Challenges in slug modeling and control for offshore oil and gas productions: A review study

Pedersen, Simon; Løhndorf, Petar Durdevic; Yang, Zhenyu

doi:10.1016/j.ijmultiphaseflow.2016.07.018

Cited by 70 publications

(35 citation statements)

References 26 publications

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“…Water and air are commonly used in the researches for gas/liquid flow . The liquid phase in the gas pipe is mainly composed of water.…”

Section: Methodsmentioning

confidence: 99%

“…In most cases, the slug is an undesired flow regime in the pipeline system, such as offshore well‐pipeline‐riser system and pipelines in hilly areas. The negative consequences of slug flow on the production facilities include liquid overflow in the separators, overload on gas compressors, fatigue caused by repeating impact, increased corrosion, and production slop . This paper is focusing on the impacting forces caused by slug flow.…”

Section: Introductionmentioning

confidence: 99%

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Modelling and analysis of impact forces acting on elbow in gas–liquid slug flow

Xiao

Jing

Han³

et al. 2018

Asia-Pacific J Chem Eng

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The impact forces caused by gas-liquid slug flow can lead to the vibration of process system or fatigue failure of pipe fittings. In this study, a piston-flowmodel coupling with slug model is developed to calculate the impact forces, which can contribute to the structure design and flow assurance. An experiment installation is installed to study the characteristics of slug flow and validate the reliability of the model. The accuracy of this model is above 90% for the superficial velocity of gas below 2 m/s, whereas the average deviation is 29.2% for the cases of superficial velocity of gas above 2 m/s. The modified model addressing the liquid holdup agrees well with the experimental data, of which the average deviation is 6.25%.

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“…Water and air are commonly used in the researches for gas/liquid flow . The liquid phase in the gas pipe is mainly composed of water.…”

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Modelling and analysis of impact forces acting on elbow in gas–liquid slug flow

Xiao

Jing

Han³

et al. 2018

Asia-Pacific J Chem Eng

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“…Hence, the states describe the masses of gas and liquid in both the pipeline and the riser, respectively. The four state equations of the model are based on the following mass balance equations:ẋ 1 = ω g,in − ω g (1)…”

Section: Low-dimensional Modelingmentioning

confidence: 99%

“…A typical offshore oil & gas pipeline system consists of three connected subsections: The production well, the subsea transport pipeline, and the vertical riser [1]. In the well-pipeline-riser severe slugs can occur, caused by running conditions where the inlet flow rates and pressure are low.…”

Section: Introductionmentioning

confidence: 99%

Comparison of Model-Based Control Solutions for Severe Riser-Induced Slugs

et al. 2017

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Control solutions for eliminating severe riser-induced slugs in offshore oil & gas pipeline installations are key topics in offshore Exploration and Production (E&P) processes. This study describes the identification, analysis and control of a low-dimensional control-oriented model of a lab-scaled slug testing facility. The model is analyzed and used for anti-slug control development for both lowpoint and topside transmitter solutions. For the controlled variables' comparison it is concluded that the topside pressure transmitter (P t ) is the most difficult output to apply directly for anti-slug control due to the inverse response. However, as P t often is the only accessible measurement on offshore platforms this study focuses on the controller development for both P t and the lowpoint pressure transmitter (P b ). All the control solutions are based on linear control schemes and the performance of the controllers are evaluated from simulations with both the non-linear MATLAB and OLGA models. Furthermore, the controllers are studied with input disturbances and parametric variations to evaluate their robustness. For both pressure transmitters the H ∞ loop-shaping controller gives the best performance as it is relatively robust to disturbances and has a fast convergence rate. However, P t does not increase the closed-loop bifurcation point significantly and is also sensitive to disturbances. Thus the study concludes that the best option for single-input-single-output (SISO) systems is to control P b with a H ∞ loop-shaping controller. It is suggested that for cases where only topside transmitters are available a cascaded combination of the outlet mass flow and P t could be considered to improve the performance.

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“…In this context, numerical simulations have emerged as a tool of choice [2,3] to understand the formation of intermittent flow patterns and to predict the appearance of a slug flow regime. At the industrial level, the first simulations [4,5,6] were done in the mid 80's.…”

Section: Introductionmentioning

confidence: 99%

Comparison of multiphase SPH and LBM approaches for the simulation of intermittent flows

et al. 2019

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Smoothed Particle Hydrodynamics (SPH) and Lattice Boltzmann Method (LBM) are increasingly popular and attractive methods that propose efficient multiphase formulations, each one with its own strengths and weaknesses. In this context, when it comes to study a given multi-fluid problem, it is helpful to rely on a quantitative comparison to decide which approach should be used and in which context. In particular, the simulation of intermittent two-phase flows in pipes such as slug flows is a complex problem involving moving and intersecting interfaces for which both SPH and LBM could be considered. It is a problem of interest in petroleum applications since the formation of slug flows that can occur in submarine pipelines connecting the wells to the production facility can cause undesired behaviors with hazardous consequences. In this work, we compare SPH and LBM multiphase formulations where surface tension effects are modeled respectively using the continuum surface force and the color gradient approaches on a collection of standard test cases, and on the simulation of intermittent flows in 2D. This paper aims to highlight the contributions and limitations of SPH and LBM when applied to these problems. First, we compare our implementations on static bubble problems with different density and viscosity ratios. Then, we focus on gravity driven simulations of slug flows in pipes for several Reynolds numbers. Finally, we conclude with simulations of slug flows with inlet/outlet boundary conditions. According to the results presented in this study, we confirm that the SPH approach is more robust and versatile whereas the LBM formulation is more accurate and faster.

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Challenges in slug modeling and control for offshore oil and gas productions: A review study

Cited by 70 publications

References 26 publications

Modelling and analysis of impact forces acting on elbow in gas–liquid slug flow

Modelling and analysis of impact forces acting on elbow in gas–liquid slug flow

Comparison of Model-Based Control Solutions for Severe Riser-Induced Slugs

Comparison of multiphase SPH and LBM approaches for the simulation of intermittent flows

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