基于停泵压降数据的页岩气井单段裂缝参数反演——以长宁N209井区页岩气井为例  

The inversion of the single-stage hydraulic fracture parameters for shale gas well based on the shut-in pressure-drop data:a case of shale gas well in Changning N209 well area

作　　者：赵玉龙[1] 崔乾晨 高上钧 陈满 郑纯桃 张烈辉[1] ZHAO Yulong;CUI Qianchen;GAO Shangjun;CHEN Man;ZHENG Chuntao;and ZHANG Liehui(National Key Laboratory of Oil and Gas Reservoir Geology and Exploitation,Southwest Petroleum University,Chengdu 610500,Sichuan Province,P.R.China;Sichuan Changning Natural Gas Development Co.Ltd.,Chengdu 610051,Sichuan Province,P.R.China;Shunan Gas Mine,Southwest Oil and Gas Field Company,PetroChina,Luzhou 646001,Sichuan Province,P.R.China)

机构地区：[1]西南石油大学油气藏地质及开发工程全国重点实验室,四川成都610500 [2]四川长宁天然气开发有限责任公司,四川成都610051 [3]中国石油天然气股份有限公司西南油气田分公司蜀南气矿,四川泸州646001

出　　处：《深圳大学学报（理工版）》2024年第1期22-32,共11页Journal of Shenzhen University(Science and Engineering)

基　　金：国家自然科学基金资助项目(52222402,52234003,52074235);四川省杰出青年科技人才资助项目(2022JDJQ0009)

摘　　要：水平井多级分段多簇压裂是页岩气藏有效开发的关键技术,准确评价缝网参数是开展压裂效果评估、压裂工艺优化和压后产能预测等工作的重要前提.传统页岩气井压裂裂缝参数表征主要采用裂缝扩展模拟与现场监测等手段,对压裂施工停泵压降曲线的信息挖掘与利用不足.采用数字滤波方法消除停泵压降数据的水锤波动,利用分形裂缝表征页岩气井压裂缝网,结合数值试井分析实现了单段裂缝参数反演,建立了一套基于停泵压降数据的缝网参数反演工作流程.该成果在长宁公司N209井区压裂井成功应用,并对裂缝参数评价结果与一体化压裂模拟和产气剖面测试等反演结果进行了验证.结果表明,基于停泵阶段压降数据的单段裂缝参数反演结果显著提升了参数解释精度,有助于揭示页岩气井段间产气能力差异的原因;气井产能与裂缝总长和裂缝表面积的相关性明显高于利用广域电磁法确定的压裂改造体积,其中,早期日产气量与总缝长相关性最高;预计最终回收率与裂缝表面积相关性最高;缝网总长与单簇压裂液规模强线性相关,反映了长宁区块页岩气井压裂工艺2.0的技术先进性.获取页岩气井单段裂缝参数可为产能主控因素分析和压裂效果评价提供更加有效的分析指标.Multi-stage fracturing in horizontal wells is a key technology for the effective development of shale gas reservoirs.Accurate evaluation of hydraulic fracture network parameters is an important prerequisite for activities such as the evaluation of fracturing effect,fracturing process optimization and productivity prediction after hydraulic fracturing.Traditional characterizations methods of hydraulic fracture parameters are mainly focus on fracture propagation simulation and on-site monitoring measure,with insufficient exploration and utilization of information from the hydraulic fracturing curves during pumping shut-in stage.This study employs a digital filtering method to mitigate pressure-drop wave artifacts resulting from water hammer during shut-in.It utilizes the fractal fracture characterizing fracture network in shale gas wells,and integrates numerical well testing analysis method to achieve the fracture parameter inversion of each single stage,and establishes a workflow for hydraulic fracture parameters inversion based on the pressure-drop data during shut-in fracturing stage.The outcomes of this study have been effectively applied in the fracturing wells in well area N209 of Changning company,and the inversion results are verified by the fracturing simulation and gas production profile data.This research demonstrates a substantial enhancement in parameters interpretation accuracy achieved through the utilization of single-stage fracture parameters,which is helpful to reveal the reasons for the difference of gas production capacity between stages of horizontal well,the correlation between well productivity and total length of fracture network,fracture surface area is significantly higher than that of stimulated reservoir volume calculated by wide field electromagnetic methods.The correlation between gas rate and total fracture length is the highest at early production period,and the correlation between estimated ultimate recovery(EUR)and fracture surface area is the highest.The total length of fracture n

关 键 词：油气田开发 试井分析 页岩气井 裂缝参数反演 停泵压降 压裂效果评估 

分 类 号：TE353[石油与天然气工程—油气田开发工程]