ARTIFICIAL LIFT SYSTEMS

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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 ARTIFICIAL LIFT SYSTEMS

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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.

ARTIFICIAL LIFT SYSTEMS

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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 ARTIFICIAL LIFT SYSTEMS

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VSH2 Direct Drive Pump



Variable speed



Rated 3100 rpm



Rated at 6000 lb



Closed loop



Less leak points



Less parts



Long service life ARTIFICIAL LIFT SYSTEMS

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VSH2 Electric Motor Drive



Direct drive



No belts



No sheaves ARTIFICIAL LIFT SYSTEMS

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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) ARTIFICIAL LIFT SYSTEMS

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VSH2 Benefits



Three sizes 60”,120” & 150”



SPM - 0 to 9 (depending on unit size)



PPRL - 35,000 - 40,000 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” ARTIFICIAL LIFT SYSTEMS

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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 ARTIFICIAL LIFT SYSTEMS

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VSH2 Three Moving Parts



Accumulator nitrogen / hydraulic



Cylinder two stage double acting



Pump direct drive variable speeds up & down ARTIFICIAL LIFT SYSTEMS

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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 ARTIFICIAL LIFT SYSTEMS

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VSH2 Maintenance



One filter after the first 30 days and then every 5 months thereafter.



Normal equipment visual inspections.

ARTIFICIAL LIFT SYSTEMS

© Weatherford. All rights reserved.

VSH2 Safety Controls



Low hydraulic oil level



High oil temperature



Manual thermometer



Rod separation



Over torque relief valve



High pressure alarm light ARTIFICIAL LIFT SYSTEMS

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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.

ARTIFICIAL LIFT SYSTEMS

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VSH2

Base Plate Installation

ARTIFICIAL LIFT SYSTEMS

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VSH2 Pedestal Mount Unit

ARTIFICIAL LIFT SYSTEMS

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VHS2 Portable Unit

ARTIFICIAL LIFT SYSTEMS

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VSH2 Portable 120” Natural Gas Unit

ARTIFICIAL LIFT SYSTEMS

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VSH2 Gas Manifold



Isolates individual bottles



Greater fill capacities



Less nitrogen loss ARTIFICIAL LIFT SYSTEMS

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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 ARTIFICIAL LIFT SYSTEMS

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