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膨润土钻井液深钻技术在渤海某油田的应用

wf(2015)

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Abstract
通过分析渤海某油田的沉积环境、地质油藏概况和优化井身结构及井眼轨迹,优选钠基膨润土,添加增黏剂、烧碱和纯碱等添加剂提高动、静切力和确保pH值大于10,并在淡水配制后让充分水化形成的膨润土钻井液深钻至馆陶组(垂深2000 m左右),实现了快速钻进,钻速由50~70 m/h提高至90~100 m/h,扩大了上部井段的井径(由?342.9 mm扩至?374.65 mm)、减少了起下钻和下套管作业的阻卡风险,而且节约了钻井液成本,形成了渤海油田降本增效和钻井提效典型技术。
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