CAJ | 학술논문

罗681井是罗家鼻状构造带罗68断块的一口评价井，完钻井深3860 m．该区块地质构造复杂，施工过程中先后钻遇沙三断层、盐膏层、高压油气层、地下水层及沙四段等多套压力体系，经常出现井壁坍塌、井漏和井喷等复杂情况，施工难度和风险系数都比较大．通过使用聚合物防塌钻井液体系和聚磺防塌钻井液体系，配合相应的泥浆工艺和工程技术措施，预防了复杂情况的发生，施工中井壁稳定，井下安全，井径规则，满足了施工要求，也为本区块其它井的施工提供了详实的工艺参数．
라681정시라가비상구조대라68단괴적일구평개정，완찬정심3860 m．해구괴지질구조복잡，시공과정중선후찬우사삼단층、염고층、고압유기층、지하수층급사사단등다투압력체계，경상출현정벽담탑、정루화정분등복잡정황，시공난도화풍험계수도비교대．통과사용취합물방탑찬정액체계화취광방탑찬정액체계，배합상응적니장공예화공정기술조시，예방료복잡정황적발생，시공중정벽은정，정하안전，정경규칙，만족료시공요구，야위본구괴기타정적시공제공료상실적공예삼수．
Luo 681 well is an appraisal well , and is located in Luo Jiabi tectonic zone .The total depth is 3,860 m.The geologic structure is so complex that faulted formation , salt bed, elevated pressure hydrocarbon reservoir , water layer and sha forth section were drilled .So wellbore instability , lost circulation and blowout fre-quently occurred .The field operation was very difficult .After polymer anti-caving drilling fulid and sulphonated polymer &anti-caving drilling fluid were applied , complex circumstance was avoided by corresponding mud tech-niques and onsite technology .The borehole wall was stable and downhole was safe during the course of drilling . The borehole gauge was regular and consistent , which meet the requirement of field operation .At last, the suc-cess of exploration was helpful to explore the oilfield further .