钻井液与完井液2025，Vol.42Issue(1)：58-65,8.DOI:10.12358/j.issn.1001-5620.2025.01.006
渤海盆地锦州25-1区块中部泥岩地层井壁失稳机理及钻井液对策
Mechanisms of Borehole Wall Destabilization in Drilling Shale Formations in the Central Part of Block Jinzhou-25-1 in Bohai Basin and Drilling Fluid Countermeasures
耿立军 1刘峰 1冮鹏 1董新柔 2刘伟 3李博佳3
作者信息
- 1. 中海石油(中国)有限公司天津分公司,天津 300452
- 2. 中海油能源发展股份有限公司,天津 300452
- 3. 中国石油大学(北京)油气资源与探测国家重点实验室,北京 102249
- 折叠
摘要
Abstract
Well drilling in the central part of the block Jinzhou-25-1 in Bohai basin has frequently encountered borehole wall destabilization when drilling the Dongying formation shales.Based on the analyses of the components and structure of the shales as well as the measurement of their mechanical properties,it was found that the borehole wall destabilizes mainly in two mechanisms,first is the weakening of the shales caused by hydration and swelling,second is the shearing slip of the formations along the bedding planes.Based on this understanding,a water based drilling fluid PEM and a synthetic based drilling fluid BIODRILL S were compared for their performance from several aspects such as basic properties,plugging capacity,inhibitive capacity and the ability to maintain mechanical strength of a formation etc.It was found that the BIODRILL S drilling fluid has several advantages over the PEM drilling fluid,such as high percentage of shale cuttings recovery in hot rolling test,lower linear expansion rate,lower high temperature high pressure filtration rate as well as better performance in maintaining the mechanical strength of the shale formations.A nano-latex plugging agent PF-NSEAL was added into the BIODRILL S drilling fluid at concentrations between 2%and 2.5%,rendering it better microfracture plugging performance.In field operation,the optimized BIODRILL S drilling fluid was used to drill two extended reach wells,the number of downhole problems was greatly reduced,and the drilling rate was increased by 43.7%.The use of the optimized BIODRILL S synthetic based drilling fluid has provided a technical support for solving the borehole wall destabilization problem encountered in block Jinzhou-25-1.关键词
锦州25-1区块/泥页岩/井壁失稳/钻井液/封堵性Key words
Block Jinzhou-25-1/Mud shale/Borehole wall destabilization/Drilling fluid/Plugging property分类
石油、天然气工程引用本文复制引用
耿立军,刘峰,冮鹏,董新柔,刘伟,李博佳..渤海盆地锦州25-1区块中部泥岩地层井壁失稳机理及钻井液对策[J].钻井液与完井液,2025,42(1):58-65,8.
