2. VSH2 Nitrogen Over Hydraulic Unit
What is the VSH2 ?
Reciprocating rod pumping unit
Operates with conventional sucker rod system
Uses nitrogen-over-hydraulic technology
Direct drive pump
Variable SPM in seconds
Greater well flexibility
Electric or gas operated

3. VSH2 Nitrogen-over-Hydraulic System
Two-stage cylinder
Nitrogen over Hydraulic Accumulator
Nitrogen pressure pushes the accumulator piston down forcing the hydraulic oil from the accumulator into the upper stage of the cylinder lifting 2/3 of the rod and fluid weight.
Polish rod direction is reversed via proximity switches sending a signal to the Electric Displacement Valve that changes the chamber in the lower stage to which the hydraulic oil flows.

4. VSH2 Pumping Unit Operating Principle
Nitrogen pushes down on the accumulator piston. Hydraulic fluid under piston is forced into upper chamber thus pushing the cylinder piston up.
Servo Valve routes pressurized fluid to lower stages to cycle the cylinder up or down.
Proximity switches activate the EDC valve
Change SPM by turning switches

5. VSH2 Direct Drive Pump Variable speed Rated 3100 rpm Rated at 6000 lb
Closed loop
Less leak points
Less parts
Long service life

6. VSH2 Electric Motor Drive
Direct drive
No belts
No sheaves

7. VSH2 Benefits
Specifically developed for the fields with heavy crude oil, wells with rod fall problems and better well control.
Lifts greater loads using less energy
Handles PPRL’s up to 40,000 lbs.
Pumps depths to 10,000 ft.
Changes strokes per minute with a turn of the switch in either direction
Srokes per Minute can be as slow as 0 and as fast as 9 (depending on model)

8. VSH2 Benefits Three sizes - 60”,120” & 150”
SPM - 0 to 9 (depending on unit size)
PPRL - 35, ,000 lbs.
Three moving parts - cylinder, accumulator and direct drive pump (excluding prime mover)
Safety shutdowns - rod separation, high pressure, low fluid level, high oil temp.
SPM changes with the turn of a switch
Adjustable stroke lengths
Skid size - 5ft x 8ft x 74”

9. VSH2 Why is this System Different ?
Nitrogen-over-Hydraulic technology
Three moving parts
Greater rod loads than conventional units
Change SPM quicker
Wider range of applications
Lower maintenance
Can reduce energy consumption

10. VSH2 Three Moving Parts Accumulator nitrogen / hydraulic
Cylinder two stage double acting
Pump direct drive variable speeds up & down

11. VSH2 Control Box Panel off/on Bridal separation High pressure
Jog up/jog dwn
Re-set button
Manual / auto
Power On light
Speed up
Speed down
Auto start button

12. VSH2 Maintenance
One filter after the first 30 days and then every 5 months thereafter.
Normal equipment visual inspections.

13. VSH2 Safety Controls Low hydraulic oil level High oil temperature
Manual thermometer
Rod separation
Over torque relief valve
High pressure alarm light

14. VSH2 Rod Separation Plate
When the pump sticks, separation between plate and switch occurs
This de-strokes the unit and stops the unit from stroking until the polish rod falls or the pumper is aware of the problem
If the polish rods falls later, the unit continues to stroke until separation occurs again
A red alarm light indicates separation has occurred sometime during the day or night.

15. VSH2 Base Plate Installation

16. VSH2 Pedestal Mount Unit

17. VHS2 Portable Unit

18. VSH2 Portable 120” Natural Gas Unit

19. VSH2 Gas Manifold Isolates individual bottles Greater fill capacities
Less nitrogen loss

20. VSH2 Overview When to use - temporary or permanent
Well evaluating and testing
During downtime for repairs of conventional
Lengthily delivery times
Production decline to reduce energy consumption
Looking for a unit that can reduce freight,setup charges,site preparation, maintenance and energy consumption
Greater well control
Greater well flexibility