脱气对致密油藏流体渗流规律影响研究进展

 致密油藏大多含有溶解气，开采压力低于泡点压力时溶解气析出，产生渗流阻力，影响产能。从致密储层孔喉结构特征入手，阐述了脱气后致密油藏流体渗流特征形成的内因，分析了油藏脱气后流体的流动特征和影响因素，对比了致密油藏和常规油藏在脱气后流体渗流特征的差异，概述了现有的研究手段及相关数学模型的研究现状，展望了脱气后致密油藏流体渗流规律研究趋势。

The effects of degassing on fluid seepage law in tight oil reservoirs

Most of the tight oil reservoirs contain dissolved gas. When the production pressure is lower than the bubble point pressure, the dissolved gas is precipitated, increasing the seepage resistance and affecting the productivity. Based on the porethroat structure characteristics of the tight reservoirs, this paper explores the internal causes of the fluid seepage characteristics of the gas-bearing tight reservoirs, analyzes the fluid flow characteristics and the influencing factors after degassing of the reservoir, and compares the performances of the tight oil reservoirs and the conventional oil reservoirs, focusing on the differences of the fluid seepage characteristics after degassing. The existing research methods are reviewed, as well as the research status of the related mathematical models. Finally, the research trend of the fluid seepage law in the gas-bearing tight reservoirs is prospected.