深层泥页岩井壁失稳机理与预测模型研究进展
投稿时间:2021-03-23  修订日期:2021-08-23  点此下载全文
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作者单位邮编
程万 中国地质大学(武汉)湖北 武汉 430074 430074
孙家应 安徽省煤田地质局第一勘探队安徽 淮南 232052 232052
尹德战 安徽省煤田地质局第一勘探队安徽 淮南 232052 232052
蒋国盛 中国地质大学(武汉)湖北 武汉 430074 430074
基金项目:安徽省煤田地质局重点科技攻关项目“两淮矿区地面定向多分支水平井高效钻进技术体系研究”(编号:皖煤地科2020-2)
中文摘要:深层油气资源开发已成为国家油气发展的重要战略,泥页岩井段井壁失稳是制约深层油气资源安全高效开发的技术“瓶颈”。本文在分析深层泥页岩井壁失稳的力学机理和化学机理基础上,着重论述考虑泥页岩水化作用、弱结构面、各向异性和多场耦合的井壁稳定性预测模型的研究进展和发展趋势。钻井液密度不合理是井壁力学失稳的主要原因,泥页岩水化作用是井壁化学失稳的主要原因;在井壁流-固-热-化四场耦合作用下,考虑弱结构面、各向异性对泥浆安全密度窗口的影响,是目前研究深层泥页岩井壁稳定性的主要趋势和方法。
中文关键词:井壁稳定  坍塌压力  破裂压力  钻井液  泥页岩
 
Research status of the wellbore failure mechanism and predicting model in deep mudstone and shale
Abstract:The exploitation of deep oil and gas resources has become an important strategy of national oil and gas development, and borehole instability in mudstone and shale formations is the technical bottleneck restricting the safe and efficient development of deep oil and gas resources. This paper analyzes the mechanical and chemical mechanisms of deep mudstone shale borehole failure with the focus on the research status and development trend of wellbore stability prediction models for shale hydration, weak structural plane, anisotropy and multi-field coupling. Improper mud density is the major cause for mechanical wellbore failure, while mudstone and shale hydrations are the major causes for chemical wellbore failure. Investigation of the effects of the weak plane and anisotropy on the safe density window of drilling mud is the major method to study the wellbore stability in deep mud and shale formations under the action of the fluid-solid-thermal-chemical coupling behavior on the wellbore.
keywords:wellbore stability  collapse pressure  breakdown pressure  drilling mud  shale
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