DOWNHOLE ANCHORING APPARATUS

摘要

An anchoring apparatus for engaging a borehole surface includes an anchoring member, an actuator, a fluid chamber, and an intensifier piston within a housing. The intensifier piston includes a first end having a surface area greater than a second, the second end being in communication with the fluid chamber, such that application of pressure to the first end applies a second pressure, greater than the first, to fluid in the chamber, which is in turn applied to the actuator to extend the anchoring member toward the borehole surface with intensified force. A second intensifier piston and fluid chamber can be included and used to apply intensified pressure to the actuator to retract the anchoring member. A movable mandrel within the housing can be used to physically apply a physical force to one or both intensifier pistons in place of or in addition to fluid pressure.

主权项

1. An anchoring apparatus for engaging a borehole surface, the apparatus comprising:
a housing; an anchoring member within the housing, wherein the anchoring member is movable between a retracted position within the housing and an extended position in which at least a portion of the anchoring member is positioned external to the housing for engaging the borehole surface; an actuator in communication with the anchoring member and operable to move the anchoring member between the retracted position and the extended position; a first fluid chamber within the housing and in communication with the actuator; and a first intensifier piston comprising a first end in communication with a fluid source and a second end in communication with the first fluid chamber, wherein the first end of the first intensifier piston comprises a surface area greater than that of the second end of the first intensifier piston, wherein fluid from the fluid source applies a first pressure to the first intensifier piston to move the first intensifier piston in a first direction, wherein movement of the first intensifier piston in the first direction applies a second pressure to fluid in the first fluid chamber, wherein the second pressure is greater than the first pressure, and wherein the second pressure applies force to the actuator to cause the actuator to urge the anchoring member toward the extended position.