致密油藏水平井不稳定渗流压力分布

Unsteady seepage flow pressure distribution in horizontal wells of tight oil reservoir

刘立峰 冉启全 王欣 路军月 袁晓红 胡建新

LIU Lifeng RAN Qiquan WANG Xin LU Junyue YUAN Xiaohong HU Jianxin

中国石油石油勘探开发研究院，北京　100083 中国石化石油勘探开发研究院，北京　100083 中国石油华北油田分公司，河北任丘　062552

Research Institute of Petroleum Exploration and Development, CNPC, Beijing 100083, China Petroleum Exploration and Production Research Institute of SINOPEC, Beijing 100083, China Huabei Oilfield Company CNPC Renqiu 062552, China

致密砂岩油藏水平井生产过程中的流体渗流过程具有明显的非达西流特征。在考虑启动压力梯度和应力敏感性的基础上，应用平均质量守恒定律和压降叠加原理推导出了致密砂岩油藏水平井的三维不稳定渗流压力分布公式。应用镜像反映理论可以得到该模型在不同边界条件下的水平井渗流过程描述和各有关参数的解，具有很强的实用性。同时，分析了启动压力梯度和应力敏感性对储集层中流体渗流的影响，给出了不同启动压力梯度和渗透率变形系数下的水平井压力分布。

Fluid seepage process in horizontal wells production of tight oil reservoir shows obvious non-Darcy flow characteristics. Based on initiating pressure gradient and stress sensitivity, law of conservation of mass and pressure drop superimposition principle were used to infer the unsteady seepage flow pressure distribution equation for horizontal wells in tight sandstone reservoirs. The characterization of the seepage flow process of horizontal wells under different boundary conditions and the solution of relevant parameters can be obtained for this model by using mirror reflection theory, which is very practical. Meanwhile, the effect of initiating pressure gradient and stress sensitivity on fluid seepage in reservoirs was analyzed, which resulted in pressure distribution in horizontal wells under different initiating pressure gradient and permeability coefficient of deformation.

10.13639/j.odpt.2014.05.016