摘要
榆树林油田主产层平均孔隙度11%,平均空气渗透率0.81~1.06 mD,为特低渗储层,经过近16年CO_(2)驱油矿场试验取得了较好效果。为了促进碳捕集、利用与封存(Carbon Capture, Utilization and Storage, CCUS)规模化应用,利用室内物理模拟实验和开发生产数据,对影响注气开发效果的混相压力、人工压裂和多层开发方面采取的应对措施进行了分析研究。结果表明:制定的“提压力、促混相”的开发方针可扩大局部混相区域和提高非混相区域混相能力,改善CO_(2)非混相驱开发效果;通过超前注气,注入量达到0.02~0.03 HCPV之后采油井再射孔投产,可以使1 mD左右特低渗储层不压裂就实现压裂井水驱开发相当的采油强度,优选压裂井、层和参数可实现油井引效、稳产和增产;多层砂岩油田开发,应以射主力层为主,先射渗透率相近且渗透率较低层,射开层数控制在2~3层,有利于减少无效注气,加强分注井管理、不断优化分注参数有利于提高分注效果。研究结果为CO_(2)非混相驱油矿场实践及相关开发策略制定提供了参考。
The average porosity and air permeability of the main production layer in Yushulin Oilfield are 11%and 0.81~1.06 mD,respectively,indicating an ultra-low permeability reservoir.Over the past 16 years,the CO_(2)flooding field tests conducted in Yushulin Oilfield have yielded satisfactory results.In order to promote the large-scale application of carbon capture,utilization,and storage(CCUS),this study uses indoor physical simulation experiments and production data analysis to analyze the countermeasures for improving gas injection development,focusing on miscible pressure,artificial fracturing,and multi-layer development.The results show that the immiscible development strategy of“increasing pressure and promoting miscibility”enhances the effectiveness of CO_(2)immiscible flooding by expanding the local miscible region and improving its miscibility capacity.Implementing advanced gas injection and commencing production after reaching an injection volume of 0.02~0.03 HCPV allows ultra-low permeability reservoirs,with a permeability as low as 1 mD,to achieve oil recovery intensity comparable to water flooding without fracturing operations.Optimizing fractured wells,layers,and parameters can lead to enhanced efficiency,stability,and increased production.Optimizing fractured wells,layers,and parameters can lead to enhanced efficiency,stability,and increased production.In multi-layer sandstone oilfield development,focusing on the main production layer,initially targeting layers with similar and lower permeability,and controlling the number of injection layers to 2~3,helps minimize ineffective gas injection.Strengthening the management of injection wells and continuously optimizing injection parameters can further improve the injection effectiveness.The results provide a reference for CO_(2)immiscible flooding practice and related development strategies.
作者
张玉伟
杨铁军
王文明
杨正明
刘莉
ZHANG Yuwei;YANG Tiejun;WANG Wenming;YANG Zhengming;LIU Li(School of Petroleum Engineering,Northeast Petroleum University,Daqing,Heilongjiang,163000,China;Yushulin Oilfield Development Company of PetroChina Daqing Oilfield Co.,Ltd.,Daqing,Heilongjiang,163000,China;PetroChina Research Institute of Petroleum Exploration&Development,Beijing,100083,China)
出处
《天然气与石油》
2024年第5期21-27,共7页
Natural Gas and Oil
基金
中国石油天然气股份有限公司攻关课题“提高采收率实验新方法与新技术研究”(2023ZZ04-01)。
关键词
CO_(2)驱油
非混相驱
混相压力
人工压裂
分层注气
CO_(2)flooding
Immiscible flooding
Miscible pressure
Artificial fracturing
Layered gas injection
