钻井液与完井液2025，Vol.42Issue(4)：509-515,7.DOI:10.12358/j.issn.1001-5620.2025.04.010
川西海相长水平井白油基钻井液技术研究与应用
Research and Application of White Oil-Based Drilling Fluid Technology for Long Horizontal Wells in Western Sichuan
摘要
Abstract
In order to address the challenges of annular blockage and borehole instability during the drilling process of long horizontal wells in western Sichuan,this study analyzed the geological characteristics of the formation.Experimental research was conducted to understand the mechanism behind borehole instability.The findings revealed that in sea-related geological formations in Western Sichuan Basin,the risk of borehole instability is higher in the direction of minimum principal stress compared to that of maximum principal stress.The reservoir rock exhibits hard brittleness,fractured formations,developed microfractures,poor interlayer cementation,and a tendency for drilling cuttings deposition leading to annular blockage.Under pressure excitation,fractures further expand causing borehole instability.Based on these findings,flow type stabilizer SMRS-1 was developed.Emulsifying agents and nano-micron sealing agent SMNR-2 were carefully selected to construct a high-temperature long-term stable white oil-based drilling fluid system.After 7 days of rolling aging at 160℃,this system exhibited good high-temperature long-term stability with a dynamic viscosity ratio≥0.20 and a high-temperature high-pressure filtration loss<4.0 mL at 160℃along with breakdown voltage>600 V.The successful application of this drilling fluid in well PZ5-3 effectively resolved issues related to an-nular blockage and borehole instability encountered during long horizontal well drilling operations within western Sichuan.关键词
川西气田/长水平井/井壁失稳/提切剂/油基钻井液Key words
Western Sichuan gas field/Horizontal wells/Borehole instability/Flow type stabilizer/Oil-based drilling fluid分类
能源科技引用本文复制引用
韩子轩,韩秀贞,王显光,李大奇,黄河淳,陈晓飞..川西海相长水平井白油基钻井液技术研究与应用[J].钻井液与完井液,2025,42(4):509-515,7.基金项目
深地国家科技重大专项项目"重点地区深部热能探测评价"(2024ZD1003600). （2024ZD1003600）
