Crowded Well Cellar
Due to the minimal footprint of the wellhead equipment, Hydraulic Rod Pumps are ideal for close well spacing found in urban, offshore, or any other high density drill site.
These are actual wellheads for an urban drill site. Most of the wells in this picture are Hydraulic Rod Pumps.
Separate the Power Units From the Wellhead
Power Units can be located away from the wellhead. In this picture the power units are located in a building 100ft from the well cellar. This simplifies well work-over by freeing up space in a crowded well cellar.
Many high density drill sites have directional wells. The ultra long stroke reduces rod string wear in deviated wells when compared with shorter stroke lengths.
Stackable Power Units
For very high density drill sites, we offer stackable power unit frames. These power units are stacked 2 high by 6 wide (minus 2 units in this picture) running a total of 20 wells. These power units are located in a room separate from the well cellar.
Rod Pumps on Deviated Wells
Ultra Long Stroke Rod Pumps are used on highly deviated wells. Please note that HRPI equipment is not applicable on all deviated wells. Please contact us for application specific guidelines. As a general rule, well bore deviations should not exceed the ability of the rod string to fall under its own weight.
A tubing rotator is available to reduce wear. The entire cylinder and tubing assembly is rotated through a series of gear reductions.
Our rod rotator system is being actively field tested. Please contact us for more details.
Advanced Pump Off Control
Beam Pumping Units typically deploy a downtime or dwell period methodology to reduce the average SPM (Strokes Per Minute), as opposed to changing sheaves, belts, crank pin positions, etc. While this may be acceptable for many beam unit applications (although not ideal), the downtime during a pumped off condition allows solids to settle down and on top of the bottomhole pump, potentially sticking the pump. This can lead to increased well failure frequencies and higher pulling costs, which CAN be reduced, if not avoided. Another potentially more detrimental issue (financially speaking, especially with higher oil prices), is the retardation effect to production rates. To prevent over pumping in a pumped-off (gas & fluid-pound) condition the beam unit is stopped, often for long durations to allow the formation reservoir pressure to refill the well bore annulus. The unit it then restarted and the well is then pumped off, once again. These fluid level fluctuations in the well bore drive up pressures against the reservoir, holding fluid back that could otherwise be produced.
Unlike a beam unit, the HRP unit's stroke rate can be altered remotely via an intuitive Windows based software package. By reducing the strokes per minute (SPM) under a pumped off condition, the well is kept operational thus reducing the time for solids to settle. This fine tuning of the pump rate also maintains a consistent reservoir pressure allowing for more predictable fluid flows.
For large changes in well properties, the HRP unit's motor/pump and hydraulic cylinder combination can be changed relatively easily when compared to beam units. Once a well is designed there is rarely a need to alter the pump, motor, cylinder configuration. HRP Power Units can also be moved easily from one well to another by simply re-plumbing the hydraulic lines, or by moving the unit itself. Portable trailer mounted units are also available.
Reduced Equipment Failures
Ultra-Long Stroke rod pumps experience less rod stress and wear when compared to shorter stroke beam units.
Greater lifting capacities allow for increased bottom hole pump sizes. Properly designed wells can reduce the polished rod velocity and/or SPM (strokes per minute).
Near linear polished rod velocities reduces Peak Polished Rod Load (PPRL).
Eliminate Rod String Compression. Our equipment never induces a downward force on the polished rod. Rods are allowed to fall at a controlled rate.
Unlike beam units or other lift methods, HRP units can be easily moved from well to well. As wells age, their lift design requirements inevitably change. From water flood to steam flood, the original Beam Unit placed in service may prove to be too large or small for the changing well dynamics. In many cases, Beam Units become pumped off and are left idle, allowing solids to settle on the downhole pump. Chronically pumped off beam units are typically an indication of an inappropriate paring of surface equipment with the downhole pump. Unfortunately, beam units are not easily replaced and so they are simply left idle.
HRP units can be easily and remotely optimized for the appropriate SPM, given changing well conditions. For more coarse adjustments, the power unit can be easily moved from well to well, or the hydraulic pump/motor and hydraulic cylinder combination can be altered to achieve the optimal pump configuration for the well.
Portable Trailer Mounted Units
Portable Trailer Mounted Units (2003): Following a successful multi-unit, multi-year rental program with one of our customers, we are proud to now offer lightweight, temporary trailer-mounted rental units. Easily pulled with a mid-range weight class pickup, yet capable of delivering 336" stroke lengths with a 42,000 PPRL load rating. Currently, our power units are only available in the electrically driven model. Photo to the right: Aera Energy, Huntington Beach, CA. pump/motor and hydraulic cylinder combination can be altered to achieve the optimal pump configuration for the well.