低渗油藏气水交替驱参数优化研究  

Optimization of Gas and Water Alternating Flooding Parameters in Low Permeability Reservoirs

作　　者：张志鹏 马力[1] 欧阳传湘[1] 王泽乾 朱海伟 ZHANG Zhi-peng;MA Li;OUYANG Chuan-xiang;WANG Ze-qian;ZHU Hai-wei(Yangtze University,Hubei Wuhan 430100,China;CNPC Changqing Oilfield Company the Eleventh Oil Production Plant,Gansu Qingyang 744511,China)

机构地区：[1]长江大学,石油工程学院,湖北武汉430100 [2]中石油长庆油田第十一采油厂,甘肃庆阳744511

出　　处：《当代化工》2018年第7期1380-1382,1386,共4页Contemporary Chemical Industry

基　　金：高温高压CO2-原油-地层水三相相平衡溶解度规律,项目号:51404037

摘　　要：针对低渗透砂岩油藏,储层物性差,孔喉半径小,层内、层间非均质性较强,水驱控制程度低,注水见效时间缓慢等问题,采用了注CO_2气体的开发方式,但研究区块已进入高含水阶段,在用气体驱替原油的过程中,由于CO_2气体和油相两相间的粘度差异,导致了CO_2气体成指状在原油中穿过,这种粘性指进现象的存在引起了驱替前缘的不稳定,降低了波及体积效率,导致了气窜现象的发生。为了减少气窜现象的发生,应用气水交替驱转换注入方式。为了获取最佳开发效果,结合了油田开发历史以及地质资料,应用油藏数值模拟软件,研究了注CO_2对低渗透砂岩油藏开发效果的影响并对注入总量、注入周期、年注气速度、气水比等参数进行了优化。研究结果表明,最佳注入方案为:CO_2注入总量为0.6 HCPV,注入周期为180 d,年注气速度为0.07 HCPV/a,气水比为2:1。In view of the problems of low permeability sandstone reservoirs, such as poor physical properties, small pore throat radius, strong intra-layer and inter-layer heterogeneity, low degree of water-flooding control and so on, a CO2 injection method was used. But the study block has entered into the stage of high water cut, during the process of displacing crude oil by gas, due to the difference in viscosity between the two phases of CO2 gas and oil phase, CO2 gas was finger-shaped and passed through the crude oil. The existence of the phenomenon caused the instability of the displacement front and reduced the volumetric sweep efficiency, resulting in the gas channeling phenomenon. In order to reduce the occurrence of gas channeling phenomenon, gas and water alternate drive injection method was used. In order to obtain the best development results, based on the history of oilfield development and geological data, the reservoir numerical simulation software was used to study the effect of CO2 injection on the development of low permeability sandstone reservoirs. Then injection volume, injection period, injection speed, gas-water ratio and other parameters were optimized. The results showed that the best injection scheme was as follows： the total amount of CO2 injection was 0.6 HCPV, the injection period was 180 d, the annual gas injection rate was 0.07 HCPV/year and the gas-water ratio was 2： 1.

关 键 词：气窜 气水交替驱 数值模拟 参数优化 

分 类 号：TE348[石油与天然气工程—油气田开发工程]