The present invention concerns a drive module (10′, 10″, 10″′, 10″″) for a wellbore tractor (1). Each drive module (10′, 10″, 10″′, 10″″) comprises a drive module housing (13) and a hydraulically actuated and pivoting drive unit (11) comprising an arm housing (11′) and two drive wheels (12′, 12″) arranged thereto. The drive wheels (12′, 12″) are driven by a motor (16) mounted inside the arm housing (11′). The drive wheels (12′, 12″) are drivingly connected to the motor (16) via a drive line comprising a worm gear drive rrangement (14). The invention teaches also a wellbore tractor (1) comprising at least one of said drive modules (10′, 10″, 10″′, 10″″).

The present invention concerns a drive module (10′, 10″, 10″′, 10″″) for a wellbore tractor (1). Each drive module (10′, 10″, 10″′, 10″″) comprises a drive module housing (13) and a hydraulically actuated and pivoting drive unit (11) comprising an arm housing (11′) and two drive wheels (12′, 12″) arranged thereto. The drive wheels (12′, 12″) are driven by a motor (16) mounted inside the arm housing (11′). The drive wheels (12′, 12″) are drivingly connected to the motor (16) via a drive line comprising a worm gear drive rrangement (14). The invention teaches also a wellbore tractor (1) comprising at least one of said drive modules (10′, 10″, 10″′, 10″″).

A method and apparatus are disclosed that use a control line to expand a piston that shears pins to disconnect a latching system for wellbore operations.

A bottom hole assembly (BHA) includes a whipstock having a latch release mechanism and a milling tool having a plurality of blades and a lock mechanism. The BHA also includes a collar coupled to the whipstock and disposed about a portion of the milling tool, wherein the blades of the milling tool abut the collar. The milling tool is releasably coupled to the whipstock by the interaction of the latch release mechanism and the lock mechanism.

A bottom hole assembly (BHA) includes a whipstock having a latch release mechanism and a milling tool having a plurality of blades and a lock mechanism. The BHA also includes a collar coupled to the whipstock and disposed about a portion of the milling tool, wherein the blades of the milling tool abut the collar. The milling tool is releasably coupled to the whipstock by the interaction of the latch release mechanism and the lock mechanism.

An interchangeable module configured to be used in an integrated perforating gun and setting tool system, the interchangeable module having a body having a chamber, a first electrical connection located at a first end of the chamber, and a second electrical connection located at a second end of the chamber. The first end is opposite to the second end. An addressable switch located inside the chamber, the addressable switch has a digital address. A connection unit located inside the chamber and configured to electrically connect the addressable switch to an initiating device. The interchangeable module is configured to be used (1) between a first gun cluster and a second gun cluster and (2) between a distal gun cluster and a setting tool, and the first and second electrical connections are electrically connected to the addressable switch.

A system, such as a bottom hole assembly, having a central body (18), at least one hydrostatically-actuatable assembly (50) configured to extend radially outward from the central body (18), the hydrostatically-actuatable assembly (50) having at least one N piston body (76) exposed to hydrostatic pressure; a plurality of passive structures (54), each of which is: configured to extend radially outward from the central body (18); and circumferentially spaced from the at least one hydrostatically-actuatable assembly (50) and another one of the plurality of passive structures.

A system, such as a bottom hole assembly, having a central body (18), at least one hydrostatically-actuatable assembly (50) configured to extend radially outward from the central body (18), the hydrostatically-actuatable assembly (50) having at least one N piston body (76) exposed to hydrostatic pressure; a plurality of passive structures (54), each of which is: configured to extend radially outward from the central body (18); and circumferentially spaced from the at least one hydrostatically-actuatable assembly (50) and another one of the plurality of passive structures.

A well cutting tool, comprising a housing including a chamber, the housing having at least one nozzle, the chamber being loaded with thermite, and a gas-generating additive an ignitor such that when the ignitor is actuated to ignite the thermite, the gas-generating additive is caused to create an increase in pressure which discharges energised molten thermite from the chamber and out of the housing through the at least one nozzle.

Provided is a communications sub. The communications sub, in one aspect, includes a fluid chamber, and a pressure-activated indexing device positioned within the fluid chamber, the pressure-activated indexing device including a lock mandrel configured to incrementally move between an engaged state and a disengaged state when subjected to two or more pressure cycles. The communications sub, in accordance with one aspect, further includes a latch body positioned in the fluid chamber, the latch body configured to be fixed in place by the lock mandrel and close a fluid path from the fluid chamber to a control line when the lock mandrel is in the engaged state, and configured to be allowed to move and open the fluid path from the fluid chamber to the control line when the lock mandrel is in the disengaged state.