Pressure limiter for a downhole pump and testing apparatus

Details Pressure limiter for a downhole pump and testing apparatus Pressure limiter for a downhole pump and testing apparatus

E - Fixed Constructions

21

B

166/62

E21B 34/06 (2006.01) E21B 33/124 (2006.01)

Patent

CA 1312820

87.079Ai Abstract A pressure limiter for use with a positive displacement pump and an inflatable packer. The pressure limiter in- cludes an outer housing with an inner mandrel disposed therein. Slidably disposed between the mandrel and housing is a generally annular piston. A spring biases the piston toward a closed position. Packer pressure acts upwardly on the piston tending to move it to an open position in which pump discharge pressure is relieved to a well annulus. A check valve prevents premature relief of pressure of the packer. Once the piston is in an open position, packer pressure will maintain it in the open position until pressure is relieved from the packer.

608467

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