Modular electro-hydraulic downhole control system

A well system, comprising:

• a conveyance extendable into a wellbore from a well surface location;
• a downhole tool coupled to the conveyance and conveyable into the wellbore, the downhole tool including a hydraulically operated actuation device;
• and
• a control system that regulates a flow of hydraulic fluid to the actuation device, the control system including:
• a pilot module having a first electrically operated valve fluidly coupled to a first hydraulic input, a pressure source, and a fluid return and a second electrically operated valve fluidly coupled to a second hydraulic input, the pressure source, and the fluid return;
• and
• a power module fluidly coupled to the actuation device at an output line and including a power line in fluid communication with the output line, a first power module check valve arranged in the power line, and at least one directional control valve actuatable in response to a pilot signal to drain hydraulic fluid from the power module into the fluid return via a control pressure return line, and wherein the pilot signal is a first pilot signal, the power line extends from the pressure source to the output line, and the at lest one directional control valve is a first pilot-operated check valve arranged in the control pressure line, the power module further including:
• a first pilot line extending from the second hydraulic input to the control pressure return line, wherein the second electrically operated valve is activated to transmit the first pilot signal to the first pilot-operated check valve;
• a second pilot line extending from the first hydraulic input to the power line;
• and a second pilot-operated check valve arranged in the power line at an end of the second pilot line, wherein the first electrically operated valve is activated to transmit a second pilot signal to the second pilot-operated check valve, which allows hydraulic fluid to flow to the actuation device via the power line and the output line.

A control system that regulates a flow of hydraulic fluid to an actuation device operable to actuate a downhole tool, the control system comprising:

• a first electrically operated valve fluidly arranged in a pressure supply line and fluidly coupled to a pressure source and an output, wherein the output is fluidly coupled to the actuation device and activation of the first electrically operated valve provides hydraulic fluid directly to the actuation device;
• a second electrically operated valve arranged in a pressure return and fluidly coupled to a fluid return and the output, wherein activation of the second electrically operated valve allows fluid drainage from the actuation device via the output;
• a first pilot module check valve arranged in a pressure supply line downstream from the first electrically operated valve;
• and
• a second pilot module check valve arranged in the pressure return line downstream from the second electrically operated valve.