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贝克孔底钻进马达包括螺杆钻和涡轮钻。这里仅对螺杆钻作一介绍。贝克螺杆钻是由钻井泥浆或清水驱动的正排量液压马达。当液体泵入钻具时，钻头以一个与流量成正比的转速回转，并且不论负荷或产生的功率如何都保持相对稳定。贝克螺杆钻除了具有一般的优点之外（如：减少钻具和套管磨损；回转功率直接驱动钻头；受控倾斜孔钻进；快速定向钻进等等），它比其它孔底钻进马达具有三个重要的优点：
Baker hole drilling motors include screw drills and turbine drills. Here only an introduction to the screw rod. Baker screw drills are positive displacement hydraulic motors driven by drilling mud or clear water. As liquid is pumped into the drill, the drill bit is rotated at a speed proportional to the flow rate and remains relatively stable regardless of load or power generated. In addition to the general advantages of Baker screw drills (eg reduction of tool and casing wear; rotary power direct drive drill bits; controlled inclined hole drilling; rapid directional drilling, etc.), it drills motors more than other hole bottoms Has three important advantages: