Hydraulic well pump

Patent · Tue Feb 25 04:00:00 EST 1986

OSTI ID:5865972

Dollison, W W

This patent describes a system for operating a sucker rod string connected with a well pump. This pump consists of: a double-acting fluid cylinder having opposing power ends; means for connecting the cylinder with the sucker rod string for raising and lowering the string to operate the pump; means for supplying pressurized fluid alternately to the cylinder ends including a direction control movable between extend and retract conditions to extend and retract the cylinder; drive means for shifting the direction control; control means for operating the drive means responsive to the extend and retract movements of the cylinder; including limit valves positioned to simulate the hydraulic cylinder extend and retract stroke end locations, the limit valves being movably mounted for changing the location of each limit valve and the distance between the limit valves for selectively adjusting the length of the strokes of the hydraulic cylinder and the end limit of the extend and retract strokes of the cylinder. A cam operator is for opening and closing each of the limit valves at the end locations and means connecting the cam operator means with the hydraulic cylinder. Cable is reeved over the movable and fixed sheave means and secured along the second end thereof at a fixed location; and means for applying a fluid counterbalancing force into the cylinder for offsetting the combined weights of the sucker rods string, a production fluid column in a well core above the pump, and movable surface equipment supported on the cylinder.

• Assignee: Otis Engineering Corp., Dallas, TX
• Patent Number(s): US 4571939
• OSTI ID: 5865972
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
020300* -- Petroleum-- Drilling & Production
03 NATURAL GAS
030300 -- Natural Gas-- Drilling
Production
& Processing
CABLES
CONTROL EQUIPMENT
CYLINDERS
EQUIPMENT
FLOW REGULATORS
HOISTING
HYDRAULIC CONTROL DEVICES
HYDRAULIC EQUIPMENT
MATERIALS HANDLING
NATURAL GAS WELLS
OIL WELLS
PRESSURIZING
PUMPS
ROD PUMPS
VALVES
WELLS