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SKID MOUNTED PUMPS PRODUCTS
In the sucker rod artificial lifting method a pumping unit is a mechanism which imparts reciprocating motion to a polished rod to which is attached the rod string and the plunger of the bottom hole pump.
The beam type pumping units are limited to a stroke length of ±15 feet (or 4.5 m).
Beginning in the 1970s, the first vertical long stroke pumping unit appeared on the market: It was an electro mechanical unit capable of a stroke length up to 394”.
During the last decade the long stroke technology improved and the new generation is available as surface hydraulic long stroke pumping units capable of stroke length up to 336” (or 8.5 m) and completely assisted by VSD and PLC.
Dajan is in the position to rent/sell the innovative hydraulic surface (skid) mounted artificial lift system for oil and gases that are lighter, lower in cost and more energy efficient with greater lifting capacity compared to conventional lift systems.
The proposed hydraulic surface-mounted artificial lift system that is used to extract fluids from both shallow and deep wells to produce crude oil or dewatering for natural gas production. It works in conjunction with a bottomhole pump and rod string. It is comprised of two main components:
The pumping units are available ranging from a 25,000 lbs. of lift capacity and 240” stroke length to 40,000 lbs. lift capacity and a 288” stroke length. The Pumping Unit is comprised of a triple chamber hydraulic cylinder, a heavy duty structural base, a counterbalance vessel containing nitrogen gas under pressure, and a pulley/wire rope lift mechanism which doubles sucker rod stroke relative to cylinder travel. The counterbalance can be adjusted at the well simply by adjusting the pressure of the gas in the storage vessel. The direction and speed of the pump is then controlled by sending hydraulic fluid under pressure to either the up or the down chambers of the cylinder. Since the pump is computer controlled, the speed and stroke limits can be independently established, thereby allowing for independent speeds for the up and down stroke.
Multiple horsepower options per Pumping Unit model are available up to 150 Hp. The Power Unit provides the driving force and control for the Pumping Unit. It is comprised of a hydraulic system, variable speed drive (VSD) control and a computer control system (PLC). The system utilizes many sensor mechanisms to provide optimum stroke control and full monitoring of well and pump conditions. The self-monitoring system provides warnings of impending failure conditions, both at the surface and down-hole, and stops the pump prior to a catastrophic failure. The system includes a sealed hydraulic reservoir and various valves for precise control of the cylinder throughout the pumping cycle. The Power Unit is connected to the Pumping Unit by means of high-pressure hoses and electronic control circuitry. The electronics include computer controls that allow for the pump to be controlled by closed loop feedback for precise operation of stroke speed and position.
The next tables show the max stroke length and lifting capacity for the models of pumping unit:
| Pumping Unit Model | D7 / 250 | D9 / 400 |
|---|---|---|
| Stroke Length | 240" | 288" |
| Lift Capacity | 25,000lbs | 40,000lbs |
