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页岩气储层四维地应力演化及加密井复杂裂缝扩展规律
引用本文:朱海燕,宋宇家,胥云,李奎东,唐煊赫.页岩气储层四维地应力演化及加密井复杂裂缝扩展规律[J].石油学报,2021,42(9):1224-1236.
作者姓名:朱海燕  宋宇家  胥云  李奎东  唐煊赫
作者单位:1. 成都理工大学油气藏地质及开发工程国家重点实验室 四川成都 610059;2. 西南石油大学油气藏地质及开发工程国家重点实验室 四川成都 610500;3. 中国石油勘探开发研究院 北京 100083;4. 中国石油天然气集团公司油气藏改造重点实验室 河北廊坊 065007;5. 中国石油化工集团有限公司江汉油田分公司石油工程技术研究院 湖北武汉 430035
基金项目:国家自然科学基金面上项目"页岩储层射孔簇内复杂三维多裂缝起裂与竞争扩展机理研究"(No.51874253)、国家自然科学基金联合基金项目"四川盆地深层页岩气安全高效钻井基础研究"(No.U19A2097)和国家科技重大专项"涪陵页岩气开发示范工程"(2016ZX05060-004)资助。
摘    要:页岩气储层天然裂缝发育,非均质性和各向异性强,储层压力、地应力等地质力学参数随着页岩气开采不断演化,使得老井与加密井裂缝扩展存在明显差异,这对后期加密井部署和压裂改造设计具有重要影响。综合考虑页岩气储层地质力学参数、天然裂缝等的非均质性和各向异性,提出了一套基于储层四维地应力演化的页岩气藏加密井水力压裂复杂裂缝扩展模拟方法,建立了气藏渗流-地质力学耦合的水力压裂复杂裂缝交错扩展模型,并通过现场试井数据、压裂施工参数、微地震监测数据等进行验证。以四川盆地X1页岩气井组为例,开展了页岩气储层长期开采过程中四维地应力动态演化及其对加密井复杂裂缝扩展的影响规律研究,研究结果发现:目标区域长期开采后,老井附近储层三向地应力均减小,但水平两向主应力差和垂向应力差增大,且地应力差增大程度在老井井筒处最大,越靠近加密井处则越小;受地层应力状态变化影响,加密井水力压裂复杂裂缝扩展规律与老井相比存在明显差异,相比老井,加密井水力压裂裂缝在井筒附近较复杂,越靠近老井越简单。

关 键 词:页岩气  加密井  气藏渗流与地质力学耦合  四维地应力演化  复杂裂缝扩展  
收稿时间:2020-09-03
修稿时间:2021-05-08

Four-dimensional in-situ stress evolution of shale gas reservoirs and its impact on infill well complex fractures propagation
Zhu Haiyan,Song Yujia,Xu Yun,Li Kuidong,Tang Xuanhe.Four-dimensional in-situ stress evolution of shale gas reservoirs and its impact on infill well complex fractures propagation[J].Acta Petrolei Sinica,2021,42(9):1224-1236.
Authors:Zhu Haiyan  Song Yujia  Xu Yun  Li Kuidong  Tang Xuanhe
Abstract:Shale gas reservoir is characterized with developed natural fractures, strong heterogeneity and anisotropy. During long-term production, the geomechanical parameters change accordingly, which results in the difference of hydraulic complex fractures propagation between infill well and parent well. The difference is the key factor for infill well placement and hydraulic fracturing treatment. In this paper, a numerical modelling method was proposed to investigate the infill well complex fractures propagation based on four-dimensional stress evolution during parent wells production. This method integrates with heterogeneity and anisotropy of geomechanical parameters and natural fractures, as well as the flow-geomechanics coupling process during parent wells production. The field data including well testes data, fracturing injection data, and microseismic monitoring data were involved to verify this method. A modelling case of X1 region in Sichuan Basin shale gas reservoir was involved to study the four-dimensional in-situ stress evolution of shale gas reservoirs and its impact on propagation law of infill well complex fractures propagation. It can be drawn from the result, all the principal stresses decrease after long-term production, but stress difference increase. The increase of stress difference is the largest in the region nearby the wellbore of parent wells, while the smallest in the region nearby the wellbore of infill well. The geometry of hydraulic fractures between infill well and parent wells shows a remarkable difference. The complexity of hydraulic fractures of infill well is much lower when it propagated to the parent well fractured region.
Keywords:shale gas  infill well  coupling of gas reservoir flow and geomechanics  four-dimensional in-situ stress evolution  complex fracture propagation  
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