Browsing by Subject "Multiphase pump"
Now showing 1 - 2 of 2
Results Per Page
Sort Options
Item Efficiency and Leakage Analysis of a Twin-Screw Multiphase Pump(2014-04-01) Turhan, YusufMultiphase 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.Item Fluid Dynamic and Performance Behavior of Multiphase Progressive Cavity Pumps(2012-10-19) Narayanan, Shankar BhaskaranIt is common for an oil well to produce a mixture of hydrocarbons that flash when exposed to atmospheric pressure. The separation of oil and gas mixtures on site may prove expensive and lead to higher infrastructure and maintenance costs as well. A multiphase pump offers a good alternative with a lower capital cost and increased overall production. A Progressive Cavity Pump (PCP) is a positive displacement pump type that can be used to pump a wide range of multiphase mixtures, including high viscosity fluids with entrained gas and solid particles in suspension. Despite its advantages, a PCP has a reduced ability to handle high gas-liquid ratios due to limitations of its elastomeric stator material required to overcome thermo and mechanical effects. Also the efficiency decreases significantly with increases in gas volume fractions and reduced differential pressures. The current study focuses on studying the behavior of this unique pump in a wide range of GVFs and studying the effect of this ratio on overall efficiency, temperature and pressure distribution on the stator. The pump exhibits vibration issues at specific differential pressures and they have been studied in this work. This can be of critical value as severe vibration issues can damage the pump components such as couplings and bearings leading to high maintenance costs. Another important issue addressed by this research is the behavior of this pump in transient conditions. Oil well production is highly unpredictable with unexpected rises and drops in GVFs. These transient conditions have been simulated by varying the GVF over wide ranges and studying the pump's behavior in terms of load, temperature rises and instantaneous pressure profiles on the pump stator. This thesis provides a comprehensive study of this pump, its operating ranges and behavior in off-design conditions to assist oil and gas exploration ventures in making an informed choice in pump selection for their applications based on field conditions.