电爆冲击波对储层致裂效果影响因素的数值模拟研究
投稿时间:2020-05-16  修订日期:2020-05-26  点此下载全文
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作者单位E-mail
江海畏 中国地质大学北京工程技术学院 1191951743@qq.com 
薛启龙 中国地质大学北京工程技术学院  
中文摘要:电爆冲击波在油气储层增渗解堵中具有巨大应用潜力,为了解各因素对电爆冲击波致裂效果的影响程度,本文采用ANSYS/LS-DYNA软件,通过改变地应力、弹性模量、抗拉强度参数进行数值模拟,结果显示,地应力对裂纹扩展具有强烈的抑制作用,在双向等压地应力作用下,裂纹区形状为圆形,并且随着地应力的增大,岩体破裂度、破裂半径均逐渐减小。在双向不等压地应力作用下,随水平主应力差值增大,裂纹扩展方向由圆形逐渐转变为椭圆形,具有沿最大水平主应力方向扩展的特点;弹性模量对致裂效果具有重要影响,随着弹性模量的增大,岩体破裂度、破裂半径均呈增大趋势;随抗强度增大,岩体破裂度、破裂半径均减小。
中文关键词:ANSYS/LS-DYNA  电爆冲击波  影响因素  破裂度  破裂半径。
 
Numerical Simulation Study on the Influencing Factors of Electric Explosion Shock Wave on Reservoir Fracturing Effect
Abstract:The electric blast shock wave has great application potential in increasing permeability and plugging of oil and gas reservoirs.Using ANSYS / LS-DYNA software, the influencing factors of electric blast shock wave cracking effects: in-situ stress, elastic modulus and tensile strength are numerically simulated. The simulation results show that in-situ stress has a strong inhibitory effect on crack propagation. Under the action of two-way isobaric in-situ stress, the shape of the crack zone is circular, and with the increase of in-situ stress, the fracture degree and fracture radius of the rock mass decrease gradually. Under the action of bi-directional unequal compressive in-situ stress, as the difference of horizontal principal stress increases, the direction of crack propagation gradually changes from circular to elliptical, with the characteristic of extending along the direction of maximum horizontal principal stress; the elastic modulus has the effect of cracking Important influence: With the increase of elastic modulus, the fracture degree and fracture radius of the rock mass increase; as the resistance strength increases, the fracture degree and fracture radius of the rock mass decrease.
keywords:ANSYS / LS-DYNA  electric blast shock wave  influencing factors  rupture degree  rupture radius
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