Passive pressure application and regulation of downhole hydraulic devices

A method for applying and regulating pressure to a hydraulic device, the method comprising:

• introducing a downhole device into a wellbore, the downhole device comprising:
• a relief check valve;
• wherein the relief check valve is fluidically coupled to a fluid separator and a hydraulic chamber;
• wherein the relief check valve allows fluid flow to the fluid separator but does not allow fluid flow to the hydraulic chamber;
• wherein hydraulic pressure in the hydraulic chamber that exceeds a cracking pressure of the relief check valve is bled from the hydraulic chamber by the relief check valve;
• a pressure transfer check valve;
• wherein the pressure transfer check valve is fluidically coupled to the hydraulic chamber and the fluid separator;
• wherein the pressure transfer check valve allows fluid flow to the hydraulic chamber but does not allow fluid flow to the fluid separator;
• wherein hydraulic pressure is transferred to the hydraulic chamber from the fluid separator via the pressure transfer check valve;
• the hydraulic chamber;
• wherein the hydraulic chamber stores hydraulic fluid and is fluidically coupled to an outport port;
• wherein the stored hydraulic fluid actuates the hydraulic device;
• the output port;
• wherein the output port is coupled to the hydraulic device and configured to open to allow hydraulic fluid to flow to the hydraulic device to actuate the hydraulic device;
• the fluid separator;
• wherein the fluid separator is fluidically coupled to an external port configured to allow wellbore fluid to enter and exit from the fluid separator to transfer or relieve hydraulic pressure from the hydraulic chamber via the pressure transfer check valve or the relief check valve respectively;
• and
• a solenoid valve fluidically coupled to the hydraulic chamber and the fluid separator and configured to open and allow hydraulic fluid to flow from the hydraulic chamber to the fluid separator thereby bypassing the relief check valve;
• and
• applying pressure to the hydraulic device from the hydraulic chamber.

A system for applying and regulating pressure to hydraulic devices, the system comprising:

• a downhole device comprising:
• a relief check valve;
• wherein the relief check valve is fluidically coupled to a fluid separator and a hydraulic chamber;
• wherein the relief check valve allows fluid flow to the fluid separator but does not allow fluid flow to the hydraulic chamber;
• wherein hydraulic pressure in the hydraulic chamber that exceeds a cracking pressure of the relief check valve is bled from the hydraulic chamber by the relief check valve;
• the pressure transfer check valve;
• wherein the pressure transfer check valve is fluidically coupled to the hydraulic chamber and the fluid separator;
• wherein the pressure transfer check valve allows fluid flow to the hydraulic chamber but does not allow fluid flow to the fluid separator;
• wherein hydraulic pressure is transferred to the hydraulic chamber from the fluid separator via the pressure transfer check valve;
• the hydraulic chamber;
• wherein the hydraulic chamber stores hydraulic fluid and is fluidically coupled to an outport port;
• wherein the stored hydraulic fluid actuates the hydraulic device;
• the output port;
• wherein the output port is coupled to the hydraulic device and configured to open to allow hydraulic fluid to flow to the hydraulic device to actuate the hydraulic device;
• the fluid separator;
• wherein the fluid separator is fluidically coupled to an external port configured to allow wellbore fluid to enter and exit from the fluid separator to transfer or relieve hydraulic pressure from the hydraulic chamber via the pressure transfer check valve or the relief check valve respectively;
• and
• a solenoid valve fluidically coupled to the hydraulic chamber and the fluid separator and configured to open and allow hydraulic fluid to flow from the hydraulic chamber to the fluid separator thereby bypassing the relief check valve;
• and
• a completion coupled to the downhole device.