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Study on high density oil-based drilling fluid and its application for liner running in Well Dongqiu-8
Author(s): 
Pages: 13-16
Year: Issue:  6
Journal: DRILLING FLUID & COMPLETION FLUID

Keyword:  油基钻井液抗高温防井漏井眼净化压差卡钻;
Abstract: 东秋8井是塔里木油田的一口重点预探井.该井在4772~5301 m井段的钻井过程中因砂岩层渗透性好、油气层压力系数高,发生了多次井漏、溢流和压差卡钻等复杂事故,决定完钻,下入ψ127 mm尾管.为避免下尾管时出现压差卡钻等复杂情况,通过研究分析,优选出了高密度油基钻井液进行下尾管和固井作业.该钻井液抗温抗压能力强,性能稳定,与井浆配伍性好,经高温静置后,具有较高的携屑悬浮能力.现场应用表明.高密度油基钻井液密度范围宽、滤失量低、泥饼薄、泥饼的粘附系数小、高温高压稳定性好;能够大幅度降低泥饼的粘附系数,适合于深井超深井易发生压差卡钻井段测井、下套管等施工;东秋8井小眼井顺利下入尾管,固井作业顺利,解决了东秋8井下入尾管发生压差卡钻的难题,经济效益非常明显.
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