Wellbore Enhancing Technology for 444.5 mm Openhole Section in Well SHBP1 by Means of Drilling Fluid Optimization
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摘要: 针对顺北蓬1井二开444.5 mm长裸眼井段钻遇的三叠系泥岩地层易水化膨胀和井眼失稳，二叠系巨厚火成岩地层裂缝孔隙发育、易发生掉块垮塌和井漏等问题，研究了井筒强化钻井液技术。在分析三叠系地层井眼失稳机理及二叠系地层井漏原因的基础上，制定了防塌防漏技术对策，优选了抑制剂SMJA-1、防塌剂SMNA-1和封堵剂SMGF-1等关键处理剂，构建了强抑制强封堵钻井液体系。现场应用显示，二开钻进期间，钻井液性能稳定，泥岩钻屑棱角分明、完整度高；裸眼段井眼稳定，起下钻顺畅；钻井时间逾90 d，平均井径扩大率仅4.7%。应用效果表明，以强抑制强封堵钻井液及配套施工工艺为核心的井筒强化钻井液技术，能有效解决顺北蓬1井三叠系地层井眼失稳与二叠系地层井漏的问题，并可为后续顺北区块类似井的钻井提供借鉴。Abstract: We developed a wellbore enhancing technology by means of drilling fluid optimization to tackle the problems of hydration,swelling and wellbore instability of Triassic mudstone strata encountered by the 444.5 mm open hole section in Well SHBP1,as along with a number of additional drilling-related problems such as well-developed fracture pores,collapse/caving and leakage,and other drilling issues in the massive Permian igneous strata.Countermeasures designed to prevent collapse and leakage were proposed and developed,based on the analysis of mechanisms contributing to wellbore instability when drilling the Triassic formation and those causing leakage in the Permian strata.We incorporated key additives such as inhibitor SMJA-1,anti-collapse agent SMNA-1 and plugging agent SMGF-1 to develop the strong inhibition/blocking drilling fluid system.Field applications showed that during the second spud drilling,the performance of drilling fluid was stable,and mudstone cuttings were characterized by sharp edges and completeness.When the operations followed the new protocols,the open hole section was stable,the trip operation was smooth,and the average wellbore expansion rate was only 4.7% for over 90 days of drilling.Field testing the application and analyzing the results suggest that it is possible to solve wellbore instability by incorporating a strong inhibition/plugging drilling fluid.In addition,the technology solves wellbore instability in Triassic strata and leakage issues in Permian strata of Well SHBP1.This technology could provide reference for subsequent drilling in similar wells in Shunbei Block.
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