bluuebunny/crossref_metadata_2025_split huggingface dataset:
Realizing Value Through Focused HPHT Wells Intervention – The GAMMA Story
Authors: Obakhena O. F. , Biambo T. G , Alli-Oluwafuyi J. , Anijekwu C. , Ogbodu S. , Okolomma E. , Braimah O. , Eke K. 
Published: July 2023

Abstract
Gamma field, a brown onshore field in Niger Delta, Nigeria, has been producing oil and gas from normally hydrostatic pressured reservoirs for over 40 years. In 2017, a drilling campaign, targeting two HPHT natural gas reservoirs, kicked off as part of a gas development project to supply gas to the export gas market. This was the first of its kind in SPDC with seven wells planned to be drilled in a campaign mode to optimize project cost and timing. Being the first experience of drilling and completion of HPHT wells, there were several challenges encountered. Drilling challenges includes stuck pipes and loss of BHAs leading to several hole sidetracks. Completions challenges encountered were sustained high casing head pressures due to material corrosion and inflow impairment due to drilling and completions fluids used.
A very significant challenge was the loss in well productivity of these high-rate HP gas wells due to the heavy barite-weighted drilling mud used to drill the reservoir section (for well control) was also left in hole for over 6 months before well clean up and production. Therefore, there was a mixed outcome from the drilling campaign, with over 50% of the wells experiencing a potential loss (the wells were tested to rates of 20 – 85MMscf/d against an expectation of over 100MMscf/d.
The loss of productivity was adjudged to be due to the caked barite across the reservoir section below the Formation Isolation Valves (FIV) which plugged the sand control screens, resulting in very high drawdowns. Furthermore, two of the wells produced with high casing head pressures (High A-Annulus pressures) equaling the Maximum Annulus Allowable Surface Pressures (MAASP) of the wells and were closed in for well integrity reasons.
As part of well productivity restoration, some premium bespoke cocktail of stimulation chemicals was selected (Imbazi, Oyeintonbra, et al, 2019) and with an effective well intervention program was designed and executed by joint team of local and global Experts. Currently, 5 of the 7 originally planned wells have been restored post well intervention and are producing above expectation.
This paper discusses how the value of these wells are ultimately realized, what was done, what was achieved and how the learnings from the first drilling campaign were incorporated to achieve better results in later wells.
Dimensionless Pressures and Derivative Distribution of Two Interfering Horizontal and Vertical Wells in an Infinite Acting Reservoir
Authors: Emumena E. , Adewole E. S. , Ojah M. G. 
Published: July 2023

Abstract
One of the major guide in achieving a prolong oil production is the accurate description of the reservoir system. This description is essential in all aspects of petroleum engineering and is achievable through reservoir characterization by analytical models based on dimensionless pressures and derivative distribution of two interfering horizontal and vertical wells in an infinite acting isotropic reservoir. In this work, the Gringarten Model and solution to the dimensionless diffusivity equation using Laplace transform and modified Bessel equation is utilized in deriving a solution to the problem of interference testing of an active horizontal well in the presence of an active vertical well located in an infinite acting isotropic reservoir. The Excel and Python software were deployed to compute dimensionless pressures and derivative by the use of superposition principle. Larger magnitudes of dimensionless pressure and derivative would indicate higher oil production for any well design. The work investigates the effects of separation distance between active and observation wells, well lengths and wellbore radius on the pressure response at the observation well. The influence of the number of active wells, Locations and timing of activities of active wells on the pressure response at the observation well has also been investigated. The results obtained from this work can be applied in well placement and spacing decisions during field development as well as in understanding the positive or adverse effects caused by nearby wells during well tests.
Application of a Simulation Approach to Develop Erosional Velocity Correlation for Wells in Oil Rim Reservoirs in the Niger Delta
Authors: Ukpong S. E. , Livinus A. 
Published: July 2023

Abstract
Erosion is a major issue that could be encountered in the oil and gas production and transportation facilities. Oil and gas companies have always tried to develop proper methods to limit erosion to an acceptable level. For many years now, many oil and gas field operators have adopted the America Petroleum Institute recommended practice 14E (API RP 14E) equation to estimate the erosional velocity. Unfortunately, the C-factors in the API RP 14E equation has been generalized, even to conditions and applications where it was invalid, resulting to varying degree of success.
In this work, thousands of well performance simulations were carried out to generate stable operating production rates using data from vertical wells in oil rim reservoirs in the Niger Delta. Approximate model was then developed for erosional velocity calculation using the least square regression method. Furthermore, the developed model was compared with other existing erosional velocity correlations. The new model can be helpful for the design of production facilities for oil rim reservoirs.
Addressing Energy Availability, Accessibility and Affordability Amidst Energy Transition in Africa: Ghana's Outlook
Authors: Oppong Riverson , Asante Ben , Ackah Ishmael 
Published: July 2023

Abstract
In 2015, the UN adopted 17 Sustainable Development Goals. These goals seek to tackle some of the world's greatest challenges by 2030. Goal 7 aims to "ensure access to affordable, reliable, sustainable and modern energy for all". This is an ambition that implies changes in the way energy is produced, accessed, and used.
The research evaluated all five scenarios as presented by the energy transition committee: i. Business-as-Usual Scenario (BaU); ii. Transition Scenario 1 (T1); iii. Transition Scenario 2 (T2); iv. Transition Scenario 3 (T3); and Transition Scenario 4 (T4). Reliability and adequate supply of the sources of the base loads were analyzed; advantages and disadvantages of the scenarios were drawn; emission consequences from the scenarios were also simulated; cost of transition and cost of generation based on the estimated CAPEX and OPEX were modeled.
The energy transition scenarios considered the use of Carbon Capture, Utilization and Storage (CCUS) technology; use of compressed natural gas as base load, electric, hydrogen fuel cell vehicles; sustainable aviation fuel; efficient energy transformation processes; and efficient end-use appliances. Another scenario considered everything under the case above and includes the use of nuclear for power generation.
This research tested the availability, accessibility and affordability of the five main energy transition scenarios Ghana is considering for its transition plan and applied fuzzy logic in selecting the best options.
Impact of Incident Reporting on Operational Risk Management and Accident Prevention in FPSO Operations in Nigeria
Authors: Agbadiba Isioma , Maduagwu Daniel Nduweze 
Published: July 2023

Abstract
The exploration and production of oil and gas in deep waters is very challenging and comes with high operational risks especially in offshore rigs and Floating Production Storage and Offloading (FPSO) facilities. The incidents associated with the operation of an FPSO could be catastrophic with ripple effects that involves socioeconomic, environmental, health and reputational damages as experienced in the British Petroleum Deepwater Horizon accident in the Gulf of Mexico in 2010, which has been described as one of the most catastrophic accident in the history of the oil and gas industry in the US, considering the huge lost recorded. Therefore, the purpose of this paper is to reveal how effective incident reporting can enhance risk reduction and accident prevention in offshore oil and gas facilities with emphasis on the FPSO facilities in the Nigerian Gulf of Guinea and beyond. Mix method of collection data was use, and qualitative and quantitative data were obtained through literature review; semi-structured interviews and online survey. The method of data analysis was Qualitative Analysis method where a Narrative Analysis was used to analyze data from online survey and semi-structured interviews and analysis carried out on how incident reporting can reduce risk and prevent accident. Emphasis is on the need for behavioral change and development of safety culture of unsafe act and unsafe condition reporting as a strategy to prevent accident occurrence was analyzed. This research succeeded in developing a template and a framework for incident reporting that can be adopted in any deep offshore oil and gas projects and operations, especially in FPSO operations, to enhance risk management, accident prevention, enhance operational sustainability and business profitability
Predicting the Hydrogen Storage Potential of Ionic Liquids Using the Data Analytics Techniques
Authors: Sulaimon Aliyu Adebayo , Azman Luqman Adam , Zohair Syed Ali Qasim , Adeyemi Bamikole Joshua , Shariff Azmi B , Yahya Wan Zaireen Nisa 
Published: July 2023

Abstract
In recent years, hydrogen has been an attractive substitute as an energy carrier to fossil fuels, though it is difficult to store by conventional means. Ionic Liquids (ILs) are low-melting salts with varying properties of interest. Experimental investigations into the utilization of ILs as hydrogen storage mediums are still ongoing. This study aimed to predict the solubility of hydrogen in ILs using the data analytics method, whereby the correlations between the ILs’ requisite hydrogen properties and hydrogen solubility were developed and validated. The methodology involves comparing the experimental data from the literature and the simulated data from COSMO-RS software, where predictive correlations were developed using analytical software such as Python. The predictive model can be used to predict the hydrogen solubility of ILs based on the input inherent thermophysical properties of the IL before a particular IL is synthesized and tested in an actual laboratory setting.
Cost Effective Approach for the Recertification of Open-Water Intervention Riser Systems in Nigeria using Asset Integrity Management Tools
Authors: Ademoyegun Adedayo C. , Andrawus Jesse , McCullagh Cathy 
Published: July 2023

Abstract
This paper details the risk-based approach to optimize the recertification cost of Open-water intervention riser systems (OWIRS) in Nigeria. The recertification of Open-water intervention riser systems (OWIRS) is a conservative maintenance program that occurs every fifth year according to recommended practice and client requirements (1) (2) (3).
Reliability and Integrity assurance are critical during any intervention activity because a runaway failure effect could escalate to an unwanted event, potentially impacting HSE, cost, and even reputation (4).
The recertification of the Open-water intervention riser systems (OWIRS) has always been a capital-intensive activity due to the conventional approach deployed by various organizations resulting in a long period of asset unavailability and high cost. Although some notable recommended practices (1) (3) provide guidance but the approach for execution remains with the stakeholders. Due to the current Russia-Ukraine War and continuous drive to stay agile and lean for the removal of wastages, this paper has reviewed the cost element of typical recertification, adopted the hybrid technique comprising Failure Mode, Effect and Criticality Analysis (FMECA), and Reliability Centered Maintenance (RCM) decision tree (5) to develop a cost-effective approach to recertification for OWIRS.
The results showed that specific and value-focused scopes driven through the aggregation of maintenance strategies are efficient. Engrafting an established and critical recertification maintenance scope into existing maintenance programs on Computerized Maintenance Management System (CMMS) that is driven more by a condition-based approach, condition monitoring and proactive tasks from lessons learned from field non-conformances reports and corrective actions provided a significant reduction to waste generated during the planning and execution of recertification project. The integration of recertification as part of the maintenance program is a pathway to saving great cost values of recertification whilst ensuring asset availability and Integrity (4).
Green Technological Approach for Sustainable Operations of Oil and Gas Industry
Authors: Oruwari Humphrey Otombosoba 
Published: July 2023

Abstract
Green technology encompasses evolving group of methods and materials for the production of essential nontoxic products by oil and gas operators. Oil and gas are very important drivers for job creation and a pillar of economic growth in many oil and gas producing countries. They play a prominent role in the development of the developing countries in terms of creating employment opportunities. The oil and gas companies also generate waste and pollution from their practices and businesses because of their informal nature, lack of adequate regulation and supervision. The pollution produced by the oil and gas has contributed immensely to the global warming and natural resource depletion leading to many econonmic, environmental and social problems from climate change to local waste. The methodological framework for the study involved the use of literature review and document analysis. The study articulated the contribution of green technologies to sustainable development of oil and gas. Advantages and disadvantages of eco-friendly technology, policy requirement for oil and gas development and eco-friendly small business ideas are discussed extensively. It highlights some of the benefits of green technology such as drastic reduction in waste and pollution, high level job creation, reduction in the effect of global warming and less material requirements. It also outlines the environmental and economic sustainability of green technology. The study advocates for collaborative effort of government, industries, and individual for its implementation.
Strategies for Decarbonizing the Oil and Gas Industries
Authors: Oruwari Humphrey Otombosoba , Itsekor Lucky 
Published: July 2023

Abstract
The objective of the study is to investigate the strategies for the decarbonization of the oil and gas industry. Strategies are general programmes of action with an implied commitment of emphasis and resources to achieve a basic mission. The greatest problem facing humanity is to transit from fuel-based energy system to a sustainable and decarbonized system. There is no industry with the greatest sustainability challenges than the oil and gas industry because they are known to be among the most polluting industries in the world. The research methodology involved the use of literature review and case study of some companies, data was collected and thematically analyzed. The study findings revealed that oil and gas company can decarbonize the industry by various strategies such as changing power sources, implementing improved technologies and adopting energy efficiency in their operations, flaring through improved additional gas processing and infrastructure, reducing routine flaring through improved reliability of equipment, rebalancing portfolio, the use of renewables, electrifying operations, increasing the use of carbon capture and storage. transformation of carbon dioxide into useful product for example, the use of Carbon dioxide for enhanced oil recovery. In summary it is recommended that the oil and gas industry should diversify by incorporating other forms of energy and technologies with less polluting carbon dioxide and other green gas emission to decarbonize the system. Capacity building and training of personnel is very necessary to cope with these transition strategies in order to meet the Paris climate change target.
Environmental Impact Assessment of Current Synthetic Drilling Fluids in Offshore Oil Fields Using Modified CO2 Evolution Respirometry Technique
Authors: Johnson Folayan Adewale , Dosunmu Adewale , Aleruchi Oriji Boniface 
Published: July 2023

Abstract
Synthetic fluid biodegradation test is one of the essential requirements by environmental regulatory agencies before an approval for offshore cuttings disposal can be granted.
In this study, the aerobic biodegradation tendencies of two industry grade, deep-water synthetic hydrocarbon-based fluids (SHBF and SEBF) were investigated using modified carbon-IV-oxide (CO2) evolution respirometry technique. The results were compared with an ester synthetic fluid that was code-named as ternary mixture of synthetic ethyl esters of plants oil (SEEP-Mixture). A known concentration of the test drilling fluids and reference chemicals was inoculated in a mineral medium, pre-conditioned and incubated by the passage of CO2 free air under aerobic condition in the dark for a period of twenty-eight (28) days at the test temperature of 58°C± 2°C in an aerobic digester. The amount of CO2 evolved from the exhaust air of each composting vessel at intermediate time intervals was measured as dissolved inorganic carbon (DIC) by absorption in Ba (OH)2 solution using titration technique. Sodium benzoate (C6H5COONa) was used as reference fluid sample. The tests were conducted under OECD and OSPAR Commission recommended standard protocols for testing chemicals in the offshore oil industry.
The SEEP mixture ester fluid and the sodium benzoate reference fluid sample are inherently and readily biodegradable because more than 60% of their theoretically available carbon IV Oxide (ThCO2) have been converted to CO2 in the presence of activated sludge inoculum during a 10-day window period with ultimate biodegradability extents of 87.60% and 89.10% respectively at the end of the 28-day test duration. Whereas, the synthetic hydrocarbon fluids have longer lag phase before biodegradation began and they were only fairly biodegradable under the aerobic microbial consortium with ultimate biodegradation values of 51.85% and 62.30% at the end of the 28-days test period for SHBF and SEBF respectively.
Maximizing Production through Optimal Wellbore Placement for Energy Accessibility and Affordability
Authors: Onyeji J. A , Olufisayo Fagbowore , Taiwo B. O , Clement Chukwuka , Eddie Agbongiator , Okorie V. N , Olugbenga Abolarin 
Published: July 2023

Abstract
Considering the high cost of drilling wells in recent times, with associated subsurface geological complexities, and brown fields` operating concerns. It becomes challenging on how to properly drain or recover the remaining oil in place to meet and sustain the ever-increasing demand of energy at affordable cost. This paper streamlines an innovative approach applied to delineate the sweetest spot in a target reservoir through optimal wellbore placement and improved production. Methodology deployed involved looking beyond the bright spot in the seismic volume, with a deep dive into petrophysical parameters of the existing wells, reservoir characterization, utilizing high resolution sequence stratigraphical approach, static modeling and reservoir simulation. The systematic approach utilized aided in delineating the rock properties quality of different regions of the reservoir. After a series of sensitivity tests, a lateral length of 1200 feet was selected to accommodate identified structural and drillability constraints. #-82h wellbore was placed at the sweetest portion of the reservoir. The well production performance has been consistent with over 1,700 barrels of oil per day (BOPD) over the past two years. Lessons learned: optimal well placement in the sweet spot of the target reservoir was guided by lithofacies analysis and reliable dynamic modeling. This remains valuable for reservoir management, maximizing reserves to production. One team approach also aided the timely attainment of the project objectives. The best practice would be to integrate reliable datasets, such as pressure information, fluid rates, well logs, 3D/4D seismic volumes and attributes, to generate representative geologic and simulation models that best depict and predict subsurface ‘architectural` behaviours.
Modelling System Failure of a Typical Hydraulic Power Unit within a Subsea Production Control System
Authors: Slimane S. Ben , Andrawus J. , Iyalla I. 
Published: July 2023

Abstract
Hydraulic Power Unit (HPU) is one of the critical subsystems of a Subsea Production Control System (SPCS). HPU is designed to supply clean and regulated control fluid to remotely operate subsea valves. Failures of HPU can potentially lead to loss of control of subsea valves which are often designed to fail-safe. This automatic production shutdown disrupts normal operation with significant downtime cost. Therefore, optimising HPU's performance is critical to maximising production availability. Modelling System Failures (MSF) is a quantitative maintenance optimisation technique. It aims at determining optimum maintenance requirements by investigating equipment failure patterns. MSF helps select the most efficient and cost-effective maintenance strategy. Failure and maintenance data are collected then analysed. MSF permits the creation and simulation of a system's model to set optimum maintenance tasks.
A typical HPU was analysed using MSF methodology. Generic failure rates of HPU components were extracted from the Offshore and Onshore Reliability Data (OREDA) Handbook. HPU Reliability, Availability and Maintainability (RAM) model was designed using ReliaSoft software packages. The designed model was simulated over a period of 25 years design life of a typical HPU. Appropriate maintenance tasks were determined based on the failure characteristics of the HPU. Mean Availability increased from 97.01% to 99.56%. System uptime increased from 24.25 years (212,441.61 hours) to 24.89 years (218,036.81 hrs) and downtime decreased from 0.75 years (6,558.39 hours) to 0.11 years (963.19 hrs).