scholarly journals Energy Performance and Pressure Fluctuation of a Multiphase Pump with Different Gas Volume Fractions

Energies ◽  
2018 ◽  
Vol 11 (5) ◽  
pp. 1216 ◽  
Author(s):  
Jinsong Zhang ◽  
Lei Tan
Keyword(s):  
Pressure Fluctuation ◽  
Energy Performance ◽  
Multiphase Pump ◽  
Volume Fractions ◽  
Gas Volume

Leakage Loss Study of a Synchronal Rotary Multiphase Pump With a Full Range of Inlet Gas Volume Fractions

2016 ◽  
Vol 138 (7) ◽  
Author(s):  
Xu Yang ◽  
Yao Qin ◽  
Zongchang Qu
Keyword(s):  
Flow Rate ◽  
Flow Model ◽  
Full Range ◽  
Volumetric Flow Rate ◽  
Radial Clearance ◽  
Leakage Flow ◽  
Leakage Loss ◽  
Multiphase Pump ◽  
Volume Fractions ◽  
Gas Volume

The working performance of the synchronal rotary multiphase pump (SRMP), alike other types of positive-displacement multiphase pumps, is strongly affected by leakage loss. In this paper, the leakage loss in the SRMP with a full range of inlet gas volume fractions (GVFs) was theoretically and experimentally investigated. The leakage flows in the SRMP were modeled as the one-dimensional gas–liquid flows through narrow gaps. Two types of leakage flow models, homogeneous leakage flow model (HLFM) and separated leakage flow model (SLFM), were developed. The experimental work was conducted to measure the volumetric flow rate of the SRMP using the mixtures of air and N32 oil as working fluids under various inlet GVFs and differential pressures. Comparisons between the simulated and experimental pump flow rates showed that both the accuracies of the HLFM and SLFM related to the inlet GVF. In addition to the differential pressure, the leakage loss of the SRMP was affected by the inlet GVF. The leakage flow rate increased with the inlet GVF due to the changes in physical properties of the gas–liquid leakage flow. Parametric analysis showed that leakage loss in the SRMP can be effectively reduced by reducing the rotor radial clearance without much effect on its mechanical efficiency, whereas the optimum geometric parameters of the rotor and cylinder must be calculated by means of the optimization study with consideration of both the leakage loss and friction loss.

Evaluation of a Twin Screw Pump for Use in High Gas Volume Fraction Flows

2012 ◽  
Author(s):  
Gerald L. Morrison ◽  
Abhay Patil ◽  
Daniel Cihak
Keyword(s):  
Volume Fraction ◽  
Pressure Rise ◽  
Maintenance Cost ◽  
Pure Liquid ◽  
Pump Efficiency ◽  
Screw Pump ◽  
Multiphase Pump ◽  
Volume Fractions ◽  
Twin Screw ◽  
Gas Volume

The use of multiphase pumps on gas and oil wells which have Gas Volume Fractions (GVF) between 50 and 100% have been shown to have practical applications[1]. A single multiphase pump can replace a separation system, gas compressor, and liquid pump. This can significantly reduce installation cost, maintenance cost, and the space occupied by the system. By reducing the well head pressure, additional production can also be obtained. This work investigates the ability of a 200 hp, 635 gpm twin screw pump designed for use as a multiphase pump to operate over a range of gas volume fractions, inlet pressure, pressure rise, and operating speed. GVF’s from 50% to 100% are considered with inlet pressures from 15 to 100 psig. The pump pressure rise is varied from 50 to 300 psig for operating speeds of 900, 1350, and 1800 rpm. The working fluids for this evaluation are air and water. Each are separately measured prior to injection into the pump inlet. Electrical power consumed along with pressure and temperature measurements across the pump allow the evaluation of pump efficiency, hydraulic performance, volumetric efficiency, and effectiveness (reduction in hydraulic efficiency from pure liquid performance).

scholarly journals Energy performance and flow characteristics of a multiphase pump with different tip clearance sizes

2019 ◽  
Vol 11 (1) ◽  
pp. 168781401882335 ◽  
Author(s):  
Jinsong Zhang ◽  
Honggang Fan ◽  
Wei Zhang ◽  
Zhifeng Xie
Keyword(s):  
Volume Fraction ◽  
Flow Characteristics ◽  
Energy Performance ◽  
Tip Clearance ◽  
Leakage Flow ◽  
Great Success ◽  
Tip Leakage Flow ◽  
Multiphase Pump ◽  
Gas Volume Fraction ◽  
Gas Volume

Deep sea oil resources worldwide possess great potential for exploration; however, multiphase medium technology requires urgent development. The multiphase pump has achieved great success as one of the most advanced machinery in underwater oil and gas exploration. Tip clearance is inevitable between the rotating and stationary components of the multiphase pump. In this study, tip clearance sizes of 0.0, 0.2, 0.5, and 0.8 mm are selected to investigate the effect of tip clearance on energy performance and flow characteristics of a multiphase pump. Results show that pressure rises decrease by 10.72%, 24.96%, and 41.39% with gas volume fraction = 0% under different tip clearance sizes, while the pressure rises decrease by 17.10%, 25.35%, and 38.11% with gas volume fraction = 10%. The dominant frequencies and maximum amplitudes of pressure fluctuation rise with the increase in tip clearance. The entrainment effect between the tip leakage flow and main flow in the impeller strengthens with the increase in tip clearance size; the induced vortex area and leakage flow rate also increase.

Characteristic Analysis of Pressure Fluctuation in a Three-Stage Rotodynamic Multiphase Pump

2014 ◽  
Author(s):  
Jinya Zhang ◽  
Shujie Cai ◽  
Hongwu Zhu ◽  
Rui Qiang
Keyword(s):  
Pressure Fluctuation ◽  
Rotational Speed ◽  
Volume Fraction ◽  
Bench Test ◽  
Middle Section ◽  
Characteristic Analysis ◽  
Multiphase Pump ◽  
Gas Volume Fraction ◽  
Two Stages ◽  
Gas Volume

In order to investigate the pressure fluctuation in a three-stage rotodynamic multiphase pump developed by authors, a bench test is set which choose the mixture of water and air as medium. Nine monitors are set in the pump including the inlet of each impeller, the interfaces of the rotor-stator and the middle section of each impeller. It turns out that the minimum pressure fluctuation is located in the interfaces of the rotor-stator in each stage and the maximum is in the interface of two stages. The domain frequency is the blade passing frequency of the impeller and its multipliers and there is no higher frequency. The coefficients of the pressure fluctuation is first decreased and then increased with the increase of the inlet gas volume fraction at the same rotational speed. But it increases with the increase of rotational speed at the same inlet gas volume fraction.

scholarly journals Phase Distribution in the Tip Clearance of a Multiphase Pump at Multiple Operating Points and Its Effect on the Pressure Fluctuation Intensity

Processes ◽  
2021 ◽  
Vol 9 (3) ◽  
pp. 556
Author(s):  
Guangtai Shi ◽  
Zongku Liu ◽  
Xiaobing Liu ◽  
Yexiang Xiao ◽  
Xuelin Tang
Keyword(s):  
Phase Velocity ◽  
Pressure Fluctuation ◽  
Phase Distribution ◽  
Tip Clearance ◽  
Tip Leakage Flow ◽  
Two Phase ◽  
Multiphase Pump ◽  
Fluctuation Intensity ◽  
Operating Points ◽  
Multiple Operating Points

Tip clearance has a great effect on the flow and pressure fluctuation characteristics in a multiphase pump, especially at multiple operating points. The phase distribution and pressure fluctuation in tip clearance in a multiphase pump are revealed using the CFD (computational fluid dynamics) technology and high-speed photography methods. In this paper, the phase distribution, the gas-liquid two-phase velocity slip, and the pressure fluctuation intensity are comprehensively analyzed. Results show with the increase of the tip clearance, the multiphase pump pressurization performance is obviously deteriorated. In the meantime, the gas accumulation mainly occurs at the hub, the blade suction side (SS), and the tip clearance, and the maximum gas-liquid two-phase velocity difference is near the impeller streamwise of 0.4. In addition, the tip clearance improves the gas-liquid two-phase distribution in the pump, that is, the larger the tip clearance is, the more uniform the gas-liquid distribution becomes. Furthermore, the gas leads to the maximum pressure fluctuation intensity in the tip clearance which is closer to the tip leakage flow (TLF) outlet, and has a greater effect on the degree of flow separation in the tip clearance.

scholarly journals Proposal of a stage-by-stage design method and its application on a multi-stage multiphase pump based on numerical simulations

2021 ◽  
Vol 13 (1) ◽  
pp. 168781402098731
Author(s):  
Yi Shi ◽  
Hongwu Zhu
Keyword(s):  
Volume Fraction ◽  
Design Method ◽  
Oil Field ◽  
Stage Design ◽  
Multiphase Pump ◽  
Flow Parameters ◽  
Multi Stage ◽  
Comparison Results ◽  
Third Stage ◽  
Gas Volume

Rotodynamic multiphase pumps are usually equipped with many compression units to provide sufficient boosting pressure for the transportation of production fluid in gas oil field. It is a challenge to maintain pump performance while flow parameters in each stage vary due to the compressibility of gas-liquid phase. In this article, a stage-by-stage design method is proposed to improve the boosting capability of a multiphase pump. Variations of flow parameters in each stage are investigated based on computational fluid dynamics (CFD) numerical simulation. Available methods to determinate main impeller geometry parameters of impeller are discussed. The stage-by-stage design method is applied on a five-stage multiphase pump when the inlet gas volume fraction (GVF) are 30% and 50% separately. The second stage is modified base on its corresponding inlet flow parameters when inlet GVF is 30% while the second and third stage are modified when inlet GVF is 50%. Flow parameters, pressure distribution and velocity distribution are compared between the original pump and modified pump. Differential pressure of the modified pump increases by 53.72 kPa and 58.57 kPa respectively when inlet GVFs are 30% and 50%. The feasibility of the stage-by-stage design method is verified through the comparison results.

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