Artificial Lift Techbook 2019

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Page 56 of 59 | April 2019 | 55 ARTIFICIAL LIFT: CASE STUDIES removal from the well. With the liquids removed from the well, and the absence of the backpressure counteracting on gas reservoirs, gas production will further increase. The closed loop of the virtuous cycle of enhanced liquid removal (Figure 4) can only be enabled by the higher gas velocities and lower pressure generated by the subsurface compressor. 'Protector-less' architecture The downhole portion of the subsurface compressor is composed of three modules, namely the hydraulic unit, bearing unit and motor unit. The motor unit contains a permanent magnet motor as the prime mover of the subsurface com- pressor. To compress gas, the rotation speed of the subsurface compressor is set at 50,000 rpm, which is much higher than 3,600 rpm of a typical electric submersible pump to move liquids. The motor is filled with low-pressure inert gas and hermetically sealed from the downhole environment by an isolation can. More importantly, no downhole fluid or debris can get into the hermetically sealed motor unit, avoiding the electrical or contact bearing failures associated with such exposure. The Upwing SCS combines magnetic technology building blocks into a "protector-less" architecture for the harsh downhole environment. (Image courtesy of Upwing Energy) FIGURE 1 FIGURE 2 FIGURE 3 FIGURE 4

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