Hydraulic well pump

Patent · Tue Sep 08 04:00:00 EDT 1987

OSTI ID:5836670

Dollison, W W

This patent describes a system for operating a sucker rod string connected with a well pump comprising: 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; hydraulic 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; and means for applying a fluid counterbalancing force into the cylinder for offsetting the combined weights of the sucker rod string. A production fluid column in a well bore above the pump, and movable surface equipment supported on the cylinder include an accumulator connected with the hydraulic pump means and the direction control for supercharging the intake of the pump during the extend movement of the cylinder and for applying an opposing hydraulic force to the cylinder during the retract movement.

• Assignee: Otis Engineering Corp., Dallas, TX
• Patent Number(s): US 4691511
• OSTI ID: 5836670
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
020300* -- Petroleum-- Drilling & Production
03 NATURAL GAS
030300 -- Natural Gas-- Drilling
Production
& Processing
ACCUMULATORS
CONTAINERS
CONTROL
CYLINDERS
DESIGN
EQUIPMENT
FIELD PRODUCTION EQUIPMENT
FLUID MECHANICS
HYDRAULIC ACCUMULATORS
HYDRAULICS
MECHANICAL ENERGY STORAGE EQUIPMENT
MECHANICS
NATURAL GAS WELLS
OIL WELLS
OPERATION
PRESSURIZING
PUMPING
PUMPS
ROD PUMPS
TANKS
WELLS