设计调制式旋转导向钻井工具控制阀的关键问题之一是上盘阀高压孔的设计。
One of the key problems of designing the control valve of modulation rotary steering drilling tool is the design of high pressure hole of upside valve.
但在超深井钻井过程中，面临地层高温、高压、产出流体相态复杂，这对环空携岩和安全是一个严峻的考验。
During ultra deep well drilling, we will be confronted with high temperature, high pressure and complex produced fluid.
钻井（水）龙头由于结构设计的原因，冲管盘根在钻井过程中不断磨损，特别是在高压泥浆的作用下，盘根密封常常被破坏。
The wash pipe packing of drilling swivel showed wear-and-tear continually in drilling process due to its structural design.
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