Design and Operability Considerations of the Gas Flowline at Parque das Conchas (BC-10) Ostra Field

Atakan, Ziya; Chin, Y. Doreen; Lang, P.; Iyer, Sada

doi:10.4043/20528-ms

Cited by 4 publications

(6 citation statements)

References 1 publication

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“…Rapid gas decompression and its impact on the equipment has been discussed previously [ Ref 1,3]. As part of anticipated start up scenarios, rapid pressure reduction in the Ostra caisson was anticipated.…”

Section: Rapid Gas Decompression Learningmentioning

confidence: 94%

Section: Impacts On Gas Line Operabilitymentioning

confidence: 99%

“…The primary factors affecting the stability, deliverability and performance of Ostra gas flowline operation include the caisson pressure, the topsides separator pressure, and the LCO from the caissons [3]. The separated caissons were originally designed to operate at 900 psia during initial production [3]. In general, a higher caisson pressure provides a broader operational window for the gas flowline, but it imposes additional back-pressure on the Ostra wells thereby reducing production from the wells.…”

Section: Impacts On Gas Line Operabilitymentioning

confidence: 99%

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Field Validation and Learning of the Parque das Conchas (BC-10) Subsea Processing System and Flow Assurance Design

et al. 2011

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Parque das Conchas (BC-10) is a deepwater development offshore Brazil. A novel Caisson / Electrical Submersible Pump (ESP) subsea separator (gas/liquid) and pumping system to enhance production and maximize recovery has been utilized as part of the development of two of the fields (Ostra and Abalone). A third field, Argonauta B-West utilizes multiphase boosting with a modified Caisson/ESP (C-ESP) system to operate with a single, non-separated multiphase outlet. These novel designs have significantly impacted system and flow assurance engineering such as separator level control, hydrate mitigation, system operability, and chemical injection. The fields have been successfully started up with production through the subsea processing system since late 2009. This paper outlines the performance of the subsea processing and production system from the perspective of flow assurance, and presents comparisons of the actual operating performance to design expectations. Learnings from key factors that strongly impact the production system operability and operational strategies are discussed, including the achieved separation efficiency of the caisson, the impact of defoamer performance on caisson operation and the importance of the hot oil circulation system.

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Section: Rapid Gas Decompression Learningmentioning

confidence: 94%

Section: Impacts On Gas Line Operabilitymentioning

confidence: 99%

Section: Impacts On Gas Line Operabilitymentioning

confidence: 99%

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Field Validation and Learning of the Parque das Conchas (BC-10) Subsea Processing System and Flow Assurance Design

et al. 2011

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“…However, the use of ECT for this application has limitation because during liquid carryover, the droplet may not establish good contact with the electrode and this will affect the electrostatic field in the separator which may result to poor image resolution considering that ECT is non-intrusive device. Seriesrco density profiler are said to be very good for separator diagnostics [2], [3] but the authors are yet to stumble on literature showing the application of density profiler for liquid holdup measurement in cyclonic separator. Considering that liquid carryover phenomenon is very dynamic, one could rather rely on average holdup up to estimate mixture density rather using radioactive seriesrs; moreover, radioactive substance poses a health risk.…”

Section: Figure 1 Schematic View Of a Gas-liquid Pipe Cyclonic Separatormentioning

confidence: 99%

“…Liquid holdup measurement is generally important for calculation of pressure drop, separator operating envelope and the steady state liquid content in the gas flowline [15]. Liquid build-up in gas flowline as a result to liquid carryover in Caisson subsea separator was identified by Atakan et al, [2] as critical parameter that reduced the hydraulic efficiency of gas flowline. Previous research effort at Tulsa by Chirinos et al, [16] to measure and estimate the percentage liquid carryover was to install a 6 inch liquid trap pipe in the outlet of the GLCC separator so as to trap the liquid leaving the separator in form of carryover.…”

Section: Area Average Liquid Holdupmentioning

confidence: 99%

Study of phase distribution in pipe cyclonic compact separator using wire mesh sensor

Kanshio

Yeung

Lao

2017

Flow Measurement and Instrumentation

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Separation of gas-liquid mixture, which is achieved by using either large gravity separators or compact separators is a common and vital operation in the petroleum industry. Where space and cost are key project considerations, gas-liquid compact separators are very attractive because of their versatility and cost effectiveness. Efficiencient performance of the cyclonic separator depends on smooth and steady swirling flow. Unsteady swirling flow in the separator may be due to capacity constraint, improper design or unforeseen flow instability at the inlet. An understanding of phase distribution in gas discharge section of these separators would help design engineers make a better decision when selecting and sizing inlet nozzle, diameter and length of the separator. In this paper, the structure of phase distribution and liquid holdup in the gas discharge section of the separator was obtained using a 24x24 resolution wire mesh sensor (WMS). The acquired area average liquid holdup and the images were analysed using time series and 2D slice to discriminate between partial separation and critical separation condition.The liquid holdup as a function of separator inlet superficial velocity was quantified.

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An Analysis of Inlet Inclination on the Performance of a Gas-Liquid Cylindrical Cyclonic Separator

Kanshio¹

2019

OGCE

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Gas-Liquid cylindrical cyclonic separator plays a significant role with regards to gas-liquid separation in the oil fields. Its major operational challenges include liquid carryover and excessive pressure losses. The Inlet geometry of a gasliquid cylindrical cyclone is one of its critical parts that affect the performance of the separator. The inlet geometry drives the performance of the separator in terms of liquid carryover and pressure drop. Traditionally, the 27° downward inclined inlet is usually used because of its advantage in terms of liquid carryover operating envelope. However, detail comparison in terms of pressure drop in the gas leg of the separator is yet to be reported. In this paper, the author presents experimental results on the effect of inlet inclination on the performance of a gas-liquid cyclonic separator in terms of separation efficiency (liquid carryover) and pressure drop. The results showed that under the same inlet conditions, the liquid carryover operating envelope of the 27° downward inclined inlet pipe cyclonic gas-liquid separator is slightly wider than the horizontal inlet of the same separator. However, the pressure drop across the gas leg of the 27° downward inclined inlet pipe cyclonic gas-liquid separator is far greater than the horizontal inlet of the same separator. The paper concludes that, where there is a strict requirement on pressure drop, the horizontal inlet cyclonic separator should be favoured against the 27° inclined inlet.

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Design and Operability Considerations of the Gas Flowline at Parque das Conchas (BC-10) Ostra Field

Cited by 4 publications

References 1 publication

Field Validation and Learning of the Parque das Conchas (BC-10) Subsea Processing System and Flow Assurance Design

Field Validation and Learning of the Parque das Conchas (BC-10) Subsea Processing System and Flow Assurance Design

Study of phase distribution in pipe cyclonic compact separator using wire mesh sensor

An Analysis of Inlet Inclination on the Performance of a Gas-Liquid Cylindrical Cyclonic Separator

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