301 Twin-Screw Multiphase Pump Characteristics and Pressure Measurement on Casing Wall

Abstract This paper describes Kvaerner’s prototype subsea multiphase pump system and the DEMO 2000 development program (current test completion date 2nd Q2001). Reference is also made to service proven sub-systems, components and subsea expertise incorporated into the pump module and system design. Availability and reliability consideration together with novel plans for the future is presented. The Subsea Multiphase Pump and motor are packaged into a modular system solution that is readily adaptable to template and manifold configurations and maximises the use of existing qualified components and sub-systems. A guidewireless system is adopted and Kvaerner’s design ensures self-alignment upon installation at simple flowbase interfaces, making it ideal for deepwater applications. Due to the individual 40 tonne weight, and moonpool dimensions, of both flow base and pump module, light monohull vessels can be utilised to execute installation and retrieval. The pump unit is Bornemann twin-screw design, service proven and modified for subsea use up to 2000-meter water depth, driven by an oil-filled Loher electric motor that provides efficient power with corresponding low weight. Some main pump features are flexible operation covering all gas-liquid ratios together with tolerance for slug flow and some sand. Of particular importance, compared to centrifugal pump designs, the twin-screw volumetric arrangement is able to maintain the pressure boost specification independent of gas content at the pump inlet, and without an upstream mixing tank.

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Field Experience with the First Twin-Screw Multiphase Pump in a Saudi Arabia Oil Field

10.2523/17112-ms ◽

2013 ◽

Author(s):

Rayid S. Al-Anazi ◽

Shaleh M. Al-Ajmi ◽

Esshaq M. Al-Hasan ◽

Mohammed H. Al-Buali

Keyword(s):

Saudi Arabia ◽

Field Experience ◽

Oil Field ◽

Multiphase Pump ◽

Twin Screw

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Heat transfer in a twin-screw multiphase pump: Thermal modeling and one application in the petroleum industry

Energy ◽

10.1016/j.energy.2006.03.007 ◽

2006 ◽

Vol 31 (15) ◽

pp. 3415-3425 ◽

Cited By ~ 12

Author(s):

Celso Y. Nakashima ◽

Silvio de Oliveira ◽

E.F. Caetano

Keyword(s):

Heat Transfer ◽

Thermal Modeling ◽

Petroleum Industry ◽

Multiphase Pump ◽

Twin Screw

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

Revista de Engenharia Térmica ◽

10.5380/ret.v3i2.3531 ◽

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.

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

Volume 1: Symposia, Parts A and B ◽

10.1115/fedsm2012-72179 ◽

2012 ◽

Cited By ~ 2

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).

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