基于Pearson相关系数的低渗透砂岩油藏重复压裂井优选方法  

Method for selecting repeated fracturing wells in low-permeability sandstone reservoirs based on Pearson correlation coefficient

作　　者：刘子军[1] LIU Zijun(Hekou Oil Production Plant,Shengli Oilfield Company,SINOPEC,Dongying City,Shandong Province,257200,China)

机构地区：[1]中国石化胜利油田分公司河口采油厂,山东东营257200

出　　处：《油气地质与采收率》2022年第2期140-144,共5页Petroleum Geology and Recovery Efficiency

基　　金：山东省自然科学基金项目“多级强脉冲压裂条件下岩石破坏损伤与裂隙扩展耦合响应机制研究”(ZR2016EEQ04)。

摘　　要：胜利油田低渗透砂岩油藏油层跨度大、层间非均质性强、储层物性差。前期压裂井普遍存在低产、低效的问题,亟需开展重复压裂。为实现科学选井,建立了一种基于Pearson相关系数的重复压裂选井方法。该方法综合考虑了储层、压裂和生产动态资料,并通过计算候选井与虚拟目标井的Pearson相关系数来定量评价候选井的重复压裂增产改造潜力。针对胜利油区大王北油田某区块的一个井组,利用建立的选井方法筛选出最具重复压裂增产改造潜力的井。采用多重暂堵压裂工艺对该井实施了重复压裂改造,压裂后日产油量从2.5 t/d提高到7.3 t/d,证实了该方法的有效性,且无需大量样本支持,不涉及复杂的计算,具有一定现场推广价值。The low-permeability sandstone reservoirs in Shengli Oilfield have many oil layers,strong interlayer heterogeneity,and poor reservoir petrophysical properties.The previously fractured wells are generally subject to low production and low efficiency,and repeated fracturing is urgently needed.For scientific well selection,a method for selecting repeated fracturing wells based on the Pearson correlation coefficient was developed.The reservoir petrophysical properties,fracturing parameters,and production data were comprehensively considered in the method,and the Pearson correlation coefficients of the candidate well and the virtual target well were calculated to quantitatively evaluate the potential of the candidate well for repeated fracturing stimulation.Aiming at a well group in Shengli Dawangbei Oilfield,the proposed well selection method was used to screen out the well with the greatest potential for repeated fracturing stimulation.Repeated fracturing was implemented on the well with multiple temporary-plugging fracturing techniques.After the fracturing,the daily oil production increases from 2.5 t/d to 7.3 t/d,which confirms the effectiveness of the method.It does not require massive samples and complex calculations and can be applied to field practices.

关 键 词：重复压裂 低渗透砂岩油藏 增产潜力 Pearson相关系数 

分 类 号：TE319[石油与天然气工程—油气田开发工程]