Efficiency and Leakage Analysis of a Twin-Screw Multiphase Pump
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Multiphase twin-screw pumps have become an important alternative to produce the oil and natural gas from wells. In comparison to a conventional multiphase oil production systems, a multiphase twin screw pump provides larger boost with smaller footprint and less maintenance costs. Therefore, it is very crucial to analyze conducted experiments in the past in different ways with respect to demand of the twin-screw multiphase production systems. The analysis of the Leistritz twin-screw pump data is formed by two sections. The first data is achieved by Texas A&M University Turbomachinery Laboratory with water-air mixture experiment; other data is achieved by Louisiana State University with water-methane experiment. In the first section, these experiments with different working fluids are analyzed. The similarities and differences which are caused by the working fluid difference, the operation differences and the instrumentation differences are considered. Since the experiment results must be limited by the nature of the pump, the experiment setup problems and their reasons are considered in the comparison part. The function of the liquid re-circulation instrumentation significance is highlighted in the first section. In the second part, the leakage flow whose direction is from the pressure side to the suction side of the pump is investigated. The leakage flow and its properties are modeled with respect to Leistritz screw pump geometry and some thermodynamics and fluid mechanics tools. Furthermore, the leakage models are used to calculate the mechanical efficiency with the single-phase experiment data. The TAMU experiment results are used to evaluate the accuracy of the leakage models. The leakage models show their accuracy in terms of the volumetric and mechanical efficiency. With considering and applying recommendations, the built leakage models can be used to predict the volumetric and mechanical efficiencies of a Leistritz twin-screw pump.