scholarly journals Experimental Study on Vortex-Induced Vibration of Risers Considering the Effects of Different Design Parameters

2018 ◽  
Vol 8 (12) ◽  
pp. 2411 ◽  
Author(s):  
Chunguang Wang ◽  
Yangyang Cui ◽  
Shiquan Ge ◽  
Mingyu Sun ◽  
Zhirong Jia
Keyword(s):  
Oil And Gas ◽  
Design Parameters ◽  
Relative Significance ◽  
Vortex Induced Vibration ◽  
Multiple Parameters ◽  
Relational Analysis ◽  
Grey Relational Grade ◽  
Offshore Oil And Gas ◽  
Grey Relational ◽  
Offshore Oil

Risers are an indispensable component of offshore oil and gas exploitation structures, and they are vulnerable to vortex-induced vibration (VIV). Although many studies have been conducted to investigate the VIV characteristics of risers, the effects of combination of multiple parameters and the relative significance of each parameter on the risers’ VIV characteristics have rarely been considered. In this paper, 36 experimental cases were investigated to study the risers’ VIV characteristics due to the combination of multiple parameters. The natural frequencies, response microstrains and frequencies of VIV for the risers were obtained. Meanwhile, the effect of each parameter and the relative significance of these parameters on the amplitude of VIV in risers were calculated using grey relational analysis (GRA). The results show that all the parameters considered—i.e., material property (modulus and density), end condition, top tension force and flow velocity—affect risers’ VIV response, and the grey relational grade of these parameters are: r 02 ( velocity ) > r 04 ( constraints ) > r 05 ( density ) > r 03 ( tension ) > r 01 ( modulus ) .

Design optimization of micromixer with circular mixing chambers (M-CMC) using Taguchi-based grey relational analysis

2020 ◽  
Vol 18 (9) ◽  
Author(s):  
Ranjitsinha R. Gidde
Keyword(s):  
Grey Relational Analysis ◽  
Design Parameters ◽  
Relational Analysis ◽  
Mixing Dynamics ◽  
Depth Study ◽  
Grey Relational Grade ◽  
Grey Relational ◽  
Mixing Chambers ◽  
Optimal Set ◽  
Level Analysis

AbstractThe aim of the present study is to optimize the micromixer with circular mixing chambers (M-CMC) using Taguchi-based grey relational analysis approach. Simulations are performed to investigate the effect of design parameters viz. chamber diameter, transverse offset and width of constriction channel on performance characteristics for parameter sets corresponding to Orthogonal Array (OA) L9. Further, grey relational grade is used to identify the optimal set of design parameters. In depth study of flow and mixing dynamics are carried out to visualize the mixing mechanism for optimal and other two cases of proposed micromixer design configuration for Re in the range from 0.1 to 50. In order to assess the response of each design variable at each level, analysis of variance (ANOVA) is also performed to analyse influence of design parameters on mixing index and pressure drop.

scholarly journals Comparative Study of Vortex-Induced Vibration of FRP Composite Risers with Large Length to Diameter Ratio Under Different Environmental Situations

2019 ◽  
Vol 9 (3) ◽  
pp. 517 ◽  
Author(s):  
Chunguang Wang ◽  
Shiquan Ge ◽  
Mingyu Sun ◽  
Zhirong Jia ◽  
Baomin Han
Keyword(s):  
Comparative Study ◽  
Oil And Gas ◽  
Cfd Simulation ◽  
Stress Distributions ◽  
Vortex Induced Vibration ◽  
Frp Composite ◽  
Composite Layers ◽  
Large Length ◽  
Offshore Oil And Gas ◽  
Offshore Oil

The increasing attraction of crude resources on the ocean floor leads to the development of risers, which are an indispensable component of an offshore oil and gas exploitation structure. High-grade steel is normally utilized for risers, however, fiber reinforced polymer (FRP) composite risers have become a feasible and economical alternative due to the desirable properties of the material. A comparative study of vortex-induced vibration (VIV) of FRP composite risers with two designed geometries were conducted and an X80 steel riser was used as the benchmark. The length to diameter ratios of all three risers were set to 100 and their VIV responses under different environmental situations, including the natural frequencies, global displacements, global stresses and the stress distributions in every composite layers, were obtained using computational fluid dynamics (CFD) simulation with coupled fluid–structure interaction. The VIV characteristics of both FRP composite risers and their distinction compared with that of steel risers were analyzed and discussed. From this paper, the dynamic characteristics in different environmental situations of VIV for FRP composite risers can be further understood.

scholarly journals Effects of Different Design Parameters on the Vortex Induced Vibration of FRP Composite Risers Using Grey Relational Analysis

2019 ◽  
Vol 7 (7) ◽  
pp. 231 ◽  
Author(s):  
Chunguang Wang ◽  
Shiquan Ge ◽  
Justin W. Jaworski ◽  
Liping Liu ◽  
Zhirong Jia
Keyword(s):  
Grey Relational Analysis ◽  
Flow Direction ◽  
Cross Flow ◽  
Tension Force ◽  
Design Parameters ◽  
Attractive Alternative ◽  
Vortex Induced Vibration ◽  
Relational Analysis ◽  
Frp Composite ◽  
Grey Relational

Risers are indispensable components of offshore platform systems that connect the wellhead at the sea bottom and to the platform at the sea surface and are normally made of high grade steel. Nowadays, fiber reinforced polymer (FRP) composite has been recognized as an attractive alternative riser material. Similarly to steel risers, FRP composite risers are also vulnerable to vortex induced vibration (VIV), and the effects of the composite makeup of these risers on VIV are the subject of the present investigation. Three risers (the tailored design composite riser, the composite riser with orthogonal reinforcements and the steel riser), three current velocities (0.36 m/s, 1.22 m/s and 2.13 m/s) and three water depths (12.5 m, 25 m and 37.5 m) are considered. In total, 9 study cases using orthogonal array (OA) sampling are investigated to study the risers’ VIV characteristics. The computational fluid dynamics (CFD) simulations with coupled fluid–structure interaction (FSI) are used to obtain the risers’ natural frequencies, global displacements, global stresses and the stress distributions in each composite lamina. The effect of 5 parameters (Etension, Ebending, L/Douter, tension force and current velocity) on the VIV amplitude in a cross flow direction of the risers is analyzed using Grey relational analysis (GRA) and the Grey relational grade of these parameters are: r 05 ( Velocity ) > r 03 ( L / D outer ) > r 04 ( Tension   Force ) > r 01 ( E t e n s i o n ) > r 02 ( E b e n d i n g ) .

scholarly journals Design and operation peculiarities of platform support vessels (PSVs)

2021 ◽  
Vol 1 (395) ◽  
pp. 85-98
Author(s):  
G. Demeshko ◽  
◽  
R. Detsik ◽  
Keyword(s):  
Oil And Gas ◽  
Spare Parts ◽  
Gas Production ◽  
Design Parameters ◽  
Oil And Gas Production ◽  
Design Recommendations ◽  
General Arrangement ◽  
Offshore Oil And Gas ◽  
Drilling Rigs ◽  
Offshore Oil

Object and purpose of research. This papers discusses PSVs (or, in RS classification, Supply Vessels): special ships that provide offshore drilling rigs with drilling supplies, fuel, water, provisions, spare parts for equipment, as well as deliver personnel shifts to/from the platform and perform the functions of duty, rescue, fire, and environmental protection vessels. The purpose of the study is to develop a physical model of PSV functioning and give design recommendations for proper de-termination of its characteristics and properties. Materials and methods. Generalization and analysis of PSV design and operation, as well as analysis of Russian and foreign publications about PSV specifics, supported by systematized statistical materials sufficient for design recommendations. Main results. This work summarized the data on PSV properties, characteristics, design and operation requirements, as well as the ways to implement them in terms of hull shape, general arrangement, mission-specific equipment, conceptual type and power plant, suggesting a vision of PSV as design object. Regressive analysis performed by the authors is supported by a wide scope of design materials that summarizes PSV operation experience and development trends, thus preparing the basis for future PSV designs. Conclusion. PSVs are the main link in the offshore oil and gas production. The ships of this type are becoming more and more popular, especially in their multi-purpose variant. This paper makes it possible to formulate design requirements for them, as well as to trace the ways of their implementation. This paper also suggests the methods for determination of PSV dimensions, conceptual type and mission-specific equipment, as well as main design parameters, properties and transportation and operation capabilities.

Drilling and Service Contracts in Offshore Oil and Gas Operations

1973 ◽  
Vol 11 (3) ◽  
pp. 480
Author(s):  
J. M. Killey
Keyword(s):  
Oil And Gas ◽  
Oil Industry ◽  
Offshore Drilling ◽  
Oil Companies ◽  
Drilling Rig ◽  
Service Contracts ◽  
Oil And Gas Operations ◽  
Offshore Oil And Gas ◽  
Offshore Oil ◽  
Offshore Operations

As onshore oil and gas deposits are becoming more difficult to locate, and as the world demands for energy continue to increase at an alarming rate, oil companies are channeling much of their exploration activities towards offshore operations, and in particular, towards operations centered off Canada's coast lines. Because of the environment, offshore drilling presents problems which are novel to the onshore-geared oil industry. J. M. Killey discusses in detail many of the considerations involved in drafting the offshore drilling contract, concentrating on problems such as the liability of the various parties; costs; scheduling; pollution; conflict of laws; etc. Similarly, he discusses service contracts (such as supply boat charters; towing services; helicopter services; etc.^ which are necessity to the operation of an offshore drilling rig. To complement his paper, the author has included number of appendices which list the various considerations lawyer must keep in mind when drafting contracts for offshore operations.

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