CPC E21B 34/066 (2013.01) [E21B 34/14 (2013.01); E21B 47/18 (2013.01); E21B 2200/06 (2020.05)] | 20 Claims |
19. A method of operating a control valve assembly in a wellbore comprising:
activating a solenoid to create a magnetic field in a magnetic circuit having a gap;
passing the magnetic field across the gap in the magnetic circuit; and
sliding a sleeve mounted to a body with the magnetic field thereby narrowing the gap, the sleeve sliding from a first position covering one of a fluid inlet and a fluid outlet to a second position uncovering one of the fluid inlet and the fluid outlet to produce a pressure pulse in the wellbore, wherein the body is formed from a first magnetic material, and wherein at least a portion of the sleeve is made from a second magnetic material.
|