基于裂缝径向流物理模型的CO_(2)驱注入方式研究  

Study on Injection Mode of CO_(2) Flooding Based on Physical Model of Fracture Radial Flow

作　　者：石立华 王维波[3] 王成俊[4] 陈龙龙 Shi Lihua;Wang Weibo;Wang Chengjun;Chen Longlong(China University of Petroleum(Beijing),Beijing 102249,China;Shaanxi Engineering Technology Research Center for Exploration and Development of Extra-Low Permeability Oil and Gas Fields,Xi′an,Shaanxi 710065,China;Shaanxi Yanchang Petroleum(Group)Co.,Ltd.,Xi′an,Shaanxi 710065,China;Xi′an Shiyou University,Xi′an,Shaanxi 710065,China)

机构地区：[1]中国石油大学(北京),北京102249 [2]陕西省特低渗透油气勘探开发工程技术研究中心,陕西西安710065 [3]陕西延长石油(集团)有限责任公司,陕西西安710065 [4]西安石油大学,陕西西安710065

出　　处：《特种油气藏》2021年第3期112-117,共6页Special Oil & Gas Reservoirs

基　　金：陕西省科技统筹创新项目“延长难采储量有效动用开发技术研究”(2016KTCL01-12)。

摘　　要：针对水驱后CO_(2)驱不同注入方式优选问题,基于裂缝径向流物理模型,开展一注四采五点法井网单一裂缝和复杂裂缝CO_(2)复合驱油室内实验,研究了低渗透裂缝性油藏水驱后不同注入工艺下CO_(2)驱效果。结果表明:单一裂缝模型水驱后,依次实施CO_(2)连续气驱、改性淀粉凝胶注入、乙二胺注入等不同注入工艺,油藏阶段采出程度呈现先增加后降低的趋势,最终可在单一水驱基础上提高采收率65.7个百分点;复杂裂缝模型水驱后,依次实施CO_(2)连续气驱、改性淀粉凝胶注入、乙二胺注入、水气交替等不同注入工艺,水气交替驱油效果最好,最终可在单一水驱基础上提高采收率28.89个百分点。研究成果对低渗透裂缝性油藏水驱后CO_(2)驱具有重要指导意义。Aiming at the optimization of different injection methods of CO_(2) flooding after water flooding,based on the physical model of fracture radial flow,indoor experiment was conducted on CO_(2) compound flooding in single fracture and complex fracture in five-spot well pattern(one well in injection and four other wells in production)to study the effect of CO_(2) flooding with different injection processes after water flooding in low-permeability fractured reservoir.The results showed that:after the water flooding of the single fracture model,different injection processes,such as continuous CO_(2) flooding,modified starch gel injection and ethylenediamine injection,were implemented successively,the recovery percent of the reservoir increased firstly and then decreased,and finally the recovery efficiency could be increased by 65.7%on the basis of the single-fracture water flooding;after water flooding of complex fracture model,different injection processes,different injection processes such as continuous CO_(2) flooding,modified starch gel injection,ethylenediamine injection and water alternate gas,were implemented successively;the effect of water alternate gas on improving CO_(2) flooding effect was the best and the recovery efficiency could be increased by 28.89%on the basis of single-fracture water flooding.The study results play a guiding role in CO_(2) flooding after water flooding in low-permeability fractured reservoirs.

关 键 词：低渗 裂缝 物理模拟 CO_(2)驱 气窜 水气交替 改性淀粉凝胶 

分 类 号：TE357[石油与天然气工程—油气田开发工程]