A method of operating a subsea production system (1), the system comprising a subsea tree (2) connected to a subsea well (3), a production tubing (4) in the well (3), and an electrically operable electric downhole safety valve (5), wherein the method comprises, in case of malfunction in operation of the electric downhole safety valve (5), the steps of installing a hydraulically operable insert hydraulic downhole safety valve (6) within the production tubing (4); connecting the insert hydraulic downhole safety valve (6) to the fluid line (10) at a point of setting (7) in the subsea well (3); operating the insert hydraulic downhole safety valve (6) by using the fluid line (10) which extends from an input port (11) at a position outside of the subsea tree (2).

A gas-lift system and method, of which the gas-lift system includes a first valve configured to be coupled to a production tubing, a second valve configured to be coupled to the production tubing at a position that is subjacent to the first valve, and a control line coupled to the first valve and the second valve, and configured to apply a control line pressure to the first and second valves, the control line pressure applied by the control line being independent of an annulus pressure in the annulus and a production tubing pressure in the production tubing. The first valve is configured to actuate at least partially in response to the control line pressure, and the second valve is configured to actuate at least partially in response to the control line pressure.

The present invention relates to a downhole inflow production restriction device for mounting in an opening in a well tubular metal structure arranged in a wellbore, the downhole inflow production restriction device comprising a device opening, and a brine dissolvable element configured to prevent flow from within the well tubular metal structure through the device opening to an outside of the well tubular metal structure before being at least partly dissolved in brine, wherein the brine dissolvable element is at least partly made of a magnesium alloy. The present invention also relates to a downhole completion system and to a completion method.

The present invention relates to a downhole inflow production restriction device for mounting in an opening in a well tubular metal structure arranged in a wellbore, the downhole inflow production restriction device comprising a device opening, and a brine dissolvable element configured to prevent flow from within the well tubular metal structure through the device opening to an outside of the well tubular metal structure before being at least partly dissolved in brine, wherein the brine dissolvable element is at least partly made of a magnesium alloy. The present invention also relates to a downhole completion system and to a completion method.

A tubing pressure insensitive failsafe wireline retrievable safety valve including a tool housing, a flow tube disposed within the tool housing, an actuation piston disposed in the tool housing and operably connected to the flow tube, the actuation piston having an actuation pressure side and a relatively lower pressure chamber side, a fluid pathway between a potential leak site for the valve and the relatively lower pressure chamber side of the piston. A borehole system having a tubing pressure insensitive failsafe wireline retrievable safety valve. A tubing pressure insensitive failsafe wireline retrievable safety valve.

Method and apparatus for creating a fluid communication line in a downhole environment between an annular chamber and a throughbore of a tool. The tubular wall therebetween is provided with circumferentially arranged recesses extending into the wall to provide selected thin-walled sections for perforation by a communication tool. The communication tool has two oppositely arranged punch heads, one aligned with a recess and the other between neighbouring recesses giving an orientationless configuration in operation. An embodiment for creating a fluid communication line through a tubing retrievable safety valve for operation of a wireline retrievable safety valve located therein is described.

The invention relates to the oil industry and the production of oil. An insert safety valve is mounted inside a piping safety valve in a production tubing string and comprises a housing having a longitudinal bore, an upper landing assembly with extendable slips for fixing inside the piping safety valve having a landing nipple, a hydraulic line, annular seals and a valve device with a spring-driven element. The insert safety valve is mounted on a carrying cable, the hydraulic line has tubes connected to two valves. The first valve is connected to the piping safety valve housing in the production tubing string, and the second valve extends to a port in the inner portion of the landing nipple. A hollow sleeve functions as a moving element, and the valve device is formed as openings in the sleeve and in the housing, wherein the openings are configured to being aligned.

A gas-lift system and method, of which the gas-lift system includes a first valve configured to be coupled to a production tubing, a second valve configured to be coupled to the production tubing at a position that is subjacent to the first valve, and a control line coupled to the first valve and the second valve, and configured to apply a control line pressure to the first and second valves, the control line pressure applied by the control line being independent of an annulus pressure in the annulus and a production tubing pressure in the production tubing. The first valve is configured to actuate at least partially in response to the control line pressure, and the second valve is configured to actuate at least partially in response to the control line pressure.

A surface-controlled wireline-retrievable safety valve includes a seat housing having a plurality of flow ports that is configured to house a hard seat. A closure device has a plurality of equalization ports, is disposed within the seat housing, and is configured to controllably move off the hard seat and expose the plurality of flow ports to a central lumen of the safety valve under hydraulic actuation. A power piston having a shoulder portion includes a top end that is attached to the closure device and the shoulder portion is disposed within a hydraulic chamber housing forming a differential area. A hydraulic actuation port may be configured to receive hydraulic actuation fluid from a surface pump. A hydraulic passage may be configured to convey the hydraulic actuation fluid from the hydraulic actuation port to the differential area via a hydraulic access port.

The invention relates to the oil industry and the production of oil. An insert safety valve is mounted inside a piping safety valve in a production tubing string and comprises a housing having a longitudinal bore, an upper landing assembly with extendable slips for fixing inside the piping safety valve having a landing nipple, a hydraulic line, annular seals and a valve device with a spring-driven element. The insert safety valve is mounted on a carrying cable, the hydraulic line has tubes connected to two valves. The first valve is connected to the piping safety valve housing in the production tubing string, and the second valve extends to a port in the inner portion of the landing nipple. A hollow sleeve functions as a moving element, and the valve device is formed as openings in the sleeve and in the housing, wherein the openings are configured to being aligned.