基于PHF-LSM模型节理对应力阴影效应的影响

doi:10.12068/j.issn.1005-3026.2023.11.014

东北大学学报（自然科学版） ›› 2023, Vol. 44 ›› Issue (11): 1612-1620.DOI: 10.12068/j.issn.1005-3026.2023.11.014

基于PHF-LSM模型节理对应力阴影效应的影响

李明，陈昭，梁力

(东北大学资源与土木工程学院，辽宁沈阳110819)

发布日期:2023-12-05
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).

Influence of Joints on Stress Shadow Effect Based on PHF-LSM Model

LI Ming， CHEN Zhao， LIANG Li

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

Published:2023-12-05
Contact: LI Ming
About author:-
Supported by:
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摘要/Abstract

摘要： 采用PHF-LSM(permeability-based hydraulic fracture-level set method)水力压裂计算模型，建立了含节理分布的岩石材料模型，将其计算结果与裂缝几何特征和诱发应力理论解对比验证模型正确性，在此基础上分析节理对水力裂缝应力阴影效应的影响.计算结果表明:基于弥散裂缝模型的PHF模型应使用等效开裂区域最外侧结点位移差作为裂缝等效开度；节理的存在会影响裂缝注水过程中水压力变化，同时会引起裂缝等效开度的增大；较大的节理入射角度与距注水点较小的节理高度会产生更大诱发应力，同时会引起最小主应力方向的改变，导致更强应力阴影效应，裂缝偏转加强.

关键词: 水力压裂；应力阴影；PHF-LSM模型；节理

Abstract: Using PHF-LSM(permeability-based hydraulic fracture-level set method)hydraulic fracturing calculation model， a rock material model with joint distribution is established. The correctness of the model is verified by comparing the geometric characteristics of fractures and the theoretical solution of induced stress with the simulation result. On this basis， the influence of the presence of joints on the stress shadow effect of hydraulic fractures is analyzed. The simulation results indicate that: the displacement difference of the outermost node in the equivalent fracture region should be used as the equivalent fracture opening in the PHF model based on the dispersion fracture model; the existence of joints will affect the change of water pressure in the process of fracture water injection， and will increase the equivalent fractures opening; a larger joint incidence angle and a smaller joint height from the water injection point will produce greater induced stress， and change the direction of the minimum principal stress， resulting in a stronger stress shadow effect and enhanced fracture deflection.

Key words: hydraulic fracturing; stress shadow; PHF-LSM model; joint

中图分类号:

TU443

李明，陈昭，梁力. 基于PHF-LSM模型节理对应力阴影效应的影响[J]. 东北大学学报（自然科学版）, 2023, 44(11): 1612-1620.

LI Ming， CHEN Zhao， LIANG Li. Influence of Joints on Stress Shadow Effect Based on PHF-LSM Model[J]. Journal of Northeastern University(Natural Science), 2023, 44(11): 1612-1620.

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基于PHF-LSM模型节理对应力阴影效应的影响

Influence of Joints on Stress Shadow Effect Based on PHF-LSM Model

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