油气田注水区块再压裂方案参数设计方法  

Parameter design method for re-fracturing scheme of water injection block in oil and gas field

作　　者：孙海林 张鹏[1] 杨小涛 徐克彬 陈清 赵琦 SUN Hailin;ZHANG Peng;YANG Xiaotao;XU Kebin;CHEN Qing;ZHAO Qi(Downhole Operating Branch,CNPC Bohai Drilling Engineering Company,Renqiu,Hebei 062552,China)

机构地区：[1]中国石油集团渤海钻探工程有限公司井下作业分公司,河北任丘062552

出　　处：《油气井测试》2020年第5期6-13,共8页Well Testing

基　　金：国家重大专项“油气田及煤层气开发”子课题“储层改造关键流体研发”任务七“新型压裂液施工工艺技术及现场试验”(2017ZX05023003-007)。

摘　　要：针对低渗透油藏注水开发后,老井压裂改造需要重新确定压裂参数的问题,开展注水区块再压裂方案参数设计研究。根据注水区块特点,补充选井因素,采用经过改进的综合储层地质和生产注采因素的灰色关联度综合评价方法优选压裂井位;建立适于小样本群分析的支持向量机技模型,参考邻井施工经验数据给出各井施工参数,完成注水区块压裂施工方案编制,引入复合叠加核函数,提高预测精度。通过对压裂选井选层及施工参数推荐数学模型改进研究,形成注水区块再压裂方案参数设计方法。应用该方法,在L43断块优选出8口老井进行压裂增产改造,均顺利完成设计加砂,平均日产油量从2.1 m^3提高到7.7 m^3,压后增产显著,提高了L43断块整体产油量。油气田注水区块再压裂方案参数设计方法符合注水开发区块增产需求,选井参数全面,降低样本规模限制,对注水区块老井压裂具有指导意义。After the development with water-injection technology for low-permeability reservoirs,the fracturing parameters of old wells need to be re-determined,and the research on the parameter design of re-fracturing schemes for water injection blocks is carried out.According to the characteristics of the water injection block,using well selection factors,this paper adopts an improved comprehensive evaluation method of gray correlation degree combining comprehensive reservoir geology and production injection-production factors to optimize the position of fracturing well.In addition,through the establishment of support vector mechanism model suitable for small sample group analysis and referring to the construction experience data of adjacent wells,the construction parameters of each well are given,and the fracturing operation scheme of water injection block is compiled.The prediction accuracy is improved by introducing the composite superposition kernel function.Through improving the mathematical model of well selection,layer selection and construction parameters recommendation,the parameter design method of re-fracturing scheme in water injection block is formed.By using this method,eight old wells were selected for fracturing and stimulation in the L43 fault block,and the sand addition was successfully completed.The average daily oil production increased from 2.1 m^3 to 7.7 m^3.After fracturing,the production increased significantly and the overall oil production of the L43 fault block was increased.The parameter design method of re-fracturing scheme in water injection block of oil and gas field meets the demand of increasing production of water injection development block,the well selection parameters are comprehensive,and the sample size limit is reduced,which has guiding significance for old well fracturing in water injection block.

关 键 词：压裂改造 注水断块 压裂方案 灰色综合评价 支持向量机 复合叠加核函数 

分 类 号：TE21[石油与天然气工程—油气井工程]