Thermodynamic Model of a Twin-Screw Multiphase Pump

2002 ◽  
Author(s):  
Celso Yukio Nakashima ◽  
Silvio de Oliveira Ju´nior ◽  
Elisio F. Caetano
Keyword(s):  
Turbulent Flow ◽  
Thermodynamic Model ◽  
Production Costs ◽  
Complex Flow ◽  
Multiphase Pump ◽  
Operation Conditions ◽  
Gas Compression ◽  
Twin Screw ◽  
Absorbed Power ◽  
Flow Through

The twin-screw multiphase pump has been studied as an alternative system to substitute the conventional one (fluid separation, liquid pumping and gas compression) in petroleum boosting. By “pumping” simultaneously gas and liquid, the multiphase pump could reduce production costs in deepwater activities. This paper presents a thermodynamic model of a twin-screw multiphase pump to determine performance parameters such as: absorbed power, discharge conditions and efficiency. To overcome problems with the complex flow field inside of this novel equipment, the multiphase flow was divided into a sequence of simpler processes. Such approach helps determine energy and mass balances and enables the use of a process simulator (Hysys.Process v2.1) to construct the model. The model prediction when compared to the literature show that the assumption of a smooth turbulent flow, considering the pressure loss in the entrance and discharge of the gap, fits better the phenomena than the turbulent flow when calculating the flow through the gaps. In addition, the comparison for absorbed power indicates that the assumption of gaps filled only with liquid is not valid under all operation conditions.

Thermo-Hydraulic Model of a Twin-Screw Multiphase Pump

2004 ◽  
Author(s):  
Celso Y. Nakashima ◽  
Silvio Oliveira ◽  
Elisio F. Caetano
Keyword(s):  
Hydraulic Model ◽  
Production Costs ◽  
Temperature Profiles ◽  
Mass Balances ◽  
Multiphase Pump ◽  
Gas Compression ◽  
Twin Screw ◽  
Absorbed Power ◽  
Heavy Fractions ◽  
Fluid Separation

The twin-screw multiphase pump has been studied as an alternative equipment to substitute the conventional system (fluid separation, liquid pumping and gas compression) in petroleum boosting. By “pumping” gas and liquid together, the multiphase pump could reduce production costs, particularly in deepwater activity. This paper presents a thermo-hydraulic model of a twin-screw multiphase pump developed to determine important parameters such as: volumetric efficiency, absorbed power, discharge conditions, heat transfer and pressure and temperature profiles. The continuous movement from suction to the discharge of pump chambers is divided in small discretive steps. This division allows the calculation of energy and mass balances for each screw chamber. At each step, it is possible to calculate mass and energy that enters and leaves one chamber. With this balance, pressure and temperature for the next step can be calculated. Differently from previous model, it considers not only water-air but also hydrocarbon mixtures (including petroleum heavy fractions) as working fluids. Besides, inclusion of screw rotation influence over peripheral backflow is not neglected as in previous models.

Parallel Simulation of the Turbulent Flow Through a Pump-Turbine Runner

2002 ◽  
Author(s):  
Yu Xu ◽  
Yulin Wu
Keyword(s):  
Turbulent Flow ◽  
Message Passing Interface ◽  
Numerical Procedure ◽  
Parallel Simulation ◽  
Calculation Methods ◽  
Complex Flow ◽  
Pump Turbine ◽  
Parallel Calculation ◽  
Turbine Runner ◽  
Flow Through

In this paper, authors use the parallel calculation methods to solve the incompressible turbulent flow through a pump-turbine runner. The calculation aims at probing the road using parallel calculation methods to simulate complex flow field. The simulation is conducted based on the N-S equations, by using the k-ε model. SIMPLEC algorithm [1] is adopted in the numerical procedure with body-fitted coordination [2] and staggering grid system. The calculation is carried out on the THTF “Explore 108” Cluster Computer, where Solaris8.0 plays the roles of operating system and MPI1.2 as message-passing interface. The results of parallel simulation agree well with those of serial simulation, which shows that the parallel algorithms are feasible and useful to numerical simulation.

scholarly journals SUBSEA MULTIPHASE PUMPING SYSTEM X GAS LIFT: AN EXERGO-ECONOMIC COMPARISON

2004 ◽  
Vol 3 (2) ◽  
Author(s):  
C. Y. Nakashima ◽  
S. Oliveira Jr. ◽  
E. F. Caetano
Keyword(s):  
Offshore Platform ◽  
Production Costs ◽  
Pump System ◽  
Operational Conditions ◽  
Multiphase Pump ◽  
Pumping System ◽  
Artificial Lift ◽  
Study Results ◽  
Twin Screw ◽  
Gas Lift

This paper presents a methodology for an exergetic comparison between two artificial lift systems: a gas lift and a twin-screw multiphase pump system, and a standalone offshore platform. A software (Hysys.Process v2.1) was used to simulate an offshore platform with the artificial lift methods and calculate all properties (including exergy) of the material and energy streams. The twin-screw multiphase pump behavior was simulated with a thermodynamic model developed recently (NAKASHIMA (2000) and NAKASHIMA, OLIVEIRA and CAETANO (2002)). The operational conditions of the PETROBRAS 7- MRL-72D-RJS well operating with cited systems were predicted by an internal study conducted in PETROBRAS (BARUZZI et al. (2001a) and partially published in BARUZZI et al. (2001b)). The comparisons cover the range of 2000 to 2020, the same range adopted in the study. Results show that in general the production costs are lower when the multiphase pump is used. The main advantages of this method over the gas lift is the absence of material (gas) recycle and a better energy management.

scholarly journals SUBSEA MULTIPHASE PUMPING SYSTEM X GAS LIFT: AN EXERGO-ECONOMIC COMPARISON

2004 ◽  
Vol 3 (2) ◽  
pp. 107 ◽  
Author(s):  
C. Y. Nakashima ◽  
S. Oliveira Jr. ◽  
E. F. Caetano
Keyword(s):  
Production Costs ◽  
Pump System ◽  
Operational Conditions ◽  
Multiphase Pump ◽  
Pumping System ◽  
Artificial Lift ◽  
Study Results ◽  
Twin Screw ◽  
Gas Lift ◽  
Economic Comparison

This paper presents a methodology for an exergetic comparison between two artificial lift systems: a gas lift and a twin-screw multiphase pump system, and a standalone offshore platform. A software (Hysys.Process v2.1) was used to simulate an offshore platform with the artificial lift methods and calculate all properties (including exergy) of the material and energy streams. The twin-screw multiphase pump behavior was simulated with a thermodynamic model developed recently (NAKASHIMA (2000) and NAKASHIMA, OLIVEIRA and CAETANO (2002)). The operational conditions of the PETROBRAS 7- MRL-72D-RJS well operating with cited systems were predicted by an internal study conducted in PETROBRAS (BARUZZI et al. (2001a) and partially published in BARUZZI et al. (2001b)). The comparisons cover the range of 2000 to 2020, the same range adopted in the study. Results show that in general the production costs are lower when the multiphase pump is used. The main advantages of this method over the gas lift is the absence of material (gas) recycle and a better energy management.

HEAT TRANSFER AND PRESSURE DROP IN TURBULENT FLOW THROUGH A TUBE WITH LONGITUDINAL PERFORATED STAR-SHAPED INSERTS

2011 ◽  
Vol 18 (6) ◽  
pp. 491-502 ◽  
Author(s):  
Andrew Mintu Sarkar ◽  
M. A. Rashid Sarkar ◽  
Mohammad Abdul Majid
Keyword(s):  
Heat Transfer ◽  
Pressure Drop ◽  
Turbulent Flow ◽  
Flow Through

Heat Transfer in Turbulent Flow Through Tube with Wire-Coil Inserts

2005 ◽  
Vol 12 (4) ◽  
pp. 385-394 ◽  
Author(s):  
M. A. Rashid Sarkar ◽  
M. Zaidul Islam ◽  
M. A. Islam
Keyword(s):  
Heat Transfer ◽  
Turbulent Flow ◽  
Wire Coil ◽  
Flow Through

CALCULATIONS OF TURBULENT FLOW THROUGH A STAGGERED TUBE BANK

2017 ◽  
Author(s):  
Branislav Basara ◽  
Sinisa Krajnovic ◽  
Guglielmo Minelli
Keyword(s):  
Turbulent Flow ◽  
Tube Bank ◽  
Flow Through

On LES Methods Applied to Seal Geometries

2012 ◽  
Author(s):  
James Tyacke ◽  
Richard Jefferson-Loveday ◽  
Paul Tucker
Keyword(s):  
Maximum Error ◽  
Labyrinth Seal ◽  
Navier Stokes ◽  
Final Solution ◽  
Complex Flow ◽  
Eddy Simulation ◽  
Wide Range ◽  
Large Eddy ◽  
Rans Models ◽  
Flow Through

Nine Large Eddy Simulation (LES) methods are used to simulate flow through two labyrinth seal geometries and are compared with a wide range of Reynolds-Averaged Navier-Stokes (RANS) solutions. These involve one-equation, two-equation and Reynolds Stress RANS models. Also applied are linear and nonlinear pure LES models, hybrid RANS-Numerical-LES (RANS-NLES) and Numerical-LES (NLES). RANS is found to have a maximum error and a scatter of 20%. A similar level of scatter is also found among the same turbulence model implemented in different codes. In a design context, this makes RANS unusable as a final solution. Results show that LES and RANS-NLES is capable of accurately predicting flow behaviour of two seals with a scatter of less than 5%. The complex flow physics gives rise to both laminar and turbulent zones making most LES models inappropriate. Nonetheless, this is found to have minimal tangible results impact. In accord with experimental observations, the ability of LES to find multiple solutions due to solution non-uniqueness is also observed.

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