Influence of riser-induced slugs on the downstream separation processes

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

doi:10.1016/j.petrol.2017.04.042

Cited by 11 publications

(18 citation statements)

References 16 publications

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“…An overview of the main process parts is shown in Figure 4 . The system has, in the past, been used for several investigations to test/develop new control algorithms for process systems, modeling, slugging, fault detection/diagnosis, instrumentation performance, and HMI design [ 13 , 43 , 44 , 45 , 46 , 47 ].…”

Section: Methodsmentioning

confidence: 99%

Uncertainty Analysis of Fluorescence-Based Oil-In-Water Monitors for Oil and Gas Produced Water

Hansen

Jespersen

Bram

et al. 2020

Sensors

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Offshore oil and gas facilities are currently measuring the oil-in-water (OiW) concentration in the produced water manually before discharging it into the ocean, which in most cases fulfills the government regulations. However, as stricter regulations and environmental concerns are increasing over time, the importance of measuring OiW in real-time intensifies. The significant amount of uncertainties associated with manual samplings, that is currently not taken into consideration, could potentially affect the acceptance of OiW monitors and lower the reputation of all online OiW measurement techniques. This work presents the performance of four fluorescence-based monitors on an in-house testing facility. Previous studies of a fluorescence-based monitor have raised concerns about the measurement of OiW concentration being flow-dependent. The proposed results show that the measurements from the fluorescence-based monitors are not or insignificantly flow-dependent. However, other parameters, such as gas bubbles and droplet sizes, do affect the measurement. Testing the monitors’ calibration method revealed that the weighted least square is preferred to achieve high reproducibility. Due to the high sensitivity to different compositions of atomic structures, other than aromatic hydrocarbons, the fluorescence-based monitor might not be feasible for measuring OiW concentrations in dynamic separation facilities with consistent changes. Nevertheless, they are still of interest for measuring the separation efficiency of a deoiling hydrocyclone to enhance its deoiling performance, as the separation efficiency is not dependent on OiW trueness but rather the OiW concentration before and after the hydrocyclone.

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Section: Methodsmentioning

confidence: 99%

Uncertainty Analysis of Fluorescence-Based Oil-In-Water Monitors for Oil and Gas Produced Water

Hansen

Jespersen

Bram

et al. 2020

Sensors

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“…The PTs have operational ranges of 0–16 bar (0–1.6 MPa) and a piezo‐resistive measuring cell with a ceramic diaphragm. The pressure transmitter is noted for its fast step response time of fewer than 5 ms. [ 19 ]…”

Section: Experimental Facilitymentioning

confidence: 99%

“…The test conditions were designed based on similar tests conducted by other researchers in past studies. [ 19,20 ] Slugs were created with constant liquid and gas flow rates of 0.4 and 0.000 484 kg/s, respectively. These values correspond to past data reported in previous studies.…”

Section: Experimental Facilitymentioning

confidence: 99%

Suppression of liquid slugs and phase separation through pipeline bends

Igbokwe

Naterer

Pedersen³

et al. 2021

Can J Chem Eng

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This study examines the suppression of liquid slugs in the transport and separation of multiphase flows in pipelines. Two well-known slug control approaches are evaluated in this paper. The methods are employed to control and stabilize an undesired and unstable flow regime, optimize flow production, reduce operating costs, and in general, improve overall safety requirements of oil and gas pipelines. Unlike designs with an additional flowline to separate gas upstream, this study shows that active topside choking can suppress slugs and stabilize the system flowrates and pressures without the requirement of separation upstream of the topside valve. Careful choking is required to minimize production losses that can result from excess back pressure. A riser-based, gas-lift method reduces system instability and increases production. This study also reveals that negligible improvement in stability is achieved when large volumes of gas are injected. The system shifts into an annular flow regime when the injection is further increased. A large separator may be required to accommodate high gas volumes. This study shows that gas-lift not coordinated with choking is not effective for slug mitigation through pipeline bends. This paper also presents and discusses new non-dimensional correlations, including slug control inputs in the pipelines such as choke openings, based on new experimental data.

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“…Thus, when the interface configuration is established, the implementation is simplified substantially, which ultimately benefits both the operator and developer when working on signal processing, instrumentation, and/or control development. This type of interface configuration is not typically used in civil engineering applications; however, it has been demonstrated in other applications, such as oil and gas multi‐phase processes, 28,29 membrane filtration units, 30 pump flow loops, 31 and tomography transmitter systems 32 . Zhang et al 10 .…”

Section: Introductionmentioning

confidence: 99%

Closed‐loop experimental testing framework for structural control applications

Pedersen

Ulriksen

2021

Struct Control Health Monit

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Within civil engineering, the inclusion of control strategies is confined to limited application areas due to the practical overhead and an alleged conservatism. This paper presents a simple yet flexible framework for experimental testing of closed‐loop structural systems. Compared to alternative existing solutions, the proposed framework requires limited programming knowledge, which heavily simplifies the implementation for the operator and thus reduces the associated practical overhead. The feasibility of the framework is demonstrated through two experimental case studies in which control strategies are used to, respectively, design and implement a hybrid tuned mass damper (TMD) and conduct closed‐loop model updating. The case studies exemplify the diversity of control applications within civil engineering, and it is noted that while hybrid TMDs are used in the civil engineering industry, limited experimental application studies exist on closed‐loop model updating of structural systems. It is concluded that the presented framework can be applied to cover a variety of structural control applications within civil engineering and the successful implementation of the framework in the two case studies highlights the benefits of feedback control within these applications.

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Influence of riser-induced slugs on the downstream separation processes

Cited by 11 publications

References 16 publications

Uncertainty Analysis of Fluorescence-Based Oil-In-Water Monitors for Oil and Gas Produced Water

Uncertainty Analysis of Fluorescence-Based Oil-In-Water Monitors for Oil and Gas Produced Water

Suppression of liquid slugs and phase separation through pipeline bends

Closed‐loop experimental testing framework for structural control applications

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