特低渗透油田提压注水效果探讨与实践
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摘要
大庆西部外围地区特低渗透扶余油层具有埋藏深、厚度薄、砂体零散的特点,针对首次注水开发的特低渗透油田注水井吸水能力差、难以有效开发动用的实际,在搞清该区块微观特征的基础上,为确保特低渗透储层达到建立有效驱替,"注够水、注好水"的目的,经过反复理论研究和论证,提出了单井增压注水试验,现场应用后注水井能够完成配注,周围油井明显见到增油效果,实现了特低渗透储层有效驱替。利用无源微地震和同位素监测资料分析,改善了吸水状况,缓解了层间矛盾,储层动用程度得到提高。随注水压力升高降低,注水波及区范围随之升高、降低,增压注水能够有效地提高波及系数,并提高采收率,改善特低渗透油藏的开发效果,为特低渗透油田的开发提供了借鉴意义。
Ultra low permeability formations in outer area of Daqing western is characterized by deeply buried,thin,and sand scattered.Note that first waterflood in such formation where water contained capability is poor and it's difficult to recovery oil efficiently,this paper describes pilot studies of pressurized water injection on single well to ensure effective waterflood drive and achieve goal of "sufficient water injected and implementation well" on the basis of thorough theoretical study and many demonstration.After injection completion,effective waterflood drive and significant production improvement was achieved.Use of passive seismic monitoring and isotope logging has increased water contained capabilities,eased the complexity contradiction between layers,and improved reservoir effectiveness.Water injection front drive and spread area increases or decreases,following changes of pressure of water injection.Pressurized water injection can increase coefficient of water injection front drive and enhance oil recovery,improve development efficiency of ultra low permeability reservoir,it provides a reference for development of ultra low permeability oilfield.
Ultra low permeability formations in outer area of Daqing western is characterized by deeply buried,thin,and sand scattered.Note that first waterflood in such formation where water contained capability is poor and it's difficult to recovery oil efficiently,this paper describes pilot studies of pressurized water injection on single well to ensure effective waterflood drive and achieve goal of "sufficient water injected and implementation well" on the basis of thorough theoretical study and many demonstration.After injection completion,effective waterflood drive and significant production improvement was achieved.Use of passive seismic monitoring and isotope logging has increased water contained capabilities,eased the complexity contradiction between layers,and improved reservoir effectiveness.Water injection front drive and spread area increases or decreases,following changes of pressure of water injection.Pressurized water injection can increase coefficient of water injection front drive and enhance oil recovery,improve development efficiency of ultra low permeability reservoir,it provides a reference for development of ultra low permeability oilfield.
引文
[1]王文环.特低渗透油藏驱替及开采特征的影响因素[J].油气地质与采收率,2006(6):73-75.
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[3]张荣军.低渗透油藏开发早期高含水井治理技术[M].北京:石油工业出版社,2009.
[4]杨证明.低渗透油层渗流机理及其应用[M].北京:中国科学院研究生院出版社,2004.
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