Patent ID: 6193476
Filing Date: 2001-02-27
Classification: F04B

Abstract:
A single stroke hydraulic pump for raising production fluid against the force of gravity a substantial distance, comprising:a pump body;a pump piston having a top and a base connected by a production fluid passage with at least the base being below a natural production fluid level;a column of production fluid, within the pump body, stretching from the base of the pump piston to a discharge reservoir, and having a static hydraulic head pressure;a column of power fluid within the pump body and having hydraulic head pressure identical to the static hydraulic head pressure of the column of production fluid when at a maximum volume;powering means isolated from the production fluid for powering the pump piston, and, as a result, raising the column of production fluid with the resultant discharge of a volume of production fluid into a discharge reservoir;a pressure barrier to isolate the powering means from the production fluid and to restrain the stroke of the pump piston;resetting means to return the pump piston to a start position, after a volume of the column of production fluid has been discharged to the reservoir at a controlled rate so as not to damage the pressure barrier or the pump piston;entering and preventing means for allowing external production fluid to enter into the pump body and into the production fluid passage in the pump piston and preventing the production fluid from flowing out when the pump piston is raised; andwherein the static hydraulic head of the column of production fluid is raised only once the length of the stroke of the pump piston, and a volume of the production fluid is discharged from the top of the column of production fluid and the column of production fluid is returned without violent force to a point of beginning.