南海东部浅层大位移井聚合物钻井液优化研究与应用  

Optimization research and application of polymer drilling fluid in shallow extended reach wells in the eastern South China Sea

作　　者：马积贺 马太银 杨波[1] 姚磊[1] 凌江涛 MA Jihe;MA Taiyin;YANG Bo;YAO Lei;LING Jiangtao(Shenzhen Operation Company of COSL Oilfield Chemicals Division,Shenzhen 518000,Guangdong,China)

机构地区：[1]中海油田服务股份有限公司油田化学事业部深圳作业公司,广东深圳518000

出　　处：《能源化工》2024年第3期57-61,共5页Energy Chemical Industry

摘　　要：南海东部恩平油田浅层大位移井钻遇层位浅,地层胶结疏松,泥岩含量高,钻井过程中存在钻井液增稠、井壁失稳、循环当量密度升高诱发井漏、摩阻扭矩大等问题。优选了低分子量酰胺基聚合物PF-BIOCAP、胺基聚合物PF-UHIB和硼酸酯复合植物油PF-EXLUBE以改善聚合物钻井液包被抑制性、造浆抑制性和润滑性。评价结果表明,优化后钻井液泥岩滚动回收率达到96%,经(w)15%泥岩钻屑污染后表观黏度上升率明显下降,摩擦系数和泥饼黏滞系数均低于0.1,表现出优异的抑制性和润滑性,且流变性能满足井眼清洁要求。该聚合物钻井液体系在恩平油田浅层大位移井中取得了良好的应用效果,解决了泥岩井壁失稳、泥岩岩屑造浆和高摩阻扭矩等技术难题,对海上浅层大位移井的推广应用具有指导意义。Enping Oilfield is located in the eastern South China Sea,where shallow extended reach wells encounter loosely cemented formations with high mudstone content,prone to easy hydration,dispersion,and slurry formation.During the drilling process,challenges arise,including drilling fluid thickening,wellbore instability,induced well leakage due to an increase in circulating equivalent density,and high friction torque.A careful selection of additives are made to address these challenges,including the low molecular weight amide-based polymer PF-BIOCAP,amine-based polymer PF-UHIB,and borate ester compound vegetable oil PFEXLUBE,aimed at improving the inhibitive and lubricating properties of polymer drilling fluid.Evaluation results demonstrate that the mudstone rolling recovery rate of the drilling fluid reaches 96%.After contamination by mudstone cuttings with mass fraction of 15%,the apparent viscosity increase rate has significantly decreased.Moreover,both the friction coefficient and mudcake viscosity coefficient are maintained below 0.1,which show excellent inhibitive and lubricating properties.The rheological performance meets the requirements for wellbore cleanliness.This polymer drilling fluid system has shown significant success in shallow extended reach wells in Enping Oilfield,effectively addressing technical challenges such as mudstone wellbore instability,mudstone cuttings hydration and slurry formation,and high friction torque.Its successful application in shallow offshore extended reach wells holds valuable guidance for widespread adoption.

关 键 词：浅层大位移井 聚合物钻井液 抑制性 润滑性 

分 类 号：TE254[石油与天然气工程—油气井工程]