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华英参1井是塔里木华北风险区块上的第一口参数井,要求钻井液既要适应地层情况,保证顺利完钻,又要能及时发现和保护油气层.全井以聚合物一聚磺钻井液体系为基础,然后针对不同井段地层特点及施工要求及时加入各种必需的聚合物处理剂,并将聚合物处理剂配成胶液进行性能维护。进入三开井段后向体系内加入油溶性树脂和超细碳酸钙形成屏蔽暂堵式钻井液,实现了正压封堵,负压解堵,暂堵率达80％;并根据随钻地层孔隙压力监测值控制钻井液密度附加值在0.04—0.07之间,实现近平衡钻井。该井井下正常,施工顺利,从进入油气层到下尾管前通井,先后起下钻16趟,历时56d,每次下钻都一次到底,循环后效异常活跃,最高全烃含量达到90％,油气层得到了很好的保护。
Huayinggai 1 well is the first parameter well on North China Tarim block, requiring both drilling fluid to adapt to stratigraphy, to ensure smooth completion of drilling, and to discover and protect oil and gas layers in time. Sulfur drilling fluid system as the basis, and then for different intervals of strata characteristics and construction requirements timely accession to all necessary polymer treatment agent, and the polymer treatment agent formulated into a glue for performance maintenance. Into the three open section after the oil-soluble resin and ultra-fine calcium carbonate into the system to form a temporary shield blocking drilling fluid, to achieve a positive pressure blocking, negative pressure plugging, temporary plugging rate of 80%; and according to drilling while strata Pore pressure monitoring value control drilling fluid density added value between 0.04-0.07, to achieve near equilibrium drilling. Well downhole normal, the construction goes well, from entering the oil and gas to the lower tail pipe before the well, has drilled 16 times, lasted 56d, each drill once in the end, abnormal circulation after the exception, the highest total hydrocarbon content of 90 %, The reservoir has been well protected.