Online estimation of reject gas flow rates in compact flotation units for produced water treatment: A feasibility study

Arvoh, Benjamin Kaku; Asdahl, Steinar; Rabe, Karsten; Halstensen, Maths

doi:10.1016/j.chemolab.2012.03.008

Cited by 7 publications

(5 citation statements)

References 20 publications

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“…Please refer to Arvoh et al, 34 Arvoh et al 35 ). The CFU is maintained at a pressure of P CF U with a volumetric liquid hold-up of α l .…”

Section: Overflowmentioning

confidence: 99%

“…33 Other control oriented models for CFUs in the literature are data driven. Please refer to Arvoh et al, 34 Arvoh et al, 35 and Asdahl and Rabe 36 for an overview of data driven models for CFUs and their uses.…”

Section: Industrial and Engineering Chemistry Researchmentioning

confidence: 99%

“…A sensor for measuring gas fraction in the reject stream is assumed to be available that can accurately sense gas fraction in a range of 25−75%. For a method on gas fraction estimation in reject stream from CFU, refer to Arvoh et al 34 We keep a 20% back-off from both upper and lower limits so as to provide a larger window of accurate gas fraction measurement around the gas fraction set-point under transient conditions. Hence, we constrain the α gas top between 45% and 55%.…”

Section: Industrial and Engineering Chemistry Researchmentioning

confidence: 99%

See 2 more Smart Citations

Optimal Operation of a Subsea Separation System Including a Coalescence Based Gravity Separator Model and a Produced Water Treatment Section

Das

Heggheim

Dudek

et al. 2019

Ind. Eng. Chem. Res.

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In this work, we develop a model for a gravity separator, and use it together with models from literature to study the control of a subsea separation system that separates oil, gas and water from well fluids in hydrocarbon production. Our separation system contains a gravity separator, hydrocyclones and compact flotation units. The main contributions of the paper are twofold. First, we present a coalescence based dynamic gravity separator model, which is able to predict oil concentration in water outlet and water concentration in oil outlet. Second, we study optimal operation of the overall separation system with an objective of maximizing water removal. We propose a simple control structure that operates the process close to optimally, by rejecting disturbances from upstream flows and maintaining a tight control of the quality of the purified water leaving the system.

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“…Please refer to Arvoh et al, 34 Arvoh et al 35 ). The CFU is maintained at a pressure of P CF U with a volumetric liquid hold-up of α l .…”

Section: Overflowmentioning

confidence: 99%

Section: Industrial and Engineering Chemistry Researchmentioning

confidence: 99%

Section: Industrial and Engineering Chemistry Researchmentioning

confidence: 99%

See 1 more Smart Citation

Optimal Operation of a Subsea Separation System Including a Coalescence Based Gravity Separator Model and a Produced Water Treatment Section

Das

Heggheim

Dudek

et al. 2019

Ind. Eng. Chem. Res.

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“…Due to a low residence time in compact separation equipment and due to several degrees of freedom in operation, these compact systems, in comparison to conventional separation technologies, are more difficult to operate, and require more advanced control strategies. , Control of CFUs has been studied experimentally by Asdahl and Rabe and Arvoh et al, , who analyze the effect of changing the reject valve position and CFU pressure on gas and liquid reject flow rates. These relationships helped them to develop a control system for CFU that optimizes separation efficiency and reject flow rate, and minimizes flotation gas usage using an automatic empirical approach .…”

Section: Introductionmentioning

confidence: 99%

Simplified First-Principles Model of a Compact Flotation Unit for Use in Optimization and Control

Das

Jäschke

2018

Ind. Eng. Chem. Res.

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In this paper, we develop a simplified control-oriented model of a compact flotation unit (CFU), which removes residual oil from produced water in oil and gas production systems. CFU is a class of separators that exploits the synergy between separation effects of a swirling flow and the effect of flotation, in which small gas bubbles attach to the oil droplets, and float to the top of the separator, where they are removed. The purified water flows downwards, and is removed from the bottom. Our CFU model consists of a simplified initial swirl separation part, and a flotation part, in which populations of oil droplets, gas bubbles without oil droplet, and gas bubbles with oil droplet attached are tracked spatially. After analyzing the model, we use it as a basis for designing a control structure that operates the separation system optimally.

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“…Literature on the adaptation of the developed acoustic chemometric principle as an alternative process monitoring solution in the oil industry is limited since its inception. Arvoh et al [13,14], adapted the acoustic chemometric technique for online estimation of both the reject gas and liquid flow rates in a compact flotation unit for produced water treatment. From that study, it was clear that the potential application of this technique in the oil industry is bright.…”

Section: Introductionmentioning

confidence: 99%

Online estimation of wax deposition thickness in single-phase sub-sea pipelines based on acoustic chemometrics: A feasibility study

Halstensen

Arvoh

Amundsen

et al. 2013

Fuel

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Wax deposition in sub-sea oil producing pipelines is a concern to the oil producing companies. The deposition of wax in pipelines can cause serious economic implications if not monitored and controlled. Several researchers have developed models and investigated the deposition of wax in crude oil pipelines. As of today, there is no off the shelf instrument available for reliable online estimation of the wax deposition thickness in sub-sea pipelines.Acoustic chemometrics was applied to investigate the potential for online estimation of wax deposition thickness in sub-sea pipelines. This feasibility study was carried out as a so called piggy back on experiments performed at Statoil research centre in Porsgrunn, Norway with real crude oil or waxy gas condensate. The first investigations focussed on the repeatability of the acoustic chemometric technique followed by online prediction of the wax deposition thickness in a single-phase oil flow pipeline. A partial least squares regression model was calibrated and validated with a totally independent data set. The calibrated model had a root mean squared error of prediction of 0.28 mm with a final wax deposition thickness of 3.36 mm, a slope of 0.91 and R 2 of 0.83 which were satisfactory results. The effect of varying oil flow rates on the wax deposition thickness was also investigated. The preliminary results showed the need for further investigations based on a robust experimental design and sample  Corresponding author: e-mail: maths.halstensen@hit.no, Tel: +47 35575187, Telefax: +47 35575001 3 pre-processing. The general conclusion that can be drawn from this feasibility study was that the potential of adapting the acoustic chemometric technique for online estimation of the wax deposition thickness exist and must be further investigated.

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Online estimation of reject gas flow rates in compact flotation units for produced water treatment: A feasibility study

Cited by 7 publications

References 20 publications

Optimal Operation of a Subsea Separation System Including a Coalescence Based Gravity Separator Model and a Produced Water Treatment Section

Optimal Operation of a Subsea Separation System Including a Coalescence Based Gravity Separator Model and a Produced Water Treatment Section

Simplified First-Principles Model of a Compact Flotation Unit for Use in Optimization and Control

Online estimation of wax deposition thickness in single-phase sub-sea pipelines based on acoustic chemometrics: A feasibility study

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