考虑压敏的异常高压气藏产能校正及适用研究  

Study on Productivity Adjust and Applicability of Abnormal High Pressure Reservoirs in View of Stress Sensitive Effects

作　　者：陈玉玺 蒋利平 李华 张辉 CHEN Yuxi;JIANG Liping;LI Hua;ZHANG Hui(Zhanjiang Research Institute of CNOOC Ltd.,Zhanjiang 524057, China)

机构地区：[1]中海石油(中国)有限公司湛江分公司,广东湛江524057

出　　处：《广东石油化工学院学报》2020年第4期10-14,共5页Journal of Guangdong University of Petrochemical Technology

摘　　要：DF1-1气田中深层H1气组为异常高压低渗气藏,实验数据显示随着地层压力不断下降,储层渗透率不断变小且减小趋势及程度并不相同,其对应的直接结果可能会导致气藏产能下降,从而影响气藏的开发效果。从基础实验数据分析入手,根据渗透率随覆压变化的三种表现形式:指数式、二重乘幂函数式和幂函数式,计算出三种形式下各自渗透率变化系数,同时考虑非达西效应的影响,对基础的达西渗流二项式产能方程进行修正。通过修正后的产能方程可以定量分析压敏效应,将三种方程在DF1-1气田进行拟合,与地层实际测试结果进行对比总结出二重乘幂函数式结果更为接近,推荐二重乘幂函数式作为本气田产能分析方程,据此可更加准确地指导该类气藏的开发。The H1 zone of DF1-1 gas field is an abnormally high-pressure low-permeability gas reservoir.Experimental data show that as the formation pressure continues to decrease,the reservoir permeability will continue to decrease and the trend and degree of decrease will be different.As a result,the production capacity of the gas reservoir is reduced,which affects the development effect of the gas reservoir.Starting from the analysis of experimental data,according to the three manifestations of permeability change with overburden pressure(exponential,double power function and power function),the respective permeability change coefficients in the three forms are calculated.Considering the influence of the Darcy effect,the basic Darcy seepage binomial productivity equation is to be modified.The modified productivity equation can be used to quantitatively analyze the pressure sensitivity effect,and the three equations are fitted and applied in the DF1-1 gas field.Compared with the actual test results of the formation,it is concluded that the result of the double power function is close,and the double is recommended.The power function formula is used as the productivity analysis equation of this gas field,so that the development of this type of gas reservoir can be more accurately known.

关 键 词：异常高压 低渗气藏 压敏 产能 适用性 

分 类 号：TE37[石油与天然气工程—油气田开发工程]