中小气顶油藏“双高”阶段气顶区调整挖潜研究  

Study on adjusting and tapping potential of gas cap area in"double high"stage of medium and small gas cap reservoir

作　　者：姜永 王迪 刘洪洲 孙藏军 黄磊 JIANG Yong;WANG Di;LIU Hongzhou;SUN Cangjun;HUANG Lei(Cnooc(China)Tianjin Branch,Tianjin 300459,China)

机构地区：[1]中海石油(中国)有限公司天津分公司,天津300459

出　　处：《石油化工应用》2020年第7期10-14,共5页Petrochemical Industry Application

基　　金：国家科技重大专项“渤海油田加密调整及提高采收率油藏工程技术示范”,项目编号:2016ZX05058001。

摘　　要：气顶油藏是渤海黄河口凹陷常见的一类油气藏,该类油气藏具有典型的一砂一藏特征,单砂体储层薄,储量规模小。早期主要是采用“避气开发”、“油气同采”的开发模式。进入“双高”阶段后,随着气顶的“消失”,气顶区内水淹规律异常复杂,使得该类气顶油藏在高含水阶段后的调整挖潜面临巨大的挑战。通过“多因素耦合”的数值模拟研究,系统开展了中小气顶油藏高含水阶段气顶区内剩余油富集机理研究,形成了气顶区不同剩余油模式下调整挖潜的策略。研究结果表明:天然能量开发或注水开发(油水黏度差异小)条件下,气顶区主要发生油侵;注水开发(油水黏度差异大)条件下,气顶区主要发生水侵。气顶区油侵模式下,采用水平井靠近气顶挖潜;气顶区水侵模式下,剩余油厚度要求大于6 m^8 m,垂向位置上距气顶2 m^4 m布井,同时远离气顶低部位注水,并控制注水强度。研究成果指导渤海“双高”阶段气顶区内调整挖潜取得了较好效果,调整井初期日产油50 m3~160 m3,对类似中小气顶油藏“双高”阶段气顶区内调整挖潜具有一定的指导意义。Gas cap reservoir is a common type of reservoir in Huanghekou of Bohai Sea.This type of reservoir has typical characteristics of one sand one reservoir,single sand body reservoir is thin and reserves scale is small.In the early stage,the development mode of"avoiding gas development"and"oil and gas production"was mainly adopted.After entering the"double high"stage,with the"disappearance"of gas cap,the rule of water flooding in the gas cap area is extremely complex,which makes the adjustment and potential tapping of this kind of gas cap reservoir in the high water cut stage face a huge challenge.Through the"multi factor coupling"numerical simulation study,the mechanism of remaining oil enrichment in the gas cap area of medium and small gas cap reservoirs at high water cut stage is systematically studied,and the strategy of adjusting and tapping potential under different remaining oil modes in the gas cap area is formed.The results show that,under the condition of natural energy development or water injection development(small oil-water viscosity difference),oil invasion mainly occurs in the gas cap area.Under the condition of water injection development(large oil-water viscosity difference),water invasion mainly occurs in the gas cap area.In the mode of oil invasion in gas cap area,the horizontal well is used to tap the potential near the gas cap.In the mode of water invasion in gas cap area,the thickness of remaining oil is required to be greater than 6 m^8 m,the vertical position is 2 m^4 m away from the gas cap,the water injection is far away from the lower part of the gas cap,and the water injection intensity is controlled.The research results have achieved good results in guiding the adjustment and potential tapping in the gas cap area at the"double high"stage.The daily oil production of the adjustment well at the initial stage is 50 m3~160 m3,which has certain guiding significance for the adjustment and potential tapping in the gas cap area at the"double high"stage of similar medium and small gas cap reservoi

关 键 词：气顶油藏 水淹规律 剩余油 气顶区 调整挖潜 

分 类 号：TE34[石油与天然气工程—油气田开发工程]