US 6,585,049 B2 · Dual displacement pumping system suitable for fluid production from a well

Abstract

A dual displacement pumping system is disclosed. In one embodiment, the system includes a subsurface pump, a tubing string, and a surface pumping unit connected to the subsurface pump by a reciprocating member. The subsurface pump includes a pump barrel mounted to the end of the tubing string, and a plunger mounted to the end of the reciprocating member. Valves cause downward motion of the plunger in the pump barrel to force fluid from the lower end of the pump barrel into the reciprocating member, and fill the upper end of the pump barrel with well bore fluid. They also cause upward motion of the plunger to force fluid from the upper pump barrel into the tubing string, and fill the lower pump barrel with well bore fluid. Thus, both pumping movements are exploited, nearly doubling the volume of fluid pumped with a conventional surface configuration.

Claims19

Dependent claims

A dual displacement pump comprising:

a pump body that attaches to a tubing string, wherein the pump body includes a pump barrel;
a plunger that attaches to a tube inside the tubing string, wherein the plunger is configured to reciprocate inside the pump barrel when the tube is reciprocated, wherein the plunger divides the pump barrel into a first chamber and a second chamber,
wherein motion of the plunger in a first direction forces fluid from the first chamber to enter the tube and draws well bore fluid into the second chamber, and
wherein motion of the plunger in a second direction opposite the first direction forces fluid from the second chamber to enter an annulus between the tube and the tubing string, and draws well bore fluid into the first chamber.

1 more element

Dependencies are inferred from the claim text.

Dual displacement pumping system suitable for fluid production from a well

Life of this patent

Dual displacement pumping system suitable for fluid production from a well

Life of this patent

Abstract

Claims19