基于EPHF模型均质多孔岩石材料水力压裂特性

doi:10.12068/j.issn.1005-3026.2021.07.013

东北大学学报（自然科学版） ›› 2021, Vol. 42 ›› Issue (7): 996-1004.DOI: 10.12068/j.issn.1005-3026.2021.07.013

基于EPHF模型均质多孔岩石材料水力压裂特性

李明，张砚琨，赵岐，梁力

(东北大学资源与土木工程学院，辽宁沈阳110819)

修回日期:2020-12-07 接受日期:2020-12-07 发布日期:2021-07-16
通讯作者: 李明
作者简介:李明(1980-)，男，辽宁沈阳人，东北大学副教授；梁力(1955-)，男，辽宁丹东人，东北大学教授，博士生导师.
基金资助:
中央高校基本科研业务费专项资金资助项目(N2001015)；国家留学基金委基金资助项目(201906085021)；国家自然科学基金资助项目(51474048) .

Characteristics of Hydraulic Fracture in Homogeneous Porous Rock Material Based on EPHF Model

LI Ming， ZHANG Yan-kun， ZHAO Qi， LIANG Li

School of Resources & Civil Engineering， Northeastern University， Shenyang 110819， China.

Revised:2020-12-07 Accepted:2020-12-07 Published:2021-07-16
Contact: LI Ming
About author:-
Supported by:
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摘要/Abstract

摘要： 基于流固耦合理论，在基于渗透率的水力压裂(PHF) 模型基础上建立了扩展渗透率的水力压裂(extended permeability-based hydraulic fracture，EPHF) 模型.该模型假设岩石材料在开裂过程中渗透率的改变为平均有效应力的函数，采用多孔介质弹性本构关系和Drucker-Prager塑性模型描述岩石材料开裂前后的力学行为，孔隙流体采用达西定律描述.引入LET模型和混合黏滞系数考虑等效开裂区域内由压裂液与原液体混合引起的渗透率修正.分析了抗拉强度对关键位置的水压力和应力路径发展过程的影响，以及等效开裂区域和裂缝高度随注水时间的变化过程.结果表明:裂缝路径上的点(不含注水点) 的水压力先降低后增加至传播压力；当有效应力差和初始水压力同时保持不变时或当总应力不变时，起裂压力随有效应力比的增加而降低.

关键词: 水力压裂；多孔岩石材料；起裂压力；EPHF模型；ABAQUS软件

Abstract: Based on a coupled fluid-solid theory， an extended permeability-based hydraulic fracture(EPHF) model was developed according to the permeability-based hydraulic fracture(PHF) model. The proposed EPHF model assumed that the permeability of porous rock was a function of mean effective stress when a rock was fractured. The porous elastic constitutive law and Drucker-Prager plastic model were adopted to model the pre-failure and post-fracture process of rock material， respectively. The Darcy’s law was used to describe the liquid phase. To consider the influence of injection fluid， the LET model was integrated to modify the permeability of fracture zone with the mixed viscosity of injection and original fluid being used. The development of pore pressure， stress path， equivalent fracture zone and fracture height for different tensile strength were studied by using the proposed model. The simulation results indicated that the pore pressure in fracture path(except injection point) first decreased and then increased to propagation pressure. If the effective stress difference and pore pressure were kept the same or if the total stress was constant， the breakdown pressure decreased when the effective stress ratio increased.

Key words: hydraulic fracture; porous rock material; breakdown pressure; extended permeability-based hydraulic fracture(EPHF) model; ABAQUS software

中图分类号:

TV139.1
TE31

李明，张砚琨，赵岐，梁力. 基于EPHF模型均质多孔岩石材料水力压裂特性[J]. 东北大学学报（自然科学版）, 2021, 42(7): 996-1004.

LI Ming， ZHANG Yan-kun， ZHAO Qi， LIANG Li. Characteristics of Hydraulic Fracture in Homogeneous Porous Rock Material Based on EPHF Model[J]. Journal of Northeastern University(Natural Science), 2021, 42(7): 996-1004.

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基于EPHF模型均质多孔岩石材料水力压裂特性

Characteristics of Hydraulic Fracture in Homogeneous Porous Rock Material Based on EPHF Model

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