Patent ID: 9574406
Date: 2017-02-21
CPC Classifications: E21B

Claim:
1. A completion system comprising: a fluid powered reaction turbine coupled to a reaming tool, the reaming tool configured for coupling to a completion string insertable into a borehole, the completion string comprising at least one fluid pressure activated element, wherein the turbine is configured to be powered using fluid supplied at a pressure below an activation pressure of the at least one fluid pressure activated element, wherein the reaction turbine comprises at least one stator element and at least one rotor element, the at least one stator element and the at least one rotor element having a plurality of circumferentially spaced apart blades, a curvature, a pitch, a circumferential spacing between blades and a number of blades being such that a pressure drop across the reaction turbine when the motor is stalled is maximized, and wherein the pressure drop across the reaction turbine is smaller when the motor is stalled than when the motor is rotating.