低渗低黏油藏CO2气水交替注入主控因素分析  

Main Controlling Factors of CO2 Gas-Water Alternating Injection in Low Permeability and Low Viscosity Oil Reservoirs

作　　者：董江艳 吴淑红[1,2] 邢国强 DONG Jiangyan;WU Shuhong;XING Guoqiang(Research Institute of Petroleum Exploration and Development,CNPC,Beijing 100083,China;State Key Laboratory of Enhanced Oil Recovery,CNPC,Beijing 100083,China)

机构地区：[1]中国石油勘探开发研究院,北京100083 [2]提高采收率国家重点实验室,北京100083

出　　处：《西安石油大学学报（自然科学版）》2019年第4期43-51,共9页Journal of Xi’an Shiyou University（Natural Science Edition）

基　　金：中国石油天然气股份有限公司科技重大专项“新一代油藏数值模拟软件(V4.0)开发”(2017A-0906);国家油气重大专项“致密油有效开发关键技术”(2016ZX05046-003)

摘　　要：针对低渗低黏油藏常规注水存在注采压差大、有效驱替压力系统难以建立、产量递减快及常规注气存在气体突破时间早、波及体积小等问题,以中东X油藏为例,利用数值模拟方法对低渗低黏油藏CO2气水交替注入开发方式进行研究,分别研究储层渗透率、原油黏度、气水比、注入速度、注入周期和注入压力等因素对低渗低黏油藏采收率的影响;基于数值模拟结果,利用灰色关联分析法确定影响CO2气水交替注入采收率的主控因素。研究结果表明:储层渗透率、原油黏度、气水比和注入速度是影响低渗低黏油藏CO2气水交替注入开发效果的主控因素,其次是注入周期和注入压力。In order to solve the problems of large injection-production pressure difference,difficult to establish effective displacement pressure system and rapid production decline in conventional water injection process of low permeability and low viscosity oil reservoirs and the problems of early gas breakthrough and small sweep volume in conventional gas injection of low permeability and low viscosity oil reservoirs,taking X reservoir in Middle East as an example,the influences of reservoir permeability,crude oil viscosity,gas-water ratio,injection rate,injection cycle and injection pressure on the recovery factor of CO2 gas-water alternating injection in low permeability and low viscosity reservoirs are studied by numerical simulation.Based on the results of numerical simulation,the main controlling factors affecting the recovery factor of CO2 gas-water alternating injection were determined by grey correlation analysis.The result shows that reservoir permeability,crude oil viscosity,gas-water ratio and injection rate are the main controlling factors affecting the development effect of CO2 gas-water alternating injection in low permeability and low viscosity reservoirs,followed by injection cycle and injection pressure.

关 键 词：低渗低黏油藏 CO2气水交替注入 采收率 主控因素 

分 类 号：TE348[石油与天然气工程—油气田开发工程]