深层含夹矸组合煤岩水平井井壁失稳模拟研究

doi:10.16265/j.cnki.issn1003-3033.2025.11.1468

中国安全科学学报 ›› 2025, Vol. 35 ›› Issue (11): 122-130.doi: 10.16265/j.cnki.issn1003-3033.2025.11.1468

深层含夹矸组合煤岩水平井井壁失稳模拟研究

王鹤远¹^,²(), 冯福平¹^,²^,³^,^**(), 张健伟¹^,²^,³, 韩旭¹^,²^,³, 张宇昊¹^,², 杨冬临¹^,²

¹ 东北石油大学提高油气采收率教育部重点实验室,黑龙江大庆 163318
² 多资源协同陆相页岩油绿色开采全国重点实验室,黑龙江大庆 163318
³ 中国石油集团公司油气藏改造重点实验室,黑龙江大庆 163318

收稿日期:2025-03-13 修回日期:2025-06-12 出版日期:2025-11-28
通信作者:
^** 冯福平教授 (1982—),男,河北唐山人,博士,教授,主要从事井筒完整性失效机制与评价方面的研究。E-mail: fengfuping2005@163.com。
作者简介:
王鹤远 (1996—),男,河南驻马店人,博士研究生,主要研究方向为岩石力学、井壁稳定性等。E-mail:17719148589@163.com。
张健伟副教授。
基金资助:
国家科技重大专项(2025ZD1404205)

Simulation study on wellbore instability of horizontal wellbore in deep interbedded gangue combined coal rock

WANG Heyuan¹^,²(), FENG Fuping¹^,²^,³^,^**(), ZHANG Jianwei¹^,²^,³, HAN Xu¹^,²^,³, ZHANG Yuhao¹^,², YANG Donglin¹^,²

¹ Key Laboratory of Ministry of Education of China on Enhanced Oil and Gas Recovery, Northeast Petroleum University, Daqing Heilongjiang 163318, China
² State Key Laboratory of Continental Shale Oil, Daqing Heilongjiang 163318, China
³ Key Laboratory of Reservoir Stimulation, China National Petroleum Corporation, Daqing Heilongjiang 163318, China

Received:2025-03-13 Revised:2025-06-12 Published:2025-11-28

摘要/Abstract

摘要：

为解决夹矸与煤岩物理力学性质差异导致的组合煤岩井壁失稳问题,基于三轴压缩试验测定的煤岩及夹矸力学参数,结合组合煤岩破坏准则与流固耦合理论方程,建立深层含夹矸组合煤岩水平井井壁失稳数值模型。通过该模型模拟煤岩-夹矸组合形式对水平井井周坍塌压力的影响机制,并分析接触面位置参数及倾角变化对井周坍塌压力分布的影响规律。研究结果表明:煤岩与夹矸的矿物成分比例显著差异导致其接触面胶结强度薄弱,煤岩试样因强度较低更易破碎;物理力学性质差异及接触面弱胶结特性使得水平井钻遇不同组合煤岩时,井周坍塌压力在接触面处呈现明显突变;接触面位置变化影响煤岩与夹矸坍塌压力差值,而倾角改变不仅调控井壁坍塌压力峰值,还导致其极值位置发生迁移。

关键词: 含夹矸组合煤岩, 接触面, 水平井, 井壁稳定性, 坍塌压力

Abstract:

To address wellbore instability caused by differences in the physical-mechanical properties of coal-rock and gangue seams, this study established a numerical model for borehole collapse in deep horizontal wells with composite coal-rock layers. The model leveraged triaxial compression test data on coal-rock and gangue mechanics, integrating composite material failure criteria with poroelastic coupling equations. This model was used to simulate how coal-gangue configurations affect peripheral collapse pressure in horizontal wells and analyze the influence of interface positioning and dip angles on collapse pressure distribution. The results show that significant differences in mineral composition ratios between coal and gangue create compromised cementation strength at interfaces, where coal samples fracture more readily due to lower strength. Disparities in physical-mechanical properties and weak interfacial bonding cause pronounced pressure discontinuity at contacts when drilling traverses varied composites. While interface position dictates coal-gangue collapse pressure differentials, dip angle variations not only modulate peak collapse pressure magnitudes but also trigger migration of extreme-value locations along the borehole wall.

Key words: interbedded gangue combined coal rock, contact surface, horizontal well, wellbore stability, collapse pressure

中图分类号:

X936

王鹤远, 冯福平, 张健伟, 韩旭, 张宇昊, 杨冬临. 深层含夹矸组合煤岩水平井井壁失稳模拟研究[J]. 中国安全科学学报, 2025, 35(11): 122-130.

WANG Heyuan, FENG Fuping, ZHANG Jianwei, HAN Xu, ZHANG Yuhao, YANG Donglin. Simulation study on wellbore instability of horizontal wellbore in deep interbedded gangue combined coal rock[J]. China Safety Science Journal, 2025, 35(11): 122-130.

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参数	数值
最大水平地应力/MPa	64.83
最小水平地应力/MPa	54.75
上覆岩层压力/MPa	69.24
地层压力/MPa	41.16
煤岩密度/(g·cm³)	1.54
煤岩渗透率/μm²	0.047×10^-3
煤岩孔隙度/%	6.09
煤岩黏聚力/MPa	2.92
煤岩内摩擦角/(°)	8.51
煤岩杨氏模量/GPa	2.8
煤岩泊松比	0.31
夹矸密度/(g·cm³)	2.53
夹矸渗透率//μm²	0.012×10^-3
夹矸孔隙度/%	4.8
夹矸黏聚力/MPa	11.633
夹矸内摩擦角/(°)	30.69
夹矸杨氏模量/GPa	7.3
夹矸泊松比	0.16
接触面黏聚力/MPa	0
钻井液黏度/(mPa·s)	20

深层含夹矸组合煤岩水平井井壁失稳模拟研究

Simulation study on wellbore instability of horizontal wellbore in deep interbedded gangue combined coal rock

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