Patent ID: 11892093
Assignee: BAKER HUGHES OILFIELD OPERATIONS LLC
Field: Mechanical elements (Mechanical engineering)
Classification: CPC F | IPC E  F

Claim 17:
18. A device for generating pressure pulses, the device comprising:
a borehole string in a borehole, the borehole string having a bore defining a fluid passageway;
a fluid circulating though the borehole;
a bottom hole assembly in the borehole string including a valve member disposed in the fluid passageway, the fluid passageway including a restriction, the valve member movable by an actuator relative to the restriction to generate a pressure pulse in the fluid in the fluid passageway based on varying a relative position between the valve member and the restriction and creating a differential pressure across the fluid passageway, the differential pressure applying a first force on the valve member; and
a piston member in hydraulic communication with the differential pressure, the piston member having an end extending through an opening in the fluid passageway, the differential pressure applying a second force on the piston member, the piston member having a locomotive connection to the valve member, wherein all of the fluid circulating through the borehole passes through the restriction and the opening.