东海低渗气藏特殊渗流机理数值模拟研究  

Numerical simulation of special seepage mechanism in low permeability gas reservoirs in the East China Sea

作　　者：石美雪 张春光 伍锐东 罗岐岚 王睿 闫鑫源 SHI Meixue;ZHANG Chunguang;WU Ruidong;LUO Qilan;WANG Rui;YAN Xinyuan(Shanghai Branch of CNOOC(China)Co.,Ltd.,Shanghai 200335,China)

机构地区：[1]中海石油(中国)有限公司上海分公司,上海200335

出　　处：《石油地质与工程》2024年第1期28-33,共6页Petroleum Geology and Engineering

基　　金：中国海洋石油集团有限责任公司科技项目(CNOOC-KJ 135 ZDXM 39 SH03)。

摘　　要：东海低渗气藏气水分布复杂,存在明显的非线性渗流特征及相渗时变效应,常规数值模拟方法对复杂渗流机理的表征存在局限性。针对存在问题,基于渗流机理研究完善运动方程,明确初始流体饱和度分布及渗流参数时变规律,建立考虑流体非线性渗流及时变效应的低渗气藏渗流数学模型;基于参数敏感性分析,明确特殊渗流机理对低渗气藏开发的影响。通过对典型低渗气藏东海H气田进行实际应用,检验方法的先进性。结果表明,气井动用范围及井底流压受非线性渗流影响而减小;时变效应导致气井产水量增大、稳产时间缩短。形成的数值模拟方法提高了低渗气藏的拟合精度,模拟结果符合实际气井生产动态,为后续精细开发提供了依据。Due to the complex distribution of gas and water in low permeability gas reservoirs in the East China Sea,there are obvious nonlinear seepage characteristics and time-varying effects of phase seepage,and conventional numerical simulation methods have limitations in the characterization of complex seepage mechanism.In view of the problems,the motion equation is improved based on the study of seepage mechanism,the initial fluid saturation distribution and time-varying law of seepage parameters are clarified,and the seepage mathematical model is established considering the time-varying effect of fluid nonlinear seepage.Based on parameter sensitivity analysis,the influence of special seepage mechanism on the development of low permeability gas reservoir is determined.The method is tested through the practical application of H gas field in the East China Sea.The results indicate that the range of gas well utilization and bottom hole flow pressure are reduced by the influence of nonlinear seepage.The time-varying effect leads to an increase in gas well water production and a decrease in stable production time.The numerical simulation method can improve the fitting accuracy of the low permeability gas reservoir,and the simulation results are consistent with the actual production performance of the gas well,which provides a basis for the subsequent fine development.

关 键 词：低渗气藏 非线性渗流 相渗时变 可动水 数值模拟 

分 类 号：TE319[石油与天然气工程—油气田开发工程]