming. Dynamic Model and Sensitivity Analysis of High-Pressure Water Injection for Capacity Expansion of Fractured-Vuggy Reservoirs[J]. Xinjiang Petroleum Geology, 2024, 45(4): 460-469.

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参数	取值	参数	取值
注入流量/（m³·h^-1）	15	水相黏度/（mPa·s）	1
第1套储集体储量/10⁴ m³	10	油相黏度/（mPa·s）	30
第2套储集体储量/10⁴ m³	50	应力敏感系数	0.3
第1套和第2套储集体综合压缩系数/MPa^-1	0.001 273	裂缝闭合压力/MPa	80
油相交换指数/（m³·d^-1·MPa^-1）	50	第1套储集体初始压力/MPa	55
通过裂缝储集体的水相分流率	0.5	第2套储集体初始压力/MPa	65

参数	取值	参数	取值
生产流量/（m³·h^-1）	15	水相黏度/（mPa·s）	1
第1套储集体储量/10⁴ m³	10	油相黏度/（mPa·s）	30
第2套储集体储量/10⁴ m³	50	应力敏感系数	0.3
第1套和第2套储集体综合压缩系数/MPa^-1	0.001 273	裂缝闭合压力/MPa	80
油相交换指数/（m³·d^-1·MPa^-1）	50	第1套储集体初始压力/MPa	90
通过裂缝储集体的水相分流率	0.5	第2套储集体初始压力/MPa	90