Imagine. It’s your first visit to a new well site. You’ve seen the reports…this new installation's a real producer, all right, and you’re anxious to check it out. As you turn down the access road, you expect to see the familiar horse head bobbing over the treetops. You know it must be up ahead, but you can’t see anything. Cresting the hill, you make out in the distance a storage tank, piping, a vent stack…but where’s the pump? In place of the massive walking beam you were expecting to see, there's only a slender metal tube rising from the wellhead. As you pull up nearby, you notice nothing's moving, all is quiet. A quick check reading with your PDA shows that the well is, indeed, pumping fluid. What’s going on here? Welcome to Unico’s latest innovation, the LRP Linear Rod Pump.
The LRP pumping system is revolutionary departure from traditional sucker-rod artificial lift systems. The patent-pending LRP system combines variable-speed control, simple mechanics, and industry-leading control software into a compact, lightweight, unobtrusive solution. It’s a fresh approach that provides significant cost and performance benefits over conventional systems.
The LRP pumping unit mounts directly to the wellhead. The polished rod runs through a channel inside the rack and is suspended from the top by a conventional rod clamp. The rod is allowed to float inside the rack should the pump or rod stick. An induction motor, coupled to the rack-and-pinion mechanism through a gear box, cycles the rack up and down to reciprocate the rod. The rack is lubricated each stroke by submersion into a fully contained oil bath.
The secret to the LRP system is that it controls the rod string directly using the bidirectional servo-positioning capabilities of a flux vector variable-speed drive and a simple rack-and-pinion mechanism. This eliminates the cumbersome mechanics typically used to translate motion to the rod string while providing superior control. The efficient, low-inertia design uses a much smaller motor and gear box than conventional jack pumps. Programmable electronic motion profiles extend the effective stroke to that of a much larger unit. The physical size difference can be startling.
The LRP unit is extremely economical and easy to install. The total system costs a fraction of a comparable jack pump without controls. Transportation, site preparation, and installation costs are minimal. The LRP unit mounts directly to the wellhead, eliminating the need for a concrete pad and other special site preparations. It can easily be transported in a pickup truck, handled by two people, and installed with a small rig or picker. Units are up and running within two hours.
With its compact design, the LRP unit blends into the landscape where conventional pumps would be offensive or prohibited by regulation. It has a very low profile, no visible moving parts, is quiet, and nondisruptive to the well site. This makes it especially appealing for environmentally sensitive installations.
The LRP leverages Unico's patented SRP sucker-rod pump control software to optimize production and protect the pumping system. Features include superior speed control, regulation down to one stroke per minute, software-adjustable stroke length and spacing, optimized pump fill, fluid pound reduction, automated valve check, remote reporting, and more.
LRP units come in a variety of models ranging from a 32” stroke with 4,000 lb. capacity to a 56” stroke with 12,000 lb. capacity. For more information on how the LRP system can improve your operations, please contact us.
New High-Output Engine Provides Compact Gas-Powered Lift Package
The new high-output 3.0 liter GM Vortec engine has been added to the Unico GPL Gas-Powered Lift product line. This unit operates artificial lift systems with a total power capacity of 60 hp (48 kW) at an engine speed of 2,400 rpm in a 42" by 42" by 55" package. The unit offers a nice extension to the 40 hp capacity of the 1.6 liter engine in similar compact package. Both units are configured to include up to four variable-speed drives for independent operation of ESP, PCP, or SRP artificial lift applications. To learn more about the GPL Gas-Powered Lift systems, please contact us.