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| 裂缝性地层钻井液漏失规律及堵漏对策 |
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吕开河1,王晨烨1,雷少飞1,孙金声1,2,白英睿1,王金堂1,王韧2,王建龙1
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(1.中国石油大学(华东)石油工程学院,山东青岛 266580;2.中国石油集团工程技术研究院有限公司,北京 102206)
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| 摘要: |
| 井漏是钻井过程中最常见的井下复杂问题,是制约井下安全、影响钻井进度的主要因素之一,而钻井液漏失模型较少考虑裂缝临界宽度、裂缝壁面粗糙度以及综合因素对漏失的影响,从而导致漏失机制对现场堵漏指导性较差。针对此问题,基于非牛顿流体力学理论,建立径向粗糙裂缝漏失模型,厘清裂缝临界宽度、裂缝粗糙度以及综合漏失因子等因素对漏失的影响,形成新的防漏堵漏设计准则。结果表明:钻井液漏失量随裂缝宽度增加而增加,随钻井液流变性、裂缝粗糙度及综合漏失因子增加而减小;依据裂缝临界宽度,裂缝性地层漏失可分为微尺度、中尺度和大尺度裂缝性漏失,3种不同的漏失类型需采取与之相适应的堵漏材料进行封堵。 |
| 关键词: 裂缝性地层 钻井液漏失 漏失模型 粗糙裂缝 裂缝临界宽度 堵漏对策 |
| DOI：10.3969/j.issn.1673-5005.2022.02.008 |
| 分类号::TE 21 |
| 文献标识码:A |
| 基金项目:国家自然科学基金重大项目(51991361)；国家自然科学基金-石油化工联合基金(A类)重点项目(U1762212)；中国石油天然气集团公司重大工程技术现场试验项目(2020F-45) |
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| Dynamic behavior and mitigation methods for drilling fluid loss in fractured formations |
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LÜ Kaihe1, WANG Chenye1, LEI Shaofei1, SUN Jinsheng1,2, BAI Yingrui1, WANG Jintang1, WANG Ren2, WANG Jianlong1
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(1.School of Petroleum Engineering in China University of Petroleum (East China), Qingdao 266580, China;2.CNPC Engineering Technology R ＆ D Company Limited, Beijing 102206, China)
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| Abstract: |
| Lost circulation is one of the most troublesome problems in well-drilling, which can significantly affect downhole safety and drilling speed. At present, when modeling the lost circulation in fractured formations, the influence of fracture width and roughness, and the comprehensive loss factor are not considered, which can lead to poor understanding on the mechanisms of lost circulation. In this study, a mathematical model based on Non-Newtonian fluid mechanics for drilling fluid flow and loss in fractured formations was proposed. The effects of critical width and roughness of the fractures and the comprehensive loss factor on drilling fluid loss in fractured formations were investigated, and a new design criterion for loss prevention and control was established. The modeling results indicate that the amount of drilling fluid loss increases with increase of fracture width, and decreases with increase of the apparent viscosity of drilling fluid, the fracture roughness, and the comprehensive loss factor. According to the critical width of fractures, lost circulation can be divided into three types, the microscale fracture loss, the medium-scale fractured loss, and the large-scale fractured loss, which need different blocking materials for the control of the drilling fluid loss into fractures. |
| Key words: fractured formations drilling fluid loss drilling fluid loss model rough fracture fracture critical width loss control countermeasures |
