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Title: Pumping system for oil production

A pumping system for oil production comprises a hydraulic unit set on the ground and adapted to send out a pressure oil, and a pump unit set in an oil well and adapted to draw up crude oil therefrom. The pump unit comprises a pump cylinder, and a plunger reciprocatingly moved in the pump cylinder. The plunger is provided with a clearance formed between the outer circumferential surface of a lower end portion thereof and the inner circumferential surface of the pump cylinder. The pressure oil supplied from the hydraulic unit is ejected from the clearance along the inner surface of the pump cylinder into a cylinder chamber.
Authors:
;
Publication Date:
OSTI Identifier:
6486613
Report Number(s):
US 4451212
Resource Type:
Patent
Resource Relation:
Patent Priority Date: Priority date 6 Nov 1981, Japan; Other Information: PAT-APPL-318981
Country of Publication:
United States
Language:
English
Subject:
02 PETROLEUM; OIL WELLS; ROD PUMPS; DESIGN; OPERATION; CYLINDERS; DEPTH; HYDRAULIC EQUIPMENT; PRESSURIZING; VALVES; VISCOSITY; CONTROL EQUIPMENT; DIMENSIONS; EQUIPMENT; FLOW REGULATORS; PUMPS; WELLS 020300* -- Petroleum-- Drilling & Production