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Proceedings ArticleDOI

Wet Gas Impeller Test Facility

TL;DR: In this paper, an open-loop impeller test facility was designed to investigate the wet gas performance, aerodynamic stability, and operation range of a representative full-scale industrial impeller.
Abstract: The development of wet gas compressors will enable increased oil and gas production rates and enhanced profitable operation by subsea well-stream boosting. A more fundamental knowledge of the impact of liquid is essential with regard to the understanding of thermodynamic and fluid dynamic compressor behavior. An open-loop impeller test facility was designed to investigate the wet gas performance, aerodynamic stability, and operation range. The facility was made adaptable for different impeller and diffuser geometries. In this paper, the wet gas test facility and experimental work concerning the impact of wet gas on a representative full-scale industrial impeller are presented. The centrifugal compressor performance was examined at high gas volume fractions and atmospheric inlet conditions. Air and water were used as experimental fluids. Dry and wet gas performance was experimentally verified and analyzed. The results were in accordance with previous test data and indicated a stringent influence of the liquid phase. Air/water tests at atmospheric conditions were capable of reproducing the general performance trend of hydrocarbon wet gas compressor tests at high pressure.© 2010 ASME
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Journal ArticleDOI
TL;DR: The empirical approximation of the pressure rise is replaced with a first-principle wet-gas compressor characteristic, a nonlinear controller is designed via the Lyapunov analysis, and the local asymptotic stability is proven.
Abstract: The development and production of small gas condensate discoveries require cost-efficient boosting technologies for profitable production. Subsea wet-gas compression is a new boosting technology, capable of boosting gas condensates containing up to 5% liquid per volume, removing the need for preseparation of the gas condensate, and resulting in lower investment and maintenance cost. Wet gas significantly changes the compressor performance compared with dry gas, including changing process gain and the normal operating region, creating a challenging modeling and control problem. A wet-gas compression model with an empirical approximation of the pressure rise, including a complex backstepping controller, was recently proposed to solve these challenges. However, the model did not correctly model negative mass flows and the empirical polynomial provided limited insight into wet-gas compression. Therefore, in this article, we extend these dynamics to correctly model negative mass flows (deep surge) and, inspired by previous work on first-principle dry-gas compression modeling, we replace the empirical approximation with a first-principle wet-gas compressor characteristic. A nonlinear controller is designed via the Lyapunov analysis, and the local asymptotic stability is proven.

5 citations


Cites background from "Wet Gas Impeller Test Facility"

  • ...However, experimental results on wet-gas compression indicate that the compression performance is largely determined by the aerodynamic behavior [18]....

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  • ...Key references for the derivation are on general compressor theory [22], dry-gas compressor fundamentals and modeling [21], [32], first-principle dry-gas compressor modeling [6], [7], [29], [30], and wet-gas compression fundamentals [18], [19], [25]–[28]....

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  • ...Modeling of thermodynamic dynamics involves complex thermodynamic calculations [18]....

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  • ...However, experiments in [18] and [19] show that the presence of liquid significantly changes the compressor performance, including the process gain and the normal operating region....

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  • ...The accumulation of liquid in the centrifugal compressor prolongs the stable operating region into the surge region as the accumulated liquid acts as a buffer that adapts the compressor for smaller mass flows [18], [19]....

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Dissertation
01 Jan 2017

5 citations


Cites background or methods or result from "Wet Gas Impeller Test Facility"

  • ...On the subject of modelling wet gas compressors with the physical phenomena obtained by experiments, the work in [28, 45, 63] gives an extensive testing of the physical aspects of wet gas in centrifugal dry gas compressors....

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  • ...It is pointed out in [45], that the unshrouded design of the impeller is not applicable for wet gas test....

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  • ...However, the flow patter internally in the compressor channels is annular [45]....

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  • ...If the gas mass flow is monitored, the Gas Mass Fraction (GMF) can be calculated according to [45] as...

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  • ...The characteristic showed to resemble the properties of what has been found in experiments conducted on centrifugal dry gas compressors (see [45, 63])....

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Dissertation
01 Jan 2013
TL;DR: In this article, the development of wet gas compressors for installation subsea is key to increase the recovery of oil and gas from the Norwegian Continental Shelf, and the safe operation of the compressor depends on the availability of the subsea environment.
Abstract: The development of wet gas compressors for installation subsea is key to increase the recovery of oil and gas from the Norwegian Continental Shelf. Safe operation of the compressor depends on unde ...

3 citations

Dissertation
01 Jan 2013
TL;DR: In this paper, trykkokning vil gi gassreservoar okt produksjonsrate eller forlenget levetid, i noen tilfeller ogsa begge deler Subsea-kompresjon kan vaere et kostnadseffektivt alternativ t
Abstract: En trykkokning vil gi gassreservoar okt produksjonsrate eller forlenget levetid, i noen tilfeller ogsa begge deler Subsea-kompresjon kan vaere et kostnadseffektivt alternativ t

2 citations


Cites background from "Wet Gas Impeller Test Facility"

  • ...Takk til min hovedveileder Lars Eirik Bakken for nyttige innspill....

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  • ...Grüner og Bakken [21] antyder at det er sannsynlig at fasene ikke er i termisk likevekt etter en våtgasskompressor på grunn av den store forskjellen i varmekoe sient for gass og væske....

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  • ...Validering av våtgassytelse Håvar Nøvik Master i produktutvikling og produksjon Hovedveileder: Lars Erik Bakken, EPT Institutt for energi- og prosessteknikk Innlevert: juni 2013 Norges teknisk-naturvitenskapelige universitet...

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  • ...Elektromotoren yter maksimalt 450 kW [21]....

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  • ...1: Normale driftsparametere for NTNUs våtgasskompressor [21]...

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DOI
01 Jan 2016
TL;DR: The Wet Tolerant Impellers (WTI) as discussed by the authors is a family of centrifugal impellers specifically designed to process gas containing non negligible amounts of liquid, increasing the erosion resistance and promoting the liquid droplets breakup.
Abstract: Standard centrifugal compressors are designed to process gas with limited liquid content: significant presence of liquid may be responsible for the rapid erosion and corrosion of both static and rotating components that yield to higher failure risk and shorter maintenance periods. Moreover the presence of liquid is associated to significant modifications of machine performance and machine operability. However, the possibility of compressing gas containing non negligible amounts of liquid allows to reduce size, dimensions and costs of the liquid removal stations with a consequent positive impact on the layout of subsea compression stations. With this aim, the OEM has developed a family of centrifugal impellers, the Wet Tolerant Impellers (WTI), specifically designed to process gas containing non negligible amounts of liquid, increasing the erosion resistance and promoting the liquid droplets breakup

1 citations


Cites result from "Wet Gas Impeller Test Facility"

  • ...[15] have compared air/water performance data from the rig with corresponding results from a high-pressure hydrocarbon compressor test; the results have shown that low pressure air/water tests provide the same performance trends as high-pressure hydrocarbon tests, thus no generality is lost considering high liquid/gas density ratios....

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