Article
Geochemistry & Geophysics
QinShan Yang, Kuang Qin, Jeff Olson, Marvin Rourke
Summary: This paper introduces a new Deformation-and Eccentricity (DEC) tool, based on electromagnetic technology, for measuring casing deformation and tubing eccentricity while logging inside completion tubing. The tool generates a compressed-and focused magnetic field and employs an array of magnetic sensors to measure the magnetic flux density distributions. This technology allows for a quick and accurate assessment of well integrity.
Article
Engineering, Petroleum
Bruce Tunget, Pengyuan Lu, Andrea Cammarano, Nader Karimi, Manosh Paul
Summary: This paper evaluates the feasibility of pushing severed production tubing instead of pulling it to access casing, emphasizing the importance of confirming existing seals and placing suitable sealants in P&A decision-making. It also explores the use of smaller rigless units to compact tubing into a well's liquid space for casing access, aiming to extend rigless P&A use and cost savings.
SPE DRILLING & COMPLETION
(2021)
Article
Energy & Fuels
Caroline Johnson, Morteza Haghighat Sefat, David Davies
Summary: The decommissioning of hydrocarbon wells is essential for restoring the integrity of the cap rock and isolating sub-surface formations with flow potential. Well plug and abandonment (P&A) costs are a significant part of decommissioning expenses, making careful planning crucial to avoid costly remedial operations. The development of a novel modelling framework for risk-based analysis of P&A designs is seen as a key step towards cost-effective decommissioning. Preliminary results show the value and robustness of this framework in assessing leakage risk associated with different well P&A design scenarios.
JOURNAL OF PETROLEUM SCIENCE AND ENGINEERING
(2021)
Article
Thermodynamics
Rodrigo Y. Tobisawa, Marcelo J. S. de Lemos
Summary: This study investigates the process of particle filtration by turbulent flows and explores the impact of key parameters on filtration efficiency through mathematical modeling. Results indicate that porosity, permeability, and Reynolds number significantly affect pressure drop, with larger particle diameter filters showing wider stagnant zones.
INTERNATIONAL COMMUNICATIONS IN HEAT AND MASS TRANSFER
(2022)
Article
Engineering, Multidisciplinary
Ankang Cheng, Nian-Zhong Chen
Summary: This paper discusses the structural integrity and engineering critical assessment of deep-water subsea pipelines under high pressure/high temperature conditions. A new specified ECA scheme is developed, considering corrosion fatigue and low-cycle fatigue.
INTERNATIONAL JOURNAL OF PRESSURE VESSELS AND PIPING
(2022)
Article
Thermodynamics
Kesiany M. De Souza, Marcelo J. S. de Lemos
Summary: This paper presents an improved one-dimensional nonstationary model for simulating the reaction propagation of aluminum and iron-oxide in thermite mixtures. The model includes improvements such as a correction in the energy conservation equation and a temperature limit to account for aluminum vaporization. Numerical simulations were done to analyze the effects of kinetics parameters, alumina dilution, and aluminum addition on the main characteristics of the reaction wave. The results show that certain conditions can prevent disruption of the system and that aluminum addition accelerates the propagation.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2023)
Article
Energy & Fuels
Arianna Gea Pagano, Grainne El Mountassir, Rebecca Jane Lunn
Summary: This study presents a proof of concept for using colloidal silica (CS) based grout to improve well sealing in plug and abandonment operations. The research demonstrates the successful deployment of CS grout up to a depth of 1500 meters and its potential for repairing fine-aperture cracks, reducing permeability values by three orders of magnitude.
JOURNAL OF PETROLEUM SCIENCE AND ENGINEERING
(2022)
Article
Management
Steffen J. Bakker, Akang Wang, Chrysanthos E. Gounaris
Summary: This article presents an approach to address the endogenous learning effects in vehicle routing operations, applied to the planning of an offshore plug and abandonment campaign. By incorporating observed learning data and investigating the effects of learning and cooperation, the results show significantly better solutions compared to neglecting the learning effect.
EUROPEAN JOURNAL OF OPERATIONAL RESEARCH
(2021)
Review
Energy & Fuels
Chiemela Victor Amaechi, Grant Hosie, Ahmed Reda
Summary: In order to save costs and prevent unnecessary shutdowns, operators of oil and gas need an effective subsea pipeline integrity management system. Many subsea pipelines have exceeded their design lives but are still operated safely and in compliance with regulations and standards. Older flowlines often lack permanent pigging facilities, so operators use various inspection and monitoring techniques to gather essential integrity management data. However, translating this data into meaningful information can be challenging. This paper presents a holistic approach to implement pipeline integrity management tools for safe operation and maintenance, as well as reviews the integrity of ageing pipelines.
Article
Energy & Fuels
Hang -Ming Liu, Yang-Ye He, Ji-Fang Wan, Lin Chen, Xian-Zhong Yi, Yuan-Hua Zhou, Yu-Xian He, Xiang-Gui Ming, Lu Ren
Summary: This paper presents a study on improving the quality of wellbore plug barriers using active mechanical excitation. The effects of different vibration parameters on the properties of the wellbore plug cement material were investigated, and the optimal combination of excitation parameters was determined. The results showed that mechanical vibration effectively eliminates internal porosity and improves the density and strength of the cement plug. The findings provide important guidance for the design of vibration plugging tools and operational specifications.
Article
Thermodynamics
Fabricio J. C. Pena, Marcelo J. S. de Lemos
Summary: The Thermal Plug and Abandonment (TP&A) technology introduces a new method by igniting a chemical mixture to generate enough heat for sealing a well, providing a more efficient approach to well plugging procedures.
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2021)
Review
Health Care Sciences & Services
Nithya Krishnamurthy, Alyssa A. Grimshaw, Sydney A. Axson, Sung Hee Choe, Jennifer E. Miller
Summary: This article systematically reviews the root causes, facilitators, and barriers of drug repurposing. The study finds that promising drugs are often shelved due to insufficient efficacy, poor market prospects, and industry consolidation. Inadequate resources, data access, and IP negotiation challenges are key barriers to the full potential of drug repurposing. Multi-partner collaborations, access to compound databases, and tax incentives are key facilitators for repurposing.
BMC HEALTH SERVICES RESEARCH
(2022)
Article
Engineering, Marine
Mohammad Yazdi, Faisal Khan, Rouzbeh Abbassi
Summary: Microbiologically Influenced Corrosion (MIC) poses a significant challenge to offshore oil and gas facilities, leading to pinholes and leaks. Preventive (coatings, cathodic protection) and mitigative (inhibitor and biocide treatment) actions are crucial for pipeline integrity management. A multi-objective functional methodology involving dynamic continuous Bayesian network modeling and a genetic algorithm is proposed to minimize operational risks associated with MIC.
Article
Chemistry, Multidisciplinary
Paraskevi Kapetanopoulou, Antigoni Kouroutzi
Summary: The study assesses the adoption of information systems by Greek industry, revealing that most industries have adopted IS to conduct business. The main motivation for IS adoption is to reduce errors in business activities, while cost remains a primary barrier to investment in information systems.
APPLIED SCIENCES-BASEL
(2021)
Article
Energy & Fuels
Abdallah Ghazal, Ida Karimfazli
Summary: The study examines the injection of viscoplastic fluid into a vertical channel filled with lower density Newtonian fluid to prevent buoyancy-driven failure in the plug placement process. By exploring a wide range of Peclet numbers, the research identifies two dominant flow regimes: diffusive and advective. The formation of a density-stratified layer of mixed fluids is found to be essential for the accumulation of the injected fluid.
JOURNAL OF PETROLEUM SCIENCE AND ENGINEERING
(2021)
Article
Energy & Fuels
Mohammadreza Kamali, Mahmoud Khalifeh, Elsayed Eid, Arild Saasen
Summary: In this experimental study, two different cementitious materials were examined for their hydraulic bond strength and shear bond strength. It was found that additives used in slurry preparation can affect the hydraulic sealability of the material, and rusty corroded steel provides better hydraulic sealability than clean machined steel for the same cementitious material. No correlation was found between the shear bond and hydraulic bond strength of different barrier materials, with geopolymer showing the lowest shear bond strength but the highest hydraulic sealability.
JOURNAL OF ENERGY RESOURCES TECHNOLOGY-TRANSACTIONS OF THE ASME
(2022)
Article
Energy & Fuels
Hassan Hamie, Anis Hoayek, Bassam El-Ghoul, Mahmoud Khalifeh
Summary: Geopolymers, as a potential alternative to Portland cement, have gained wider acceptance in the scientific world. Through laboratory experiments and statistical models, it is possible to anticipate the consistency of geopolymer mixtures, thereby reducing the number of trials and time required for experiments.
JOURNAL OF PETROLEUM SCIENCE AND ENGINEERING
(2022)
Article
Energy & Fuels
Karl Ronny Klungtvedt, Arild Saasen
Summary: Core flooding tests are not practical for screening and adjusting drilling fluid compositions due to limitations in time, cost, and access to representative samples. A simplified method for testing mass change of ceramic discs has been suggested as a cost-effective alternative for comparing different drilling fluids.
JOURNAL OF PETROLEUM SCIENCE AND ENGINEERING
(2022)
Article
Energy & Fuels
Yuxing Wu, Saeed Salehi, Mahmoud Khalifeh
Summary: Cement-mud displacement is crucial for the sealability of cement sheaths. This study used a 3D computational fluid dynamics model to investigate mud displacement in an irregular horizontal well. The results showed that residual mud mainly exists in the upper annulus of the enlarged section. Geopolymer has better sealing performance and can resist more water-based mud contamination.
JOURNAL OF NATURAL GAS SCIENCE AND ENGINEERING
(2022)
Article
Energy & Fuels
Karl Ronny Klungtvedt, Arild Saasen
Summary: Formation damage caused by invasion of drilling fluid particles and polymers into porous formations was assessed using a methodology. The study found that invasion of CaCO3 and polymers led to formation damage, and the presence of fibers limited the invasion. Higher applied pressures and larger pore-throat openings resulted in greater formation damage. The addition of fibers also reduced fluid loss and improved filter-cake permeability.
JOURNAL OF PETROLEUM SCIENCE AND ENGINEERING
(2022)
Article
Energy & Fuels
Camilo Pedrosa, Arild Saasen, Jan David Ytrehus
Summary: The formation of cuttings-beds is a crucial consideration during wellbore drilling operations, especially in highly deviated or horizontal wells. This study analyzes the bonding strength and stress required to break the formed bed of wetted cuttings using granular rheology methodology. The results show that the composition of the interstitial fluid significantly impacts the shear strength of the bed, with water-based drilling fluid exhibiting higher cohesion compared to oil-based drilling fluids.
GEOENERGY SCIENCE AND ENGINEERING
(2023)
Article
Multidisciplinary Sciences
Anis Hoayek, Mahmoud Khalifeh, Hassan Hamie, Bassam El-Ghoul, Rania Zogheib
Summary: In academia, geopolymers/alkali activated materials are gaining popularity as a substitute for Portland cement in the oil and gas industry. This study aims to address the lack of experimental data by using prediction models to accurately determine the pumpability of geopolymers. The results show that the Decision Tree model provides a simple and intuitive way to predict the behavior of geopolymers under different conditions.
Article
Energy & Fuels
Karl Ronny Klungtvedt, Jan Kristian Vasshus, Arild Saasen
Summary: Laboratory testing of lost circulation or loss prevention materials is typically conducted using permeable ceramic discs or sealing of slotted steel discs. The objective of this study was to design an experimental method for assessing the functionality of a drilling fluid to seal induced fractures in a porous formation, and to evaluate different fluid compositions using this method. Lower fluid loss was observed with oil-based fluids, but water-based fluids treated with loss prevention materials were more effective in sealing fractures.
GEOENERGY SCIENCE AND ENGINEERING
(2023)
Article
Energy & Fuels
Mohamed Omran, Sondre Hjelm, Mahmoud Khalifeh, Saeed Salehi
Summary: This work describes the synthesis of a new granite-based geopolymer mix design for well cementing applications. The early-age performance of the geopolymers was improved by modifying the chemical composition of the granite. Ground granulated blast-furnace slag (GGBFS) was used to optimize the mix design and enhance the fluid-state and solid-state properties. Pumpability, strength development, and mineralogy of the mixtures were studied. The use of GGBFS significantly reduces pumping time, increases density and consistency, and improves compressive strength.
GEOENERGY SCIENCE AND ENGINEERING
(2023)
Article
Energy & Fuels
Alondra Renteria, Pouya Khalili, Ian Frigaard, Mahmoud Khalifeh
Summary: The substitution of Ordinary Portland Cement (OPC) by geopolymer materials has the potential to reduce carbon footprint and provide more flexibility and durability in sealing oil and gas wells. However, geopolymer materials have chemical incompatibilities with commonly used drilling muds. This study presents a case study on designing compatible spacers for sealing wellbores with geopolymer, using 2D-gap averaged simulations to ensure minimal mud-geopolymer contamination and optimize displacement efficiency.
GEOENERGY SCIENCE AND ENGINEERING
(2023)
Article
Energy & Fuels
Karl Ronny Klungtvedt, Camilo Pedrosa, Arild Saasen
Summary: The filter-cake plays a critical role in reducing the wellbore permeability temporarily to prevent various issues. Its strength measurement is important for optimal drilling fluid design. By using a rheometer, the strength and flowability of filter-cakes were measured, and it was concluded that the addition of cellulose-based fibers can significantly increase the filter-cake strength.
GEOENERGY SCIENCE AND ENGINEERING
(2023)
Article
Energy & Fuels
Adijat A. Ogienagbon, Mahmoud Khalifeh
Summary: This study examines the hydraulic integrity of geopolymer as an alternative to cement in well cementing. The results show that geopolymer and Industrial expansive cement have higher hydraulic sealability compared to API class G cement. The study also reveals the influence of cement plug length on the hydraulic sealability of cementitious materials, highlighting the need for standards in laboratory-scale hydraulic sealability tests.
GEOENERGY SCIENCE AND ENGINEERING
(2023)
Article
Multidisciplinary Sciences
Fawzi Chamssine, Luiz H. S. Gasparotto, Miguel Angelo Fonsecade Souza, Mahmoud Khalifeh, Julio Cezar de Oliveira Freitas
Summary: Geopolymers show great potential as an alternative to Ordinary Portland Cement for oil-well cementing and well abandonment. Zinc ions have been found to prolong the setting time of geopolymers by impeding the initial stages of silicate oligomerization. DFT calculations and Raman spectroscopy confirmed the retardation effect of zinc ions.
SCIENTIFIC REPORTS
(2022)
Article
Engineering, Petroleum
Adijat Ogienagbon, Mahmoud Khalifeh
Summary: This study examined the mechanical properties of zonal isolation materials such as rock-based geopolymer, thermosetting resin, and industrial class expansive cement under realistic well conditions by triaxial testing. The findings show that temperature and confining pressure have a significant impact on the compressive strength of these materials, while the effect on other mechanical properties varies. Neat Class G and geopolymer exhibited a decrease in friction angle with increasing test temperature.
Article
Engineering, Petroleum
Mohammadreza Kamali, Mahmoud Khalifeh, Arild Saasen
Summary: In oil and gas and geothermal well construction, cementitious materials with durable chemical and mechanical properties and chemical compatibility with casing pipe are essential for zonal isolation and support of the casing. The stability of the casing-cement interface is crucial for long-term zonal isolation.