The electro-hydraulic downhole pump drive R7 from Rexroth is built up of a hydraulic cylinder mounted directly on the well head tubing and a hydraulic power unit (HPU). The HPU consists of an axial piston unit (A), e-motor (E) with integrated flywheel (S) and system control (AS). The upward and downward movement of the downhole pump produces the crude oil from the well. The drive system is CE-approved and meets the safety requirements of the machinery directive 2006/42/EC. The cylinder and the mounting frame are in compliance with Atec equipment directive 94/9/EC.
With the hydraulically driven crude oil pump R7 Bosch Rexroth provides an advance technology to the mechanical crude oil pump.
The R7 equipment operates independently from the sinusoidal v/t function. The maximum lifting speed is not limited by the maximum lowering speed. Simple individual adjustments of the cycle times are possible, as well as fast optimization of cylinder stroke to the production conditions of the well.
The efficiency of the crude oil downhole pump drive is determined by the evaluation of a dynagram. The current motion sequence can be saved within the R7 system control, and the dynogram showed on the installed screen can be directly imported into an Excel table. This function allows the immediate overview and optimization of various settings of the R7 unit.
Continuous monitoring and limiting of the cylinder force prevents an overload or a break of the sucker rods. In the event of too much resistance in the drill hole, the drive does not switch off but starts a creep speed movement in the opposite direction. This results in reduced downtimes of the equipment.
Due to the low weight and the low space requirements, the transport and the installation of the R7 equipment can be executed quickly and with minimal effort.
|Rexroth type||Combination 1 Stroke (In)/spm||Combination 2 Stroke (In)/spm||Combination 3 Stroke (In)/spm||Power (kW) @ 60Hz||Force (lbs) |
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Further sizes are available upon requests