An actuator sub for generating hydraulic pressure having a sub housing which includes (i) an outer surface, (ii) a main flow passage extending though the sub housing, and (iii) a wall space formed between the main flow passage and the housing outer surface. At least a first hydraulic tube is position in the wall space and an equalization port is configured to transmit pressure in the main flow passage to the first hydraulic tube. A drive motor driving an bi-directional hydraulic motor, are positioned in the first hydraulic tube, with the hydraulic motor being configured to output fluid to a fluid outlet of the first hydraulic tube, and the hydraulic motor, when not under power, allowing the reverse flow of fluid through the hydraulic motor. The actuator sub includes the absence of a check valve along a path carrying fluid between the hydraulic motor and the outlet of the second hydraulic tube.

An actuator sub for generating hydraulic pressure having a sub housing which includes (i) an outer surface, (ii) a main flow passage extending though the sub housing, and (iii) a wall space formed between the main flow passage and the housing outer surface. At least a first hydraulic tube is position in the wall space and an equalization port is configured to transmit pressure in the main flow passage to the first hydraulic tube. A drive motor driving an bi-directional hydraulic motor, are positioned in the first hydraulic tube, with the hydraulic motor being configured to output fluid to a fluid outlet of the first hydraulic tube, and the hydraulic motor, when not under power, allowing the reverse flow of fluid through the hydraulic motor. The actuator sub includes the absence of a check valve along a path carrying fluid between the hydraulic motor and the outlet of the second hydraulic tube.

An insert safety valve includes a valve body having a valve member, and a control fluid conduit fluidically connected to the valve body. The insert safety valve being responsive to a control fluid at a first pressure to shift the valve member and open the valve body to a fluid flow and at a second pressure to add the control fluid to the fluid flow.

An insert safety valve includes a valve body having a valve member, and a control fluid conduit fluidically connected to the valve body. The insert safety valve being responsive to a control fluid at a first pressure to shift the valve member and open the valve body to a fluid flow and at a second pressure to add the control fluid to the fluid flow.

A downhole deployment and isolation system may be used to deploy a completion string, service the well, and isolate the lower completion string, optionally in a single trip. The lower completion string may be run into the well with a valve in an open condition, such as a ball valve propped open by a mandrel. The mandrel may be operable to both disconnect the work string from the lower completion string and to close the valve upon disconnecting such as by removing the mandrel from the ball. The valve may be remotely reopened with fluid pressure form surface.

A downhole deployment and isolation system may be used to deploy a completion string, service the well, and isolate the lower completion string, optionally in a single trip. The lower completion string may be run into the well with a valve in an open condition, such as a ball valve propped open by a mandrel. The mandrel may be operable to both disconnect the work string from the lower completion string and to close the valve upon disconnecting such as by removing the mandrel from the ball. The valve may be remotely reopened with fluid pressure form surface.

A gas control valve has a valve housing, a gas flowpath, a piston, a valve seat, a valve body, an actuating chamber, and a stack of Belleville washers. The valve housing has a gas inlet, a gas outlet, and a control fluid inlet. The gas flowpath runs from the gas inlet to the gas outlet. The piston reciprocates away from and towards a normal position. The valve body is coupled to the piston and is adapted to selectively seat on the valve seat to open and shut the gas flowpath. The actuating chamber communicates with the control fluid inlet. The washer stack is under compression to bias the piston in the normal position. The piston is responsive to fluid pressure in the actuating chamber and the washer stack so that the valve may be selectively opened and closed by sequentially increasing and decreasing pressure in the actuating chamber.

A gas control valve has a valve housing, a gas flowpath, a piston, a valve seat, a valve body, an actuating chamber, and a stack of Belleville washers. The valve housing has a gas inlet, a gas outlet, and a control fluid inlet. The gas flowpath runs from the gas inlet to the gas outlet. The piston reciprocates away from and towards a normal position. The valve body is coupled to the piston and is adapted to selectively seat on the valve seat to open and shut the gas flowpath. The actuating chamber communicates with the control fluid inlet. The washer stack is under compression to bias the piston in the normal position. The piston is responsive to fluid pressure in the actuating chamber and the washer stack so that the valve may be selectively opened and closed by sequentially increasing and decreasing pressure in the actuating chamber.

A fluid diverter tool, system and method of diverting a fluid flow in a in a well, having: a tubular mandrel and a packer element affixed onto an exterior thereof and operable to sealingly engage an inside of a pipe body to divert a flow of a treatment fluid outwards through holes formed in the pipe bod; and a pressure relief device operable to open and relieve pressure from one side to another side of the packer element when exposed to a given pressure differential acting across the pressure relief device from said one side of the packer element, the pressure relief device also adapted to close when exposed to a lower than said given pressure differential acting thereacross from said one side of the packer element.

A fluid diverter tool, system and method of diverting a fluid flow in a in a well, having: a tubular mandrel and a packer element affixed onto an exterior thereof and operable to sealingly engage an inside of a pipe body to divert a flow of a treatment fluid outwards through holes formed in the pipe bod; and a pressure relief device operable to open and relieve pressure from one side to another side of the packer element when exposed to a given pressure differential acting across the pressure relief device from said one side of the packer element, the pressure relief device also adapted to close when exposed to a lower than said given pressure differential acting thereacross from said one side of the packer element.