Optimal Design of Two- and Three-Phase Separators: A Mathematical Programming Formulation

Grødal, Evert O.; Park, Jongwoo

doi:10.2118/56645-ms

Cited by 12 publications

(6 citation statements)

References 14 publications

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“…( 11) is calculated as the sum of the lengths of the separator inlet section, gravity settling section, and separator outlet section as shown in Eq. (16). The length of the separator inlet is usually the length required to mount the inlet device which should be at least twice the diameter of the separator inlet [30].…”

Section: Objective Functionmentioning

confidence: 99%

“…They are mostly used to determine the effect of the separator internals from which modifications can be made to improve the performance of the separator [13,14,15]. Computational algorithm models [16,17]involve mathematical programming techniques that are flexible and can be assessed to determine the optimality of generated designs. These models unlike CFD models are used to determine the dimensions of the separator.…”

Section: Introductionmentioning

confidence: 99%

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Design and capital cost optimisation of three-phase gravity separators

Ahmed

Russell

Makwashi

et al. 2020

Heliyon

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The separation of produced fluids is essential once it reaches the surface. This separation is achieved in gravity separators. The design and sizing of separators can be challenging due to the number of factors involved. Improper separator design can bottleneck and reduce the production of the entire facility. This paper describes the development of a capital cost optimisation model for sizing three phase separators. The developed model uses GRG Non-linear algorithms to determine the minimum cost associated with the construction of horizontal separators subject to four sets of constraints. A numerical sizing example was solved to provide the details associated with the model and the ease with which parameters can be varied to suit the user's needs. Finally, a spreadsheet comparison between results obtained from the developed model and four other extant models is carried out. Results indicated that the developed model predicted results within an absolute error of AE5m 3 in most cases and a maximum of AE12.5m 3 for very high gas flows in comparison to conventional models developed based on retention time theory.

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Section: Objective Functionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Design and capital cost optimisation of three-phase gravity separators

Ahmed

Russell

Makwashi

et al. 2020

Heliyon

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“…In more-systematic procedures, droplet-settling theory is applied for evaluating vapor/liquid-or liquid/liquid-separation requirements, and adequate retention times may be assumed on the basis of experience, scale-model predictions, or field data. Grødal and Realff (1999) developed a software package for automatic design of twophase and three-phase separators. The design procedure was based on droplet-settling theory, and the optimum solution was determined by applying sequential quadratic-programming techniques.…”

Section: Redesign Of the Gullfaks-a Separatormentioning

confidence: 99%

“…As stated by Grødal and Realff (1999), the most-comprehensive approach among the classic methods was proposed by Svrcek and Monnery (Svrcek and Monnery 1993;Monnery and Svrcek 1994). In their approach, an algorithmic method was developed on the basis of accepted industrial guidelines, and the optimum (mosteconomical) multiphase separator was designed through iteration (for horizontal separators) or height adjustment (for vertical separators).…”

Section: Redesign Of the Gullfaks-a Separatormentioning

confidence: 99%

Computational Fluid Dynamics-Based Study of an Oilfield Separator--Part II: An Optimum Design

Laleh

Svrcek

Monnery

2013

Oil and Gas Facilities

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This paper provides details of comprehensive computational-fluiddynamics (CFD)-based studies performed to overcome the separation inefficiencies experienced in a large-scale three-phase separator. It will be shown that the classic design methods are too conservative and would result in oversized separators. In this study, effective CFD models are developed to estimate the phaseseparation parameters that are integrated into an algorithmic design method to specify a realistic optimum separator. The CFD simulations indicated that noticeable residence times are required for liquid droplets to penetrate through the interfaces, and liquid droplets would be entrained again from the liquid/liquid-interface vicinity by the continuous liquid phase.

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“…But the minute bubble-removal efficiency of a traditional gravitational separator is not obvious. On the contrary, applying a centrifugal gas-liquid separator can achieve the gas-removal purpose by leading to the velocity difference between fluids with distinct density to the extent that gas can be removed from liquid (Gomez et al, 1999(Gomez et al, , 2000Grødal and Realff, 1999;Wang et al, 2000Wang et al, , 2001Wang et al, , 2002Kouba et al, 2006).…”

Section: Introductionmentioning

confidence: 99%

Study on a Surface Gas-Removing System for Weight Drilling Fluid

Zhu

Lei

Liu

et al. 2011

Petroleum Science and Technology

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A gravitational separator is often used to remove gas in contaminated drilling fluid during conventional drilling but fails to meet the gas-removing need for weight drilling fluid and to maintain the stable property of fluid by high viscosity for high-pressure gas formation. Therefore, it is essential to research the surface gas-removal system. According to the existing gravitational separator and centrifugal separator structure, computational fluid dynamics (CFD) simulation technology is applied to show the flowfield characteristics of a gravitational separator and centrifugal separator, and a numerical simulation scheme was designed using an orthogonal design method. Range analysis and variance analysis were used to determine the independent factors, such as air bubble diameter and fluid viscosity. Then, based on the numerical simulation results under the separator structure and working condition, the laboratory simulation platform was designed. By comparing numerical calculation with in-house laboratory investigation, the results show that the calculated change tendency of gas-removal efficiency is in agreement with the obtained result from by laboratorial tests on the whole. The design of a double-stage gas-removal system is preferable to dealing with the gas-contaminated weight drilling fluid, which can remarkably raise the gas-removal efficiency. Under laboratory conditions, the doublestage gas-removal system obtained a maximal amplitude beyond 15% compared with the one-stage system, and the separated density was close to the unaerated density. Numerical simulation was helpful for optimizing the structure and determining the best working conditions.

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Optimal Design of Two- and Three-Phase Separators: A Mathematical Programming Formulation

Cited by 12 publications

References 14 publications

Design and capital cost optimisation of three-phase gravity separators

Design and capital cost optimisation of three-phase gravity separators

Computational Fluid Dynamics-Based Study of an Oilfield Separator--Part II: An Optimum Design

Study on a Surface Gas-Removing System for Weight Drilling Fluid

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