Article
Engineering, Multidisciplinary
Mengtao Cao, Weiguo Liang, Shunde Yin, Maurice B. Dusseault
Summary: This study investigates the impacts of induced fracture reactivation during oil and gas production, using an extended finite element model to analyze different fracture slip scenarios and considering the effects of Young's modulus, crack orientation, and frictional coefficient on stress and displacement distribution. The results show that crack orientation significantly influences stress and displacement, especially near the crack, with slip only occurring in permitted directions determined by principal stresses and frictional coefficient. A larger frictional coefficient makes the crack less prone to shear slip.
CMES-COMPUTER MODELING IN ENGINEERING & SCIENCES
(2021)
Article
Energy & Fuels
Manouchehr Sanei, Omar Duran, Philippe R. B. Devloo, Erick S. R. Santos
Summary: Permeability is an important property in reservoir performance, numerical simulation, drilling, and production planning. Strain-dependent permeability is crucial for accurately assessing reservoir performance.
GEOMECHANICS AND GEOPHYSICS FOR GEO-ENERGY AND GEO-RESOURCES
(2022)
Article
Thermodynamics
Qi Gao, Songcai Han, Yuanfang Cheng, Xian Shi, Chuanliang Yan, Zhongying Han
Summary: Depleted shale reservoirs have the potential to serve as long-term geological storage sites for CO2. However, the complex heterogeneity of shale matrix poses challenges in understanding CO2 transport behavior. In this study, a flow-coupled-geomechanical model is developed to analyze CO2 transport at the microscale, considering the deformation and interactions of both organic matter (OM) and inorganic matter (iOM). The results show that heterogeneity in the shale matrix leads to regional differences in CO2 transport and shale matrix deformation behavior, emphasizing the importance of considering matrix heterogeneity.
Article
Energy & Fuels
Nikolaos Markou, Panos Papanastasiou
Summary: This study examines the impact of effective stresses in faulted reservoirs during depletion using finite element modeling. The stress path during depletion is mainly controlled by the initial lateral stress ratio, with plastic deformation affecting the region near the fault. Plastic deformation occurs for low LSR values while higher values tend to keep the system in the elastic region.
Article
Energy & Fuels
Ben Jahnke, Hiroki Sone, Hao Guo, Chris Sherman, Ian Warren, Corne Kreemer, Clifford H. Thurber, Kurt L. Feigl
Summary: The WHOLESCALE project seeks to simulate the stress distribution and evolution in the San Emidio geothermal system using a thermo-hydro-mechanical reservoir model. The stress state of the reservoir was inferred by analyzing the focal mechanisms of microseismic events during a geothermal power plant shutdown in 2016. This analysis was supplemented with geophysical and geological data, resulting in 78 different stress models with reasonable ranges for maximum compressive horizontal stress (SHmax) azimuth and ratios of principal stress magnitudes. Evaluation of slip tendencies suggests a transtensional stress state with an SHmax azimuth between N and N30 circle E.
Article
Engineering, Chemical
Yuyang Liu, Xiaowei Zhang, Wei Guo, Lixia Kang, Rongze Yu, Yuping Sun
Summary: Low-permeability reservoirs play a crucial role in the future growth of oil and gas reserves and production in China. This paper presents a method for predicting the effective stress field in ultralow-permeability reservoirs through reservoir-geomechanics coupling. By simulating and coupling the tectonic stress and pore pressure fields based on 3D geological models, the sigma(e) value in the reservoir can be predicted.
Article
Energy & Fuels
Yongming Yang, Xiao Li, Yang Ju
Summary: In this study, a 3D XFEM-based model was established to investigate the effects of plasticity and in situ HSD on hydraulic fracture propagation in deep unconventional oil and gas reservoir rocks. The results reveal the interaction mechanisms between plasticity and in situ HSD and provide theoretical guidance for implementing effective hydraulic fracturing technology.
GEOMECHANICS AND GEOPHYSICS FOR GEO-ENERGY AND GEO-RESOURCES
(2022)
Article
Multidisciplinary Sciences
Abhiram Kumar Verma, Debasis Deb, Akshay Chandan Dey, Subrata Roy, Ajay Kumar Singh, V. L. N. Avadhani, Rajiv Ranjan Tiwari
Summary: Efficient reservoir planning, development, and optimal exploitation require estimation of rock-mechanical, petrophysical properties, and pre-production stress state. This paper presents a comprehensive one-dimensional mechanical earth model (1D MEM) for the Mandapeta gas reservoir of Krishna Godavari (KG) basin in India, constructed through a detailed process including calibration of log data, estimation of pore pressure profiles, and evaluation of overburden and horizontal stresses. The resulting 1D MEM provides valuable insights for planning future wells, field development, and overcoming well challenges, and can also serve as a foundation for developing a 3D MEM of the reservoir.
SCIENTIFIC REPORTS
(2021)
Review
Computer Science, Interdisciplinary Applications
Yahia Alabbasi, Mohammed Hussein
Summary: Traditional ballasted tracks are widely used with ballast as the main material, contributing significantly to track alignment, stability, and sustainability. Understanding the mechanical behavior of railroad ballast is essential for better design and efficient maintenance. Two main approaches, large scale experimental and modeling, are used to understand ballast behavior.
ARCHIVES OF COMPUTATIONAL METHODS IN ENGINEERING
(2021)
Article
Engineering, Chemical
Hai Lin, Yakai Tian, Zhenwei Sun, Fujian Zhou
Summary: This study used the finite element method to simulate multiple fractures fracturing simultaneously and explained the effect of stress around the horizontal wellbore on new fractures during the refracturing of old wells using a temporary plugging technique. The results showed that reperforating fracturing can assist in increasing the effective stimulated reservoir volume and achieving high and stable production.
Article
Chemistry, Physical
Jerome A. Cuenca, Matthew D. Smith, Daniel E. Field, Fabien C-P Massabuau, Soumen Mandal, James Pomeroy, David J. Wallis, Rachel A. Oliver, Iain Thayne, Martin Kuball, Oliver A. Williams
Summary: The study investigates the thermal stresses induced by diamond directly deposited onto III-nitride (III-N) heterostructure membranes, using analytical methods, numerical models, and experimental validation. It is found that the thermal stresses are mainly caused by the mismatch in coefficient of thermal expansion (CTE), and can be reduced by pre-stressing the membrane.
Article
Environmental Sciences
Giovanni Bruno, Daniele Tupputi, Vincenzo Simeone
Summary: The city of Matera is undergoing urban regeneration and rediscovered a large underground space named Palombaro Lungo during the restoration of the main square. This underground reservoir was built by linking smaller pre-existing caves using a water-impermeable technique. The stability of the reservoir was evaluated using a geo-mechanical model and numerical simulations, which confirmed its stability and compatibility with the detected fractures.
ENVIRONMENTAL EARTH SCIENCES
(2023)
Article
Materials Science, Composites
Fulei Zhu, Dianlong Yu, Jia Tian, Yuanqi Cheng, Shufeng Zhang
Summary: A new and efficient FE model is developed to calculate stress redistribution after fiber breaking in unidirectional FRP. The stress concentration factor (SCF) of intact fibers around a broken fiber is investigated and found to heavily depend on the local fiber volume ratio (FVR). A modified analytical SCF model is proposed which takes into account the variation of local FVR and provides more accurate SCF values for FRP with poor fiber distribution uniformity.
POLYMER COMPOSITES
(2022)
Article
Geosciences, Multidisciplinary
J. Obradors-Prats, E. E. Calderon Medina, S. J. Jones, M. Rouainia, A. C. Aplin, A. J. L. Crook
Summary: The multi-well pressure data from the Magnolia Field in the Gulf of Mexico reveal high and varying overpressures between sand bodies, which is mainly caused by rapid deposition of mud-rich sediments and tectonic loading. A 2D forward hydro-mechanical evolutionary model shows that disequilibrium compaction accounts for most of the observed overpressure, while tectonic loading contributes to a smaller extent. The model also demonstrates that small variations in permeability and connectivity of mud-rich sections result in compartmentalised pressure distributions in adjacent sand bodies.
MARINE AND PETROLEUM GEOLOGY
(2023)
Article
Energy & Fuels
Mohammadreza Zare Reisabadi, Mohammad Sayyafzadeh, Manouchehr Haghighi
Summary: This study investigates the effects of matrix swelling and well trajectory on permeability in coal seam gas reservoirs during CO2 injection. The results show that vertical injection wells experience a significant decline in permeability due to swelling, while horizontal wells do not.
Review
Energy & Fuels
Raed H. Allawi, Mohammed S. Al-Jawad
Summary: This study used geomechanical modeling to determine a suitable mud weight window for drilling in the Zubair shale formation, with Mogi-Coulomb and modified Lade criteria identified as the most suitable for predicting wellbore instability. Inappropriate mud weight was found to be the main cause of instability issues, with the optimum mud weight range determined to be 11.5 to 14 ppg.
JOURNAL OF PETROLEUM EXPLORATION AND PRODUCTION TECHNOLOGY
(2021)
Article
Energy & Fuels
Ahmed N. Al-Dujaili, Mehdi Shabani, Mohammed S. AL-Jawad
Summary: This study examined rock types, pore characteristics, and flow units in the Mishrif Formation in the Southern Iraq's West Qurna oilfield. Various models were tested to determine the differences between Mishrif units in terms of classification, pore throat radius, and flow units, highlighting the significance of pore characteristics in reservoir evaluation. The study identified multiple flow units and variations in rock types and pore structures within the Mishrif units.
JOURNAL OF PETROLEUM EXPLORATION AND PRODUCTION TECHNOLOGY
(2021)
Article
Energy & Fuels
Dahlia A. Al-Obaidi, Watheq J. Al-Mudhafar, Mohammed S. Al-Jawad
Summary: The Gas-Assisted Gravity Drainage (GAGD) process is an effective method to improve oil production in reservoirs with water coning tendencies. This research investigates the feasibility and performance of the immiscible GAGD process compared to the Free Fall Gravity Drainage (FFGD) mechanism, and the results show that GAGD outperforms FFGD in terms of oil recovery. The strength of the aquifer impacts the gas breakthrough time and the GAGD process is more efficient in reservoirs without a bottom water drive.
Article
Energy & Fuels
Sarah Kamil Abdulredah, Mohammed Saleh Al-Jawad
Summary: This study developed a representative 3D static model to reduce the uncertainty of reservoir properties and volumetric estimates. It also revealed that the Mishrif reservoir in the Garraf oil field has a domal structure, with unit L1.2 having higher-quality properties.
PETROLEUM SCIENCE AND TECHNOLOGY
(2022)
Article
Chemistry, Multidisciplinary
Naeem Abdulsada Basheer, Ali Abdulkhabeer Ali, Raed H. Allawi, Abdulateef A. Mashaf
Summary: This study prepared a novel nanocomposite inhibitor and investigated its corrosion inhibition effect on carbon steel in an acidic medium. The prepared nanocomposite was diagnosed using various analytical techniques, and the highest inhibition efficiency was observed at a concentration of 100 ppm in an acidic medium.
Article
Energy & Fuels
Ahmed N. Al-Dujaili, Mehdi Shabani, Mohammed S. AL-Jawad
Summary: This study aims to build more accurate models by using lithofacies data. The results showed that the Sequential Gaussian indicator simulation algorithm provided a more accurate stochastic model, while the Truncated Gaussian simulation algorithm had a better match for the distribution percentage between lithofacies and electrofacies. The facies distribution was mainly South-North with an inclination to North-West.
PETROLEUM SCIENCE AND TECHNOLOGY
(2023)
Article
Energy & Fuels
Raed H. H. Allawi
Summary: This study aims to analyze the impact of drilling fluid chemicals on shale formation and develop optimum solutions for wellbore instability. Lab tests showed that the shale formation swelled significantly when potassium chloride was used with polymer mud. The mechanical earth model (MEM) indicated that using an equivalent mud weight of 11 ppg for vertical wells is necessary to stabilize the shale formations.
PETROLEUM SCIENCE AND TECHNOLOGY
(2023)
Article
Engineering, Geological
Raed H. Allawi, Watheq J. Al-Mudhafar, Mohammed S. Al-Jawad, Ahmed K. Abbas
Summary: A new semianalytical model was developed to estimate the isothermal rock compressibility in sandstone formations. The model was validated using laboratory test measurements and showed better matching compared to available empirical correlations.
INTERNATIONAL JOURNAL OF ROCK MECHANICS AND MINING SCIENCES
(2023)
Proceedings Paper
Engineering, Petroleum
Raed H. Allawi, Sahmi Eddwan Mohammed
Summary: This study uses artificial neural networks to predict cutting transport performance in deviated and horizontal wells. The results show that using hyperbolic tangent as an activation function in the input and output hidden layer is better for predicting CTR. Additionally, increasing the number of neurons has a positive effect on prediction accuracy. This study demonstrates the accuracy and effectiveness of the artificial neural network method in estimating cutting transport performance.
CONFERENCE PROCEEDINGS OF THE FIRST VIRTUAL CONFERENCE OF AL-AMARAH UNIVERSITY COLLEGE ON OIL AND GAS-2022, AUCOGC2022
(2023)