Perf-and-Wash Cement Placement Technique as a Cost-Effective Solution for Permanent Abandonment of a Well with Multiple Permeable Zones: A Case Study from North Sea, UK

2018 ◽  
Author(s):  
Galen Joneja ◽  
Svetlana Nafikova ◽  
James Reid ◽  
Anton Rublevskyi ◽  
Jose Salazar
Keyword(s):  
North Sea ◽  
Cost Effective ◽  
Effective Solution ◽  
Placement Technique

Development of subsea tie-backs in challenging environments

2014 ◽  
Vol 54 (2) ◽  
pp. 540
Author(s):  
Gregor Couper ◽  
Sina Roshan-Zamir ◽  
John Rickman ◽  
Chris Lee
Keyword(s):  
Cost Effective ◽  
Weather Conditions ◽  
Severe Weather ◽  
Short Length ◽  
Effective Solution ◽  
Established Method ◽  
Constraint Factors ◽  
Successful Execution ◽  
Stage Process

Tie-backs to existing facilities are a long established method of expanding developments, as they often offer a cost-effective solution. For short length tie-backs located in regions that are remote and/or subject to severe weather conditions, however, the feasibility of installation can become a significant constraint. Factors such as high mobilisation cost of pipelay vessels and conditions that make pipeline towing impractical limit the potential design solutions. Defining these constraints early in the project is critical to successful execution. This extended abstract explores the challenges faced when developing such a tie-back by considering a case study of Origin Energy’s Geographe development, located in the Otway Basin. The location and harsh weather conditions constrained the viable installation options, which shaped the design. A flexible flowline was selected because it could be installed from a wider range of vessels and in a less limiting weather window. Subsea coolers are located at the wells for control of top of line (TOL) corrosion and to protect the flexible flowline from exposure to overly high temperatures. The cooler design brings its own challenges, requiring a two-stage process. First, modelling of the production fluid is used to determine the cooling requirements; then, CFD is used to design the cooler piping and structure to achieve this. A design with multiple, smaller structures was used to maximise the number of capable installation vessels. This extended abstract discusses the constraints that can occur, how the design must accommodate them, and the implications on execution of the project.

scholarly journals Process Plant Upgradation Using Reliability, Availability, and Maintainability (RAM) Criteria

2022 ◽  
Vol 2022 ◽  
pp. 1-17
Author(s):  
Dongqiao Bai ◽  
Qi Yang ◽  
Jian Zhang ◽  
Shouzhi Li
Keyword(s):  
Modular Design ◽  
Cost Effective ◽  
Market Survey ◽  
Effective Solution ◽  
Process Plant ◽  
Process Plants ◽  
Reliability And Availability ◽  
Expected Outcomes ◽  
Selection Of

The objective of this study is to propose a solution for process plant upgradation becoming extinct due to obsoleteness of spares. The study will help in reliability, availability, and maintainability (RAM) based upgradation of control system of process plants in developing countries. Available options for plant upgradation are compact control, modular, and semiautomatic. RAM based upgradation provides solution which is high in reliability and availability (usually all parts are replaced with upgraded and compatible technology) and is easy to maintain throughout the service life of process plant. Case study for stacker and reclaimer of cement plant upgradation is considered to both implement and evaluate the idea. Upgradation methodology is finalized by expert’s feedback regarding selection of hardware with respect to availability, market survey to validate the opinion, and economical availability viability of selected hardware. Pre- and postupgradation scenarios are analyzed to validate the implementation of study and conclude the expected outcomes. The process plant upgradation yielded a cost-effective solution to the problem with automation increasing by 17%, plant maintainability increasing by 80%, and downtime of plant decreasing by 17%. Among all available options, modular design Op1 is considered the best choice that can satisfy RAM criteria.

scholarly journals CASE STUDY OF SPILL RESPONSES UNDERTAKEN BY AND PRACTICAL ISSUES OF IMPLEMENTING A TIER 2 AERIAL DISPERSANT AND SURVEILLANCE SERVICE IN WEST AND CENTRAL AFRICA1

2005 ◽  
Vol 2005 (1) ◽  
pp. 443-446
Author(s):  
Simon Dewhirst
Keyword(s):  
Central Africa ◽  
Cost Effective ◽  
Tier 2 ◽  
Effective Solution ◽  
Global Alliance ◽  
Effective Response ◽  
Video Footage ◽  
West And Central Africa ◽  
The Will

ABSTRACT Following detailed investigation into the need and practical issues involved, The Global Alliance successfully implemented a cost effective solution to provide a Tier 2 regional aerial dispersant and surveillance service in West and Central Africa (WACAF). The will paper provide a case study ofi) The practical issues concerned with the implementation of the project from conception, through development and implementation. Transboundary issues concerning the logistics and deployment of the service and location of depots are discussed along with the need for the oil community to work closely together and with national authorities are discussed.ii) The solution and rationale adopted to enable an effective response and cost effective service.iii) The response and lessons learnt by The Global Alliance following the deployment of the service to two live spills in the region. Video footage of the aircraft trials and an actual spill response will be provided along with details of the aircraft and associated equipment.

Making Workovers Easy and Cost Effective: Turning Old Ways into New Opportunities

2021 ◽  
Author(s):  
Mustansar Raza ◽  
Hossam Elmoneim ◽  
Kris Looten ◽  
Omar Elzanaty ◽  
Ahmed Shakeel ◽  
...  
Keyword(s):  
Gas Flow ◽  
Short Interval ◽  
Cost Effective ◽  
No Production ◽  
Wellbore Integrity ◽  
Open Hole ◽  
Gel Composition ◽  
Cement Plug ◽  
Placement Technique

Abstract A case study and methodology is presented to shed the light on the different processes followed during the placement of a non-damaging isolation barrier in a group of highly naturally-fractured and vugular gas wells. The temporary isolation aims at isolating the wellbore from the troublesome formation and allow the removal of the original completion string and install a new redesigned one. The process helped putting the wells back on production with-out the need to stimulate any of them. This helped client to reduce the overall workover cost by 40% and proved to be successful and efficient to complete the required operation in a time-efficient. The operator had 4 wells with OH sections ranging from 40-80m which were completed in the late 1990's with no production packer. To preserve wellbore integrity the completion string needed to be pulled and replaced by a string with production packer and DH gauges. Visco-Elastic Surfactant (VES) and calcium CaCO3 (carbonate) used ubiquitously in field operations were tested for optimal design to fill highly fractured OH without damaging formation. Caliper logs were not available, and the presence of natural fractures posed a challenge to calculate the actual OH volume. A system was developed to carry the CaCO3 into the wellbore in stages and slickline was employed to measure fill after each stage. Once the OH was filled with CaCO3 and well would support a fluid column coil tubing was used to place an acid-soluble cement plug in the short interval between casing shoe and end of tubing (6-9m). The paper describes the optimization process followed to tune the CaCO3 pads composition, gel composition, mixing and placement technique. The first well in the campaign required more than 10 times the theoretical volume of CaCO3 to fill the open hole with multiple settling issues at surface. It was concluded the surfactant gel was likely carrying the CaCO3 into the fractures. The procedure was modified to tie in a line of breaker solution to the well head allowing sufficient viscosity of the fluid to carry the CaCO3 from surface but immediately lose viscosity and allow the CaCO3 to settle in the open hole without being carried into the formation. Specific coil tubing procedures were employed to allow the setting of ultra-short acid soluble cement plugs (<6m). All wells were successfully isolated to allow the safe workover of the completion string and returned to production with no loss of gas flow, with-out the need to stimulate after the work over. The campaign exhibited a new method of employing existing technologies to achieve the objective in a highly challenging and relatively new oilfield of Kurdistan. The campaign also demonstrated the benefit, in terms of saving time and cost because of extensive pre-execution planning.

Dry and Wet Tree Damper Chamber Column Semisubmersible Design in Harsh Environment

2011 ◽  
Author(s):  
Alaa M. Mansour ◽  
Laurence Upston ◽  
Yaming Wan
Keyword(s):  
Structural Design ◽  
Cost Effective ◽  
Time Domain Analysis ◽  
Effective Solution ◽  
Integration Approach ◽  
Service Conditions ◽  
Large Water ◽  
Steel Weight ◽  
Fully Coupled

The Damper Chamber Column Semi is a new semisubmersible conceptual design that is developed to provide a cost effective solution that can be used in deepwater dry or wet tree applications. The new semisubmersible design resembles the conventional design with a ring pontoon. However, in the new design, the columns have been configured with free flooding inner damper chambers; hence the name Damper Chamber Column Semi (DCC Semi). At quayside and during wet tow, the column configurations provide large water plane area for stability purposes, while for the in service conditions the inner chambers are flooded and the trapped water provides considerable amount of “free” added mass that significantly reduces the semisubmersible motion response. In this paper the performance of the DCC Semi located in Gulf of Mexico (GoM) environment has been simulated using fully coupled time domain analysis. Numerical results are presented for the platform motion and the tensioner stroke to demonstrate the platform performance feasibility. Structural design is performed to confirm the steel weight and establish the column connection details of the new design. The paper also presents the topside to hull quayside integration approach for this case study.

Disposable Fibre Optic Intervention System: Case Study of Successful Leak Detection Offshore North Sea

2021 ◽  
Author(s):  
Craig Feherty ◽  
Andrew Garioch ◽  
Annabel Green
Keyword(s):  
North Sea ◽  
Single Mode ◽  
Cost Effective ◽  
Leak Detection ◽  
Fibre Optic ◽  
Distributed Temperature Sensing ◽  
The North ◽  
First Case ◽  
Well Data

Abstract Maintaining well integrity is critical to sustaining production from mature and aging fields. Disposable fibre optic technology has been deployed in wells in the North Sea to locate known tubing leaks in the completion. The disposable fibre optic intervention system releases a probe into the well to enable the deployment of bare fibre optic line. The fibres are released from the probe as it descends into the well. In the presented case study, the probe contained both single-mode and multi-mode fibre optic lines to enable simultaneous Distributed Temperature Sensing (DTS) and Distributed Acoustic Sensing (DAS) surveys to be performed. Once deployed in the well, pressure manipulation programs were performed to activate any tubing or casing leaks while acquiring DTS and DAS data. As a result of the exceptional sensitivity of the bare fibres and the effective coupling of the fibre with the tubing wall the technology is shown to be highly effective in detecting leaks and confirming barrier integrity. In the presented example a leak was located along with the direction and rate of the fluid movement in the ‘B’ annulus. The simplicity of the system and highly efficient operations greatly reduced survey times in comparison to conventional intervention techniques thereby greatly reducing the cost of intervention. It can be demonstrated that the disposable fibre optic deployment system provides a game changing and cost-effective solution for both leak detection and determining liquid levels in the wells. The disposable fibre solution is a unique deployment method which provides an alternative to conventional well surveys, reducing the complexity, time and cost to acquire valuable distributed well data. This is the first case history published for this technology in leak detection application.

scholarly journals Prospects of Developing Prefabricated Masonry Walling Systems in Australia

Buildings ◽  
2021 ◽  
Vol 11 (7) ◽  
pp. 294
Author(s):  
Julian Thamboo ◽  
Tatheer Zahra ◽  
Satheeskumar Navaratnam ◽  
Mohammad Asad ◽  
Keerthan Poologanathan
Keyword(s):  
Environmental Performance ◽  
Structural Characteristics ◽  
Cost Effective ◽  
Future Research ◽  
Limited Attention ◽  
Effective Solution ◽  
The Past ◽  
Masonry Construction ◽  
Made In

Prefabrication has been shown to be an effective way of construction in the modern-day context. Although much progress has been made in developing reinforced concrete (RC), timber and steel prefabricated elements/structures, prefabrication of masonry walling systems has received limited attention in the past. Conventional masonry construction is labour-intensive and time-consuming; therefore, prefabrication can be an effective solution to accelerate the masonry construction to make it more cost-effective. Therefore, in this paper, an attempt has been made to evaluate the effectiveness of prefabricated masonry systems (PMS) in terms of their structural characteristics and sustainability perspectives in an Australian context. Subsequently, the available studies related to PMS and the prospects of developing prefabricated masonry walling systems were appraised and reported. In order to assess the applicability of PMS, a case study was carried out by designing four types of prospective prefabricated masonry walling systems for a typical housing unit in Australia. It was shown that the reinforced (RM), post-tensioned (PT) and thin layered mortared (TLM) masonry systems are better suited for prefabrication. Later, in order to assess the sustainability of the considered masonry walling systems, life cycle energy analyses were carried using the Environmental Performance in Construction (EPIC) database. It was found that there can be nearly 30% and 15% savings, respectively, in terms of energy saving and CO2 emissions in prefabricated construction than the conventional masonry construction. Finally, the prospects of developing PMS and the need for future research studies on these systems are highlighted.

Ten Demi-Culverins for Aldeburgh: Whitehall, the Dunkirkers, and a Suffolk Fishing Community, 1625–1630

2019 ◽  
Vol 58 (2) ◽  
pp. 315-337 ◽  
Author(s):  
Thomas Cogswell
Keyword(s):  
North Sea ◽  
East Coast ◽  
Central Government ◽  
Fishing Community ◽  
Close Attention ◽  
The North ◽  
The North Sea ◽  
The Impact

AbstractHistorians have not paid close attention to the activities of freebooters operating out of Dunkirk in the late 1620s. This essay corrects that omission by first studying the threat from Dunkirk to England's east coast and then addressing how the central government, counties, and coastal towns responded. A surprisingly rich vein of manuscript material from Great Yarmouth and particularly from the Suffolk fishing community of Aldeburgh informs this case study of the impact of this conflict around the North Sea.

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