摘要
高频压力监测技术是一种实时、简单、低成本的压裂监测方法,压裂顶替结束后,地面泵车快速降低排量,在井筒中产生水击波。通过高频采集和分析施工过程中激发的水击压力波,正演获取井下压裂改造进液深度,对段内裂缝起裂位置、暂堵转向效果、桥塞机械封隔等进行有效评估,从而辅助评价压裂施工效果,指导现场施工决策,实现资源合理配置,保证页岩气藏综合开发效益。本文通过在长宁某页岩气水平井暂堵压裂中应用高频压力监测技术,对暂堵转向效果及桥塞机械封隔效果进行评估。同时,根据水击压力波的衰减特性评估了井下裂缝的复杂程度。最后,对比了其在长宁某井和基于暂堵前后压力增的压力曲线暂堵判定法的诊断效果,高频压力监测技术对暂堵转向效果识别能力更强,识别率从45%提升至75%,诊断效果更佳。高频水击压力监测的应用能辅助页岩气水平井压裂工艺参数优化,助力国内页岩气藏高效开发。
High-frequency pressure monitoring(HFPM)is a real-time,easy to operate and cost-effective method for hydraulic fracturing diagnostics.It enables the rapid assessment of injection point depth,fracture initiation position,temporary plugging and diversion effects and mechanical plug sealing.By analyzing water hammer pressure waves stimulated during the fracturing process,it facilitates the evaluation of fracturing stimulation effectiveness,guiding on-site construction decisions,resource allocation rationalization,and the comprehensive development of shale gas reservoirs.In this study,HFPM is employed to evaluate the temporary plugging effect and mechanical plug sealing efficiency in the fracturing of a horizontal shale gas well in Changning.Additionally,the complexity of the fractures is assessed based on the attenuation characteristics of the water hammer pressure wave.A comparative analysis is conducted between the diagnostic effects of HFPM and the pressure increase method before and after temporary plugging.HFPM demonstrates a higher ability to identify temporary plugging turning effects,with a recognition rate increasing from 45%to 75%,and exhibits superior diagnostic performance.The application of HFPM can con-tribute to the optimization of fracturing process parameters for shale gas horizontal wells and facilitate the efficient development of shale gas reservoirs in China.
作者
雍锐
丘阳
周福建
胡晓东
宋毅
周小金
YONG Rui;QIU Yang;ZHOU Fujian;HU Xiaodong;SONG Yi;ZHOU Xiaojin(Unconventional Oil-Gas Science and Technology Research Institute,China University of Petroleum-Beijing,Beijing 102249,China;Shale Gas Research Institute,PetroChina Southwest Oil&Gas Field Company,Chengdu 610051,China)
出处
《石油科学通报》
CAS
2024年第5期789-797,共9页
Petroleum Science Bulletin
基金
国家自然科学基金面上基金“水击压力波-光纤声波数据融合的多裂缝尺寸反演方法(52374019)”资助。
关键词
页岩气
水力压裂
压裂诊断
暂堵评估
高频水击压力监测
水击压力波
shale gas
hydraulic fracturing
fracturing diagnostics
temporary plugging evaluation
high frequency pressure monitoring
water hammer pressure wave
