基于ABAQUS裂缝相互作用规律研究  

Study on interaction law of fractures based on ABAQUS

作　　者：寇园园 孙晨 魏奔驰 KOU Yuanyuan;SUN Chen;WEI Benchi(College of Petroleum Engineering,Xi'an Shiyou University,Xi'an Shaanxi 710065,China;Shaanxi Key Laboratory of Well Stability and Fluid&Rock Mechanics in Oil andGas Reservoirs,Xi'an Shaanxi 710065,China)

机构地区：[1]西安石油大学石油工程学院,陕西西安710065 [2]陕西省油气井及储层渗流与岩石力学重点实验室,陕西西安710065

出　　处：《石油化工应用》2022年第4期20-25,共6页Petrochemical Industry Application

基　　金：西安石油大学研究生创新与实践能力培养计划项目,项目编号:YCS21113097。

摘　　要：针对储层压裂后水力裂缝与天然裂缝之间的相互作用机制的复杂性,且目前尚不能清楚地对单条水力裂缝和单条天然裂缝相交的作用机制进行定量分析。因此,对其相互作用机制的研究是极其必要的。本文通过ABAQUS数值模拟软件对不同应力差、不同HF与NF裂缝倾角、不同岩石抗拉强度等条件下裂缝扩展形态的求解。结果表明:在较低应力差、较低裂缝倾角、较高岩石抗拉强度的情况下,水力裂缝会被捕获,沿着天然裂缝方向延伸,有助于形成缝网;在较高应力差、较高裂缝倾角、较低岩石抗拉强度的情况下,HF直接穿过NF,对缝网形成不利。通过模拟裂缝相互作用规律,对现场压裂和缝网形态预测具有一定的指导和借鉴意义。In view of the complexity of the interaction mechanism between hydraulic fractures and natural fractures after reservoir fracturing,it is still not clear to quantitatively analyze the interaction mechanism between a single hydraulic fracture and a single natural fracture.Therefore,it is extremely necessary to study the interaction mechanism.In this paper,ABAQUS numerical simulation software is used to solve the crack propagation patterns under different stress differences,different dip angles between hydraulic cracks and natural cracks and different rock tensile strengths.The results show that under the conditions of low stress difference,low fracture dip angle and high rock tensile strength,hydraulic fractures will be captured and extend along the natural fracture direction,which is helpful to form fracture network.Under the conditions of high stress difference,high fracture dip angle and low rock tensile strength,hydraulic fracture directly passes through natural fracture,which is unfavorable to the formation of fracture network.By simulating the law of fracture interaction,it has certain guiding and reference significance for field fracturing and fracture pattern prediction.

关 键 词：水力裂缝 天然裂缝 岩石抗拉强度 应力差 裂缝倾角 

分 类 号：TE357.11[石油与天然气工程—油气田开发工程]