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板深7井是大港油田板桥古潜山构造的一口重点超深探井,完钻井深5191.96m。诙井针对不同的地层采用不同的钻井液体系。二开选用聚合物钻井液和相应的技术措施,有效地抑制了地层造浆;三开选用硅基防塌钻井液,性能保持低粘度、低切力、高动塑比,利于携砂、脱气,具有良好的流变性和防塌性;四开实施欠平衡钻井技术,采用无固相钻井液体系。现场应用表明,在清水中加入1％的碱式碳酸锌、0.2％的缓蚀剂和适量烧碱,用可溶性盐来调节钻井液密度,防止了二氧化碳、硫化氢对钻具的腐蚀,保护了油气层,满足了欠平衡钻井的施工要求。
Well Banshen7 is a key ultra-deep exploration well constructed in Banqiao buried hill in Dagang Oilfield, with a drilling depth of 5191.96m. Humorous for different strata using different drilling fluid system. The second choice of polymer drilling fluid and the corresponding technical measures to effectively inhibit the formation of slurry; three open use of silicon-based anti-collapse drilling fluid, performance to maintain low viscosity, low shear, high plastic ratio, which will help carry sand, off Gas, with good rheology and anti-collapse; Fourth, the implementation of under-balanced drilling technology, the use of solid-free drilling fluid system. The field application shows that adding 1% of basic zinc carbonate, 0.2% of corrosion inhibitor and proper amount of caustic soda to the clear water, using the soluble salt to adjust the drilling fluid density, preventing the carbon dioxide and hydrogen sulfide from corroding the drilling tools and protecting the oil and gas Layer, to meet the construction requirements of underbalanced drilling.