注氮气对挥发性油藏流体相态特征影响实验研究  

Experimental study on the influence of nitrogen injection on the phase behavior of volatile oil reservoir

作　　者：李福堂[1] 王博[1] 辛春彦 黄亮 姜海洋 LI Futang;WANG Bo;XIN Chunyan;HUANG Liang;JIANG Haiyang(Research Institute of Petroleum Exploration&Development,Jidong Oilfield Company,PetroChina,Tangshan Hebei 063000,China)

机构地区：[1]中国石油冀东油田分公司勘探开发研究院,河北唐山063000

出　　处：《石油化工应用》2022年第2期39-43,共5页Petrochemical Industry Application

摘　　要：堡古2区块Es1油藏为典型复杂断块挥发性油藏,经过多年水驱开发,目前油藏存在地层压力低,原油脱气,综合含水高,采出程度低等问题。为了探索该类油藏水驱后注氮气提高采收率可行性,系统开展注氮气室内实验研究。通过开展注氮气油藏流体高压物性分析和细管实验,论述了注氮气对挥发性油藏流体相态特征影响。随着氮气注入量增加,地层原油的体积膨胀系数增强,地层油黏度和密度随氮气注入基本保持不变。细管实验表明注氮气后油藏采出程度增加,但不能实现混相。The Es1 reservoir in the Pugu 2 block is a typical complex fault block volatile reservoir,after years of water drive development,the current reservoir has problems such as low formation pressure,crude oil degassing,high comprehensive water cut,and low recovery.In order to explore the feasibility of nitrogen injection to increase oil recovery after water flooding in this type of reservoir,a systematic laboratory study of nitrogen injection was carried out.By carrying out high-pressure physical property analysis and slim tube experiment of nitrogen injection reservoir fluid,the influence of nitrogen injection on the phase characteristics of volatile reservoir fluid is discussed.As the amount of nitrogen injected increases,the volume expansion coefficient of the formation crude oil increases,and the viscosity and density of the formation oil remain basically unchanged with the nitrogen injection.The slim tube experiment shows that the recovery of the reservoir increases after nitrogen injection,but miscibility cannot be achieved.

关 键 词：挥发油藏 细管实验 氮气驱 复杂断块 高压物性 

分 类 号：TE346[石油与天然气工程—油气田开发工程]