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.
螺杆钻具的高转速可以为PD C钻头提高切削速度提供井下动力保障。
High rotate speeds of dynamical drilling tools can improve PDC bit's cutting rates, and also can provide downhole motives.
井下减速器属于井下动力工具涡轮钻具的配套设备，也可用于采油领域，目前国内尚处于研制阶段。
Underwell reducer, categorized as downhole tools of turbodrill supporting equipment, is now still in the research and development stage. It can also be used in oil extraction fields.
井下减速器属于井下动力工具涡轮钻具的配套设备，也可用于采油领域，目前国内尚处于研制阶段。
Underwell reducer, categorized as downhole tools of turbodrill supporting equipment, is now still in the research and development stage. It can also be used in oil extraction fields.
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