首页|不同射孔角度对页岩压裂效果的影响

不同射孔角度对页岩压裂效果的影响

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水力压裂是非常规油气开采的关键技术.在进行水力压裂的过程中,水力裂缝和天然裂隙相互作用形成复杂缝网是非常规油气高效开采的前提,而射孔方案设计对缝网的复杂程度有着重要影响.为了更深入研究压裂缝网的演化机理,模拟真实节理裂隙岩体在水力压裂中的裂缝扩展过程,从而科学、合理地优化射孔方案,本文采用全局嵌入cohesive单元的方法,利用Python进行二次开发创建DFN离散裂隙网络,建立了考虑离散裂隙网络的岩体天然裂隙模型,同时设置相同条件下不考虑DFN离散裂隙网络的模型进行对比,研究不同角度射孔方案对压裂效果的影响.通过MATLAB编程提取加载过程中的声发射定位图和声发射能量数据,对裂纹破裂机理和扩展过程进行了进一步分析.结果表明:天然裂缝的活化受射孔间产生的应力阴影、射孔与天然裂缝的角度影响;查明页岩的天然裂缝分布规律,设法提高射孔与天然裂缝的角度,使水力裂缝更容易与天然裂缝沟通并沿着天然裂缝扩展,从而形成复杂缝网.
INFLUENCE OF DIFFERENT PERFORATION ANGLES ON SHALE FRAC-TURING EFFECT
Hydraulic fracturing is a key technology for unconventional oil and gas exploration.In the process of hy-draulic fracturing,the interaction of hydraulic fractures and natural fractures to form a complex fracture network is the premise for the efficient exploitation of unconventional oil and gas,and the design of perforation scheme has an important impact on the complexity of the fracture network.In order to further study the evolution mechanism of the fracture network,simulate the fracture propagation process of the real jointed fractured rock mass in hydraulic frac-turing,and optimize the perforation plan scientifically and reasonably,this paper adopts the method of global em-bedding of cohesive elements,and uses Python to carry out the second development.A DFN discrete fracture net-work was created,and a natural fracture model of the rock mass considering the discrete fracture network was estab-lished.At the same time,the models without DFN discrete fracture network were set under the same conditions for comparison,and the influence of different angles of perforation schemes on the fracturing effect was studied.The a-coustic emission localization map and acoustic emission energy data during the loading process are extracted by MATLAB programming,and the crack rupture mechanism and propagation process are further analyzed.The results show that the activation of natural fractures is affected by the stress shadow generated between perforations and the angle between perforations and natural fractures;the distribution law of natural fractures in shale is identified,and the angle between perforation and natural fractures is improved to make hydraulic fractures easier.It communicates with and spreads along the natural fractures to form a complex fracture network.

ABAQUSRandom fracture networkStress shadowAcoustic emissionIncident angle

赵岩、崔振东、彭瑞东、韩伟歌、张建勇、司凯、赵磊磊

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中国矿业大学(北京),力学与建筑工程学院,北京 100083,中国

中国科学院地质与地球物理研究所,中国科学院页岩气与地质工程重点实验室,北京 100029,中国

中国科学院地球科学研究院,北京 100029,中国

中国科学院大学,地球与行星科学学院,北京 100049,中国

中国矿业大学(北京),力学与建筑工程学院,煤炭资源与安全开采国家重点实验室,北京 100083,中国

石家庄铁道大学,省部共建交通工程结构力学行为与系统安全国家重点实验室,石家庄 050043,中国

防灾科技学院地质工程学院,三河 065201,中国

郑州工程技术学院,郑州 450044,中国

新疆工程学院,矿业工程与地质学院,乌鲁木齐 830023,中国

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ABAQUS 随机裂隙网络 应力阴影 声发射 入射角度

国家自然科学基金专项项目国家自然科学基金面上项目

4214100941972296

2024

10.13544/j.cnki.jeg.2022-0040

工程地质学报
中国科学院地质与地球物理研究所

工程地质学报

CSTPCD北大核心
影响因子：1.215
ISSN：1004-9665
年,卷(期)：2024.32(4)