Patent ID: 8535024
Filing Date: 2013-09-17
Classification: E21B,F04B

Abstract:
1. A downhole pump, comprising: a) a barrel having barrel first and second ends and a first one-way valve; b) a plunger having plunger first and second ends, an outside diameter and a second one-way valve, the plunger located in the barrel so that one of the plunger or the barrel reciprocates with respect to the other of the plunger or the barrel, the plunger having an interior passage therethrough, the plunger second end being interposed between the barrel second end and the plunger first end, the plunger and the barrel forming a compression chamber between the first and second one-way valves; c) the plunger first end having a leading edge at the outside diameter and a wall that tapers radially in from the leading edge so as to form a depression relative to the leading edge; d) a sucker rod string coupling coupled to the wall at the plunger first end; e) ports located so as to direct fluid from the depression upwardly and outwardly over the leading edge, the ports communicate with the interior passage.