深圳大学学报（理工版）2024，Vol.41Issue(1)：22-32,11.DOI:10.3724/SP.J.1249.2024.01022
基于停泵压降数据的页岩气井单段裂缝参数反演
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
摘要
Abstract
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 network exhibits a strong linear correlation with the cluster average fracturing fluid volume,reflecting the technological advancement of"Fracturing Technology 2.0"in the Changning block shale gas wells.Obtaining single-stage fracture parameters for shale gas wells provides more effective analytical indicators for the analysist of production control factors and the evaluation of hydraulic fracturing effectiveness.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Key words
oil and natural gas reservoir development/well testing analysis/shale gas well/fracture parameters inver-sion/pressure-drop of pumping shutdown/fracturing effect assessment分类
能源科技引用本文复制引用
赵玉龙,崔乾晨,高上钧,陈满,郑纯桃,张烈辉..基于停泵压降数据的页岩气井单段裂缝参数反演[J].深圳大学学报（理工版）,2024,41(1):22-32,11.基金项目
National Natural Science Foundation of China(52222402,52234003,52074235) （52222402,52234003,52074235）
Sichuan Outstanding Youth Science Foundation(2022JDJQ0009) 国家自然科学基金资助项目(52222402,52234003,52074235) （2022JDJQ0009）
四川省杰出青年科技人才资助项目(2022JDJQ0009) （2022JDJQ0009）
