Motor and rotor catch assembly

摘要

A motor and rotor catch assembly for preventing loss of broken motor parts downhole. The assembly comprises a motor including a rotor supported inside a stator housing. A rotor bolt is connected to the upper end of the rotor, and is supported for axial movement within a rotor bolt housing from a running position to a deployed position. If the stator housing breaks or backs off, the attached rotor bolt shifts to the deployed position. In the deployed position, the bolt substantially reduces flow to the stator housing and simultaneously opens bypass ports to vent fluid to the annulus instead. In this way, the rotor is prevented from spinning rapidly, the diverted fluid creates a pressure change that alerts the operator to the motor failure, and the diverted fluid allows continued removal of debris and cuttings from the well bore.

主权项

1. A motor and rotor catch assembly comprising:
a motor comprising a stator housing and a rotor supported for rotation inside the stator housing in response to fluid flow through the stator housing, wherein each of the stator housing and rotor has an uphole end; a tubular rotor bolt housing having an uphole end, a downhole end, and body extending therebetween, the body defining a sidewall, and the downhole end being attachable to the uphole end of the stator housing; a rotor bolt having a downhole end connected to the uphole end of the rotor; wherein the rotor bolt is supported for axial movement in the rotor bolt housing from a running position to a deployed position, wherein the rotor bolt and rotor bolt housing are configured so that in the running position fluid can flow through the rotor bolt housing and the stator housing, and so that in the deployed position fluid flow through the rotor bolt housing is diverted outside the assembly through the sidewall of the rotor bolt housing and so that fluid flow into the stator housing is substantially obstructed.