Electrically operated low power completion control system

Abstract

An example control system includes a hydraulic pump disposed in a wellbore, a valve bank disposed in the wellbore, and an unpressurized hydraulic fluid reservoir. The hydraulic pump is fluidically connected with the valve bank. The valve bank is fluidically connected with the unpressurized hydraulic fluid reservoir. The unpressurized hydraulic fluid reservoir is fluidically connected with the hydraulic pump. The control system is configured to flow pressurized hydraulic fluid exiting from the hydraulic pump to the valve bank to be distributed from the valve bank to the wellbore equipment.

What is claimed is: 
     
         1 . A control system for operating wellbore equipment, the control system comprises:
 a hydraulic pump disposed in a wellbore,   a valve bank disposed in the wellbore, and   an unpressurized hydraulic fluid reservoir; wherein the hydraulic pump is fluidically connected with the valve bank; wherein the valve bank is fluidically connected with the unpressurized hydraulic fluid reservoir; wherein the unpressurized hydraulic fluid reservoir is fluidically connected with the hydraulic pump; wherein the control system is configured to flow pressurized hydraulic fluid exiting from the hydraulic pump to the valve bank to be distributed from the valve bank to the wellbore equipment.   
     
     
         2 . The control system of  claim 1 , wherein the hydraulic pump is directly connected to the valve bank without any intervening lines or separate connecting components; wherein the valve bank is directly connected to the unpressurized fluid reservoir without any intervening lines or separate connecting components; wherein the unpressurized fluid reservoir is directly connected to the hydraulic pump without any intervening lines or separate connecting components. 
     
     
         3 . The control system of  claim 1 , further comprising an accumulator fluidically connected to the hydraulic pump and the valve bank and the accumulator is configured to store pressurized hydraulic fluid from the hydraulic pump. 
     
     
         4 . The control system of  claim 3 , wherein a first output line connects the hydraulic pump to the accumulator; wherein a second output line connects the accumulator to the valve bank;
 wherein an exhaust line connects the valve bank to the unpressurized fluid reservoir; and   wherein a hydraulic fluid input line connects the unpressurized hydraulic fluid reservoir to the hydraulic pump.   
     
     
         5 . The control system of  claim 4 , wherein the unpressurized fluid reservoir and the hydraulic pump are disposed in a first wellbore zone between a tubing hanger and a safety valve; wherein the accumulator and the valve bank are disposed in a second wellbore zone between a production packer and an interval control valve; wherein the first output line traverses at least a third wellbore zone to connect the hydraulic pump to the accumulator; wherein the exhaust line traverses at least the third wellbore zone to connect the unpressurized fluid reservoir to the valve bank. 
     
     
         6 . The control system of  claim 1 , wherein the unpressurized fluid reservoir is disposed uphole of the hydraulic pump. 
     
     
         7 . The control system of  claim 1 , wherein the unpressurized fluid reservoir is disposed on a surface of the earth. 
     
     
         8 . The control system of  claim 1 , wherein the valve bank is a first valve bank and wherein the control system comprises a second valve bank. 
     
     
         9 . The control system of  claim 8 , wherein the first valve bank is directly coupled to and fluidically connected to a first wellbore valve; wherein the second valve bank is directly coupled to and fluidically connected to a second wellbore valve. 
     
     
         10 . The control system of  claim 9 , wherein a first output line fluidically connects the hydraulic pump to the first valve bank; wherein a second output line fluidically connects the hydraulic pump to the first valve bank; wherein a pressure of the pressurized hydraulic fluid in the first output line is different from a pressure of the pressurized hydraulic fluid in the second output line; wherein a third output line fluidically connects the hydraulic pump to the second valve bank; wherein a fourth output line fluidically connects the hydraulic pump to the second valve bank; wherein a pressure of the pressurized hydraulic fluid in the third output line is different from a pressure of the pressurized hydraulic fluid in the fourth output line. 
     
     
         11 . A method for operating wellbore equipment with a control system, the method comprises:
 providing a control system comprising:
 a hydraulic pump, 
 a valve bank, and 
 an unpressurized hydraulic fluid reservoir; wherein the hydraulic pump is fluidically connected with the valve bank; wherein the valve bank is fluidically connected with the unpressurized hydraulic fluid reservoir; wherein the unpressurized hydraulic fluid reservoir is fluidically connected with the hydraulic pump; 
   flowing pressurized hydraulic fluid exiting from the hydraulic pump to the valve bank;   distributing the pressurized hydraulic fluid from the valve bank to the wellbore equipment.   
     
     
         12 . The method of  claim 11 , further comprising blocking in the pressure to the wellbore equipment by sealing a valve in the valve bank through which the pressurized hydraulic fluid is distributed to the wellbore equipment; wherein the blocking in the pressure to the wellbore equipment occurs after the pressurized hydraulic fluid is distributed to the wellbore equipment. 
     
     
         13 . The method of  claim 11 , further comprising venting hydraulic fluid to the unpressurized fluid reservoir from the valve bank. 
     
     
         14 . The method of  claim 11 , further comprising distributing pressurized hydraulic fluid to at least two different pieces of wellbore equipment. 
     
     
         15 . A system for operating wellbore equipment with a control system, the system comprising:
 a control system comprising:
 a hydraulic pump, 
 a valve bank, and 
 an unpressurized hydraulic fluid reservoir; wherein the hydraulic pump is fluidically connected with the valve bank; wherein the valve bank is fluidically connected with the unpressurized hydraulic fluid reservoir; wherein the unpressurized hydraulic fluid reservoir is fluidically connected with the hydraulic pump; wherein the control system is configured to flow pressurized hydraulic fluid exiting from the hydraulic pump to the valve bank to be distributed from the valve bank to the wellbore equipment; 
   a wellbore tubing; wherein the control system is deployed on the wellbore tubing.   
     
     
         16 . The system of  claim 15 , wherein the control system is a first control system; wherein the first control system is disposed in a first wellbore zone located between a production packer and an interval control valve; wherein the system comprises a second control system disposed in a second wellbore zone different from the first wellbore zone. 
     
     
         17 . The system of  claim 16 ; wherein the second control system is identical to the first control system. 
     
     
         18 . The system of  claim 16 ; wherein the interval control valve is a first interval control valve and the second wellbore zone is disposed between the first interval control valve and a second interval control valve. 
     
     
         19 . The system of  claim 16 ; wherein the first control system and the second control system each comprise an accumulator; wherein the accumulator of the first control system is fluidically connected to the accumulator of the second control system. 
     
     
         20 . The system of  claim 15 , further comprising a hydraulic fluid replenishment line descending from the surface and fluidically connected to the unpressurized fluid reservoir.