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考虑地应力影响的煤层气水平井井眼变形破坏物理模型实验

ZHANG Qiangui DENG Jian FAN Xiangyu JIA Lichun GUO Xiaowei

西南石油大学学报（自然科学版）2025，Vol.47Issue(6)：107-118,12.

西南石油大学学报（自然科学版）2025，Vol.47Issue(6)：107-118,12.DOI:10.11885/j.issn.1674-5086.2024.11.04.02

考虑地应力影响的煤层气水平井井眼变形破坏物理模型实验

Physical Model Experiment on Wellbore Deformation and Failure of Coalbed Methane Horizontal Well Considering the Influence of In-situ Stresses

ZHANG Qiangui ¹DENG Jian ¹FAN Xiangyu ²JIA Lichun ³GUO Xiaowei⁴

作者信息

1. Petroleum Engineering School,Southwest Petroleum University,Chengdu,Sichuan 610500,China
2. School of Geoscience and Technology,Southwest Petroleum University,Chengdu,Sichuan 610500,China
3. Drilling&Production Technology Research Institute of CNPC Chuanqing Drilling Engineering Company Limited,Guanghan,Sichuan 618300,China
4. School of Robot Engineering,Yangtze Normal University,Fuling,Chongqing 408100,China
折叠

摘要

Abstract

Understanding wellbore instability mechanisms in coalbed methane(CBM)horizontal wells under complex stress conditions is crucial for optimizing CBM reservoir drilling.Using a self-developed true triaxial device to simulate surrounding rock deformation,this study examines how differential horizontal stresses and vertical stress variations affect deformation and failure in CBM horizontal wellbores,and obtains the following results:1)Wellbore deformation can be divided into three stages:slow shrinkage deformation stage,stable shrinkage deformation stage,and accelerated shrinkage until closure stage.2)In the latter two stages of wellbore deformation,the deformation of the specimen in three directions is mainly controlled by wellbore deformation and failure.3)As the maximum or minimum horizontal principal stress increases,the slope of the vertical principal stress-deformation curve during the stable shrinkage deformation stage of the wellbore significantly increases,and the strain in all three directions per unit stress increment decreases;simultaneously,the cross-sectional area at wellbore failure increases,with a corresponding increase in critical vertical principal stress and a decrease in vertical strain.4)When the two horizontal principal stresses increase simultaneously,the aforementioned trends become more pronounced,which is more conducive to maintaining wellbore stability.The findings of this study can provide guidance for the drilling design of CBM horizontal wells.

关键词

煤层气/水平地应力差异/井眼变形/井壁稳定性/物理模型

Key words

coalbed methane/horizontal in-situ stresses difference/wellbore deformation/wellbore stability/physical model

分类

能源科技

引用本文复制引用

ZHANG Qiangui,DENG Jian,FAN Xiangyu,JIA Lichun,GUO Xiaowei..考虑地应力影响的煤层气水平井井眼变形破坏物理模型实验[J].西南石油大学学报（自然科学版）,2025,47(6):107-118,12.

基金项目

国家自然科学基金(42172313) （42172313）

四川省自然科学基金(2024NSFSC0203) （2024NSFSC0203）

重庆市教委基金(KJQN202101438) （KJQN202101438）

西南石油大学学报（自然科学版）

OA北大核心

ISSN：1674-5086

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