The invention relates to a method of conducting a perf wash cement (“P/W/C”) abandonment job in an offshore oil or gas well annulus (2), in particular the washing or cementing operation using a rotating head (6, 8) with nozzles (7, 9) dispensing wash fluid or cement at pressure. Certain values of parameters of a washing or cementing job have been found surprisingly to affect the quality of the job, or the degree to which they affect the quality of the job has been unexpected. These include including rotation rate of the tool, the direction of translational movement of the tool, and the volume flow rate and pressure per nozzle of cement or wash fluid (and hence nozzle size).

A single trip liner running and tie-back system includes a liner string to case a formation, a polished bore receptacle installed in a liner hanger, and a tie back casing string to tie back the liner string to a wellhead. The tie back casing string is fit with a seal assembly comprised of a no-go stopper, and the seal assembly of the tie back casing string is anchored inside the polished bore receptacle of the liner hanger to run the liner string and the tie back casing string in tandem.

A single trip liner running and tie-back system includes a liner string to case a formation, a polished bore receptacle installed in a liner hanger, and a tie back casing string to tie back the liner string to a wellhead. The tie back casing string is fit with a seal assembly comprised of a no-go stopper, and the seal assembly of the tie back casing string is anchored inside the polished bore receptacle of the liner hanger to run the liner string and the tie back casing string in tandem.

Gadolinium- or boron-doped drilling mud is used during drilling so that it will penetrate all natural cracks in the formation that intersect with the wellbore. Once cased, cemented and washed, the doped mud will only be in the fractures. Pulsed neutron logging is performed, and natural factures thereby characterized.

A method and apparatus for operating a debris removal tool. In one embodiment, the tool includes a cover assembly having a plurality of covers spaced from one another along the length of the assembly creating a gap between adjacent covers. A carrier disposed within the cover assembly is axial movable relative thereto and has a plurality of magnet groups spaced from one another along its length. In an unactuated position of the tool, each of the plurality of magnet groups is under one of the plurality of covers and in an actuated position, each of the plurality of magnets is in a gap between covers.

A method and apparatus for operating a debris removal tool. In one embodiment, the tool includes a cover assembly having a plurality of covers spaced from one another along the length of the assembly creating a gap between adjacent covers. A carrier disposed within the cover assembly is axial movable relative thereto and has a plurality of magnet groups spaced from one another along its length. In an unactuated position of the tool, each of the plurality of magnet groups is under one of the plurality of covers and in an actuated position, each of the plurality of magnets is in a gap between covers.

A well case brushing and surge blocking apparatus includes a housing, a frame, an actuating arm, a gear assembly, a hydraulic motor, a hydraulic speed controller, and a hydraulic counterbalance. The housing is laterally connected to the frame. The gear assembly is laterally mounted to the frame and positioned opposite of the housing. The actuating arm is positioned within the housing as a stator of the hydraulic motor is externally mounted to the gear assembly, and a rotor of the hydraulic motor and the actuating arm is torsionally coupled with each other through the gear assembly. The hydraulic speed controller and the hydraulic counterbalance are mounted to the frame. The hydraulic motor is in fluid communication with the hydraulic speed controller and the hydraulic counterbalance so that a sand line of rig can be looped and operated through the well case brushing and surge blocking apparatus.

A well case brushing and surge blocking apparatus includes a housing, a frame, an actuating arm, a gear assembly, a hydraulic motor, a hydraulic speed controller, and a hydraulic counterbalance. The housing is laterally connected to the frame. The gear assembly is laterally mounted to the frame and positioned opposite of the housing. The actuating arm is positioned within the housing as a stator of the hydraulic motor is externally mounted to the gear assembly, and a rotor of the hydraulic motor and the actuating arm is torsionally coupled with each other through the gear assembly. The hydraulic speed controller and the hydraulic counterbalance are mounted to the frame. The hydraulic motor is in fluid communication with the hydraulic speed controller and the hydraulic counterbalance so that a sand line of rig can be looped and operated through the well case brushing and surge blocking apparatus.

The present invention relates to a system for launching robots for use in oil and gas production wells, comprising a supporting structure (2), on which robot-launching tubing (4) is arranged; a dynamic seal (12) attached to the inlet end of the robot-launching tubing (4), which seals off the umbilical cable (8); an annular BOP valve (3) to restrict upward flow; and a ram BOP valve (7) at the other end of the tubing (4), to restrict upward flow and having a large enough opening to allow the robot to pass through, sealing off the umbilical cable (8). The system can be detached from the duct, used for transporting the robot, it can be flexible in terms of different configurations, and it can have a system that allows inertization of blocked lines. The present invention is used for introducing robots that operate internally in flexible and rigid ducts, with it being necessary to connect the tubing system to the equipment developed. Once connected, and by operating the valves of the system, it is possible to introduce the robot into the tubing.

The present invention relates to a system for launching robots for use in oil and gas production wells, comprising a supporting structure (2), on which robot-launching tubing (4) is arranged; a dynamic seal (12) attached to the inlet end of the robot-launching tubing (4), which seals off the umbilical cable (8); an annular BOP valve (3) to restrict upward flow; and a ram BOP valve (7) at the other end of the tubing (4), to restrict upward flow and having a large enough opening to allow the robot to pass through, sealing off the umbilical cable (8). The system can be detached from the duct, used for transporting the robot, it can be flexible in terms of different configurations, and it can have a system that allows inertization of blocked lines. The present invention is used for introducing robots that operate internally in flexible and rigid ducts, with it being necessary to connect the tubing system to the equipment developed. Once connected, and by operating the valves of the system, it is possible to introduce the robot into the tubing.