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发明公开
CN101680278A 用于钻探井孔的系统 无效 - 撤回

用于钻探井孔的系统
摘要：
提供一种用于向地层中钻探钻孔的系统，其包括：设置在钻孔中的套管，延伸通过套管内部到达钻孔下端部分的钻柱，和延伸进入套管内的钻探流体主体，在利用钻柱钻探钻孔的过程中，所述套管的内表面由于与钻柱外表面的摩擦接触而易于磨损。所述系统还包括用于减少所述套管内表面摩损的设施，所述设施包括在所述套管内表面上的硬化层、在钻柱外表面上的减摩擦层和包含在钻探流体主体内的润滑复合物中的至少一种。
摘要（英）：

A system is provided for drilling a borehole into an earth formation, comprising a casing arranged in the borehole, a drill string extending through the interior of the casing to a lower end portion of the borehole, and a body of drilling fluid extending into the casing, the casing having an inner surface susceptible of wear due to frictional contact with an outer surface of the drill string during drilling of the borehole with the drill string. The system further comprises means for reducing wear of said inner surface of the casing, said means including at least one of a hardened layer at theinner surface of the casing, a friction-reducing layer at the outer surface of the drill string, and a lubricating compound contained in the body of drilling fluid.

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