钻井液与完井液2024，Vol.41Issue(2)：191-197,7.DOI:10.12358/j.issn.1001-5620.2024.02.008
红星区块多粒径致密封堵油基钻井液技术
An Oil-Based Drilling Fluid with Varied Particle Size Plugging Agents for Use in the Borehole Collapse and Mud Loss Coexisting Wells in Hongxing Block
摘要
Abstract
The Hongxing block,a main gas production area of the Jianghan oilfield in the Jiannan structure,is an important shale gas development area of Sinopec.After many years of development,the matrix stresses of the Feixianguan formation and the Changxing formation become very low,and the Wujiaping formation is highly developed with nanometer-sized fractures and fissures.When drilling with oil-based drilling fluids,mud losses and borehole wall collapse take place frequently and are difficult to deal with.To solve these problems,an oil-based drilling fluid with particles of varied sizes to form dense plugging is developed.This oil-based drilling fluid is characterized with strong plugging capacity,low activity,low viscosity and high gel strengths.It is formulated with 4%nanometer-and micrometer-sized rigid particles,0.5%graphene flake material,1.5%spherical gelled MPA,1%ultra-fine mineral fibers.These materials work together to plug and seal the micrometer-sized and nanometer-sized fractures in the formations and coat the borehole wall with dense mud cakes,thereby controlling the high temperature high pressure filter loss of the drilling fluid below 3 mL.High concentration CaCl2 solution(≥36%)as the water phase of the oil-based drilling fluid lowers the activity of the drilling fluid to below that of the formation waters and thus improves the inhibitive capacity of the drilling fluid.The emulsifier used has the ability to increase the gel strengths of the drilling fluid to the required level,hence effectively carrying the drilled cuttings and the sloughing out of hole.In field operation,this drilling fluid effectively mitigates the severity of mud losses and borehole wall collapse.An obvious application result is that the time spent in dealing with downhole troubles is reduced by 90.34%.关键词
红星区块/油基钻井液/多粒径/致密封堵/塌漏同存Key words
Hongxing block/Oil-base drilling fluid/Varied particle sizes/Densely plugging/Coexistence of borehole collapse and mud loss分类
能源科技引用本文复制引用
王长勤,李忠寿,黄桃,李广林,张勇,魏士军..红星区块多粒径致密封堵油基钻井液技术[J].钻井液与完井液,2024,41(2):191-197,7.基金项目
中石化石化油服项目"红星区块油基钻井液防漏堵漏技术应用研究"(SG23-15K). （SG23-15K）
