塔河强底水砂岩油藏CO2驱机理实验研究  

Experiments on CO2 flooding mechanism for Tahe sandstone reservoir with strong bottom water

作　　者：刘学利[1] 郑小杰[1] 谭涛[1] 窦莲 谢爽[1] LIU Xueli;ZHENG Xiaojie;TAN Tao;DOU Lian;XIE Shuang(Sinopec Northwest Oilfield Company,Urumqi,Xinjiang 830011,China)

机构地区：[1]中国石化西北油田分公司,新疆乌鲁木齐830011

出　　处：《油气藏评价与开发》2020年第6期115-120,共6页Petroleum Reservoir Evaluation and Development

基　　金：2019年中国石化科技攻关项目“塔河油田底水砂岩油藏提高采收率技术研究”(P19026-1)。

摘　　要：针对塔河油田强底水砂岩油藏开发后期井间剩余油难动用,常规提高采收率方法不适用的难题,探索开展了强底水砂岩油藏CO2驱技术的可行性研究。利用室内实验、数值模拟和常规油藏工程相结合的方法,开展了底水砂岩油藏CO2驱机理研究,确定了塔河底水砂岩油藏CO2的最小混相压力为29.6 MPa,初步明确了CO2驱具有膨胀作用、扩大横向波及作用等主要机理。CO2在油水中的溶解分配比为4∶1左右,CO2驱可以提高采收率12.5%,明确了底水砂岩油藏CO2驱具有较好的可行性。研究结果为塔河底水砂岩油藏CO2驱先导试验提供了技术支撑。In the later development stage of strong bottom water sandstone reservoir of Tahe Oilfield,the development effect of remaining oil between wells is poor,and the conventional EOR methods is inapplicable.In order to solve these problems,the feasibility of CO2 flooding in this type of reservoir has been explored.By combining laboratory experiments,numerical simulation and conventional reservoir engineering,the CO2 flooding mechanism for sandstone reservoir with strong bottom water has been studied,and the MMP of CO2 used in Tahe sandstone reservoir with strong bottom water is determined to be 29.6 MPa,the main mechanism of CO2 flooding is preliminarily defined to be such as swelling of oil and expansion of horizontal swept area,the dissolution and distribution ratio of CO2 in oil and water is about 4∶1,and the CO2 flooding can increase the recovery by 12.5%.All these show that CO2 flooding in Tahe sandstone reservoir with strong bottom water is feasible.The research results lay a theoretical foundation for EOR technology of this kind of reservoir and provide a scientific basis for CO2 flooding pilot test of Tahe bottom water sandstone reservoir.

关 键 词：塔河油田 强底水 砂岩油藏 CO2驱 可行性研究 

分 类 号：TE357[石油与天然气工程—油气田开发工程]