Simplicity

A hydrostatic fluid linkage between master and slave - similar in operating principle to the common automobile brake system.
 

	Hydraulic fluid is forced from the power unit master cylinder to the wellhead slave cylinder
Hydraulic fluid is received back into the power unit master cylinder from the wellhead slave cylinder.
Nitrogen Gas    -	Power Assist   Nitrogen gas under pressure forces the master cylinder piston to expand, assisting the up stroke.
Sinusoidal Motion Piston rod travel accelerates and decelerates at each end of the stroke.

• Pumps the deepest wells. 
• Operates (pulls) big bore pumps at greater strokes per  minute. 
• Pump strokes to 150 inches (381 cm), up to 15 strokes per minute, with rod loads to 55,000 pounds (25,100kg). 
• Requires less horsepower to operate than conventional mechanical pump jacks. 
• All weather operation.

• Concrete foundations not required.  Unit mounts directly to a conventional wellhead - a major cost saving. 
• The portable power unit is skid mounted and easily handled in the field. 
• Easily installed or removed by a two man crew in a matter of hours!  This feature makes Stantec Hydrostatic Pump Jacks ideal units for well testing, rotational well pumping or for seasonal wells. 
• Light weight, ideal for soft ground installations such as muskeg or jungle. 
• Cluster drilled wells, ideal for offshore platforms where space and weight are critical.

• All working equipment is accessible from ground level. 
• Accurate and safe balancing - no counterweights to move.

• Simplicity of construction - no hydraulic pumps or valves. 
• Sinusoidal motion of the pump rod generates lower stress and less fatigue on the rod string. 
• No forces are exerted on the remote power unit.  The force of the polish rod pull is exerted directly on the wellhead by the slave cylinder. 
• Precise in - service balancing performed within minutes. 
• Instant reading of the maximum and minimum rod load - dyno charts can be taken from the hydraulic pressure without shutting down the unit.

• A choice of power sources - electric, diesel, propane, natural gas or gasoline. 
• Dial in variable pump speed. 
• Variable stroke length. 
• Dual master cylinder power unit to pump two adjacent wells. 
• Trailer or truck mounted power unit. 
• Safety enclosures or total enclosures. 
• Remote monitoring.