Structural Optimization for the Ice-Resistance Platform in Bohai Bay

2014 ◽  
Author(s):  
Hou Jinlin ◽  
Shao Weidong
Keyword(s):  
Structural Design ◽  
Oil And Gas ◽  
Material Selection ◽  
Gas Production ◽  
Bohai Bay ◽  
Operating Personnel ◽  
Platform Design ◽  
Ice Loads ◽  
Ice Resistance ◽  
Ice Induced Vibration

Bohai Bay is a major offshore oil and gas production area in China, a number of oil and gas fields are located there. The offshore facilities in this area are subject to ice loads in the winter, and the ice loads on the platform are one of the major concerns in the structural design in this area. The loads include ice impact, ice-induced-vibration and floating ice influence to the offshore operations. Compared to the loads combination of wind, wave and current, the ice load may be the governing loading condition in the structural design. The ice induced vibration to the production facilities and the living quarters may also seriously affect safety and the health of the operating personnel. This paper briefly introduces the development history of the ice-resistance platform design in Bohai Bay, and based on previous experience, the ice loads calculation method, the structure configuration of primary steel, the appurtenance arrangement and the conical structure at ice abrasive zones are discussed to optimize the ice-resistance capability. The material selection and different vibration mitigation methods are also discussed in this paper. Although significant progress has been made on the ice-resistance platform design, the problems still remain such as the floating ice accumulation around well slots. Further study on ice-induced vibration is necessary. This paper summarizes the main issues and challenges in the ice-resistance platforms and proposes the key points for future development. This paper also provides helpful references to the design and optimization of the offshore platform in an ice active environment.

Predictive and Preventive Maintenance of Oil and Gas Production Pipelines in the Area North Monagas-Venezuela

1996 ◽  
Author(s):  
Miguel Angel Lugo Pérez
Keyword(s):  
Oil And Gas ◽  
Material Selection ◽  
Gas Production ◽  
Predictive Maintenance ◽  
Destructive Testing ◽  
Preventive Program ◽  
Oil And Gas Production ◽  
Internal Corrosion ◽  
Operational Risks ◽  
Operational Failures

Predictive maintenance of oil and gas production pipelines has allowed tp predict operational failures. Specially due to the thermodynamic behavior of the produced fluids, contaminants present in the oil and gas such as sand, water, H2S and CO2, asphaltene deposition, high temperatures and pressures, phisicochemical characteristics of the soil, etc. that would lead to risks of the installations. In order to minimize risks of failures, we have stablish a control and monitoring preventive program of the variables that influence this conditions, such as: non-destructive testing, wall thickness measurements and two dimensional B Scan measurements to detect impurities, laminations and inclusions in the pipeline material, corrosion evaluation of pipelines, characterization of the soil corrosive potential of flow stations and compressing plants. Aditionally, we have implementede predictive control through the application of external corrosion prevention techniques such as cathodic protection and coatings. For internal corrosion, the use of corrosion inhibitors, asphaltene dispersants and material selection. Increasing the protection through preventive and predictive maintenance we can reduce the operational risks involved for the oil and gas production.

Design Load Measures for Vapor Cloud Explosion on Complex Systems: Review and Recommendations

2017 ◽  
Author(s):  
Maryam Mortazavi ◽  
YeongAe Heo ◽  
Yue Li
Keyword(s):  
Structural Design ◽  
Oil And Gas ◽  
Free Field ◽  
Economic Loss ◽  
Gas Production ◽  
Combustion Mechanism ◽  
Design Standards ◽  
Oil And Gas Production ◽  
Design Load ◽  
Vapor Cloud

A hydrocarbon Vapor Cloud Explosion (VCE) is one of critical hazardous events in offshore installations. Once VCE occurs in the ocean, it results in tremendous economic loss, casualties, and environmental impact. The combustion mechanism of VCE differs from HE in particular in complex geometries (e.g. offshore oil and gas production facilities) as there exist many objects which can trigger severe turbulences. Although many research efforts have been made to develop design provisions for blast resistant structures, most of those provisions are based on high-order explosives (HE) such as TNT (TriNiTrotoluene) in a free field. Therefore, typical blast resistant structural design standards were examined to address the weaknesses of standards in this study. Existing blast wave models which provide key design load parameters were also reviewed to address limitations of each approach. Finally, essential recommendations are discussed in this paper for future studies to improve blast resistant structural design provisions with the ultimate aim of protecting our lives, assets and environment from VCE in the ocean.

A Novel Design of Mobile Offshore Drilling Unit for Arctic Conditions

2011 ◽  
Author(s):  
Alexei Bereznitski
Keyword(s):  
Oil And Gas ◽  
Open Water ◽  
Model Testing ◽  
Offshore Drilling ◽  
Arctic Conditions ◽  
Drilling Unit ◽  
Ice Loads ◽  
High Winds ◽  
Ice Resistance ◽  
Novel Design

Exploration of Arctic offshore for oil and gas sets extremely high requirements for Mobile Offshore Drilling Units (MODU). Arctic offshore is one of the harshest environments on the planet. Low temperatures, high winds and ice infested waters represent great challenge. Drilling units, which are optimized for severe ice loads, are vulnerable to waves when water clears from the ice. MODU’s specifically designed for open water and extreme waves have poor ice resistant performance. A Novel Design of column stabilized Mobile Offshore Drilling Unit named JBF Arctic is presented in the paper. The major feature of the unit is the combination of exceptional seakeeping characteristics and excellent ice resistance. This is achieved by utilization of a dual draft concept. In open water the unit has a draft which is typical for column stabilized units. In ice the unit is submerged to a deeper draft where a cone shaped heavily reinforced upper structure receives the ice loads. This paper deals with results of extensive research including seakeeping calculations, model testing in a seakeeping tank, studies on ice loads, model testing in an ice tank, and analysis of the mooring system.

scholarly journals Laboratory Investigation on Optimum Selection of a Sand Control Method for an Interbedded Sandstone and Mudstone Reservoir

Geofluids ◽  
2020 ◽  
Vol 2020 ◽  
pp. 1-10
Author(s):  
Shaofeng Hu ◽  
Lihua Wang ◽  
Yishan Lou ◽  
Yanfeng Cao ◽  
Wenbo Meng ◽  
...  
Keyword(s):  
Oil And Gas ◽  
Control Method ◽  
Experimental Studies ◽  
Control Design ◽  
Gas Production ◽  
Control Mode ◽  
Critical Parameters ◽  
Bohai Bay ◽  
Sand Production ◽  
Sand Control

It is critical to select an optimized sand control method for an interbedded sandstone and mudstone reservoir (ISMR) due to its serious sand production hazards. However, currently, most general sand control methods cannot meet the requirements of sand control in interbedded sandstone and mudstone reservoirs (e.g., Bohai Bay oil and gas fields from China). Ensuring efficiency of sand control and increasing the oil and gas production rate in this interbedded sandstone and mudstone become more and more important. In this paper, a “multilayer rotatable sand control experimental device” for the interbedded sandstone and mudstone reservoir was developed. A series of sand control experimental studies were conducted by using the proposed device. The net-to-gross ratio (NTG) and well inclinations are two major factors considered in the experimental analysis. In addition, a sensitivity analysis regarding formation particle size distribution (PSD), clay content, and mineral compositions is performed in the experiment under a moderate sand control mode. With systematic experimental test results in this work, combined with numerous existing sand control models, a set of optimum sand control design and the associated optimization template for ISMR were developed, which have been successfully applied in Bohai Bay. Field application results show that NTG and well inclination are two critical parameters in the design of sand control in ISMR. The optimal indexes of a sand control mode are determined as NTG of 0.4 and well inclination of 45°. The introduction of these two key factors in sand control design broadens the application range of moderate sand production.

Independent Assessment of Current Floater Concepts for Floating Wind Application

2021 ◽  
Author(s):  
Gaurav Singhal ◽  
Aengus Connolly ◽  
Manuel Laranjinha ◽  
Colin McKinnon ◽  
Alan Mortimer
Keyword(s):  
Water Depth ◽  
Oil And Gas ◽  
Material Selection ◽  
Renewable Energy Sources ◽  
Pilot Project ◽  
The United States ◽  
Gas Production ◽  
Offshore Wind ◽  
Qualitative Assessment ◽  
Technology Improvement

Most of the offshore wind developments to date, globally, have been bottom-fixed foundations located in shallow waters (<30m water depth) and in close proximity to shore. However, as technology improves and as space for near-shore sites decreases, offshore wind development is projected to trend towards deeper waters. Floating wind is thus expected to become one of the leading renewable energy sources over the next decade or so. Notably, the success of pilot projects in Europe has confirmed the viability of floating wind technology, drawing in additional developers to the market. In the United States, there is a significant potential for floating offshore wind off the coast of California, Maine, and Hawaii. While the majority of current floating wind activity is concentrated in <200m water depth, further technology improvement coupled with experience from floating oil and gas developments will lead to even deeper floating wind projects in the future. One key aspect for floating wind technology is the floater foundation that will support the wind turbine assembly. The entire unit will be moored to the seabed and be subject to challenging environment conditions throughout its service life (akin to a floating oil and gas production facility). There are several floating wind concepts currently in the market - a handful are field-proven at pilot project scale but the majority are still in development phase, each with their own unique offering. The purpose of this paper is to perform an independent qualitative assessment of the current floating wind concepts. The assessment will focus on aspects related to technology readiness, design complexity and scalability, material selection, constructability, installation, operations, and maintenance. This paper provides the offshore wind industry with an unbiased opinion on available designs as well as an insight into perceived challenges for future developments. As a disclaimer, it is noted that Wood has utilized public-domain information for this study and has no preference towards any existing floating wind concepts or designs.

Sign in / Sign up

Export Citation Format

Share Document