In preparation for directional drilling, a wedge supported distally ahead of a tubular drill string is advanced along a parent hole. The wedge is connected to the drill string by a rigid link that extends along a central longitudinal axis through an annular cutting head. The wedge may be connected to the drill string via an inner dropper mechanism that can be engaged by a wireline lifting system. After locking the wedge at a kick-off point in the hole at a desired azimuth, the connection of the link is broken. The dropper mechanism can then be retrieved and replaced by an inner core tube, without moving the drill string. The drill string is then advanced to drill a daughter hole that branches from the parent hole on the azimuth determined by the wedge. Advantageously, there is no need to withdraw the drill string before drilling the daughter hole can commence.

A wireline conveyed, gas driven setting tool configured to set downhole tools including, without limitation, frac plugs, bridge plugs, cement retainers and packers. The setting tool is functioned by selectively igniting a power charge inside of a firing head. As the power charge burns, it generates gas that acts upon a piston area to stroke the setting tool. A dampening media, as well an optimized flow area at or near the distal end of the setting tool, act to slow the setting stroke.

A plug assembly includes an expandable assembly, a locking ring and a cup. The expandable assembly is adapted to be deformed radially over the locking ring and the cup. The locking ring has a stopping inner surface. The plug assembly is used with one or more untethered objects, the untethered objects having an outer surface adapted to couple with the cup, and the cup having an outer surface adapted to couple with the stopping inner surface of the locking ring. The combination of cup and untethered objects is also adapted to contact an inner surface of the plug assembly and, using well fluid pressure, to apply forces to the plug assembly. The forces cause the longitudinal movement of the cup and untethered objects while contacting the inner surface of the plug assembly until the cup contacts the stopping inner surface of the locking ring.

A technique facilitates setting of a liner hanger in a casing or within other tubular structures via a setting tool. The liner hanger may be constructed with an expandable hanger body between fixed ends. The expandable hanger body is formed from a material, e.g. metal, sufficiently ductile to undergo plastic deformation as it is expanded into engagement with a surrounding casing or other tubing. The expandable hanger body is expanded via fluid delivered under high pressure by the setting tool. The setting tool has a pressure booster to achieve the desired high pressure. The pressure booster may be in the form of a multi-diameter piston constructed to establish the desired high pressure during a single stroke.

A system and method set a liner hanger in a borehole by actuating a hydraulic setting mechanism on the hanger to engage slips in the borehole. A setting tool runs the hanger into position. A reserve volume of the tool holds a clean fluid separate from the borehole. A piston of the tool has a tool volume for the fluid. During run in, pressure in the tool volume is balanced to hydrostatic pressure by drawing actuation fluid from the reserve volume to the tool volume through a check valve. To set the hanger, a plug is engaged on a seat in the tool, tubing pressure is applied behind the engaged plug, and the seat is unlocked. With more applied pressure, the piston moves, reduces the tool volume, and intensifies pressure of the clean fluid communicated to the hanger's setting mechanism. Over-pressure can be handled by a venting valve.

A hydrostatic module interlock for a downhole tool including a piston having fingers extending from a body thereof, a piston mandrel telescopically arranged with the piston, and a retaining piston disposed to prevent finger deflection in the first position and allow finger deflection in the second position. A method for actuating an interlocked tool including loading a release configuration to a threshold force, releasing the release configuration, moving a retaining piston out of a first position wherein the retaining piston physically impedes deflection of a finger of a piston, deflecting the finger out of engagement with a piston mandrel telescopically arranged relative to the piston, and moving the piston relative to the piston mandrel. A borehole system including a borehole in a subsurface formation, a string disposed in the borehole, and a hydrostatic module interlock disposed within or as a part of the string.

A well tool for removing metal debris from a well bore has a magnet element, an anti-torque anchor, a debris removal unit, a debris container and a first connecting end for a rotatable well string. The magnet element has a cylinder-shaped housing. The removal unit has a helix-shaped longitudinal guide element arranged on the housing. The anchor is connected to the housing or the guide element such that actuation of the anchor during use will prevent rotation of the housing or the guide element, respectively, relative the well-bore. The container has an opening at the end of the housing. The housing and the guide element are rotatable relative each other, and configured such that metal debris accumulating on the housing during use is guided by the guide element towards the opening of the container when the anchor is actuated and the first connecting end is rotated.

In preparation for directional drilling, a wedge supported distally ahead of a tubular drill string is advanced along a parent hole. The wedge is connected to the drill string by a rigid link that extends along a central longitudinal axis through an annular cutting head. The wedge may be connected to the drill string via an inner dropper mechanism that can be engaged by a wireline lifting system. After locking the wedge at a kick-off point in the hole at a desired azimuth, the connection of the link is broken. The dropper mechanism can then be retrieved and replaced by an inner core tube, without moving the drill string. The drill string is then advanced to drill a daughter hole that branches from the parent hole on the azimuth determined by the wedge. Advantageously, there is no need to withdraw the drill string before drilling the daughter hole can commence.

A system and method set a liner hanger in a borehole by actuating a hydraulic setting mechanism on the hanger to engage slips in the borehole. A setting tool runs the hanger into position. A reserve volume of the tool holds a clean fluid separate from the borehole. A piston of the tool has a tool volume for the fluid. During run in, pressure in the tool volume is balanced to hydrostatic pressure by drawing actuation fluid from the reserve volume to the tool volume through a check valve. To set the hanger, a plug is engaged on a seat in the tool, tubing pressure is applied behind the engaged plug, and the seat is unlocked. With more applied pressure, the piston moves, reduces the tool volume, and intensifies pressure of the clean fluid communicated to the hanger's setting mechanism. Over-pressure can be handled by a venting valve.

The present invention relates to a downhole tool string for displacing at least a tool section in a well in a radial direction in a wall of a well tubular metal structure extending along an axial direction in relation to the radial direction, comprising a tool body having an outer face and a tool centre axis along the axial direction, a centre plane extending along and enclosing the centre axis, dividing the tool body into a first body half and a second body half, an operational machining tool for performing a machining operation in the well tubular metal structure, such as drilling a hole in the wall, and extendable from the outer face of the first body half in a first radial direction in relation to the tool centre axis, and a first displacement element extendable from the outer face of the second body half of the tool body for displacing the tool body towards the wall for arranging the operational machining tool close to the wall, the first displacement element being extendable between a retracted position and a projected position, wherein the downhole tool string further comprises a first distancing element extendable from the outer face of the first body half, the first distancing element having a retracted position and a projected position, and in the projection position of the first distancing element a distance is provided between the outer face and the wall of the well tubular metal structure. Moreover the present invention also relates to a downhole system.