裂缝-孔隙性致密砂岩液相侵入机制研究
A study of aqueous phase invasion in tight sandstone of crack-pore dual medium
唐汉林1
作者信息
- 1. 中石化胜利油田石油开发中心有限公司,山东 东营 257000
- 折叠
摘要
由于部分致密砂岩气藏具有裂缝-孔隙性双重介质特征,且致密砂岩基质孔道极其细小并具有强水润湿性,在钻完井过程中极易受到水相侵入损害.本文结合致密砂岩气藏水相侵入问题的研究现状,开展不同静水压力和不同裂缝宽度条件下的液相侵入可视化实验,从微观角度对致密砂岩裂缝内的水相侵入规律进行研究.结果表明:液相在侵入过程中主要受毛细管力、流体自身重力、毛细管壁面对流体产生的黏滞阻力以及惯性力共同作用;由于致密砂岩孔隙的空间尺度小,分子间力(主要是指流体分子与固体表面间的作用力)作用显著,黏滞阻力作用加剧,流体在流动过程中表现出非线性渗流特征.
Abstract
Tight sandstone has crack-pore dual medium features in general.In the process of drilling and com-pletion,tight sandstone gas reservoir is highly vulnerable to water invasion damage,due to the extremely small pores and strong water wettability.Based on present researches of invasion problems in tight sandstone gas res-ervoirs,visualization tests of liquid phase intrusion were conducted under different hydrostatic column pres-sure and crack width.Aqueous phase invasion in tight sandstone cracks was studied.Results showed that the liquid phase was mainly offected by the capillary force,the gravity of the fluid,the viscous resistance of the capillary wall to the fluid and the inertial force acted together.
关键词
致密砂岩/毛细管力/液相侵入/非线性渗流/渗流特征Key words
tight sandstone/capillary pressure/aqueous phase invasion/nonlinear seepage/seepage char-acteristics引用本文复制引用
出版年
2024
NETL
NSTL
维普
万方数据