A method of transmitting an electrical signal between a downhole device and a surface location is provided, the method including unwinding a flexible hose from a reel at the surface location and deploying the hose down a wellbore, wherein the downhole device is attached at a downhole end of the flexible hose, providing a conductive fluid inside the flexible hose as an electrical path, and transmitting the electrical signal through the conductive fluid from one of the downhole device and the surface location to the other of the downhole device and the surface location.

A circulating downhole tool utilising a variable fluid pressure regulated cycle valve device that can be attached to the borehole assembly BHA of a coiled tubing and used down an offshore or onshore wellbore is disclosed. The circulating downhole tool utilising a variable fluid pressure regulated cycle valve device can be remotely operated by an operator on the surface as many times as required in either the through-flow, intermediary or circulatory modes-of-operation, by simply varying the drilling fluid flow rate and pressure being supplied from the pump located on the surface and interconnected to the coiled tubing and the BHA that will include the circulating downhole tool utilising a variable fluid pressure regulated cycle valve device.

A circulating downhole tool utilising a variable fluid pressure regulated cycle valve device that can be attached to the borehole assembly BHA of a coiled tubing and used down an offshore or onshore wellbore is disclosed. The circulating downhole tool utilising a variable fluid pressure regulated cycle valve device can be remotely operated by an operator on the surface as many times as required in either the through-flow, intermediary or circulatory modes-of-operation, by simply varying the drilling fluid flow rate and pressure being supplied from the pump located on the surface and interconnected to the coiled tubing and the BHA that will include the circulating downhole tool utilising a variable fluid pressure regulated cycle valve device.

A pressure control valve for a downhole drilling system includes a choke body and a restrictor body. The choke body is installed in the bore of a housing. A fluid flow flows through an orifice in the choke body Changing a distance between the choke body and the restrictor body changes a pressure differential uphole of the pressure control valve.

A pressure control valve for a downhole drilling system includes a choke body and a restrictor body. The choke body is installed in the bore of a housing. A fluid flow flows through an orifice in the choke body Changing a distance between the choke body and the restrictor body changes a pressure differential uphole of the pressure control valve.

A flow control assembly including a subassembly including an annular safety valve, a shroud, a bushing connecting the shroud to the subassembly at one of two opposing ends of the shroud, and another bushing connecting the shroud to the subassembly at the other of the two opposing ends of the shroud. The method for operating a hydrogen storage and production system including pumping hydrogen into the salt cavern for storage through a borehole and producing hydrogen from the salt cavern through the same borehole.

A flow control assembly including a subassembly including an annular safety valve, a shroud, a bushing connecting the shroud to the subassembly at one of two opposing ends of the shroud, and another bushing connecting the shroud to the subassembly at the other of the two opposing ends of the shroud. The method for operating a hydrogen storage and production system including pumping hydrogen into the salt cavern for storage through a borehole and producing hydrogen from the salt cavern through the same borehole.

Cup tester unit comprising a BOP test plug insertable into a casing head housing, for sealing a space of drilling systems above the BOP test plug; a hanger connected to the lower end of the BOP test plug; and a test cup assembled at the outer circumference of the hangers, for sealing with the inner surface of a well casing. Further, a method of testing a of drilling systems and a connection between a well casing and a casing head housing is claimed.

A frac sleeve system includes a well casing with a tubular wall having a frac port defined there through for hydraulic fracturing. A sleeve within the well casing includes a sleeve body. The sleeve is mounted for axial movement relative to the tubular wall of the well casing among three positions including: a closed position in which the sleeve body blocks the frac port, a frac position in which the sleeve body clears the frac port so the frac port is open for hydraulic fracturing there through, and a production position in which the sleeve at least partially blocks the frac port.

A frac sleeve system includes a well casing with a tubular wall having a frac port defined there through for hydraulic fracturing. A sleeve within the well casing includes a sleeve body. The sleeve is mounted for axial movement relative to the tubular wall of the well casing among three positions including: a closed position in which the sleeve body blocks the frac port, a frac position in which the sleeve body clears the frac port so the frac port is open for hydraulic fracturing there through, and a production position in which the sleeve at least partially blocks the frac port.