E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
E21B 37/00 (2006.01) B08B 9/02 (2006.01) E21B 43/00 (2006.01) E21B 43/12 (2006.01) F16L 55/26 (2006.01)
Patent
CA 2429506
A method of clearing blockages below a reciprocating downhole tubing pump and a reciprocating downhole tubing pump. A standing ball valve assembly is axially movable along a barrel with axial travel being limited by an underlying axial stop. A spring is positioned between the standing ball valve and the axial stop. The spring biases the standing ball valve assembly into an operative position. Upon a travelling ball valve engaging the standing ball valve assembly and a compressive force being exerted upon the spring, the standing ball valve assembly is moved to a circulating position in which a first pin prevents a ball from engaging a ball seat on the travelling ball valve and a second pin prevents a ball from engaging a ball seat on the standing ball valve assembly. This permits a circulation of fluids through both the travelling ball valve and the standing ball valve assembly.
931285 Alberta Ltd.
931289 Alberta Ltd.
Burns Bradley Gerald
Woodruff Nathan V.
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