Gas Wells with Carbon Steel Completion, Can it Handle Sour Gas Production, Case Study

2021 ◽  
Author(s):  
Abdelrahman Gadelhak ◽  
Andrey Yugay ◽  
Gervasio Pimenta ◽  
Adeel Allah Bux ◽  
Mohamed Baslaib ◽  
...  
Keyword(s):  
Carbon Steel ◽  
Task Force ◽  
Gas Production ◽  
Close Monitoring ◽  
Gas Wells ◽  
The North ◽  
Successful Case ◽  
Corrosion Resistant Alloy ◽  
Sour Gas

Abstract Title Gas wells with Carbon steel completion, Can it handle sour Gas production, Case Study. Objective/Scope It is a successful case of producing sour gas (up to 18% H2S and 9.2% CO2) since 2016 wells with carbon steel tubing with maintaining downhole chemical injection of corrosion inhibitor. Methods, Procedures, Process During 2014 a group of new wells has been drilled in X giant onshore gas reservoir under ADNOC onshore company operating area to maximize gas production and to meet production mandate. Majority of wells has been drilled within the North and peripheral Area of the reservoir. All wells has been completed with a standard completion with a Top completion (+/-7000 ft.) in carbon steel with downhole chemical injection valve, and a corrosion resistant alloy section below the CIV. After wells commissioning, high H2S contents were observed (Up to 18%), and Management initially instructed operations to shut in 9 wells and formulated a task force to study the applicable options and analyze the data to ensure asset integrity. The TF recommendation was to flow the wells with close monitoring of wells integrity, in particular annulus pressure A comprehensive downhole exercise has been done by Results/Observation/Conclusion Carbon steel completion with downhole chemical injection is a validated completion solution for such conditions. Novel/ Additive information Clearly, case is as a solid reference for sour gas production using conventional completion, sustaining Long-term production is adding more weight to the case conclusion.

Extending Production Life of Mature Fields in the North Sea with Multilateral Technology

2021 ◽  
Author(s):  
Matthew Kelsey ◽  
Magnus Raaholt ◽  
Olav Einervoll ◽  
Rustem Nafikov ◽  
Stian Amble
Keyword(s):  
Environmental Impact ◽  
North Sea ◽  
Construction Costs ◽  
The North ◽  
Economic Production ◽  
Successful Case ◽  
Isolation Methods ◽  
Cumulative Production ◽  
The North Sea

Abstract Multilateral technology has for nearly three decades extended the production life of fields in the North Sea by delivering a higher recovery factor supported by the cumulative production of the multiple laterals. Additionally, operators continue to look at methods to reduce the environmental impact of drilling and intervention. Taking advantage of the latest multilateral technology can turn otherwise unviable reservoirs into economically sound targets by achieving a longer field life while minimizing construction costs, risk, and environmental impact. This paper will focus on mature fields in the region that have used multilateral applications for wells that were reaching the end of their life and have been extended to further economic production. This paper discusses challenges faced to provide a multilateral solution for drilling new lateral legs in existing wells where there is a lack of available slots to drill new wells. Additionally, discussion will cover completion designs that tie new laterals into existing production casing. The case study will include discussion of workover operations, isolation methods, and lateral creation systems. The paper focuses on the challenges, solutions, and successful case study of a retrofit multilateral well constructed in the North Sea which extended production life in a mature field by using innovative multilateral re-entry methods. The paper also provides insight as to methodology for continually improving reliability of multilateral installations to maximize efficiencies.

Research and Application of Material Corrosion Prevention Technology in the Completed well System for Sour Gas well

2013 ◽  
Vol 712-715 ◽  
pp. 1096-1099
Author(s):  
Ling Feng Li
Keyword(s):  
Steel Corrosion ◽  
Gas Production ◽  
Corrosion Prevention ◽  
Gas Reservoirs ◽  
Gas Field ◽  
Gas Well ◽  
Corrosion Resistant Alloy ◽  
System Life ◽  
Sour Gas

For natural gas well in sour gas reservoirs, very serious corrosion in the completed well system is an important factor of gas production system life. In order to ensure the long-term development of gas wells, this paper mainly introduces material corrosion prevention technology in the completed well system, such as corrosion-resistant alloy steel corrosion control technology, bimetallic combination tubing, corrosion inhibitor technology and so on. By taking LJ Gas Field as an example, this paper introduces the material corrosion prevention technology in the completed well system in LJ Gas Field. For application in the completed well system in LJ Gas Field, the technology above have good performance of corrosion resistance.

Inspection of Clad and Plain Carbon Steel Girth Welds on Offshore Caisson Risers Using Semi-Mechanised Ultrasonic Testing (SMUT)

2008 ◽  
Author(s):  
Robert J. Conder ◽  
Ryan McPherson ◽  
Ton Kooren ◽  
Allan Parlane
Keyword(s):  
Carbon Steel ◽  
Oil And Gas ◽  
Plain Carbon Steel ◽  
Gas Production ◽  
Carbon Steels ◽  
Inconel 625 ◽  
Inspection System ◽  
Oil And Gas Production ◽  
The North ◽  
Girth Welds

Caisson risers installed through drilling slots are an increasingly common method to add additional riser access to existing oil and gas production platforms. This paper describes the inspection methodology used for two new caisson risers on the Talisman Energy owned Tartan platform in the North Sea. The methodology for qualification of the inspection system for both plain carbon steels and Inconel 625 (UNS N06625) clad carbon steel is described. The offshore performance of the SMUT system is discussed and the time and safety benefits of this system are highlighted.

Optimizing Tubing and Liner Completion Design to Improve Gas Production from Existing Wells: Case Study for ADNOC Onshore Field Abu Dhabi, UAE

2021 ◽  
Author(s):  
Magdy Farouk Fathalla ◽  
Mariam Ahmed Al Hosani ◽  
Ihab Nabil Mohamed ◽  
Ahmed Mohamed Al Bairaq ◽  
Djamal Kherroubi ◽  
...  
Keyword(s):  
Gas Production ◽  
Base Case ◽  
Gas Wells ◽  
Production Rates ◽  
Liquid Loading ◽  
Gas Field ◽  
Well Production ◽  
Well Completion ◽  
The Impact

Abstract An onshore gas field contains several gas wells which have low–intermittent production rates. The poor production has been attributed to liquid loading issue in the wellbore. This study will investigate the impact of optimizing the tubing and liner completion design to improve the gas production rates from the wells. Numerous sensitivity runs are carried out with varying tubing and liner dimensions, to identity optimal downhole completions design. The study begins by identifying weak wells having severe gas production problems. Once the weak wells have been identified, wellbore schematics for those wells are studied. Simulation runs are performed with the current downhole completion design and this will be used as the base case. Several completion designs are considered to minimize the effect of liquid loading in the wells; these include reducing the tubing diameter but keeping the existing liner diameter the same, keeping the original tubing diameter the same but only reducing the liner diameter, extending the tubing to the Total Depth (TD) while keeping the original tubing diameter, and extending a reduced diameter tubing string to the TD. The primary cause of the liquid loading seems to be the reduced velocity of the incoming gas from the reservoir as it flows through the wellbore. A simulation study was performed using the various completion designs to optimize the well completion and achieve higher gas velocities in the weak wells. The results of the study showed significant improvement in gas production rates when the tubing diameter and liner diameter were reduced, providing further evidence that increased velocity of the incoming fluids due to restricted flow led to less liquid loading. The paper demonstrates the impact of downhole completion design on the productivity of the gas wells. The study shows that revisiting the existing completion designs and optimizing them using commercial simulators can lead to significant improvement in well production rates. It is also noted that restricting the flow near the sand face increases the velocity of the incoming fluid and reduces liquid loading in the wells.

Natural Language Processing and Text Mining Approaches in Production Shortfalls Analytics: Methodology, Case-Study and Value in the North Sea

2021 ◽  
Author(s):  
Edgar Bernier ◽  
Sebastien Perrier
Keyword(s):  
Natural Language Processing ◽  
Text Mining ◽  
Natural Language ◽  
Language Processing ◽  
North Sea ◽  
Gas Production ◽  
The North ◽  
Wide Range ◽  
The North Sea

Abstract Maximizing operational efficiency is a critical challenge in oil and gas production, particularly important for mature assets in the North Sea. The causes of production shortfalls are numerous, distributed across a wide range of disciplines, technical and non-technical causes. The primary reason to apply Natural Language Processing (NLP) and text mining on several years of shortfall history was the need to support efficiently the evaluation of digital transformation use-case screenings and value mapping exercises, through a proper mapping of the issues faced. Obviously, this mapping contributed as well to reflect on operational surveillance and maintenance strategies to reduce the production shortfalls. This paper presents a methodology where the historical records of descriptions, comments and results of investigation regarding production shortfalls are revisited, adding to existing shortfall classifications and statistics, in particular in two domains: richer first root-cause mapping, and a series of advanced visualizations and analytics. The methodology put in place uses natural-language pre-processing techniques, combined with keyword-based text-mining and classification techniques. The limitations associated to the size and quality of these language datasets will be described, and the results discussed, highlighting the value of reaching high level of data granularity while defeating the ‘more information, less attention’ bias. At the same time, visual designs are introduced to display efficiently the different dimensions of this data (impact, frequency evolution through time, location in term of field and affected systems, root causes and other cause-related categories). The ambition in the domain of visualization is to create User Experience-friendly shortfall analytics, that can be displayed in smart rooms and collaborative rooms, where display's efficiency is higher when user-interactions are kept minimal, number of charts is limited and multiple dimensions do not collide. The paper is based on several applications across the North Sea. This case study and the associated lessons learned regarding natural language processing and text mining applied to similar technical concise data are answering several frequently asked questions on the value of the textual data records gathered over years.

scholarly journals Militia Participation in Counterinsurgency: The Impetus of Civilian Joint Task Participation in Combating Boko Haram in Nigeria

2019 ◽  
Vol 21 (3) ◽  
pp. 460-469
Author(s):  
Modu Lawan Gana
Keyword(s):  
Task Force ◽  
Government Officials ◽  
Boko Haram ◽  
The Public ◽  
The North ◽  
Joint Task ◽  
Depth Interview ◽  
Joint Task Force ◽  
The Government

Since 2013, the north of Nigeria has witnessed an increased involvement of the militia group ‘Civilian Joint Task Force’ (CJTF) in combating the Islamist insurgent group Boko Haram. The mobilization of the Civilian Joint Task Force brought a tremendous success to the counterinsurgency operation. Before the CJTF’s engagement, the antiterrorism efforts of the government were marred by negligent performance. In addition to helping decrease the attack frequencies and number of fatalities caused by the insurgent group, the militia succeeded in expelling Boko Haram fighters from the towns and villages they had previously occupied. However, the unprecedented participation of the Civilian Joint Task Force in the counterinsurgency campaign has raised certain suspicions of the public in regards to the CJTF’s ulterior motives. This paper, therefore, explores the motives that triggered people’s participation in the Civilian Joint Task Force with the aim to combat the Boko Haram insurgent group. The current paper is a qualitative research, designed as a case study. The empirical data were collected by means of an in-depth interview involving 13 respondents, among who were the members of the CJTF, community leaders and government officials in Yobe State, Nigeria. The findings show that people’s participation in the CJTF is voluntary, with the main motivation being the necessity to defend the community due to the state’s failure to provide adequate protection. The article points out an urgent need to demobilize and deradicalize the participants in order to prevent the CJTF from further jeopardizing local communities’ peace and stability.

Sour Gas Well Testing Challenges-A Successful Case Study

2019 ◽  
Author(s):  
Mubashir Ahmad Mubashir ◽  
Fawad Zain Yousfi ◽  
Mohamed M. Albadi ◽  
Mohamed A. Baslaib ◽  
Omar Al Jeelani ◽  
...  
Keyword(s):  
Well Testing ◽  
Gas Well ◽  
Successful Case ◽  
Sour Gas

Sour Gas Production Challenges-CASE Study

2020 ◽  
Author(s):  
Mubashir Mubashir Ahmad ◽  
Fawad Zain Yousfi ◽  
Mohamed Albadi ◽  
Mohamed Baslaib ◽  
Shamsa Alhouqani ◽  
...  
Keyword(s):  
Gas Production ◽  
Sour Gas

WATER TREATMENT RESULTING FROM THE EXPLOITATION OF GAS DEPOSIT - CASE STUDY

2020 ◽  
Author(s):  
Carmen- Matilda Marinescu (Badica) ◽  
Marius- Nicolae Badica ◽  
Silvian Suditu ◽  
Monica Emanuela Stoica
Keyword(s):  
Water Treatment ◽  
Oil And Gas ◽  
Gas Production ◽  
Gas Wells ◽  
Production Time ◽  
Oil And Gas Wells ◽  
Filter Type ◽  
Over Time

The water produced is the water brought to the surface through the oil and gas wells. It is made of natural deposit water, mixed with the hydrocarbons in the deposit. Due to the fact that more and more deposits are reaching maturity, the volume of water produced increases over time, so its disposal is now mandatory and conditions the continuation of gas production. Separation of the impurity gases is carried out within the group of probes, by means of installations called liquid separators. They are mounted on the path of each pipe of the well's supply, and their maintenance is equal to the duration of the probe's production time. The mounting of the separators for the adduction wells is usually done inside the well group, so that they can be controlled and exploited according to some rigorously designed schemes. This study presents the separation of the gases from the water using the separators with F.S. filter type

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