The field test indicates that characterized by flexible switching and reliable sealing, the new drilling valve can improve the efficiency of connecting individual pipe whi…
现场试验表明，钻井阀开关灵活，密封可靠，提高了气体钻井时接单根的效率和作业的安全性，测斜时不碰、挂测斜仪。
The field test indicates that characterized by flexible switching and reliable sealing, the new drilling valve can improve the efficiency of connecting individual pipe whi…
现场试验表明，钻井阀开关灵活，密封可靠，提高了气体钻井时接单根的效率和作业的安全性，测斜时不碰、挂测斜仪。
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