The present invention relates to a fluid-operated percussion drill tool comprising an outer wear sleeve comprising a substantially cylindrical wall and having inner and outer surfaces. The tool also comprises a percussion bit having a head portion and a bit retaining portion and located at a forward end of the outer wear sleeve. The tool further comprises a sliding piston mounted for reciprocating movement within the outer wear sleeve to strike the percussion bit. The tool also includes a drive ring having a substantially cylindrical wall and comprising connection means adapted for connecting the drive ring to a drive means of the fluid-operated percussion drill tool. At least one flushing channel provides a fluid path to the cutting face of the bit for a flushing medium. A first portion of the at least one flushing channel extends longitudinally within the wall of the wear sleeve, a second portion of the at least one flushing channel extends longitudinally within the wall of the drive ring and a third portion of the at least one flushing channel extends through the head portion of the percussion bit to the cutting face of the bit.

A device for generating pressure waves in a well or a wellbore. The device includes a housing containing an impact-generating mechanism for generating the pressure waves and a connector for connecting the housing to a conveyor for transporting the device to any desired location within the well or the wellbore. The device may be used for a number of downhole applications such as cleaning perforations, fracturing processes, vibration of a casing to prevent fluid flow in a cemented annulus, hydraulic jar operations for freeing stuck downhole objects, generating data to optimize pumping parameters and as an enhancement to percussion drilling techniques.

A drilling rig and methods are provided for using multiple types of drilling when installing geothermal systems. The drilling rig can perform sonic drilling such as percussive sonic drilling and a type of non-sonic drilling. Control switching valves are added to the hydraulics of the drilling rig to selectively provide sufficient flow of hydraulic fluid to motors used in the multiple types of drilling, depending on which type of drilling is currently most efficient for the underground formation being drilled. The water pump and hydraulic motor for such have been designed to handle both types of drilling on a small drilling rig frame, thereby allowing for the drilling to occur in space-constrained environments. A method of recycling water used to remove cuttings during drilling to put back downhole is also provided.

A drilling rig and methods are provided for using multiple types of drilling when installing geothermal systems. The drilling rig can perform sonic drilling such as percussive sonic drilling and a type of non-sonic drilling. Control switching valves are added to the hydraulics of the drilling rig to selectively provide sufficient flow of hydraulic fluid to motors used in the multiple types of drilling, depending on which type of drilling is currently most efficient for the underground formation being drilled. The water pump and hydraulic motor for such have been designed to handle both types of drilling on a small drilling rig frame, thereby allowing for the drilling to occur in space-constrained environments. A method of recycling water used to remove cuttings during drilling to put back downhole is also provided.

The invention relates to a rotary device (101) for a down-the-hole hammer (1), which rotary device is accommodated in a rotation motor housing (3) and mounted behind a drill housing (2) for transferring a torque to a drill bit (8) and a pressurized drive fluid (22) to a striking mechanism (4) for the drill bit. The rotary device includes a cam curve with a plurality of drive lobes (28:1-28:3) and working chambers (30:1, 30:2, 30:3) along a circumference in the rotation motor housing (3), a rotor disc (38) carrying a plurality of radially movable vanes (40:1-40:12), which are accommodated in piston tracks (41:1-41:12) in the rotor disc. Characteristics of the rotary device are that it includes; an odd integer of a number of drive lobes (28:1-28:3), which is equal to or higher than three; an odd integer of a number of working chambers (30:1, 30:2, 30:3), which is equal to or higher than three; an odd integer of a number of vanes (40:1-40:12), which is equal to or higher than three, and wherein said number of vanes are simultaneously pressurized in each working chamber (30:1, 30:2, 30:3).

The invention relates to a rotary device (101) for a down-the-hole hammer (1), which rotary device is accommodated in a rotation motor housing (3) and mounted behind a drill housing (2) for transferring a torque to a drill bit (8) and a pressurized drive fluid (22) to a striking mechanism (4) for the drill bit. The rotary device includes a cam curve with a plurality of drive lobes (28:1-28:3) and working chambers (30:1, 30:2, 30:3) along a circumference in the rotation motor housing (3), a rotor disc (38) carrying a plurality of radially movable vanes (40:1-40:12), which are accommodated in piston tracks (41:1-41:12) in the rotor disc. Characteristics of the rotary device are that it includes; an odd integer of a number of drive lobes (28:1-28:3), which is equal to or higher than three; an odd integer of a number of working chambers (30:1, 30:2, 30:3), which is equal to or higher than three; an odd integer of a number of vanes (40:1-40:12), which is equal to or higher than three, and wherein said number of vanes are simultaneously pressurized in each working chamber (30:1, 30:2, 30:3).

The present disclosure is directed to a mud hammer mud hammer comprising: a piston barrel including at least one exhaust port configured to receive a single flow of drilling fluid including drilling mud; a piston positioned within the piston barrel and configured to move in a reciprocating motion operated by a first portion of the drilling fluid; a bypass tube disposed through the piston and in fluid communication with a drill bit; an adjustable valving set configured to divert a second portion of the drilling fluid into the bypass tube; and a wear sleeve positioned to prevent contact between the piston and the piston barrel; wherein the second portion of the drilling fluid diverted into the bypass tube is exhausted from the drill bit and the first portion of drilling fluid is exhausted from the piston barrel via the exhaust port, in a direction away from the drill bit.

The present disclosure is directed to a mud hammer mud hammer comprising: a piston barrel including at least one exhaust port configured to receive a single flow of drilling fluid including drilling mud; a piston positioned within the piston barrel and configured to move in a reciprocating motion operated by a first portion of the drilling fluid; a bypass tube disposed through the piston and in fluid communication with a drill bit; an adjustable valving set configured to divert a second portion of the drilling fluid into the bypass tube; and a wear sleeve positioned to prevent contact between the piston and the piston barrel; wherein the second portion of the drilling fluid diverted into the bypass tube is exhausted from the drill bit and the first portion of drilling fluid is exhausted from the piston barrel via the exhaust port, in a direction away from the drill bit.

A hydraulic breaking hammer and method of supporting a percussion piston is provided. The breaking hammer includes a percussion device provided with a reciprocating piston. The piston is supported on a frame at its end portions by a first piston bearing element and a second piston bearing element. The second piston bearing element includes a collar sealing element facing towards a working collar of the piston. The piston bearing elements are easily mountable and dismountable separate components.

A hydraulic breaking hammer and method of supporting a percussion piston is provided. The breaking hammer includes a percussion device provided with a reciprocating piston. The piston is supported on a frame at its end portions by a first piston bearing element and a second piston bearing element. The second piston bearing element includes a collar sealing element facing towards a working collar of the piston. The piston bearing elements are easily mountable and dismountable separate components.