Actuator Device

Abstract

An actuator device for moving a tool within a borehole in the ground, the actuator being positioned between a coiled tubing and a tool, and the actuator being arranged to move the tool at a substantially constant axial speed and the actuator including a motor-operated mandrel which is moved outwards in the actuator by means of a releasable nut, the nut being locked in its active position by means of a hydraulically operated locking piston.

1 . An actuator for moving a tool within a borehole in the ground, the actuator positionable between a coiled tubing and a tool, and the actuator being arranged to move the tool at a substantially constant axial speed, the actuator comprising:
 an actuator housing with an internal cylinder jacket and an end wall;   a releasable nut being arranged at the end wall, engaging, in its active position, a threaded bored-through mandrel, the mandrel projecting, axially movable, through an opening in the end wall;   a motor being arranged to rotate the mandrel about its longitudinal axis via a non-circular, axially bored-through shaft   a locking piston, movable in the cylinder jacket, surrounding the mandrel, the locking piston being arranged to lock, when it is in its end position nearest to the end wall, the nut in its active position;   an inner through opening defined in the wall of the shaft communicating with a first space defined in the actuator housing upstream relative to the locking piston when the mandrel is in its retracted position within the actuator housing; and   an outer through opening defined in the wall of the mandrel, communicating with a second space defined between the locking piston and the end wall when the mandrel is in its extended end position.   
   
   
       2 . The actuator of  claim 1  wherein the locking piston includes releasable locking dogs fitting complementarily into a locking groove in the cylinder jacket, a second piston being provided with a releaser which is arranged to release the locking dogs when the second piston is near the locking piston. 
   
   
       3 . The actuator of  claim 1  wherein the mandrel includes a second piston which is sealingly movable within the cylinder jacket, whereby fluid flowing through the outer through opening is arranged to move the second piston and mandrel in the inward direction within the actuator housing. 
   
   
       4 . The actuator of  claim 1  wherein the mandrel is connected to a spring which is arranged to move the mandrel inwards within the actuator housing. 
   
   
       5 . The actuator of  claim 1  wherein the mandrel is connected to a gas spring which is arranged to move the mandrel inwards within the actuator housing. 
   
   
       6 . The actuator of  claim 1  wherein the motor is pressure-fluid-operated. 
   
   
       7 . The actuator of  claim 1  wherein the motor is in the actuator housing. 
   
   
       8 . The actuator of  claim 1  wherein the motor is at least partially outside the actuator housing. 
   
   
       9 . The actuator of  claim 2  wherein the mandrel includes the second piston which is sealingly movable within the cylinder jacket, whereby fluid flowing through the outer through opening is arranged to move the second piston and mandrel in the inward direction within the actuator housing.