Oil-Water Two-Phase Flow Behaviors in Fracture-Cavity Carbonate Reservoirs With Fluid-Solid Coupling

doi:10.7657/XJPG20240409

Abstract

Abstract:

To enhance the recovery of fracture-cavity carbonate reservoirs and investigate the oil-water two-phase flow behaviors under fluid-solid coupling effect, a Darcy-Stokes two-phase flow model was established based on the fluid flow patterns in different media. According to the principles of effective stress and the generalized Hooke’s law, an oil-water two-phase Darcy-Stokes coupled mathematical model suitable for fracture-cavity carbonate reservoirs was developed. Macroscopic and microscopic simulations of oil-water two-phase flows were conducted for carbonate reservoirs with and without fluid-solid coupling effect. The results show a significant difference in oil-water two-phase flow behaviors within the matrix zones of reservoirs with and without fluid-solid coupling effect, but a small difference within cavities. Water injection rate greatly influences oil-water flows in fracture-cavity carbonate reservoirs.

Key words: carbonate rock, fracture-cavity reservoir, fluid-solid coupling, oil-water two-phase flow, numerical simulation

CLC Number:

TE344

LIU Qiang, LI Jing, LI Ting, ZHENG Mingjun, XU Mengjia, WANG Xuan, WU Mingyang. Oil-Water Two-Phase Flow Behaviors in Fracture-Cavity Carbonate Reservoirs With Fluid-Solid Coupling[J]. Xinjiang Petroleum Geology, 2024, 45(4): 451-459.

Figures/Tables 9

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参数	取值	参数	取值
基质初始渗透率/mD	0.8	出口压力/MPa	80
基质初始孔隙度	0.02	水相密度/（kg·m^-3）	1 000
基质弹性模量/GPa	34	水相黏度/（mPa·s）	1
基质泊松比	0.21	油相密度/（kg·m^-3）	800
基质Biot系数	0.8	油相黏度/（mPa·s）	1.8
裂缝孔隙度	0.01	最大水平主应力/MPa	180
裂缝初始渗透率/mD	1×10⁵	最小水平主应力/MPa	150
裂缝初始开度/mm	0.2	滑移系数/（m·s^-1）	0.1
裂缝法向刚度/GPa	100	裂缝Biot系数	1
渗流耦合参数/Pa^-1	1×10^-6	注水速度/（m·s^-1）	0.1
初始地层压力/MPa	80	水相、油相相渗指数	1