Abstract: Taking the new polyether polyatomic alcohol SYP-1 as the main agent,the coater,filtrate reducer and shale-control agent of polymer were optimally selected to develop a new drilling fluid.The properties including inhibition,mud filtrate control capacity,rheology,lubricity and formation protection ability of the new drilling fluid were evaluated in laboratory.The functional mechanism of the drilling fluid was briefly investigated.The field tests were made in LN3-6H Well and HD4-23H Well.During the process of drilling,the borehole wall was stable,and the hole diameter was regular.The electric logging,casing running and cementing operation were successful.Laboratory tests and field application indicate that this kind of drilling fluid has the advantages of excellent inhibition,lubricity,anti-sloughing,formation protection properties and convenience for field maintenance and treatment.The successful application demonstrates that the polyether polyatomic alcohol drilling fluid can meet the requirements of drilling in complex formation.

Key words: polyether polyatomic alcohol drilling fluid, lubricity, rheology, borehole stability, formation protection, field test

摘要： 以新研制的多功能聚醚多元醇SYP-1为主剂,对聚合物包被剂、防塌剂和降滤失剂进行了优选实验.在此基础上,研制了一种新型的聚醚多元醇钻井液.对聚醚多元醇钻井液的抑制性、流变性、滤失造壁性、润滑性以及对油气层的保护性能进行了室内评价实验,并分析了该钻井液的作用机理.在LN3-6H井和HD4-23H井进行的聚醚多元醇钻井液现场试验表明,在钻进过程中井壁稳定,井径规则,起、下钻畅通,井下安全,测井、下套管及固井作业顺利.室内实验和现场应用表明,聚醚多元醇钻井液具有优良的防塌性和润滑性,能有效地抑制岩屑分散,起到稳定井壁和保护油气层的作用,满足复杂地质条件下钻井的需要.

关键词: 聚醚多元醇钻井液;润滑性;流变性;井眼稳定性;油气层保护;现场试验