双河油区产量动态特征及低产成因分析
|
摘要
经多年开发双河油区长6油藏地层压力下降,产量持续递减,严重制约了油藏的有效开发。以Arps产量递减方法为基础对研究区产量递减规律及其递减原因进行分析研究,结果表明,双河油区长6油层组产量递减属于双曲线递减,注水量下降及供液不足是产量递减的主要原因。同时针对近年来低产低效井比例逐年增加的现状,从地质、开发等因素对低产低效井成因进行分析,针对储层物性差,天然能量较弱,注采井距偏大,注采对应率低。提出了4种相应的调整对策:整体压裂,加强注水,减小注采井距,增加注水井及注水井补孔压裂。这对于减缓油田产量递减,提高油田原油采收率,改善开发效果具有重要意义。
Chang 6 reservoir in Shuanghe oil region has been developed for many years, so its formation pressure declines, and its production continuously decreases, which seriously hampers effective development of the reservoir. In this paper, based on Arps method of production decline, the law of production decline in the study field was studied as well as the declining reason. The result shows that production decline of Chang 6 oil group of Shuanghe oil region is defined as hyperbolic decline, whose main reasons are the decline of injected water and the shortage of fluid supply. In recent years, the proportion of low-yielding and inefficient wells increased year by year. The cause of low-yielding and inefficient wells was analyzed from the aspects of geology, development process and others. Aiming at poor reservoir properties, natural energy weak, the larger injection-production well spacing and the lower injection-production corresponding rate, four kinds of corresponding adjustment countermeasures were put forward, such as overall fracturing, reducing the well spacing, strengthening water injection, reducing injection-production well spacing, increasing the injection wells and its reperforation fracture. These countermeasures have important significance for slowing down the oil field production decline, increasing the oil field recovery and improving the development effect.
Chang 6 reservoir in Shuanghe oil region has been developed for many years, so its formation pressure declines, and its production continuously decreases, which seriously hampers effective development of the reservoir. In this paper, based on Arps method of production decline, the law of production decline in the study field was studied as well as the declining reason. The result shows that production decline of Chang 6 oil group of Shuanghe oil region is defined as hyperbolic decline, whose main reasons are the decline of injected water and the shortage of fluid supply. In recent years, the proportion of low-yielding and inefficient wells increased year by year. The cause of low-yielding and inefficient wells was analyzed from the aspects of geology, development process and others. Aiming at poor reservoir properties, natural energy weak, the larger injection-production well spacing and the lower injection-production corresponding rate, four kinds of corresponding adjustment countermeasures were put forward, such as overall fracturing, reducing the well spacing, strengthening water injection, reducing injection-production well spacing, increasing the injection wells and its reperforation fracture. These countermeasures have important significance for slowing down the oil field production decline, increasing the oil field recovery and improving the development effect.
引文
[1]周红,关振良.实用油藏工程[M].武汉:中国地质大学出版社,2004:72-83.
[2]李治平,葛兰华,王常岭,等.产量递减曲线参数最优化分析方法[J].石油勘探与开发,1999,26(1):56-57.
[3]夏位荣,张占峰,程时清.油气田开发地质学[M].北京:石油工业出版社,1999:72-77.
[4]赵静,刘义坤,赵泉.低渗透油藏采液采油指数计算方法及影响因素[J].新疆石油地质,2007,28(5):601-603.
[5]孙欣华,刘永军,于锋,等.温米油田采液、采油指数变化规律[J].新疆石油地质,2007,23(1):49-51.
[6]宋冬梅,朱学谦,周琦,等.文东油田沙三中油藏储层特征对开发的影响[J].新疆石油天然气,2006,2(2):23-26.
[7]郭粉转,唐海,吕栋梁,等.低渗透油藏合理地层压力保持水平研究[J].特种油气藏,2011,18(1):90-92.
[2]李治平,葛兰华,王常岭,等.产量递减曲线参数最优化分析方法[J].石油勘探与开发,1999,26(1):56-57.
[3]夏位荣,张占峰,程时清.油气田开发地质学[M].北京:石油工业出版社,1999:72-77.
[4]赵静,刘义坤,赵泉.低渗透油藏采液采油指数计算方法及影响因素[J].新疆石油地质,2007,28(5):601-603.
[5]孙欣华,刘永军,于锋,等.温米油田采液、采油指数变化规律[J].新疆石油地质,2007,23(1):49-51.
[6]宋冬梅,朱学谦,周琦,等.文东油田沙三中油藏储层特征对开发的影响[J].新疆石油天然气,2006,2(2):23-26.
[7]郭粉转,唐海,吕栋梁,等.低渗透油藏合理地层压力保持水平研究[J].特种油气藏,2011,18(1):90-92.