Method and apparatus for slowing back spin of a rod string...

Details Method and apparatus for slowing back spin of a rod string... Method and apparatus for slowing back spin of a rod string...

F - Mech Eng,Light,Heat,Weapons

04

B

F04B 49/06 (2006.01) E21B 43/16 (2006.01) F04B 47/02 (2006.01) F04B 49/02 (2006.01) H02P 3/00 (2006.01)

Patent

CA 2161504

A method and apparatus for slowing back spin of a rod string of a progressing cavity pump powered by an electric motor when power is lost. Pulse direct current voltage into the windings of the electric motor powering the progressing cavity pump to magnetize a stator of the electric motor thereby reducing the rotational speed of a rotor of the electric motor and consequently the rotational speed of the back spinning rod string of the progressing cavity pump.

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