bluuebunny/crossref_metadata_2025 huggingface dataset:
Exploring Technical Insights into the Mechanical Adaptation Behavior of the Intuity Elite Bioprosthesis: A Single-Center Experience
Authors: Aljalloud Ali , Lotfi Shahram , Jansen Sebastian V. , Moza Ajay , Menne Matthias , Spetsotaki Konstantina
Published: October 2024

Objectives: Sutureless aortic valve replacement (Su-AVR) is gaining popularity due to its simplified implantation technique and advantages such as shorter operative time. We evaluated the Intuity aortic bioprosthesis and investigated the mechanical adaptation of its prosthetic stent and its susceptibility to cusp fibrosis, dysfunction, flutter, and obstruction after implantation, if any. Methods: N=19 patients received a Su-AVR with the Intuity bioprosthesis at our institution between 2018 and 2020. We analysed the clinical outcomes, anatomical and stereotactical features using the OSIRIX DICOM Pixmeo software CT images, and the radial force (RF) profile using the RX Machine apparatus (Machine Solutions Inc., located in Flagstaff, AZ), for evaluating the valve’s stent according to ISO standards. Results: In all three-dimensional reconstructions, the Intuity stent showed no degree of deformation or ovalisation. Annulus ovality was 0 and 10.4%, respectively, and ovality of the skirt at its open edge was 2 and 19.9%, respectively. Intuity's RF was significantly higher than other transcatheter aortic devices, exceeding the tester's measurement range. Conclusions: The Intuity Elite bio-prosthesis demonstrates remarkable ovality, RFs, and rigidity that could relate to a potential for dynamic adjustment to the hemodynamic patterns in the aortic root postoperatively. Its high RFs at the annulus may explain the resistance to deformation, ensuring harmonious, natural-like cusp mobility. This may reduce the risk of turbulence-induced fibrosis and increased transvalvular pressure gradients, and may clinically translate into less hemolysis. To validate the clinical impact of our findings, if any, additional research with larger sample and extended follow-up is essential.
Transient Elevation of Liver Function Tests and Bilirubin Levels after Laparoscopic Cholecystectomy
Authors: Giakoustidis Alexandros , Gkoutzios Christos , Papakonstantinou Menelaos , Chatzikomnitsa Paraskevi , Gkaitatzi Areti Danai , Myriskou Athanasia , Bangeas Petros , Loufopoulos Panagiotis Dimitrios , Papadopoulos Vasileios N. , Giakoustidis Dimitrios
Published: October 2024

Background
Laparoscopic cholecystectomy constitutes the current “gold standard” treatment of symptomatic gallstone disease. In order to avoid intraoperative vasculobiliary injuries it is mandatory to establish “critical view of safety”. In case of poor identification of the cystic duct and artery leading to a missed intraoperative injury, patients present with elevated liver function tests (LFTs) or increased bilirubin postoperatively. The aim of this study is to present a series of patients of our institute with elevated liver enzymes and bilirubin after laparoscopic cholecystectomy in the absence of intraoperative injury or any other obvious etiology and to provide a possible explanation of this finding.

Methods
From 2019 to 2023, 200 patients underwent elective laparoscopic cholecystectomy at the Papageorgiou General Hospital and at the European Interbalcan Medical Center of Thessaloniki utilizing the “critical view of safety” method. We retrospectively collected the intraoperative reports and the pre and postoperative imaging and laboratory studies of the patients included in this series. Postoperative LFTs and bilirubin levels were extracted and the reason for their transient elevation was examined.

Results
From 200 cases of laparoscopic cholecystectomy, in 6 patients elevated LFTs and bilirubin were found on the first postoperative day, which is suggestive of a missed intraoperative injury. All patients were asymptomatic. During the investigatory workup, a triple-phase CT of the liver and/or an MRCP were ordered, but no pathological findings, such as biliary injury, hepatic artery injury or choledocholithiasis, were found. On postoperative day 3, LFTs and bilirubin levels decreased or normalized without any intervention. No postoperative complications were reported.

Conclusion
In select cases, a transient increase in LFTs and/or bilirubin may be observed in the early postoperative period after elective laparoscopic cholecystectomy in the absence of an obvious etiology. A possible interpretation of these findings could involve the pneumoperitoneum or the anesthesia regimens used intra- or perioperatively. The specific cause however remains undetermined and yet to be examined by future studies.
Experimental Investigation on Atmospheric Microwave Plasma-Driven Nitrogen Fixation Using Metal-Organic Frameworks
Authors: Zheng Fang , Feng Kai , Wu Shaokun , Xiao Wei
Published: October 2024

Microwave plasma-driven nitrogen fixation can occur at atmospheric pressure without greenhouse gas emissions. However, this method still faces the challenge of high energy consumption and low production. Plasma-catalyst combined systems are widely used to increase production and reduce energy consumption in nitrogen fixation. However, the efficacy of current catalysts remains limited. In this paper, the metal-organic framework materials CuBTC and ZIF-8 are combined with the atmospheric microwave plasma for nitrogen fixation. The experimental results show their better catalytic effect than the ordinary catalyst ZSM-5. The maximum nitrogen oxide concentration reaches 33400 ppm, and the lowest energy consumption is 2.05 MJ/mol. Compared to no catalyst, the nitrogen oxide production can be increased by 17.1%, and the energy consumption can be reduced by 14.6%. The transmission electron microscopy (TEM) images of the catalysts reveal obvious differences in the catalyst particle sizes. Notably, catalysts with smaller particle sizes attain higher NOx concentrations compared to their larger counterparts. To the knowledge of the authors, this is the first effort to study the synergistic effects of atmospheric microwave plasma and metal-organic framework materials on nitrogen fixation.
Structural Analysis of Ship Hulls Using Finite Element Methods
Authors: Sarkar Rabby
Published: October 2024

Ship hull is a complex design where various types of complex loading conditions , like as Hydrostatic, Hydrodynamic, Wind, Wave and external internal bending forces. Ensuring structural integrity under these varying loads is essential for the ship structural safety and environmental protection. This review discusses the application of finite element methods(FEM) for the safety of ship hulls and analysis of ship hulls , emphasizing two significant studies that leverage ANSYS SOFTWARE to evaluate stress concentrations and deformation of hull under the various loading operation including the wave and wind forces and the stress. The findings Underscore the importance of analyzing both local and global aspects of ship structures to improve design practices and enhance safety standards. In this paper we mostly focused on a general cargo ships hull structure, Grounding of a ship.
Clinical and Immunological Features in Limpet (Patella sp.) Allergy: A New Trigger of Food Anaphylaxis
Authors: Mederos-Luis Elena , Galán Tania , Martínez María José , González-Pérez Ruperto , Sánchez-Machín Inmaculada , Pineda Fernando , Poza-Guedes Paloma
Published: October 2024

Seafood is a vital source of nutrients, and its consumption has grown globally. Shellfish is a major cause of food allergy and anaphylaxis worldwide, affecting an estimated 0.5-2.5% of the general population. Most basic and clinical research has traditionally focused on crustaceans, leaving the characteristics of mollusk allergy poorly understood. In the Canary Islands, limpets (sea gastropod) are commonly consumed as part of the local cuisine. While some cases of limpet allergy have been reported, there are no published studies featuring large series or detailed clinical analyses of this specific food allergy. A cohort of patients with sensitization to limpet were studied: 66 were monosensitized to limpets (group A), while 64 were also sensitized to other shellfish (group B). Limpet ingestion caused delayed and severe symptoms. In group A, only 11,5% of patients showed positive shellfish allergen detection, compared to 67,9% in group B. The presence of protein bands in the 25-40 and 50-200 kDa range in monosensitized patients distinguishes our study from another researchs. Our study presents the largest reported series of patients with limpet allergy to date. The aim is to analyze the clinical and immunological characteristics of a local sample of limpet-allergic patients, contributing to a better understanding of this emerging condition.
Environmental Impact of Earthquake-Resistant Design: A Sustainable Approach to Structural Response in High-Seismic-Risk Regions
Authors: Bohorquez Alvaro , Viteri Esteban , Rivera Edgar , Avila Carlos
Published: October 2024

The ODS demonstrated the optimal structural response, showcasing equal storey drift compared to the EFS, while emitting 38% less pollution. Furthermore, it only induced approximately 5% more pollution than the system with the lowest contamination levels (OFS). This study concludes that earthquake-resistant design has a direct impact on CO2 emissions in the environment. An effective earthquake-resistant response could have lower levels of pollution; therefore, a balance could be achieved between a good structural response with a reduced environmental impact.
Factors Associated with Opportunistic Infections Among HIV-Positive Patients: A Retrospective Study
Authors: Siduna Kamva , Abaver Dominic
Published: October 2024

Background/objective: A retrospective study was conducted to access better understanding of the prevalence and risk factors of OIs in HIV-positive individuals, informing targeted interventions and enhancing overall health outcomes.
Methods: Medical records 212 of patients (61.79% female, 38.21% male) were accessed to extract relevant information for the study. Fisher’s exact test revealed significant associations between gender, substance abuse, healthy diet practices, and having single or multiple partners with the development of opportunistic infections.
Results: A total of 212 HIV-positive patients were enrolled, with a majority being female (61.79%) and adults aged between 25 and 65 years (68.87%). Most participants were single (83.02%), unemployed (66.9%), and had a history of substance abuse (61.79%). The prevalence of opportunistic infections was 15.09%, with pulmonary tuberculosis being the most common (75%), followed by extrapulmonary tuberculosis (18.75%) and herpes zoster (6.25%). Females were less likely to develop opportunistic infections compared to males (OR=0.26; 95% CI: 0.12 to 0.57; p=0.0007). Patients not using substances were less likely to develop opportunistic infections (OR=0.32; 95% CI: 0.13 to 0.82; p=0.0170). Those with unhealthy diet practices were significantly more likely to develop opportunistic infections (OR=8.46; 95% CI: 3.56 to 20.53; p
Green Marketing and Sustainability: A Critical Review of Environmental, Consumer, Corporate, and Regulatory Perspectives
Authors: Abel Chidera, Emmanuel , Kenechukwu Chinaza, G
Published: October 2024

Green marketing has emerged as an integral strategy in promoting sustainability across various industries, particularly in response to heightened environmental concerns and consumer demands for eco-friendly products. This paper critically reviews the concept of green marketing from environmental, consumer, corporate, and regulatory perspectives, highlighting both its opportunities and challenges. From the environmental standpoint, green marketing aims to mitigate the negative impacts of industrial activities by promoting products that are less harmful to the environment. On the consumer side, increasing environmental awareness drives demand for sustainable products, though challenges such as greenwashing often undermine consumer trust. Corporately, green marketing offers opportunities for enhancing brand image and competitiveness, though balancing profitability and sustainability goals remains a challenge for businesses. Regulatory frameworks play a crucial role in shaping green marketing practices, ensuring transparency and accountability, and preventing deceptive practices like greenwashing. The paper also discusses emerging trends such as digital transparency, the role of social media in green marketing, and the incorporation of circular economy principles into corporate strategies. The review concludes with recommendations for businesses to enhance their green marketing efforts, emphasizing the need for transparency, stakeholder collaboration, and interdisciplinary approaches to address complex sustainability challenges.
Strategies to Enhance Diagnostic Capabilities for the New Drug-Resistant Tuberculosis (DR-TB) Drugs
Authors: Saktiawati Antonia Morita Iswari , Vasiliu Anca , Saluzzo Francesca , Akkerman Onno
Published: October 2024

The global burden of drug-resistant tuberculosis (DR-TB) continues to challenge healthcare systems worldwide. There is a critical need to tackle DR-TB by enhancing diagnostics and drug susceptibility testing (DST) capabilities, particularly for emerging DR-TB drugs. This endeavor is crucial to optimize the efficacy of new therapeutic regimens and prevent the resistance and overuse of these invaluable weapons. Despite this urgency, there remains a lack of comprehensive review on public health measures aimed at improving the diagnostics and DST capabilities. In this review, we outline strategies to enhance the capabilities especially tailored to address the challenges posed by resistance to new DR-TB drugs. We discuss the current landscape of DR-TB drugs, existing diagnostic and susceptibility testing methods, notable gaps and challenges in these methods, and explore strategies for ensuring fair access to DST while narrowing these disparities. The strategies include public health interventions aimed at strengthening laboratory infrastructure, workforce training, and quality assurance programs, technology transfer initiatives, involving drug developers in the DST development, establishing national or regional referral hubs, fostering collaboration and resources pooling with other infection control efforts, extending testing access in underserved areas through public-private partnerships, advocating for lowering costs or loans at low-interest, remote technical support, and implementing mandatory molecular surveillance monitoring. This review underscores the urgent need to enhance DST capacities for new DR-TB drugs and identifies opportunities for innovation and improvement. Assessing the extent of the global health impact of these measures is crucial to ensure their effectiveness in combating DR-TB.
KESIAPAN MENTAL IBU MUDA DARI PERNIKAHAN USIA DEWASA AWAL DI KOTA SURABAYA
Authors: Lailiyah Khofifah Nur , Rofif Naufal Hakim  , Galuh Aulia Mukti  , Kholida Ulfi Mubaroka
Published: October 2024

Fenomena menikah muda atau di umur dewasa awal bukan lagi sebuah hal tabu di masyarakat kita. Banyak dari mereka memutuskan untuk menikah muda dengan alasan cinta dan tanpa berpikir panjang mengenai risiko yang akan dihadapi selama mengarungi bahtera rumah tangga. Hal ini tentu mempengaruhi mental dari ibu muda karena kondisi fisik dan mental yang belum mumpuni, sehingga rentan mengalami stres. Tak jarang, keputusan untuk menikah muda di umur dewasa awal membawa bencana lain, seperti masalah finansial. Oleh karena itu, penelitian dilakukan untuk mengkaji kesiapan mental ibu muda yang menikah di usia dewasa awal di kota Surabaya. Penelitian ini menggunakan metode kualitatif dengan pendekatan deskriptif dan menggunakan teori fenomenologi. Pengumpulan data menggunakan teknik observasi mendalam serta wawancara terstruktur. Hasil penelitian menunjukkan mental merupakan hal paling penting dalam melangsungkan pernikahan, khususnya di umur dewasa awal yang terbilang masih belum memiliki pemikiran dan kontrol emosi yang matang. Banyak dari ibu muda yang merasa pada akhirnya merasa stres akibat belum siap secara fisik, emosi, dan mental, hal ini timbul karena mendapat tekanan harus mengurus keluarga di umur yang tidak tepat. Tidak hanya itu, perempuan yang menikah di umur dewasa awal cenderung mengalami risiko kesehatan fisik seperti komplikasi dalam kehamilan bagi ibu, serta kesehatan anak.
HUBUNGAN PERILAKU MAKAN DAN AKTIVITAS FISIK DENGAN STATUS GIZI REMAJA DI SMA NEGERI 1 SEI RAMPAH
Authors: Sardi Mahdalena , Erli Mutiara  , Esi Emilia  , Risti Rosmiati  , Novita Sari Harahap
Published: October 2024

Status gizi merupakan keseimbangan antara zat gizi yang diterima tubuh dari makanan yang dikonsumsi dapat dipengaruhi oleh perilaku makan dan aktivitas fisik. Tujuan dari penelitian ini bertujuan untuk mengetahui hubungan perilaku makan dan aktivitas fisik dengan status gizi remaja di SMA Negeri 1 Sei Rampah. Penelitian ini merupakan penelitian observasional dengan desain penelitian cross sectional. Lokasi penelitian di SMA Negeri 1 Sei Rampah pada bulan November 2022-Februari 2023, dengan jumlah sampel sebanyak 71 remaja. Sampel diperoleh menggunakan teknik random sampling. Pengumpulan data dilakukan secara langsung dengan cara pengukuran antropometri dan pengisian kuesioner. Analisis bivariat dilakukan dengan uji rank spearman dan analisis multivariat dilakukan dengan uji regresi linier berganda. Hasil penelitian menyatakan perilaku makan remaja termasuk kategori kurang baik 50,7%. Aktivitas fisik remaja termasuk kategori sedang 90,10%. Status gizi remaja termasuk kategori kurang 43,70%. Uji rank spearman menunjukkan terdapat hubungan yang signifikan antara perilaku makan dan aktivitas fisik dengan status gizi (p=0,000, 0,000). Uji regresi linier berganda menunjukkan terdapat hubungan yang signifikan antara perilaku makan dan aktivitas fisik dengan status gizi remaja dengan Y = -1,906 + 0,062 + 0,002 (p=0,000) artinya terdapat hubungan antara perilaku makan dan aktivitas fisik dengan status gizi remaja di SMA Negeri 1 Sei Rampah, serta perilaku makan merupakan faktor yang paling dominan berhubungan dengan status gizi.
MARRIAGE EDUCATION PRACTICES AT RECONCILIATION SCHOOLS
Authors: Dhuha Hadiyansyah  , Wiwin Luqna Hunaida  , Zaharil An’asy
Published: October 2024

This paper aims to explore community-based marriage/family education practices conducted by the Reconciliation School. The Reconciliation School is an effort to help individuals achieve a better, happier, and more peaceful life by addressing emotional wounds caused by dysfunctional families. In its training sessions, the Reconciliation School adopts therapeutic methods developed by John Bradshaw and Virginia Satir. Interviews conducted by the author with several participants reveal positive impacts on their relationships with their spouses, children, parents, and themselves after undergoing therapy and training. As a conclusion, this paper suggests that community-based family education initiatives like the Reconciliation School should be expanded and potentially adopted to strengthen the family system in Indonesia, where the divorce rate currently hovers around 12-15 percent.
Analysis of changes in demographic load in the context of healthy aging of the country’s population.
Authors:   The Federal State Budget Scientific Institution “The N. A. Semashko National Research Institute of Public Health” of the Ministry of Science and Higher Education of the Russian Education, Karpova O. B. , Zagoruychenko А. А. ,   The Federal State Budget Scientific Institution “The N. A. Semashko National Research Institute of Public Health” of the Ministry of Science and Higher Education of the Russian Education
Published: October 2024

The increase in the demographic burden is associated with the ongoing demographic aging of the population, a decline in the birth rate in recent years and an increase in the proportion of elderly people in the total population. The purpose of the study is to analyze the dynamic changes and trends in the demographic burden of the population in the context of healthy aging of the country’s population. Materials and methods. The research materials are limited to the results of the analysis of official statistical information, in particular, for the analyzed period (2009–2023). The following methods were used: statistical, comparative analysis, study and generalization of experience. The obtained data were processed using modern software packages SPSS22 and MS Excel 2007. Results. In the course of this study, statistical data on the demographic burden of the population in urban and rural settlements in Russia were studied, the methodological basis for calculating this indicator was analyzed, the values in different countries of the world were compared, and modern trends in the context of healthy aging of the country’s population were compared. Conclusion. The results of this study can be used in the preparation of medium-term demographic forecasts and state programs aimed at improving the quality of life of the population and creating optimal conditions for the healthy aging of citizens.
Kepemimpinan Kenabian dalam Pengembangan Pendidikan Karakter Siswa SD IT Assalaam Sanden Kabupaten Bantul
Authors: Tomi  , Suryabudi Yusuf Atma , Arifin Zainal
Published: October 2024

The purpose of education is none other than to shape the character and behaviour of individuals and learning groups in order to have a character spirit in accordance with the norms. In formal education, there has been a moral and moral crisis in students. Prophetic leadership is closely related to the formation of a person's behaviour and character, especially in the context of education that aims to educate and form morals. Prophetic leadership can have a significant impact on school organisations. Prophetic leadership plays an important role in the figure or example of people in the surrounding environment. This research was conducted at the level of Islamic basic education involving principals, teachers, and students related to the implications of the application of prophetic leadership on the development of character education in students. Data collection was done by interview and documentation. The data obtained in the form of exposure to interview information sources are then condensed, analysed and will be verified in accordance with the validity of the data. This study aims to describe the phenomenology of prophetic leadership and its relation to student character education at SD IT Assalaam Bantul. The results of the study explain that the principal in leading educational institutions has implemented prophetic leadership by integrating prophetic traits in its management. With a characterful principal leader, it is able to have a positive influence on the surrounding environment, especially for students, because the principal in the scope of education is a central role model. SD IT Assalaam Sanden Kabupaten Bantul has a programme of development activities that can shape the character of students according to Islamic teachings and uphold Islamic values.
Enhancing Sustainability and Efficiency in Gas Dehydration: Smart Optimization of Molecular Sieve Unit Regeneration
Authors: Bakr M. Khaleel
Published: October 2024

The objective of this study is to optimize the regeneration criteria of Molecular Sieve Units (MSUs) to enhance sustainability and operational efficiency in gas dehydration processes.

The methodology involves revising the regeneration cycle of MSUs to align with current operational demands. By analyzing the underutilization of desiccant beds within the existing 12-hour adsorption cycle, a tailored regeneration cycle was implemented. This strategy focuses on reducing fuel gas consumption and electricity usage, while extending the operational lifetime of the desiccants. The process includes a detailed assessment of current operations and the development of an optimized regeneration schedule.

Implementing the revised regeneration cycle led to substantial improvements: an 85% reduction in fuel gas consumption and an 83% decrease in electricity usage. The desiccant's operational lifetime was extended from 5 years to 25 years, significantly reducing downtime and maintenance requirements. Additionally, the optimization resulted in notable reductions in spare parts usage and operational expenses (OPEX). The environmental benefits, including reductions in greenhouse gas (GHG) emissions, are currently being quantified. This approach demonstrates the potential for significant environmental and economic gains, highlighting the importance of tailored regeneration cycles in enhancing the efficiency and sustainability of gas dehydration processes.

This paper introduces a novel optimization strategy for MSU regeneration cycles, demonstrating significant improvements in resource utilization and operational efficiency. It provides valuable insights into extending the operational life of desiccants and reducing energy consumption, contributing to the sustainable management of industrial operations.
Maximizing CO2 Sequestration and Utilization Using Viscoelastic Surfactants Alternating Gas: Optimizing Efficiency and Environmental Impact
Authors: Elmuzafar Ahmed M
Published: October 2024

Greenhouse gases, particularly CO2, are driving significant environmental challenges, necessitating urgent measures to mitigate their impact. CO2 Enhanced Oil Recovery (EOR) presents a viable strategy for contributing to net-zero emissions by capturing and injecting CO2 underground to boost oil recovery, while promoting sustainable energy production. Despite its promise, the high mobility of CO2 poses risks such as viscous fingering, which limits recovery efficiency. Our study addresses this challenge by integrating viscoelastic surfactants (VES) into the CO2 injection process to maximize recovery and CO2 storage. The dual functionality of VES plays a critical role: CO2 reduces heavy oil viscosity, while VES increases the viscosity of the displacing phase and reduces interfacial tension (IFT), improving capillary action and enhancing both oil recovery and CO2 trapping.

A calibrated simulation model was employed, using data from a core flooding experiments conducted at 90°C and 1500 psi combined with micro-CT imaging, to optimize recovery and CO2 sequestration. The model was history-matched to experimental data to define the critical capillary number for desaturation and to refine the curvature of the relative permeability curves across various flooding schemes. Several scenarios were tested, examining the influence of injection rates, slug sizes, and the sequence of CO2 and VES injections. Results from these simulations confirmed the effectiveness of VES in controlling CO2 mobility. When VES is injected before CO2, it diverts gas flow into smaller pores, increasing capillary trapping and minimizing gas breakthrough. This leads to improved oil recovery and enhanced CO2 storage, with CO2 dissolution in brine and mineral trapping contributing to long-term sequestration.

The optimal injection sequence achieved a recovery factor of 59%, surpassing the recovery of other tested sequences. Additionally, the best-performing scenario resulted in a CO2 storage volume of 4,071 cc under standard conditions (SC). These findings demonstrate that incorporating VES into the CO2 EOR process significantly improves both recovery efficiency and CO2 trapping. By optimizing the injection sequence and ensuring that critical capillary numbers for desaturation are exceeded, this approach not only maximizes oil recovery but also provides a viable solution for large-scale CO2 storage in depleted reservoirs.

The application of VES combined with CO2 offers a promising pathway to more sustainable oil production while contributing to global carbon sequestration efforts. This method enables more efficient use of potential storage reservoirs, advancing efforts toward environmental sustainability and helping to mitigate the effects of greenhouse gas emissions.
Synergistic Effect of MgO Nanoparticles and SDS Surfactant on Interfacial Tension Reduction for Enhanced Oil Recovery
Authors: Kandiel Youssef E. , Metwalli Farouk I. , Khalaf Rafik E. , Attia Gamal M. , Mahmoud Omar
Published: October 2024

Innovative methods to enhance oil recovery efficiency remain a high priority in the energy sector. This study investigates the potential of magnesium oxide (MgO) nanoparticles, both alone and with sodium dodecyl sulfate (SDS) surfactant, to improve oil recovery by reducing the interfacial tension (IFT) between oil and water. The research focuses on the physicochemical properties of MgO nanoparticles and their efficacy in IFT reduction, critical for Enhanced Oil Recovery (EOR).

Preparation of MgO nanofluids was achieved using a Magnetic Stirrer and Sonics Vibracell VCX 750 Ultrasonic Homogenizer to ensure thorough mixing and dispersion. Characterization involved measuring density with Calibrated Density Bottles, dynamic and kinematic viscosity using a Falling Ball Viscometer, pH levels with an Electronic pH meter, and electric potential difference (mV). The Malvern Zetasizer Nano ZS assessed Zeta Potential (mV), Electric Conductivity (mS/cm), and Electrophoretic mobility (µmcm/Vs) for both the nanofluid and the surfactant-nanofluid systems.

Paraffin oil served as the oil phase, with nanoparticle (NP) concentrations tested at 0.01, 0.03, 0.05, 0.1, and 0.5 wt%. The SDS concentration remained constant at 0.5 wt% throughout the study. We employed Pendant Drop Interfacial Tension measurements to evaluate the oil-water, oil-nanofluid, and oil-nanofluid + surfactant systems.

Significant IFT reduction was observed—from 47.9 to 26.9 mN/m with a 0.1 wt% MgO nanofluid. Even a minimal concentration of 0.01 wt% MgO NP decreased notably from 47.9 to 41.8 mN/m. An IFT reduction of up to 70% was noted when MgO NPs were combined with SDS. This IFT reduction enhances oil mobility, suggesting the MgO-SDS system as an effective EOR technique. The study also recorded shifts in Zeta Potential from −2.54 to 3.45 mV and more alkaline pH levels from 8.4 to 10.8, indicating the nanofluid's altered surface charge and interaction dynamics. These physicochemical changes, aided by SDS, improved the dispersion and stability of MgO nanoparticles at the oil-water interface, thus boosting oil displacement efficiency.

These findings highlight the potential of the MgO-SDS system as a cleaner alternative to traditional EOR methods that use toxic chemicals, offering economic benefits from enhanced reservoir performance. However, practical challenges remain, including ensuring nanoparticle stability and compatibility under diverse reservoir conditions, managing surfactant adsorption, and scaling up to field-level operations. Future research must address these issues while maintaining interdisciplinary collaboration and rigorous field studies.

In conclusion, incorporating MgO nanoparticles and SDS surfactant presents a promising approach to improving oil recovery efficiency. Further investigation into its field application and economic feasibility is essential to gauge the potential of this technology in the energy industry.
Petrophysical Evaluation of Tight Gas Sand Using NMR and Conventional Logs
Authors: Hamada G. M. , Abushanab M. A. , Oraby M.
Published: October 2024

Petrophysical evaluation of heterogeneous gas sandstone reservoirs is one of the most difficult problems. These reservoirs usually produce from multiple layers with different permeability and complex formation, which is often enhanced by natural fracturing. Therefore, using new well logging techniques like NMR or a combination of NMR and conventional open hole logs, as well as developing new interpretation methodologies are essential for improved reservoir characterization. Nuclear magnetic resonance (NMR) logs differ from other conventional logs. Integration of NMR logs, other open hole logs and SCAL minimizes uncertainties in the determination of formation porosity, permeability and capillary pressure curve.

This paper concentrates on determination of three petrophysical parameters of heterogeneous gas sand reservoirs; 1) Determination of DMR porosity, ΦDMR, it is deduced from NMR porosity and density porosity, 2) NMR permeability, KBGMR, it is based on the dynamic concept of gas movement and bulk gas volume in the invaded zone and 3) Capillary pressure, it is derived from relaxation time T2 distribution.
35% Oil Increase for Gas Lift Platform Using Transient Modelling Approach
Authors: El-dessouky M. E. , El-Bohoty A. M. , Nasr A. A. , Abd-Ellatif M. S. , Mykaid O. A. , Ali A. M.
Published: October 2024

In the oil and gas industry, gas lift is a widely used artificial lift method to boost the oil wells production, particularly when the reservoir pressure is low enough to lift the fluid to the surface. Nevertheless, this application used to face several challenges which affected its processes and led to investing more costs to keep its operations running successfully. This paper summarizes a comprehensive study aimed at optimizing the gas lift operations for one of the crucial offshore oil platforms in the Gulf of Suez Petroleum Company (GUPCO) in Egypt, at minimal costs through the application of a holistic transient modeling approach.

While the steady state modeling approach is useful to many engineering processes in the O&G industry, it is not suitable for modeling the gas lift systems as it can experience many transient phenomenon such as transferring of the gas injection point to different levels across the well different operations, changing of the valves setting pressure to accommodate the variation in the temperature happened at the well's different production phases, pressure surging incidents that might occur due to the sudden closure of valves, and the presence of slug flow which can be attributed to improper gas lift design or due to the change of the formation fluid characteristics causing drastic changes in the production rates. Accordingly, a transient modeling approach had been applied to resolve all these gas lift dynamic issues. The findings provide valuable insights into the design, operation, and troubleshooting of the overall gas lift systems using multiple scenarios, including redesigning the valves operating pressures, adjusting the gas injection rates, recommending deeper points of injection, exchanging some types of the installed operating valves, advising a cleanup program for both the wellbores & the gas lift mandrels, and detecting the plugged valves that need to be exchanged in the next intervention plans.

The project resulted in increasing the net oil gain for the platform under study by 1500 BOPD (35% Gain) after applying some wellbores interventions as recommended by such a holistic modeling approach. The study also includes the cost measures of such services with a focus on finding the most cost-saving method, thus it helped GUPCO reach its production target with minimal efforts & costs.

This paper marks an exceptional solution for perfecting the gas lift applications in GUPCO by allowing the simulation of all the dynamic operations of the gas lift systems which helped in solving all the unstable production incidents & the unloading failures that cannot be captured using the customary steady state gas lift modeling approach, thus, it encouraged GUPCO to consider the gas lift transient modeling as a fundamental element in the optimization of all the future gas lift operations.
Downhole Wireline Tractor Glide in Horizontal Wells of UAE
Authors: Singh Chawla Tamanjot
Published: October 2024

Horizontal wells drilled in recent years in the UAE are becoming mature, yet wireline movement in such conditions is often restricted and hindered by high dogleg angles. The increased expense and risks at each stage—drilling, completion, and production—challenge the improvement of wireline interventions in horizontal wells. During workover intervention activities, deploying tractor tools has been crucial for the success of wireline operations in the UAE. This approach significantly diminishes client's rig time and well costs while critically limiting HSE risks associated with CTU conveyance. This paper presents utilization of tractors for wireline interventions in the challenging UAE field.

The tractor's gearbox is designed to convey a maximum torque of 1.2 ft-lb, enhancing the reliability of the tractor under high-temperature conditions over an extended period. The tractor is engineered to perform at a consistent full load output of 25,000 psi and 350°F. The wheel configuration has been optimized for traction and longevity, providing a more comprehensive approach to downhole conveyance.Torque is transmitted from the motor to the drive wheels through a series of gears built into the arms. The force magnitude is adjusted automatically in response to the applied load, maintaining traction throughout the horizontal range. The arm profile is designed to push well debris sideways, helping to avoid buildup ahead that could hinder progress along the well.

The success of logging and perforating with a tractor has proven its capacity to convey heavy gun strings and withstand the stress associated with the high shock created during perforation. Incorporating tractor technology for wireline intervention has demonstrated improved operational efficiency and significant cost savings.

The smaller footprint compared to CTU unit deployment for horizontal conveyance and the logging-from-anywhere capability of tractor deployment are particularly beneficial in offshore operations. The hazards inherent in overall intervention costs are minimized as a result. Creating sustainable solutions reduces the demand for CTU-conveyed wireline conveyance in horizontal wells.This paper highlights the innovative strategy of utilizing downhole tractors to support the long-term integrity of enhanced wireline interventions in an eco-friendly and cost-effective manner.
Successfully Engineered and Delivered a Highly Inhibitive Anti-Accretion Drilling Fluid System for Drilling Ancestral Nile Fill Well in the North Beni-Suef Area
Authors: Kamel Mohamed , Alsaeed Akram , Elsharkawy Mahmoud
Published: October 2024

Petrosilah, a joint venture between the Egyptian General Petroleum Corporation (EGPC) and IPR Lake Qarun Petroleum (IPR LQP)/Pharos Energy, holds a stake in the North Beni-Suef (NBS) exploration concession in Egypt's Western Desert. Drilling the Ancestral Nile Fill clastic deposits in offset wells west of the Nile has historically posed significant challenges due to borehole instability and highly reactive formations. These challenges have led to numerous drilling complications, including pack-off tendencies, tight holes, severe to complete losses, casing hang-ups, and mechanical sidetracks.

Traditional approaches to mitigate these issues have relied on expensive mud additives, heavy mud weights, varying casing depths, conditioning trips, and continuous reaming. Although the Drilling with Casing (DwC) system has been utilized, it has inherent limitations. To address these challenges, Petrosilah, in collaboration with Baroid Drilling Fluids, developed a novel approach to optimize a cost-effective drilling fluid formulation that enhances wellbore stability while reducing the overall cost impact observed in previous Beni-Suef offset wells.

The optimization process was divided into two key phases: planning and execution. The planning phase involved gathering and analyzing data, including sampling the Ancestral Nile Fill formation from offset wells at a sister company. These samples were assessed against various highly inhibitive fluids commonly used in the Egyptian Western Desert. Through rigorous laboratory analysis, particularly using linear swell meter results, a clear advantage emerged for a silicate-based fluid enriched with 3-5% v/v GEM GP, which was ultimately selected after evaluation against well objectives.

In the execution phase, the selected silicate-based fluid demonstrated remarkable efficiency during field application, delivering best-in-class performance in the first two exploration wells, NBS-SW-1X and NBS SW-5X.

This paper details the step-by-step process and methodologies employed in fluid selection, Ancestral Nile Fill formation analysis, and field observations, leading to the successful application of the silicate/GEM GP drilling fluid. This innovative approach effectively tackled previous drilling issues in the Beni-Suef wells’ intermediate sections, eliminating borehole instability and significantly reducing drilling costs. This work represents a substantial advancement in drilling practices for challenging environments.
Maximizing Mediterranean Gas Exploration Success Rate and Revolutionize Subsurface Imaging of The Reservoir Heterogeneity with Artificial Intelligence-Assisted Workflow
Authors: Hafez Ahmed
Published: October 2024

A successful gas exploration/appraisal drilling campaign of the Pliocene-aged complex deep-water incised canyon reservoir in the Mediterranean Basin is achieved with outstanding results through applying an innovative integrated workflow that firmly assisted with the artificial intelligence (AI) algorithms and technologies. The convolutional neural network (CNN) algorithm is the core building block of the workflow, which enabled us to recognize and delineate the internal depositional architectural elements of the incised canyon reservoir (i.e. 4th/5th order channels) directly from the 3D seismic data with high-level of accuracy. Six 4th/5th order channels have been successfully delineated within the deep-water incised canyon of interest. Three discrete depositional facies have been robustly distinguished for each 4th/5th order channel through implementing Kohonen self-organizing mapping (Kohonen SOM) algorithm. This enabled for confident high-resolution assessment of the reservoir facies and properties heterogeneities. A robust 3D reservoir model has been built utilizing the outcomes of the AI-assisted workflow, which then used to optimize the subsurface locations of the exploration and appraisal wells targeting the reservoir sweet spots. An appraisal well has been optimized and successfully drilled that encountered 102 m of net pay thickness. The long production test of the well has been shown 38 MMscf/d production rate, which is a very good commercial rate. The workflow is a major step in maximizing the exploration success rate of the Mediterranean Basins through accurate delineation of the deep-water turbidite reservoir heterogeneities and complexities, as well as in other basins where similar settings exist. By applying the workflow, the subsurface complexities were revealed with the artificial intelligence algorithms, uncertaintie s were captured, risks were reduced and project commercial value was uplifted.
A New Approach for Rock Strength Estimation Using Lab Test Measurements in the Southern Gulf of Suez
Authors: Abdelghany W. K. , Elkhawaga M. , Abdelhalim K. , Saad A. , Emara A. A.
Published: October 2024

Rock strength is an essential parameter for geomechanical modeling. Many correlations are normally used for rock strength modeling. These empirical relationships are developed for specific basins, rock types, and ages different from the studied basin. Therefore, UCS needs to be validated using quantitative data on core samples. This paper represents a new approach for UCS estimation using lab test measurements for the first time in the Gulf of Suez.

More than ninety core plug samples were used for the analysis, selected from twenty-seven wells distributed in ten different fields along the southern Gulf of Suez. The samples represent different facies, rock types, and rock strengths to help in monitoring the variation of the results based on each different parameter. A conventional uniaxial compressive strength test was proceeded in which confining pressure was zero. Well logs such as density and sonic logs used to build different relationships with the resulting UCS measurements.

Rock strengths are generally influenced by the physical and elastic properties of rocks. Different rock types have different log-strength relationships, based on their lithology, age, burial history, and consolidation state. Therefore, it is important to avoid applying a relationship calibrated for one rock type to another. Correlations using interpreted parameters such as clay content or total porosity using conventional regression analysis provided a better strength prediction model. In addition, Calibration was improved by using dynamic elastic moduli as they exploit two independent tool responses (sonic and bulk density) which are often more sensitive to strength variations than density or sonic alone and are not overly reliant on interpreted logs. An actual sand management study proceeded using the new empirical equation results to validate it showed good matching.

The results of the study represent a pioneering approach of using actual lab test measurements to calibrate the UCS values in the Gulf of Suez. The new data enhanced the geomechanical model results extremely, especially while proceeding sand management studies, which are sensitive to the UCS values.
Integrated Approach for 3D Complex Carbonate Reservoir Modelling: A Case Study of the Dahra Southeast Field, Sirte Basin
Authors: Elbashir M. B. , Saad N. , Benissa T. , Elakuri A.
Published: October 2024

The study's main objectives are to create a representative static model to be used for the Dahra Southeast field development plan. Moreover, understands the tectonic history and characterizes the fault system by evaluating and modeling the fault system within the field. A structural framework approach using volume-based modeling (VBM) was employed to address the complexity of fault modeling. This approach ensures that all 35 faults are accurately modeled without compromise, and resulted grid cells maintain orthogonality with minimal distortion. Subsequently, structured stair-stepped griding was constructed from the Petrel Structural framework model. To model the Facies and the rock types, trend maps based on thickness fraction were employed to guide the distribution of facies and rock types. Additionally, the porosity and permeability distributions were biased by the rock types. Furthermore, the Saturation Height Function was utilized to estimate water saturation distribution, the uncertainty analysis was conducted. The Dahra reservoir which is one of the Great Mabruk field reservoirs, situated within a shallow marine, rimmed carbonate platform, primarily consists of limestone with occasional dolomite streaks. Diagenetic processes significantly impact porosity and permeability, further complicating the distribution of facies and petrophysical properties. In the NW part of the field, reef-derived limestone overlies back-reef shoal deposits. Cores from central wells reveal proximal shallow-water carbonates, suggesting deposition in a shallow lagoon occasionally interrupted by sub-aerial exposure. These cores also exhibit dolomite streaks. The 3D-created model aligns with the depositional conceptual model and observed trends. Additionally, the successful distribution of petrophysical properties enables precise estimates of hydrocarbon volume, and an excellent history match is achieved. This study was a part of a full field development plan for Dahra Southeast Reservoir. The static model paved the way for strategic prediction scenarios aimed at enhancing oil production in the field.