页岩气储层四维地应力演化及加密井复杂裂缝扩展规律

doi:10.7623/syxb202109009

石油学报 ›› 2021, Vol. 42 ›› Issue (9): 1224-1236.DOI: 10.7623/syxb202109009

页岩气储层四维地应力演化及加密井复杂裂缝扩展规律

朱海燕^1,2, 宋宇家², 胥云^3,4, 李奎东⁵, 唐煊赫¹

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

收稿日期:2020-09-03 修回日期:2021-05-08 出版日期:2021-09-25 发布日期:2021-10-12
通讯作者: 朱海燕,男,1984年4月生,2006年获西南石油大学学士学位,2013年获中国石油大学(北京)博士学位,现为成都理工大学能源学院教授、博士生导师,主要从事石油钻采岩石力学研究。
作者简介:朱海燕,男,1984年4月生,2006年获西南石油大学学士学位,2013年获中国石油大学(北京)博士学位,现为成都理工大学能源学院教授、博士生导师,主要从事石油钻采岩石力学研究。Email:zhuhaiyan040129@163.com
基金资助:
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。

Four-dimensional in-situ stress evolution of shale gas reservoirs and its impact on infill well complex fractures propagation

Zhu Haiyan^1,2, Song Yujia², Xu Yun^3,4, Li Kuidong⁵, Tang Xuanhe¹

1. State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Chengdu University of Technology, Sichuan Chengdu 610059, China;
2. State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Sichuan Chengdu 610500, China;
3. PetroChina Research Institute of Petroleum Exploration and Development, Beijing 100083, China;
4. CNPC Key Laboratory of Oil and Gas Reservoir Stimulation, Hebei Langfang 065007, China;
5. Petroleum Engineering Technology Research Institute, Sinopec Jianghan Oilfield Company, Hubei Wuhan 430035, China

Received:2020-09-03 Revised:2021-05-08 Online:2021-09-25 Published:2021-10-12

摘要/Abstract

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

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.

Key words: shale gas, infill well, coupling of gas reservoir flow and geomechanics, four-dimensional in-situ stress evolution, complex fracture propagation

中图分类号:

TE371

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.

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.

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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

Four-dimensional in-situ stress evolution of shale gas reservoirs and its impact on infill well complex fractures propagation

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