Rotating progressing cavity pump

The progressive cavity pump consists of a rotating cork-screw like sub-surface assembly which is driven by a surface mounted motor. Beam pump rods are used to connect the two. The flowrate achieved is mainly a function of the rotational speed of the subsurface assembly. There Is in principle very little that can go wrong with progressive cavity pumps. Progressive cavity pumps excel in low productivity shallow wells with viscous crude oils and can also handle significant quantities of produced solids. 

Finally, the progressive cavity pump uses a rotating member inside a molded cylinder that together form a cavity that moves from input to output as the centre is rotated. This pump can handle very viscous oils and debris, but is heavy and more expensive than other types of pumps. 

The group of rotating positive displacement pumps comprises a lot of different versions. When setting a borderline for high-pressure usabUity at 10 MPa, only the gear pumps (70 MPa), the screw pumps (32 MPa), and the progressing cavity pumps (15 MPa) remain. The basic conveying characteristics of these pumps can be... 

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