Steel Lazy Wave Riser Configuration for Turret Moored FPSO With Disconnectable Turret in Deepwater

2015 ◽  
Author(s):  
Daniel Karunakaran ◽  
Sankar Subramanian ◽  
Rolf Baarholm
Keyword(s):  
Deep Water ◽  
Cost Effective ◽  
Attractive Alternative ◽  
Harsh Environment ◽  
Detailed Case ◽  
Effective Manner ◽  
Water Developments ◽  
Pros And Cons ◽  
Steel Catenary Risers

Recently turret-Moored FPSOs have been used in many deep water developments worldwide, with consideration of disconnectable turrets for harsh environment applications. This trend makes the interactions between FPSO and risers system more important. Further, Steel Lazy Wave Risers (SLWR), which is a compliant variant of the mostly commonly used Steel Catenary Risers (SCR), is becoming an attractive riser option. The paper provides a review of the various riser systems that can be considered for turret-moored FPSOs, and specific emphasis on Steel Lazy Wave Risers. A detailed case study of Steel Lazy Wave Risers for a typical turret moored FPSO with disconnectable turret is presented. This system is described in terms of design and functionalities, the fabrication and installation methods are presented. The case study shows clearly that SLWR are an attractive alternative to be used for FPSO with disconnectable turret and is very efficient to fabricate and install in a very cost effective manner. Pros and Cons for SLWR are discussed, with consideration of the particular challenges of turret-moored FPSOs with large floater motions, hang-off geometry constraints at turret, hang-off loads, riser interferences, risers pre-installation, and turret disconnection constraints.

Long Pile Upending Lifting Study for Fixed Platform on Offshore Oil and Gas Field

2014 ◽  
Author(s):  
Yandong Zhou ◽  
Facheng Wang
Keyword(s):  
Deep Water ◽  
Oil And Gas ◽  
Cost Effective ◽  
Analysis Model ◽  
Gas Reservoirs ◽  
Gas Field ◽  
Water Developments ◽  
Oil And Gas Field ◽  
Offshore Oil And Gas ◽  
Offshore Oil

Fixed platform have been widely employed in the offshore oil and gas reservoirs development. Pile foundation reliability is critical for these platforms where drilling, production and other functions are integrated. The lifting operation for the long pile, being a key step in the jacket installation, has been considered for further developments. With deep water developments, the sizes and weights of long piles are reasonably bigger. The corresponding process and equipment employed are subsequently altered, which brings challenges to developing a cost-effective, easy-operable approach for lifting operation. In this paper, the technology for the offshore long pile upending lifting operation including pile feature, installation methodology, lifting rigging and analysis model, covering water depths ranging from shallow to near deep water zone (60–300 m water depth) has been suggested. In addition, the applicability of the adoptable novel approaches has been discussed considering the practical project experience.

Restoring Technical Potential of Deep-Water Well Impaired by Hydrate Plug Embedded with Wax Deposit with Improved Characterization and Innovative Chemistry

2021 ◽  
Author(s):  
Anwarudin Saidu Mohamed ◽  
Syafiq Effendi Jalis ◽  
Intiran Raman ◽  
Kumanan Sanmugam ◽  
Dhanaraj Turunawarasu ◽  
...  
Keyword(s):  
Melting Point ◽  
Deep Water ◽  
Cost Effective ◽  
Chemical System ◽  
Positive Pressure ◽  
Fluid Temperature ◽  
Temperature Dependent ◽  
Capillary Tubing ◽  
Effective Manner

Abstract Hydrate occurrence is synonymous in deep water wells, notably when the well experience significant reduction in fluid temperature during production. Hence, the operating philosophy must take into consideration the ability to maintain the well-fluid outside the hydrate or wax phase envelope and ensure the contingencies are in place to mitigate any plug, deposit or gel formation. This paper illustrates the characterization of hydrate and wax plug encountered and devise of innovative solution to remediate the blockage in two wells in Sabah waters which were plugged due to cooling of the wells during an unplanned shut down. The solution devised is to set precedence to manage temperature dependent blockages in similar Deepwater wells or facilities. Hydrate and wax models were created to predict blockage severity and its location. Nodal analysis was used to model thermodynamic equilibrium at target location of the plug where the temperature is below the melting point and ultimately to predict the required heat to dissolve the blockages. A Thermo-chemical system was identified, selected, and customized and then injected into well to ensure the temperature generated at the location of the plug was above the melting point of hydrate and wax. Thermo-chemical injection was identified as a viable method of In-situ Heat Generating Technique to generate heat at desired location. The chemical solution was injected via capillary tubing to transmit the heat via conduction and convection to melt the hydrate and paraffinic plug in these 2 wells. An arriving temperature of 40°C at the target zones was required to melt the plug. A positive pressure was maintained in the production tubing during chemical injection to avoid rapid pressure increase as the hydrate plugs dissolved. A temperature of 100 °C was recorded at the wellhead throughout the injection. The downhole gauge indicated positive response, suggesting the heat generated transmitted effectively. After a short duration of injection, communication was established. Hydrate inhibitor was injected to secure the well prior to unloading. The wells were successfully relieved and stabilized production of 1,200 bopd and 800 bopd respectively. The simulation was redesigned based on data collected from the operation to improve the model and to be used for future works. The ability to integrate laboratory analysis, computer aided simulation and operational data was integral to this paper demonstrating an effective way to characterize temperature dependent blockages in production system. Design of experiments provided better insight to address the problem. Innovative use of novel chemistry to produce heat, in-situ heat solved hydrate and wax related issues in a most cost-effective manner. The process of customizing a chemical system based on laboratory and simulation results was effective in ensuring delivery of the results. The bull-heading operation to inject the chemical system proved to be a cost-effective remedial method to unlock the barrels and can be considered preventive or as a contingency measure in dealing with temperature dependent blockages or plugs in future.

scholarly journals Assessment of Organizational Agility in Software Projects

Webology ◽  
2021 ◽  
Vol 18 (Special Issue 01) ◽  
pp. 149-163
Author(s):  
Prabha Masilamani ◽  
M. Suresh
Keyword(s):  
Cost Effective ◽  
Software Project ◽  
Organizational Agility ◽  
Software Projects ◽  
Project Organization ◽  
Business Agility ◽  
Effective Manner ◽  
Current Context ◽  
Case Organization

In the current context of business, agility refers to the dynamic capability of an organization to adapt itself to market and industry demands in a productive and cost-effective manner. Organizational Agility focuses on both stability and dynamism, is more people centric in its approach towards efficient output through faster decision cycles and leveraging technology to manage risks and produce the desired output for its customers. This paper aims at evaluating the organizational agility level from the perspective of people and culture in a software project organization using the multi-grade fuzzy approach. Findings from the case study indicate that the case organization agility index is 6.79 which specifies as ‘agile’. Importance Performance Analysis is used to identify the weaker attributes of case organization. Furthermore, recommendations for the improvisation of weaker attributes of the case organization are discussed.

Design and Optimization of Core Assembly Line for Turbo Charger

2016 ◽  
Vol 852 ◽  
pp. 852-858
Author(s):  
Sa. Paveethrun ◽  
R. Bakthavachalam ◽  
S. Kannan
Keyword(s):  
Assembly Line ◽  
Operation Time ◽  
Cost Effective ◽  
Labor Cost ◽  
Design And Optimization ◽  
Effective Manner ◽  
Turbo Charger ◽  
Operational Improvement ◽  
Dual Arm Robot

This study investigates ‘Manufacturing design for productivity’ surveying a case study of an existing assembly line for Turbo charger Core. The main aim is to investigate the possibilities of operational improvement by reducing number of stations in assembly line in a cost-effective manner by reducing the number of grippers used in complete assembly layout. An assembly line is selected for the case study. An existing assembly is redesigned by using the concepts of methods engineering. Then both cases are analyzed and discussed in terms of their output ability and manufacturing time. After the analysis of redesigned assembly layout it is observed that we can reduce average Operation time by 15 % at the end of this study. At the end of this project, we increased the production quantity from 824 to 955 products. Because efficiency of station work has increased with the redesigned assembly line with aid of dual arm robot. The new assembly line reduces the station idle time and increases its efficiency in operation. The existing assembly line was covering 8 m2 it got reduced to 4 m2 approximately in optimized layout. It is observed 15.89% productivity increased for the same period of time. By the standardization and the elimination of the station operations, and reducing the labor cost the company could increase its competitive strength through the optimized layout design.

Tethered Catenary Riser: A New Deepwater Concept

2013 ◽  
Author(s):  
Jean-Luc Legras ◽  
Baptiste Pillet
Keyword(s):  
Cost Effective ◽  
Field Development ◽  
Dynamic Excitation ◽  
Sea Bed ◽  
Engineering Work ◽  
Heavy Lift ◽  
Water Developments ◽  
Steel Catenary Risers ◽  
The One ◽  
Single Pipe

A new riser concept is proposed by Subsea 7 for field development in deep and ultradeep waters: the Tethered Catenary Riser (TCR)-patent pending. The concept consists of a number of steel catenary risers (SCRs) supported by a subsurface buoy which is tethered down to sea-bed by means of a single pipe tendon and anchored by means of a suction pile; flexible jumpers are used to make the connection between the Floating production Unit (FPU) and the buoy. Umbilicals run without interruption from the FPU to their subsea end while being supported by the buoy. The system has all the advantages of de-coupled riser arrangements: flexible jumpers effectively absorb platform motions, thereby the rigid risers and tendon have very small dynamic excitation. The system can be installed before FPU arrival on site, which improves the time before first oil. Analyses have shown that, with adequate geometry of the buoy, the latter is sufficient stable to induce acceptable tilt and twist when different arrangements of SCRs and flexible jumpers are installed, and under accidental scenarios during the in-place life. The riser system is best designed for a number of risers between 4 and 8, in addition to a number of umbilicals, thus convenient for one or two drilling centers. Results of the basic engineering work on the TCR clearly indicate that it is possible to have a robust design using presently qualified materials and technology. The components used in the TCR are all field proven as they are commonly used in existing riser systems. As a result of installation studies, a method very similar to the one commonly used by Subea7 for Single Hybrid Risers (SHRs) has been selected for the buoy and tether system. Placement of rigid risers, jumpers and umbilicals is as done by Subsea 7 for the Buoy Supporting Risers (BSRs). This method is well adapted for installation by the new Subsea 7 flagship vessel Seven Borealis which is able to perform heavy lift and pipe laying. The Tether Catenary Riser is a credible option for use in deep water developments all over the world. Since all the components, design methods and installation procedures are fully qualified and familiar to Subsea 7, the concept is cost effective and ready for project application.

scholarly journals Pompeii and its Hinterland Connection: The Fuel Consumption of the House of the Vestals (c. Third Century BC to AD 79)

2014 ◽  
Vol 17 (1) ◽  
pp. 27-44 ◽  
Author(s):  
Robyn Veal
Keyword(s):  
Southern Italy ◽  
Cost Effective ◽  
Urban Setting ◽  
Third Century ◽  
Mountain Areas ◽  
Dependent Relationship ◽  
Time Period ◽  
Effective Manner ◽  
Dense Urban Environment

Bio-archaeological studies can contribute significantly to understanding the economic interactions between cities and their hinterland. In Pompeii, where research has often been intramurally focussed, analysis of biological remains is often confined to bones and macro-botanicals consumed as foodstuffs. Charcoal, if collected, often remains unexamined, and yet this material is key to understanding the fuel economy of a city. This study has two goals: first, to describe an efficient method for charcoal sampling and analysis in a dense urban environment using only dry-sieved charcoals above 5 mm; and, second, in doing so, to demonstrate the dependent relationship between Pompeii and its hinterland for the provision of fuel in a case study from the House of the Vestals. A pilot study of 25 contexts from six ‘rooms’ and 750 charcoal fragments was followed by an extended study of 62 contexts over 14 rooms (a total of 1579 charcoal fragments). The extended results identified only two further (minor) taxa (represented by only three fragments). The most important wood identified was beech (Fagus sylvatica), which constituted 50–75 per cent of the fuel supply, depending on the time period. Beech grows preferentially above about 900 m in central and southern Italy. Pompeii lies at 30 m altitude with the nearest mountain areas at least 15 km away. The study suggests that a methodology that relies on collection of charcoal from routine dry sieving (5 mm grid), in soils where this is possible, can provide robust results in a cost effective manner in an urban setting.

Risk Management via Digital Dashboards in Statistics Data Centers

2020 ◽  
Vol 13 (1) ◽  
pp. 27-45
Author(s):  
Atif Amin ◽  
Raul Valverde ◽  
Malleswara Talla
Keyword(s):  
Risk Management ◽  
Real Time ◽  
Data Center ◽  
Cost Effective ◽  
Risk Level ◽  
Total Risk ◽  
Counter Measures ◽  
Effective Manner ◽  
Risk Managers

Every system, when connected to a network, is susceptible to threat of being hacked. It is important to protect all systems of an organization in real-time in a cost-effective manner. This article presents a well-designed and integrated database for risk management data using a dashboard interface in real-time risk that makes it easy for risk managers to reach a understanding the level of threats to be able to apply right controls to mitigate them. In this article, a case study of a data center for a statistical management institute is presented that proposes the calculation of total risk at the organization level by using the proposed risk database. A digital dashboard is also designed for presenting the risk level results so that decision makers can apply counter measures. The risk level on a dashboard viewer makes it easy for decision maker to understand the overall risk level at the statistics data center and assists in the creation of a tool to follow-up risk management since the time a threat hits until the time of its mitigation.

Integrated Semi and Steel Catenary Risers (SCRs) in Deep Water and Harsh Environment Conditions

2006 ◽  
Author(s):  
G. Arnesen ◽  
J.I. Dalane ◽  
S.S.B. Aramanadka ◽  
K. Herfjord ◽  
R. Snell ◽  
...  
Keyword(s):  
Deep Water ◽  
Harsh Environment ◽  
Steel Catenary Risers

LEAN REMANUFACTURING: A CELLULAR CASE STUDY

2007 ◽  
Vol 06 (02) ◽  
pp. 129-144 ◽  
Author(s):  
STEVE L. HUNTER ◽  
J. T. BLACK
Keyword(s):  
Lean Manufacturing ◽  
Cellular Manufacturing ◽  
Lean Production ◽  
Cost Effective ◽  
Assembly Systems ◽  
Design And Implementation ◽  
Detailed Case ◽  
System A ◽  
Manufacturing Assembly

This paper documents the basic manufacturing philosophies and methodologies utilized for the design and implementation of a Lean Manufacturing remanufacture cell. Remanufacture deals with overhauling or reworking products that have been in service and need modification in order to continue to be serviceable. This remanufacturing cell implementation is the first cell of an eighteen-cell manufacturing and remanufacturing system. A systematic detailed case study is utilized as a Lean Production example and proves the flexibility of Lean Manufacturing to be adaptive while being cost effective in the remanufacture arena. This study provides key insights into a concept and strategy for implementing Lean Production thinking — cellular manufacturing. Most factories need significant assistance in understanding how to make Lean Production work; this paper provides many insights into both the theory and application of cellular manufacturing/assembly systems for remanufacture.

scholarly journals Assessing Program Outcomes: Rationale and Benefits of Posttest-then-Retrospective-Pretest Designs

2007 ◽  
Vol 2 (1) ◽  
pp. 118-123 ◽  
Author(s):  
James P. Marshall ◽  
Brian J. Higginbotham ◽  
Victor W. Harris ◽  
Thomas R. Lee
Keyword(s):  
Decision Making ◽  
Program Evaluation ◽  
Cost Effective ◽  
Mentoring Program ◽  
Program Outcomes ◽  
Retrospective Pretest ◽  
Pros And Cons

The importance of program evaluation for decision making, accountability, and sustainability is examined in this article. Pros and cons of traditional pretest-posttest and posttest-then-retrospective-pretest methodologies are discussed. A case study of Utah’s 4-H mentoring program using a posttest-then-retrospective-pretest design is presented. Furthermore, it is argued that the posttest-then-retrospective-pretest design is a valid, efficient, and cost-effective way to assess program outcomes and impacts.

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