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A technique facilitates control over one or more well tools coupled to one or more corresponding control modules. Actuation of the control modules and the well tools may be achieved with three control lines connected to the one or more control modules. Transitioning of the control modules to sequent

A technique facilitates control over one or more well tools coupled to one or more corresponding control modules. Actuation of the control modules and the well tools may be achieved with three control lines connected to the one or more control modules. Transitioning of the control modules to sequential stages and the consequent actuation of the corresponding well tools is achieved by applying a single pressure level selectively through the three control lines.

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1. A system for actuating a tool in a well, comprising: a downhole well tool;a pilot valve; anda control module coupled to the downhole well tool to control actuation of the downhole well tool, the control module comprising a module piston and three control lines in which a first control line delive

1. A system for actuating a tool in a well, comprising: a downhole well tool;a pilot valve; anda control module coupled to the downhole well tool to control actuation of the downhole well tool, the control module comprising a module piston and three control lines in which a first control line delivers a fluid to displace the module piston to a desired downhole well tool actuation position, a second control line supplies fluid to the downhole well tool to actuate the downhole well tool, and a third control line supplies fluid to reset the module piston after a desired actuation of the downhole well tool,wherein the three control lines operate with a single pressure level, and wherein:the module piston is moved through a module piston housing in predetermined increments;the predetermined increments are controlled by a metering piston; andthe pilot valve enables return of the metering piston to an original position between each incremental move of the module piston. 2. The system as recited in claim 1, wherein the downhole well tool comprises a flow control valve. 3. The system as recited in claim 1, wherein the downhole well tool comprises a plurality of downhole well tools that may be individually controlled. 4. The system as recited in claim 3, wherein the control module comprises a plurality of control modules each having a module piston housing with hydraulic actuation ports positioned at unique locations along the module piston housing relative to the positioning of actuation ports along the other module piston housings. 5. The system as recited in claim 1, wherein the module piston comprises a plurality of flow channels located to control flow of actuation fluid through the second control line in a desired manner at each incremental position as the module piston is moved through the predetermined increments. 6. The system as recited in claim 5, wherein the ultimate movement of the module piston in either direction along the module piston housing is controlled by hard stops. 7. A method of downhole actuation in a well, comprising: coupling a downhole well tool to a control module having a plurality of control module actuation positions, wherein coupling comprises coupling a plurality of downhole tools to a plurality of control module housings having internal module pistons;connecting three control lines to the control module;transitioning the control module through the plurality of control module actuation positions, wherein transitioning comprises selectively moving the internal module pistons within the control module housings via the single pressure level, and transitioning further comprises moving a module piston to incremental positions in a module piston housing;actuating the downhole well tool through a plurality of actuation states that correspond with the control module actuation positions;applying only a single pressure level selectively through the three control lines to accomplish transitioning of the control module and actuating of the downhole well tool; and wherein:each of the plurality of control module housings comprises a pilot valve that enables the return of the metering piston to an original position between each incremental position. 8. The method as recited in claim 7, further comprising controlling movement of the module piston through the incremental positions with a metering piston. 9. The method as recited in claim 8, wherein actuating comprises controlling a flow of actuation fluid to the downhole tool by aligning selected flow channels in the module piston with corresponding hydraulic ports in the module piston housing. 10. A system to control downhole actuation, comprising: a control module, comprising:a module piston mounted in a module piston housing, the module piston having a plurality of flow channels to direct an actuation fluid from an inlet port in the module piston housing to a selected outlet port or to a no-flow position;a metering piston coupled in cooperation with the module piston to limit movement of the module piston to incremental movements within the module piston housing to selectively control flow of the actuation fluid; anda plurality of control lines in which a first control line delivers fluid to move the module piston through the module piston housing; a second control line delivers the actuation fluid; and a third control line supplies fluid to reset the module piston to an original position; anda pilot valve closed by pressurized fluid delivered via the first control line, the removal of pressure in the first control line allowing the pilot valve to open, wherein upon opening of the pilot valve fluid may be delivered through the third control line to move the module piston back to its original position. 11. The system as recited in claim 10, wherein the plurality of control lines delivers fluid limited to a single pressure level. 12. The system as recited in claim 10, further comprising a downhole well tool connected in fluid communication with the module piston housing to selectively receive the actuating fluid.