Patent ID: 8192181
Filing Date: 2012-06-05
Classification: E21B,F04B

Abstract:
1. A double standing valve sucker rod pump comprising: a lower standing valve and an upper standing valve connected together with a coupling, said upper standing valve located above said lower standing valve, an inlet provided on the lower standing valve communicating with the bottom of a well, an outlet provided on the lower standing valve communicating with a coupling chamber provided within the coupling between the upper and lower standing valves so that fluid from the bottom of the well passes through the lower standing valve and into the coupling chamber when the lower standing valve is open and the upper standing valve is closed, said lower standing valve being open and said upper standing valve being closed during upstroke of the well's rod string and an inlet provided on the upper standing valve communicating with the coupling chamber, an outlet provided on the upper standing valve communicating with an interior tubing space of the well so that fluid from the coupling chamber passes through the upper standing valve and out the pump's outlet when the upper standing valve is open and the lower standing valve is closed, and said upper standing valve being open and said lower standing valve being closed during down stroke of the well's rod string.