钻井液与完井液2025，Vol.42Issue(5)：587-593,7.DOI:10.12358/j.issn.1001-5620.2025.05.003
渤海浅层大位移井合成基钻井液自适应高承压封堵剂
A Self-Adaptable High Pressure Bearing Plugging Agent for Synthetic-Based Drilling Fluid in Shallow Extended-Reach Well Drilling in Bohai
摘要
Abstract
The direction in which the properties of the self-adaptable high pressure bearing plugging agent are specifically optimized is understood by analyzing the lost circulation scenarios occurring in shallow extended-reach well drilling in Bohai area,that is,the formations penetrated by the wells have high heterogeneity as well as pores and fractures that are randomly distributed,and lost circulation materials have to effectively plug the pores and fractures with unknown sizes to stop mud losses.The formations penetrated have microfractures that are extremely developed and low pressure bearing capacities,and lost circulation materials must have high compressive strengths.To overcome these difficulties,an oil-absorbing self-adaptable high-pressure bearing plugging agent OBR-1 was synthesized with methyl methacrylate as the backbone and other monounsaturated fatty acid esters with different of carbon chain lengths.Experimental results show that OBR-1 has high volume expansion capacity at rubbery state,high elastic modulus after absorbing oils,good broad-spectrum plugging effect and high pressure bearing capacity.Sand disks of 10-120 μm plugged by a synthetic-based emulsion containing 2%OBR-1 have pressure bearing capacity of 10 MPa.A synthetic-based drilling fluid formulated with OBR-1 as the core material can plug 20-80 mesh sand-beds with pressure bearing capacities of 20 MPa,proving that OBR-1 has excellent pressure bearing capacity and plugging performance,and can provide guarantee for the safe and efficient drilling of offshore extended-reach wells.关键词
渤海浅层/合成基钻井液/承压封堵Key words
Shallow formation in Bohai/Synthetic-based drilling fluid/Pressure bearing plugging分类
能源科技引用本文复制引用
刘宝生,汤柏松,霍宏博,张俊,侯欣欣,贺垠博,王奕杰..渤海浅层大位移井合成基钻井液自适应高承压封堵剂[J].钻井液与完井液,2025,42(5):587-593,7.基金项目
中海石油(中国)有限公司科技项目"渤海油田稳产3000万吨,上产4000万吨关键技术研究"子课题"莱州湾浅层6000米大位移井钻完井技术研究与示范"(CNOOC-KJ135ZDXM36TJ06TJGD202201)部分研究成果. （中国）
