天然气工业2017，Vol.37Issue(7)：60-68,9.DOI:10.3787/j.issn.1000-0976.2017.07.009
复杂缝网页岩压裂水平井多区耦合产能分析
Multi-zone coupling productivity of horizontal well fracturing with complex fracture networks in shale gas reservoirs
摘要
Abstract
In this paper,a series of specific studies were carried out to investigate the complex form of fracture networks and figure out the multi-scale flowing laws of nano/micro pores-complex fracture networks-wellbore during the development of shale reservoirs by means of horizontal well fracturing.First,hydraulic fractures were induced by means of Brazilian splitting tests.Second,the forms of the hydraulic fractures inside the rock samples were observed by means of X-ray CT scanning to measure the opening of hydraulic fractures.Third,based on the multi-scale unified flowing model,morphological description of fractures and gas flowing mechanism in the matrixcomplex fracture network-wellbore,the productivity equation of single-stage horizontal well fracturing which includes diffusion,slipping and desorption was established.And fourthly,a productivity prediction model of horizontal well multi-stage fracturing in the shale reservoir was established considering the interference between the multi-stage fracturing zones and the pressure drop in the horizontal wellbore.The following results were obtained.First,hydraulic fractures are in the form of a complex network.Second,the measured opening of hydraulic fractures is in the range of 4.25-453 μm,averaging 112 μtm.Third,shale gas flowing e in different shapes of fracture networks follows different nonlinear flowing laws.Forth,as the fracture density in the strongly stimulated zones rises and the distribution range of the hydraulic fractures in strongly/weakly stimulated zones enlarges,gas production increases gradually.As the interference occurs in the flowing zones of fracture networks between fractured sections,the increasing amplitude of gas production rates decreases.Fifth,when the length of a simulated horizontal well is 1500 m and the half length of a fracture network in the strongly stimulated zone is 100 m,the productivity effect of stage 10 fracturing is the best.Therefore,it is necessary to control fracturing degree reasonably and optimize fracturing parameters,so as to provide a theoretical support for the optimization design of shale gas reservoir fracturing.关键词
页岩气/储集层/压裂/水平井/复杂缝网/多区耦合/多尺度/干扰/生产能力Key words
Shale gas/Reservoir/Fracturing/Horizontal well/Complex fracture network/Multi-zone coupling/Multi-scale/Interference/Productivity capacity引用本文复制引用
朱维耀,马东旭,亓倩,宋智勇,岳明..复杂缝网页岩压裂水平井多区耦合产能分析[J].天然气工业,2017,37(7):60-68,9.基金项目
国家重点基础研究发展计划(973计划)项目“页岩气多场耦合非线性渗流理论研究”(编号:2013CB228002). （973计划）
