泥浆马达

    螺杆钻具，又称定排量马达，是一种容积式井下动力钻具。由于其本身结构和性能方面的一系列特点和优点，所以自 20 世纪 50 年代中期问世以来，在石油钻井和修井方面获得了广泛应用，同时也被用于地质勘探、煤层气开采、建筑管道施工和国防工程等方面的钻进作业。

    Downhole Motors，alse known as fixed displacement motor, is a positivedisplacement downhole drilling tools. By its very structure and propertiesof a range if characteristics and advantages, in the mid-50s of the 20th century ,it is used in oil drilling and workover widely, and in geologicalexploration,coal seam gas exploration,pipeline construction and defenseconstruction engineering, drilling operations.