Patent ID: 9540877
Date: 2017-01-10
CPC Classifications: E21B,F01C,F04C

Claim:
1. A valve for controlling the flow of a drilling fluid through a downhole tool positionable in a wellbore penetrating a subterranean formation, the downhole tool comprising a drill bit at an end thereof and a drilling motor, the drilling motor comprising a housing with a rotor movable in a rotor channel in the housing as the drilling fluid passes therethrough, the rotor having a bypass channel for bypassing a portion of the drilling fluid therethrough, the valve comprising: a valve plate positionable upstream of the motor, the valve plate having at least one flow passage and at least one bypass passage therethrough, the at least one flow passage in fluid communication with the rotor channel for passing the drilling fluid therethrough whereby the rotor is rotatable in the housing, the at least one bypass passage in selective fluid communication with the bypass channel when the rotor moves about the housing and the bypass channel selectively moves into and out of alignment with at least a portion of the at least one bypass passage for bypassing a portion of the drilling fluid therethrough whereby a hammering effect is generated on the bit.