2 VSH2 Nitrogen Over Hydraulic Unit What is the VSH2 ?Reciprocating rod pumping unitOperates with conventional sucker rod systemUses nitrogen-over-hydraulic technologyDirect drive pumpVariable SPM in secondsGreater well flexibilityElectric or gas operated
3 VSH2 Nitrogen-over-Hydraulic System Two-stage cylinderNitrogen over Hydraulic AccumulatorNitrogen 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 valveChange SPM by turning switches
5 VSH2 Direct Drive Pump Variable speed Rated 3100 rpm Rated at 6000 lb Closed loopLess leak pointsLess partsLong service life
6 VSH2 Electric Motor Drive Direct driveNo beltsNo sheaves
7 VSH2 BenefitsSpecifically developed for the fields with heavy crude oil, wells with rod fall problems and better well control.Lifts greater loads using less energyHandles 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 directionSrokes 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 switchAdjustable stroke lengthsSkid size - 5ft x 8ft x 74”
9 VSH2 Why is this System Different ? Nitrogen-over-Hydraulic technologyThree moving partsGreater rod loads than conventional unitsChange SPM quickerWider range of applicationsLower maintenanceCan reduce energy consumption
10 VSH2 Three Moving Parts Accumulator nitrogen / hydraulic Cylinder two stage double actingPump direct drive variable speeds up & down
11 VSH2 Control Box Panel off/on Bridal separation High pressure Jog up/jog dwnRe-set buttonManual / autoPower On lightSpeed upSpeed downAuto start button
12 VSH2 MaintenanceOne 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 thermometerRod separationOver torque relief valveHigh pressure alarm light
14 VSH2 Rod Separation Plate When the pump sticks, separation between plate and switch occursThis de-strokes the unit and stops the unit from stroking until the polish rod falls or the pumper is aware of the problemIf the polish rods falls later, the unit continues to stroke until separation occurs againA red alarm light indicates separation has occurred sometime during the day or night.
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 testingDuring downtime for repairs of conventionalLengthily delivery timesProduction decline to reduce energy consumptionLooking for a unit that can reduce freight,setup charges,site preparation, maintenance and energy consumptionGreater well controlGreater well flexibility