井下动力钻具（downhole motor）是指能把钻井液的能量转化为钻井破岩动力的井底钻具,如,涡轮钻具、单螺杆钻具、电动钻具等.由于井下动力钻具(井底马达)具有高转速,可以显著提高机械钻速,特别是与PDC钻头配合使用将大大地提高钻井速度。
... mud mixing appliance 配泥浆的设备 mud motor 井下动力钻具 mud motor-bent sub 泥浆马达-弯接头 ...
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可用于转盘钻或井下动力钻具。
注气欠平衡钻水平井技术面临的两大技术难题是井下动力钻具不能正常工作和常规MWD无法正常工作。
The two technical problems faced by the technology of under-balanced horizontal well drilling with gas injection are the down-hole motor and the conventional MWD can't work normally.
同时由于从井口到井底始终存在着连续的液相流，常规井下动力钻具和随钻仪器的性能不受影响，可以进行正常的井眼轨迹控制。
Meanwhile, the downhole motor and MWD are not affected and wellbore trajectory can be controlled because of the continuous fluid phase flow throughout the bore hole.
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