逆冲构造带精细地应力和井壁稳定性研究及应用

新疆石油地质 ›› 2011, Vol. 32 ›› Issue (2): 193-196.

逆冲构造带精细地应力和井壁稳定性研究及应用

沈海超¹, 胡晓庆²

1.中国石化国际石油勘探开发有限公司,北京 100083;
2.中海石油研究总院,北京 100027

收稿日期:2010-10-29 发布日期:2020-08-11
作者简介:沈海超（1982-）,男,安徽东至人,博士,油气工程力学,（Tel）15010435972（E-mail）hcshen@sipc.cn.

Research on In-Situ Stress and Wellbole Stability of Overthrust Structural Belt and Its Application

SHEN Hai-chao¹, HU Xiao-qing²

1. International Petroleum Exploration and Development Company Ltd., Sinopec, Beijing 100083, China;
2. Research Institute, CNOOC, Beijing 100027, China

Received:2010-10-29 Published:2020-08-11

摘要/Abstract

摘要： 逆冲构造区的构造应力强,层理、裂隙发育,井壁失稳是一个一直困扰着这一地区钻井工程的难题。认识此类构造地应力分布规律是井壁应力状态分析以及井壁稳定性研究的基础。提出了一套逆冲构造带精细地应力场研究方法,该方法以地应力测量为基础,采用基于有限元法及数学优化理论的有限元约束优化反演法对逆冲构造带三维地应力场进行模拟,并利用现场地漏实验等资料进行验证。通过泥页岩水化实验,分析了泥页岩水化特性以及岩石力学性质与含水量的关系,在此基础上,建立了分析水敏性泥页岩井壁围岩应力状态的基本模型,并结合岩石强度准则,编制了井壁稳定分析程序,用于分析坍塌压力、破裂压力、安全钻井液密度窗口以及泥页岩坍塌周期等。这一研究成果对于认识逆冲推覆带泥页岩井壁失稳内在机理以及相关对策的制定具有指导意义。

关键词: 逆冲构造带, 地应力, 有限元约束优化反演, 泥页岩水化, 井壁稳定, 坍塌周期

Abstract: Overthrust nappe structure usually has strong tectonic stress and abundant bedding and cracks, and borehole instability has plagued its drilling operation. It is necessary to determine the in-situ stresses distribution before research on wellbore stress state and wellbore stability. In this study, a new method for study on the in-situ stress distribution of overthrust nappe structure is proposed. Based on in-situ stress measurement, adopting the constrained optimization finite element method (COFEM), 3D in-situ stress of this structure is numerically simulated and verified by field formation leak-off test data. The feature of shale hydration and the relation between the rock mechanical properties and water content are analyzed from the experiment of the shale hydration. Based on the behavior of shale hydration and the failure criterion of rocks, the model for stress distribution of the water sensitive shale borehole surrounding beds was developed and the software for shale borehole stability is programmed. The software can be used to research on the collapsing pressure, fracture pressure, the safe drilling fluid density window and the shale collapse cycle. This study is useful for the mechanism analysis of shale wellbore instability in the overthrust nappe structure and the related countermeasures arrangement.

Key words: overthrust nappe structure, in-situ stress, COFEM, shale hydration, wellbole stability, collapse cycle

中图分类号:

TE21

沈海超, 胡晓庆. 逆冲构造带精细地应力和井壁稳定性研究及应用[J]. 新疆石油地质, 2011, 32(2): 193-196.

SHEN Hai-chao, HU Xiao-qing. Research on In-Situ Stress and Wellbole Stability of Overthrust Structural Belt and Its Application[J]. Xinjiang Petroleum Geology, 2011, 32(2): 193-196.

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