Apparatus and methods utilizing progressive cavity motors and pumps with independent stages

摘要

A drilling apparatus includes a progressive cavity device that includes a plurality of linearly coupled rotors. Each rotor is disposed in a separate stator. Adjoining stators are separated by a coupling device configured to provide lateral support to the rotors. The stators may be enclosed in a common housing. The adjoining stator sections may be rigidly connected to each other.

主权项

1. An apparatus for use in a wellbore, comprising:
a plurality of serially coupled power sections, wherein each power section includes a rotor disposed in a stator; and a coupling device configured to couple stators of adjoining power sections, wherein the coupling device includes a first end fastened to an outside of the stator of a first of the adjoining power sections and a second end fastened to an outside of the stator of a second of the adjoining power sections to provide a lateral support to the rotors of the adjoining power sections.