罗布泊盐湖深部钾盐科学钻探2号井钻完井工艺

Drilling and completion technology of No.2 Well of deep potash scientific drilling in Lop Nur salt lake

罗布泊盐湖深部钾盐科学钻探2号井(LDK02孔)完井深度为1200 m,是罗布泊盐湖区第一口深部钾盐参数井。通过对松散层取心、高矿化度卤水钻井液、闭合定深取样技术的成功应用,解决了卵砾石层及砂层取心、粘土层井段易缩径卡钻,钻井液盐浸井壁掉块不稳定、坍塌等恶性孔内事故。同径止水工艺简化了钻孔结构;定深取样技术保持水样原组分相对稳定,对研究本区不同深度富钾卤水分布及时空演变奠定了基础。

Lop Nur salt lake deep potash scientific drilling Well 2(LDK02)has a completion depth of 1200m,which is the first deep potash parameter well in Lop Nur salt lake district.The successful application of loose layer coring,high salinity brine drilling fluid,and closed depth sampling technology has solved malignant wellbore accidents such as easy shrinkage and sticking of drilling in gravel and sand layer coring,unstable block falling and collapse of drilling fluid salt immersion wellbore.The same diameter sealing process simplifies the drilling structure;The fixed depth sampling technology maintains the relative stability of the original components of the water sample,laying the foundation for studying the distribution and spatiotemporal evolution of potassium rich brine at different depths in this area.