低渗透稀油油藏注气混相驱实验及影响因素  

Experiment and Influencing Factors of Gas Injection Mixed PhaseDrive in Low-permeability Light Oil Reservoirs

作　　者：肖志朋 张彦斌 刘森 杨胜来[2] 高雨萌 XIAO Zhipeng;ZHANG Yanbin;LIU Sen;YANG Shenglai;GAO Yumeng(Research Institute of Exploration and Development,PetroChina Tuha Oilfied Company,Hami 839009,Xinjiang,China;National Key Laboratory of Petroleum Resources and Engineering,China University of Petroleum(Beijing),Beijing 102249,China)

机构地区：[1]中国石油吐哈油田分公司勘探开发研究院,新疆哈密839009 [2]中国石油大学(北京)油气资源与工程全国重点实验室,北京102249

出　　处：《科技和产业》2024年第24期341-347,共7页Science Technology and Industry

基　　金：中国石油科技重大专项(2017E-0407)。

摘　　要：我国低渗透油藏储量丰富,低渗透油藏水驱后如何进一步提高采收率是该类油藏面临的技术挑战之一,近年来注气提高采收率技术受到国内外的普遍关注,注气混相驱理论上可达到90%以上的驱油效率,提高采收率的潜力较大。为了评价吐哈低渗透稀油油藏注气能否达到混相状态,开展室内实验研究,采用吐哈低渗透稀油油藏8个区块原油,分别注入来自不同气源的3种气体(CO_(2)、鄯乌管线气、西气东输气),测定最小混相压力(MMP),分析气驱油规律及混相的影响因素。结果表明,在现有地层压力下,吐哈稀油易与CO_(2)达到混相状态,而注入烃类气(鄯乌管线气或西气东输气)使最小混相压力升高,比CO_(2)驱MMP高10 MPa以上,不易形成混相驱。建议吐哈油田葡北区块采用注鄯乌管线气混相驱、玉果区块注西气东输气混相驱、其他区块注CO_(2)气混相驱,可达到较好的开发效果,为吐哈油田低渗稀油油藏实施注气提高采收率提供了技术支持。The reserves of low-permeability oil reservoirs in our country is abundant.How to further improve oil recovery after water flooding in low-permeability reservoirs is one of the technical challenges faced by this type of reservoir.In recent years,gas injection to improve oil recovery technology has received widespread attention both domestically and internationally.Gas injection miscible flooding can achieve oil recovery efficiency of over 90%,and has great potential to improve oil recovery.In order to evaluate whether gas injection in low-permeability light oil reservoirs in Tuha can achieve a mixed phase state,indoor experimental research was conducted.Eight blocks of crude oil in Tuha low-permeability light oil reservoirs were injected with three different gas sources(CO 2,Shanwu pipeline gas,West East Gas Pipeline gas),and the oil displacement process and minimum mixed phase pressure(MMP)were evaluated to analyze the influencing factors of mixing.The result has shown that under existing formation pressure,Tuha light oil is prone to mixing with CO 2,while injecting hydrocarbon gas(such as Shanwu pipeline gas or West East Gas Pipeline gas)increases the minimum mixing pressure(more than 10 MPa higher than pure CO 2 flooding MMP),making it difficult to form mixed phase flooding.It is suggested that the Pubei block of Tuha Oilfield adopt mixed phase drive with Shanwu pipeline gas injection,mixed phase drive with West East gas transmission gas injection in Yuguo block,and mixed phase drive with CO 2 gas injection in other blocks,which can achieve good development results.Technical support is provided for the implementation of mixed phase gas flooding in low-permeability light oil reservoirs in Tuha Oilfield.

关 键 词：低渗稀油油藏 混相气驱 细管实验 最小混相压力 组分变化 

分 类 号：TE357[石油与天然气工程—油气田开发工程]