Hydraulic well pump
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
- Resource Relation:
- Patent File Date: Filed date 23 Oct 1985
- Country of Publication:
- United States
- Language:
- English
Similar Records
Oil well pump driving unit
Oil well pump driving unit
Related Subjects
03 NATURAL GAS
ROD PUMPS
DESIGN
HYDRAULICS
CONTROL
CYLINDERS
FIELD PRODUCTION EQUIPMENT
HYDRAULIC ACCUMULATORS
NATURAL GAS WELLS
OIL WELLS
OPERATION
PRESSURIZING
PUMPING
ACCUMULATORS
CONTAINERS
EQUIPMENT
FLUID MECHANICS
MECHANICAL ENERGY STORAGE EQUIPMENT
MECHANICS
PUMPS
TANKS
WELLS
020300* - Petroleum- Drilling & Production
030300 - Natural Gas- Drilling
Production
& Processing