毛管力在低渗透油藏CO2 驱替过程中的作用

Effect of capillary pressure on CO2 displacement in low permeability oil reservoirs

黄小亮 周翔 向祖平 张丽 雷登生

HUANG Xiaoliang ZHOU Xiang XIANG Zuping ZHANG Li LEI Dengsheng

重庆科技学院石油工程学院，重庆　401331 西南石油大学石油工程学院，四川成都　610500 加拿大里贾纳大学，里贾纳　S4S0A2 长庆油田公司，陕西西安　710018

Petroleum Engineering College , Chongqing University of Science and Technology, Chongqing 401331, China Petroleum Engineering College , Southwest Petroleum University, Chengdu 610500, China University of Regina, Regina S4S0A2, Canada Changqing Oilfield Company, CNPC, Xi’an 710018, China

针对目前低渗透油藏CO2 驱替过程中，毛管力作用不确定且常被忽略问题，采用室内实验与数值模拟分析相结合的方法，研究了低渗透油藏中毛管力在CO2 驱油过程中的作用。以CO2 在不同驱油方式下长岩心室内实验为基础，建立了一维CO2 驱油的数值模拟模型，并通过模拟分析毛管压力在CO2 不同驱油方式下的作用。研究结果表明，低渗透油藏中，毛管力在CO2 不同驱油方式下所起的作用并不一致，驱替过程表现为动力，压力恢复后的驱替过程表现为阻力。因此，为促进低渗油藏合理有效开发，有效地认清毛管力在CO2 驱油中的作用是必要的。

In view of the problem that the effect of capillary pressure is uncertain and is often overlooked during CO2 displacement in low permeability reservoirs, the indoor experiment and numerical simulation analysis were combined to study the effect of capillary pressure in CO2 displacement in low permeability reservoirs. Based on long core indoor experiment under different CO2 displacement manners, a 1D numerical simulation model of CO2 flooding was built, and the effect of capillary pressure on the role of different CO2 displacement manners was analyzed through simulation. The research results show that, in low permeability reservoirs, the effect of capillary pressure in different CO2 displacement manners are not consistent. The displacement process is shown as dynamic power, but the displacement process after pressure buildup is shown as resistance. Therefore, in order to promote the reasonable and effective development of low permeability reservoirs, it is necessary to effectively identify the role of capillary pressure in CO2 flooding.

10.13639/j.odpt.2015.06.016