Patent ID: 9429001
Filing Date: 2016-08-30
CPC Classification: E21B,F04B

Claim Text:
1. A dual well hydraulic pumping unit for removing well fluids from a first well and a second well, comprising: at least one prime mover; a reservoir for a hydraulic fluid; a first sucker rod assembly disposed in the first well for removing the well fluids from the first well; a first ram connected to said first sucker rod assembly for moving in an upstroke and moving said first sucker rod assembly from a downward position to an upward position, and moving in a downstroke with said first sucker rod assembly moving from said upward position to said downward position; a second sucker rod assembly disposed in the second well for removing the well fluids from the second well; a second ram connected to said second sucker rod assembly for moving in an upstroke and moving said second sucker rod assembly from a lowered position to a raised position, and moving in a downstroke with said second sucker rod assembly moving from said raised position to said lowered position; a first ram pump having a first ram pump suction port connected to said reservoir and a first ram pump discharge port connected to said first ram for transferring the hydraulic fluid into said first ram and moving said first ram from said downward position to said upward position during the upstroke of said first ram; a second ram pump having a second ram pump suction port connected to said reservoir and a second ram pump discharge port connected to said second ram for transferring the hydraulic fluid into said second ram and moving said second ram from said lowered position to said raised position during the upstroke of said second ram; and at least one control unit configured for controlling flow rates of the hydraulic fluid through said first ram pump and said second ram pump; wherein said at least one control unit operates said first ram pump for pumping the hydraulic fluid into said first ram during the upstroke of said first ram and the downstroke of said second ram, and during the downstroke of said first ram the hydraulic fluid discharged from said first ram cooperating with said at least one prime mover to power said second ram pump in response to pressures within said first ram provided by the weight of said first sucker rod assembly; wherein said at least one control unit further operates said second ram pump for pumping the hydraulic fluid into said second ram during the downstroke of said first ram and the upstroke of said second ram, and during the downstroke of said second ram the hydraulic fluid discharged from said second ram cooperating with said at least one prime mover to power said first ram pump in response to pressure within said second ram provided by the weight of said second sucker rod assembly in combination; and wherein should pump down be encountered in one of the first and second wells, defining a pumped down well, said at least one control unit will provide pump down control by changing at least one of a stroke length and a stroke rate of the pumped down well and synchronizing the pumped down well and the other of the first and second wells such that they have substantially the same period time cycle, such that the pumped down well and the other well reverse directions at approximately the same time.