摘要
低渗透油藏具有启动压力梯度,不仅考虑其渗流特征,还考虑应力敏感地层中介质的变形,建立变形三重介质低渗透油藏双渗流动模型。引入渗透率模数表达介质变形对渗透率的影响,结合低渗透情形下的非达西运动定律,推导出裂缝、溶洞与基岩同时发生形变、裂缝和溶洞同时向井筒供液的双渗流动数学模型,并求解,根据数值结果绘制试井样板曲线,同时对油藏参数进行了敏感性分析。
A dual-percolation model of low permeability reservoir with deformed triple media has been constructed with consideration of threshold pressure gradient,flow characteristics and media deformation in the stress-sensitive formation of low permeability reservoir.Permeability modulus has been introduced to represent the effect of media deformation on permeability.A dual-percolation mathematical model is built by combining with the non-Darcy law under low permeability condition for simultaneous deformation of fractures,cave and matrix and simultaneous fluid supplying into wellbore from both fractures and cave.The model is solved and a type curve of well testing is plotted according to the numerical results.Moreover,a sensitivity analysis is conducted for reservoir parameters.
出处
《特种油气藏》
CAS
CSCD
2010年第3期73-76,共4页
Special Oil & Gas Reservoirs
基金
国家重大专项“裂缝性碳酸盐岩油藏开发关键技术”(2008ZX05014-004)
关键词
三重介质
变形
非达西渗流
低渗透油藏
井筒储集
表皮效应
试井
triple media
deformation
non-Darcy flow
low permeability reservoir
wellbore storage
skin effect
well test
