双河油区产量动态特征及低产成因分析

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。

Analysis on Yield Dynamic Characteristics and Low-yield Causes in Shuanghe Oil Region

Chang 6 reservoir in Shuanghe oil region has been developed for many years, so its formation pressure declines, and itsproduction continuously decreases, which seriously hampers effective development of the reservoir. In this paper, based on Arpsmethod of production decline, the law of production decline in the study field was studied as well as the declining reason. The resultshows that production decline of Changg oil group of Shuanghe oil region is defined as hyperbolic decline, whose main reasons arethe decline of injected water and the shortage of fluid supply. In recent years, the proportion of low-yielding and inefficient wellsincreased year by year. The cause of low-yielding and inefficient wells was analyzed from the aspects of geology, developmentprocess and others. Aiming at poor reservoir properties, natural energy weak, the larger injection-production well spacing and thelower injection-production corresponding rate, four kinds of corresponding adjustment countermeasures were put forward, such asoverall fracturing, reducing the well spacing, strengthening water injection, reducing injection-production well spacing, increasingthe injection wells and its reperforation fracture. These countermeasures have important significance for slowing down the oil fieldproduction decline, increasing the oil field recovery and improving the development effect.