US 12,037,858 B2
Downhole positive displacement pump
Jørgen Hallundbæk, Zug (CH)
Assigned to WELLTEC A/S, Allerød (DK)
Filed by Welltec A/S, Allerød (DK)
Filed on Sep. 28, 2021, as Appl. No. 17/487,660.
Claims priority of application No. 20199041 (EP), filed on Sep. 29, 2020.
Prior Publication US 2022/0098946 A1, Mar. 31, 2022
Int. Cl. E21B 23/04 (2006.01); E21B 23/06 (2006.01); E21B 33/127 (2006.01); E21B 43/10 (2006.01); F04B 17/03 (2006.01); F04B 47/06 (2006.01); F04B 53/10 (2006.01); F04B 53/16 (2006.01)
CPC E21B 23/0419 (2020.05) [E21B 23/06 (2013.01); E21B 33/127 (2013.01); E21B 33/1275 (2013.01); E21B 43/103 (2013.01); F04B 17/03 (2013.01); F04B 47/06 (2013.01); F04B 53/10 (2013.01); F04B 53/16 (2013.01)] 17 Claims
OG exemplary drawing
 
1. A wireline downhole double-acting positive displacement pump for delivering an increased pressure downhole at a location in a well to perform an operation, the well producing hydrocarbon-containing fluid streaming up the well, comprising:
a housing having a first end closest to a top of the well and a second end opposite the first end, the housing having a pump inlet and a pump outlet, where the pump outlet is arranged closer to the second end than to the first end,
a wireline connected to the first end,
a first chamber arranged in the housing, the first chamber having a first outlet in fluid communication with the pump outlet,
a first piston movable in the first chamber for pressing fluid out of the pump outlet, and
a drive including an electric motor powered by the wireline and configured to drive the first piston in a reciprocating movement between a first direction and an opposite second direction in the first chamber, and
wherein the first piston divides the first chamber into a first chamber part and a second chamber part, the first chamber part comprising the first outlet and a first inlet, a first valve being arranged at the first outlet for allowing fluid to flow out of the first chamber part and preventing fluid from flowing into the first chamber part, a second valve being arranged in the first inlet for allowing fluid to flow into the first chamber part and preventing fluid from flowing out of the first chamber part, the second chamber part comprises a second outlet in fluid communication with the pump outlet and a second inlet, a third valve being arranged in the second outlet for allowing fluid to flow out of the second chamber part and preventing fluid from flowing into the second chamber part, and a fourth valve being arranged in the second inlet for allowing fluid to flow into the second chamber part and preventing fluid from flowing out of the second chamber part,
wherein the downhole double-acting positive displacement pump is configured to pump fluid out of the pump outlet when the first piston moves in both the first direction and the second direction, and
wherein the downhole double-acting positive displacement pump further comprises a control unit configured to receive an output of the drive and thereby control the movement of the first piston in the first direction or the second direction.