Study on the Numerical Analysis of In-Line Type Subsea Separator for Liquid-Liquid Mixture Flow

2018 ◽  
Author(s):  
Youngju Kim ◽  
Namsub Woo ◽  
Hyunji Kim ◽  
Sangmok Han ◽  
Jiho Ha ◽  
...  
Keyword(s):  
Oil And Gas ◽  
Separation Efficiency ◽  
Flow Characteristics ◽  
Separation System ◽  
Successful Operation ◽  
Mixture Flow ◽  
Hydrocarbon Production ◽  
Wide Range ◽  
Offshore Oil And Gas ◽  
Line Type

Subsea separation is an attractive and economic solution to develop deep offshore oil and gas fields producing fluid without hydrate or wax. The subsea separation system should be reliable to ensure successful operation in a wide range of multiphase flow regime. A subsea separator can avoid or simplifying costly surface platforms of floating vessels, as well as being an efficient tool to enhance hydrocarbon production. One solution of interest is the separation and re-injection of water at the seabed to avoid bringing the water up to the surface facility. In this study, liquid-liquid flow characteristics inside in-line type subsea separation system are investigated for the design of subsea separation system. The separation efficiency of the subsea separator is determined through experiments that are the liquid-liquid phased separation. Also internal swirl element (ISE) modeling of the separator was optimized. The analysis results were utilized to improve the reliability and efficiency of the subsea separation system.

scholarly journals A Numerical Study on the Optimal design of In-line Type Subsea Separator

2020 ◽  
Vol 13 (2) ◽  
Author(s):  
Hyunji Kim ◽  
Youngju Kim ◽  
Namsub Woo ◽  
Sangmok Han ◽  
Sunchul Huh
Keyword(s):  
Multiphase Flow ◽  
Separation Efficiency ◽  
Numerical Study ◽  
Flow Characteristics ◽  
Separation System ◽  
Successful Operation ◽  
Efficient Tool ◽  
Hydrocarbon Production ◽  
Wide Range ◽  
Line Type

Subsea separation is an attractive and economic solution to develop deep offshore fields producing fluid without hydrate or wax. The subsea separation system should be reliable to ensure successful operation in a wide range of multiphase flow regime, without need for developments. A subsea separator can avoid or simplifying costly surface platforms of floating vessels, as well as being an efficient tool to enhance hydrocarbon production. One solution of interest is the separation and re-injection of water at the seabed to avoid bringing the water up to the surface facility. In this study, multiphase flow characteristics inside in-line type subsea separation system are investigated for the design of subsea separation system. The separation efficiency of the subsea separator is determined through experiments that are the liquid-gas phased separation. Also internal swirl element (ISE) modelling of the separator was optimized. The analysis results were utilized to improve the reliability and efficiency of the subsea separation system.

A Study on the Multiphase Flow Characteristics Inside Subsea Separation System

2014 ◽  
Author(s):  
Nam-Sub Woo ◽  
Young-Ju Kim ◽  
Sang-Mok Han ◽  
Jae-Ki Kwon ◽  
Sang-Shik Kim ◽  
...  
Keyword(s):  
Multiphase Flow ◽  
Deep Water ◽  
Flow Characteristics ◽  
Phase Flow ◽  
Separation System ◽  
Successful Operation ◽  
Efficient Tool ◽  
Hydrocarbon Production ◽  
Development Scheme ◽  
Wide Range

The implementation of subsea separation and liquid boosting is becoming a common development scheme for the exploration of deep water fields. Subsea separation system should be reliable to ensure successful operation in a wide range of 3-phase flow regime, without need for developments. A subsea separator can avoid or simplying costly surface platforms of floating vessels, as well as being an efficient tool to enhance hydrocarbon production. One solution of interest is the separation and re-injection of water at the seabed to avoid bringing the water up to the surface facility. In this study, multiphase flow characteristics inside subsea separation system are investigated for the design of subsea separation system.

scholarly journals Effect of Gain in Soil Friction on the Walking Rate of Subsea Pipelines

2019 ◽  
Vol 7 (11) ◽  
pp. 401 ◽  
Author(s):  
Zhaohui Hong ◽  
Dengfeng Fu ◽  
Wenbin Liu ◽  
Zefeng Zhou ◽  
Yue Yan ◽  
...  
Keyword(s):  
Oil And Gas ◽  
Oil And Gas Industry ◽  
Pipeline System ◽  
Gas Industry ◽  
Steel Catenary Riser ◽  
Wide Range ◽  
Offshore Oil And Gas ◽  
Subsea Pipelines ◽  
Offshore Oil ◽  
Pipeline Design

Subsea pipelines are commonly employed in the offshore oil and gas industry to transport high-pressure and high-temperature (HPHT) hydrocarbons. The phenomenon of pipeline walking is a topic that has drawn a great deal of attention, and is related to the on-bottom stability of the pipeline, such as directional accumulation with respect to axial movement, which can threaten the security of the entire pipeline system. An accurate assessment of pipeline walking is therefore necessary for offshore pipeline design. This paper reports a comprehensive suite of numerical analyses investigating the performance of pipeline walking, with a focus on the effect of increasing axial soil resistance on walking rates. Three walking-driven modes (steel catenary riser (SCR) tension, downslope, and thermal transient) are considered, covering a wide range of influential parameters. The variation in walking rate with respect to the effect of increased soil friction is well reflected in the development of the effective axial force (EAF) profile. A method based on the previous analytical solution is proposed for predicting the accumulated walking rates throughout the entire service life, where the concept of equivalent soil friction is adopted.

scholarly journals Media corrosiveness and materials resistance at presence of aggressive carbon dioxide

2021 ◽  
Vol 64 (11) ◽  
pp. 793-801
Author(s):  
R. R. Kantyukov ◽  
D. N. Zapevalov ◽  
R. K. Vagapov
Keyword(s):  
Carbon Dioxide ◽  
Oil And Gas ◽  
Gas Production ◽  
Carbon Dioxide Corrosion ◽  
Gas Field ◽  
Hydrocarbon Production ◽  
Field Development ◽  
Wide Range ◽  
Corrosive Effect ◽  
Equipment And Pipelines

At the present stage of gas field development, the products of many mining facilities have increased content of corrosive CO2 . The corrosive effect of CO2 on steel equipment and pipelines is determined by the conditions of its use. CO2 has a potentially wide range of usage at oil and gas facilities for solving technological problems (during production, transportation, storage, etc.). Simulation tests and analysis were carried out to assess the corrosion effect of CO2 on typical steels (carbon, low-alloy and alloyed) used at field facilities. Gas production facilities demonstrate several corrosion formation zones: lower part of the pipe (when moisture accumulates) and top of the pipe (in case of moisture condensation). The authors have analyzed the main factors influencing the intensity of carbon dioxide corrosion processes at hydrocarbon production with CO2 , its storage and use for various technological purposes. The main mechanism for development of carbon dioxide corrosion is presence/condensation of moisture, which triggers the corrosion process, including the formation of local defects (pits, etc.). X-ray diffraction was used for the analysis of corrosion products formed on the steel surface, which can have different protective characteristics depending on the phase state (amorphous or crystalline).

scholarly journals Contesting Political Decisions Involving Environmental Issues: A Case Study in Portugal Based on the Press About Offshore Oil and Gas Drilling

2021 ◽  
Vol 8 ◽  
Author(s):  
Bruno Pinto ◽  
Paula Castro
Keyword(s):  
Oil And Gas ◽  
Oil Companies ◽  
Gas Drilling ◽  
Wide Range ◽  
The Press ◽  
The Government ◽  
Offshore Oil And Gas ◽  
Offshore Oil ◽  
Political Decisions

This paper presents a case study about the drilling of offshore oil and gas in mainland Portugal, a process that ended with the cancelation of all contracts. It aimed to better understand the argumentative and value dynamics involved in how municipalities, populations, civic organizations, and others successfully contested the central government decision of prospection. Since the press was one of the main stages for this conflict, it was important to analyze how it presented the respective arguments to society. Articles on this topic were collected from the two widely read national newspapers “Correio da Manhã” and “Público” in the culmination period of this confrontation, which occurred between June 2016 and December 2018. In total, 155 articles were found, 61.3% (n = 95) from “Público” and 38.7% (n = 60) from “Correio da Manhã.” The quantitative analysis focused on the number of news per month and the frequency of themes, as well as the frequency of actors and arguments used against and in favor of exploitation on the news. Thematic analysis was used to qualitatively assess the articulation of arguments in the two opposing views. Results show that, in both newspapers, the majority of articles focused on the positions and actions of those opposing prospection, as the Government and other actors in favor of drilling were much less active in presenting its arguments. Overall, the analysis suggests two different strategies: (a) a strong argumentative synergy between a wide range of actors against offshore prospection. Their concerted arguments defended multiple values, including public participation in political decisions, protecting local communities and places from environmental risks, countering climate change, and protecting local economic activities. (b) The Government was usually isolated in its arguments with the occasional exception of oil companies or representatives of the national industry. The scarce arguments used by these actors evoked mostly national economic values, with little engagement with other societal goals. This study suggests that the large mobilization of different sectors of society, their use of a convergent and wide range of arguments, and the lack of engagement of the Government in a dialogical argumentation were crucial to delegitimize the latter’s political decision.

Designing, Making, and Testing Syntactic Foam of Precisely Controlled Hydrostatic Strength

2003 ◽  
Author(s):  
Wen-Tsuen Wang ◽  
Lou Watkins
Keyword(s):  
Oil And Gas ◽  
Syntactic Foam ◽  
Confined Space ◽  
Foam Material ◽  
Gas Wells ◽  
Wide Range ◽  
Oil And Gas Wells ◽  
Temperature And Pressure ◽  
Offshore Oil And Gas ◽  
Offshore Oil

This paper describes a recently developed syntactic foam material designed to collapse under precisely defined conditions of temperature and pressure to protect ultra-deep high pressure offshore oil and gas wells. Each grade of syntactic foam is engineered to have a specific set of characteristics, tailored for the region of the well it occupies. In the startup phase, the materials remain intact, with no significant volume change. As pressure and temperature in the well rise during operations, the materials begin to compress and relieve pressure in the narrow, confined space of the annulus. Finally, when conditions reach preset limits, the syntactic foam undergoes a sudden and dramatic collapse, preventing excessive overpressure, and protecting the steel casing. An important advantage of this material is that it is passive, requiring no controls or active intervention. It responds automatically to protect the well casing from overpressures and temperature spikes. The properties of the material can be adjusted to suit a wide range of conditions inside a given well, or from one well to another.

scholarly journals Decommissioning impacts on biotic assemblages associated with shell mounds beneath southern California offshore oil and gas platforms

2019 ◽  
Vol 95 (4) ◽  
pp. 683-702 ◽  
Author(s):  
Erin L Meyer-Gutbrod ◽  
Milton S Love ◽  
Jeremy T Claisse ◽  
Henry M Page ◽  
Donna M Schroeder ◽  
...  
Keyword(s):  
Species Composition ◽  
Southern California ◽  
Oil And Gas ◽  
Fish Assemblages ◽  
Ecological Value ◽  
Remotely Operated Vehicle ◽  
Wide Range ◽  
Shell Mounds ◽  
Offshore Oil And Gas ◽  
Offshore Oil

The decommissioning of southern California offshore oil and gas platforms will create major economic, engineering, and environmental challenges in the next decade. Platform jackets, conductors, and shell mounds often host a diverse and productive marine community, and among the myriad considerations associated with decommissioning planning, platform operators and federal and state regulatory agencies will consider the ecological value of existing underwater structures as artificial reefs. In the event of partial removal of platform structure, fish assemblages on decommissioned platforms may remain unchanged in areas where structure is left intact. However, on the seafloor beneath the platforms, a mound of debris often called the shell mound will likely change over time if the supply of falling mussels and other organisms from the productive surface part of the structure is removed. In this study, we review shell mound research relevant to decommissioning, including mound formation, contaminant loads, associated biological communities, and transitions following the removal of platform structures at four sites. To address the gap in knowledge of shell mound fish community structure, we used manned submersible and remotely operated vehicle surveys from 1997 to 2013 to estimate the biomass, density, species composition and similarity between shell mounds at 22 southern California platforms. We found a wide range of variability in fish density and shell mound areal extent. Species composition also varied among sites, with three significant community clusters primarily distinguished by species depth preferences. These results will help inform a comprehensive net environmental benefit analysis of southern California offshore platform decommissioning alternatives.

scholarly journals Analysis of the application and impact of carbon dioxide media on the corrosion state of oil and gas facilities

2021 ◽  
Vol 250 ◽  
pp. 578-856
Author(s):  
Rafael Kantyukov ◽  
Dmitry Zapevalov ◽  
Ruslan Vagapov
Keyword(s):  
Carbon Dioxide ◽  
Oil And Gas ◽  
Carbonic Acid ◽  
Acid Corrosion ◽  
Co2 Storage ◽  
Hydrocarbon Production ◽  
Partial Pressures ◽  
Wide Range ◽  
Corrosion Of Steel ◽  
Corrosion State

Products of several currently operated production facilities (Bovanenkovskoye, Urengoyskoye oil and gas condensate fields, etc.) contain an increased amount of corrosive CO2. Effect of CO2 on the corrosion of steel infrastructure facilities is determined by the conditions of its use. Carbon dioxide has a potentially wide range of applications at oil and gas facilities for solving technological problems (during production, transportation, storage, etc.). Each of the aggregate states of CO2 (gas, liquid and supercritical) is used and affects the corrosion state of oil and gas facilities. Article analyzes the results of simulation tests and evaluates the corrosion effect of CO2 on typical steels (carbon, low-alloy and alloyed) used at field facilities. The main factors influencing the intensity of carbonic acid corrosion processes in the main conditions of hydrocarbon production with CO2, storage and its use for various technological purposes are revealed. Development of carbon dioxide corrosion is accompanied and characterized by the localization of corrosion and the formation of defects (pitting, pits, etc.). Even alloyed steels are not always resistant in the presence of moisture and increased partial pressures of CO2, especially in the presence of additional factors of corrosive influence (temperature, aggressive impurities in gas, etc.).

Numerical Simulation of Fluid Flow in Deterministic Lateral Displacement Devices

2013 ◽  
Author(s):  
Haidong Feng ◽  
Sanja Miskovic
Keyword(s):  
Fluid Flow ◽  
Tilt Angle ◽  
Separation Efficiency ◽  
Lateral Displacement ◽  
Flow Characteristics ◽  
Critical Diameter ◽  
Particle Separation ◽  
Deterministic Lateral Displacement ◽  
Pillar Diameter ◽  
Wide Range

Deterministic lateral displacement (DLD) is a continuous, flow-based micro-particle separation method. DLD takes advantage of the laminar nature of the fluid flow in microchannels by directing the small particles along the main streamline of the fluid flow, while laterally displacing larger particles along the axis of the micropillar array. When optimally designed, this simple and energy-efficient method allows a high-resolution separation of particle mixtures carried along by the liquid at high velocity. In this paper, a numerical modeling of fluid flow inside of different DLD devices at different Re numbers is performed. A parametric study is conducted to assess the variation of theoretical critical particle size for various DLD devices. Parameters that affect flow velocity distribution, such as shift fraction and tilt angle are studied. Simulation results show that both micropillar shift fraction and the tilt angle significantly affect the velocity profile within the DLD device. A model is presented to describe the critical diameter for a wide range of pillar-diameter-to-gap-size ratios. The possibility of achieving greater throughput, while preserving flow characteristics and therefore particle separation efficiency, is demonstrated.

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