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© Weatherford. All rights reserved. ARTIFICIAL LIFT SYSTEMS
© Weatherford. All rights reserved. ARTIFICIAL LIFT SYSTEMS VSH2 Nitrogen Over Hydraulic Unit 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 What is the VSH2 ?
© Weatherford. All rights reserved. ARTIFICIAL LIFT SYSTEMS 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.
© Weatherford. All rights reserved. ARTIFICIAL LIFT SYSTEMS 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
© Weatherford. All rights reserved. ARTIFICIAL LIFT SYSTEMS VSH2 Direct Drive Pump Variable speed Rated 3100 rpm Rated at 6000 lb Closed loop Less leak points Less parts Long service life
© Weatherford. All rights reserved. ARTIFICIAL LIFT SYSTEMS VSH2 Electric Motor Drive Direct drive No belts No sheaves
© Weatherford. All rights reserved. ARTIFICIAL LIFT SYSTEMS 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 PPRLs 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)
© Weatherford. All rights reserved. ARTIFICIAL LIFT SYSTEMS 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 VSH2 Benefits
© Weatherford. All rights reserved. ARTIFICIAL LIFT SYSTEMS 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
© Weatherford. All rights reserved. ARTIFICIAL LIFT SYSTEMS VSH2 Three Moving Parts Accumulator nitrogen / hydraulic Cylinder two stage double acting Pump direct drive variable speeds up & down
© Weatherford. All rights reserved. ARTIFICIAL LIFT SYSTEMS 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
© Weatherford. All rights reserved. ARTIFICIAL LIFT SYSTEMS VSH2 Maintenance One filter after the first 30 days and then every 5 months thereafter. Normal equipment visual inspections.
© Weatherford. All rights reserved. ARTIFICIAL LIFT SYSTEMS VSH2 Safety Controls Low hydraulic oil level High oil temperature Manual thermometer Rod separation Over torque relief valve High pressure alarm light
© Weatherford. All rights reserved. ARTIFICIAL LIFT SYSTEMS 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.
© Weatherford. All rights reserved. ARTIFICIAL LIFT SYSTEMS VSH2 Base Plate Installation
© Weatherford. All rights reserved. ARTIFICIAL LIFT SYSTEMS VSH2 Pedestal Mount Unit
© Weatherford. All rights reserved. ARTIFICIAL LIFT SYSTEMS VHS2 Portable Unit
© Weatherford. All rights reserved. ARTIFICIAL LIFT SYSTEMS VSH2 Portable 120 Natural Gas Unit
© Weatherford. All rights reserved. ARTIFICIAL LIFT SYSTEMS VSH2 Gas Manifold Isolates individual bottles Greater fill capacities Less nitrogen loss
© Weatherford. All rights reserved. ARTIFICIAL LIFT SYSTEMS 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
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