摘要
为研究地应力对聚能射流侵彻页岩储层的影响,建立了聚能射流侵彻不同围压页岩的准二维模型,采用动态松弛法加载页岩围压分别为0、10、20、30 MPa,分别从射孔深度、页岩孔裂隙形成规律特征和监测点应力变化等方面系统性分析了射流侵彻下的页岩损伤致裂机理。研究结果表明:聚能射流侵彻页岩后损伤区域可以分为完全破坏区、压剪破坏区、拉伸破坏区,围压增加造成破坏区域减小。围压对于页岩射孔深度和损伤致裂效果具有明显影响,无围压下页岩的侵彻深度为600.3 mm,10、20、30 MPa围压下页岩的侵彻深度分别减小至524.3、454.3、446.1 mm,减小幅度分别为12.66%、24.32%、25.69%,更高的围压对页岩孔周裂隙的发育和损伤具有更明显的抑制作用。页岩射孔过程中的峰值压力随着与孔道中心距离增大而快速减小,且衰减速度逐渐由快减慢;随着与侵彻起点距离增大而逐渐减小,减小趋势近似为线性;相同监测点峰值压力随围压增大呈现明显的增加趋势。
In order to study the influence of in-situ stress on the penetration of shaped jets into shale reservoirs,a quasitwo-dimensional model of shaped jets penetrating shale under different confining pressures was established,and the shale confining pressures loaded by dynamic relaxation method were 0,10,20 and 30 MPa,respectively,and the fracture mechanism of shale damage caused by jet penetration was systematically analyzed from the aspects of perforation depth,shale pore fracture formation law characteristics and stress changes at monitoring points.The results show that the damage area of shaped jet after penetration into shale can be divided into complete failure zone,compression-shear failure zone and tensile failure zone,and the failure area decreases due to the increase of confining pressure.The penetration depth of shale without confining pressure is 600.3 mm,and the penetration depth of shale under 10,20 and 30 MPa confining pressure decreases to 524.3,454.3 and 446.1 mm,respectively,with a reduction range of 12.66%,24.32%and 25.69%,respectively.The peak pressure of shale perforation decreases rapidly with the increase of the distance from the center of aperture,and the attenuation rate gradually decreases from fast to fast,and decreases gradually with the increase of the distance from the starting point of penetration,and the decreasing trend is approximately linear.
作者
罗宁
柴亚博
牟恭雨
王一鸣
王路伽
LUO Ning;CHAI Yabo;MOU Gongyu;WANG Yiming;WANG Lujia(State Key Laboratory of Intelligent Construction and Healthy Operation and Maintenance of Deep Underground Engineering,Xuzhou 221116,China;School of Mechanics and Civil Engineering,China University of Mining and Technology,Xuzhou 221116,China;School of Electrical Engineering,China University of Mining and Technology,Xuzhou 221116,China)
出处
《金属矿山》
CAS
北大核心
2024年第5期179-189,共11页
Metal Mine
基金
“十三五”国家重点研发计划项目(编号:2020YFA0711800)
国家自然科学基金项目(编号:12072363,12372373)
中国矿业大学研究生创新计划项目(编号:2023WLJCRCZL044)。
关键词
侵彻损伤
页岩储层
高地应力
本构模型
数值模拟
penetrating injury
shale reservoir
high geo-stress
constitutive model
numerical simulation
