渗透率应力敏感效应对气水井产能的影响

Effect of permeability stress sensitivity on gas-water well productivity

冯青 刘启国 李海旭 张建 陶洪华 罗盈

西南石油大学油气藏地质及开发工程国家重点实验室，四川 成都 610500

State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu 610500, China

在许多水驱气藏中，地层流体的产出使气藏孔隙压力降低、地应力增大，导致储层渗透率、产能大幅度降低。基于岩石渗透率与有效应力之间的关系，同时考虑高速紊流惯性阻力的作用，文中建立并求解了应力敏感效应下的气水井稳定渗流产能模型，对影响气水井产能的应力敏感、气水比、高速紊流、表皮效应等因素进行了分析。研究结果表明：渗透率应力敏感效应在含水气藏中的影响不容忽视，采用考虑应力敏感效应的气水两相渗流模型，可以解释常规方法无法解释的气水井产能试井数据。

Through the study of a great number of references, output of formation fluid makes the pore pressure of gas reservoir decrease and the ground stress increase, which results in the significant reduction of reservoir permeability and productivity in many water drive gas reservoirs. Based on the relationship between formation permeability and effective stress, considering high-speed turbulent inertial resistances, this paper establishes the deliverability model of stable flow of gas-water well at stress sensitivity effect, and the factors of stress sensitivity, gas-water ratio, high-speed turbulent flow, skin effect of affecting the deliverability of gas-water well are analyzed. The results show that the effect of permeability stress sensitivity on water content gas reservoir can not be ignored, and gas-water two phases flow model considering stress sensitivity can be used to interpret the deliverability test data of gas-water well, about which some conventional methods can not interpret.

10.6056/dkyqt201301022