Vladimir Karev – författare

The papers included describe studies on the dynamics of natural system – geosphere, hydrosphere, atmosphere—and their interactions, the human contribution to naturally occurring processes, laboratory modeling of earth and environment processes, and testing of new developed physical and mathematical models.

The book presents an integrated approach to studying the geomechanical processes occurring in oil and gas-bearing formations during their development. It discusses the choice of a model that takes into account the basic properties of rocks; experiments to find model parameters; numerical modeling; and direct physical modeling of deformation and filtration processes in reservoir and host rocks. Taking into account features of rock behavior, such as anisotropy of the mechanical properties of rocks during elastoplastic deformation; dependence of permeability on the total stress tensor; the contribution of the filtration flow to the formation stress state; and the influence of tangential as well as normal stresses on the transition to inelastic deformation, it demonstrates how the presented approach allows the practical problems of increasing the productivity of wells, oil recovery, and ensuring the stability of wellbores to be solved.The book is intended forspecialists, including geoengineers working in the oil and gas sector, teachers, graduate students and students, as well as all those interested in scientific and technological developments to meet the enormous demand for raw materials and energy.

The book presents an integrated approach to studying the geomechanical processes occurring in oil and gas-bearing formations during their development. It discusses the choice of a model that takes into account the basic properties of rocks; experiments to find model parameters; numerical modeling; and direct physical modeling of deformation and filtration processes in reservoir and host rocks. Taking into account features of rock behavior, such as anisotropy of the mechanical properties of rocks during elastoplastic deformation; dependence of permeability on the total stress tensor; the contribution of the filtration flow to the formation stress state; and the influence of tangential as well as normal stresses on the transition to inelastic deformation, it demonstrates how the presented approach allows the practical problems of increasing the productivity of wells, oil recovery, and ensuring the stability of wellbores to be solved.The book is intended forspecialists, including geoengineers working in the oil and gas sector, teachers, graduate students and students, as well as all those interested in scientific and technological developments to meet the enormous demand for raw materials and energy.

This book is devoted to the most important and urgent problems arising during the operation of underground gas storage facilities (UGS) and associated with the destruction of the reservoir and sand production into the wells.

This book is devoted to the most important and urgent problems arising during the operation of underground gas storage facilities (UGS) and associated with the destruction of the reservoir and sand production into the wells.

This book presents short papers of participants of the 9th International Scientific Conference-School for Young Scientists «Physical and Mathematical Modeling of Earth and Environment Processes. A special focus is given to the extraction of hydrocarbon resources, including from unconventional sources. An alternative to the use of hydrocarbons as a main source of energy on the Planet in the coming decades is unlikely to be found. At the same time, the resource base of hydrocarbons is quickly depleted, in particularly, large and accessible oil and gas fields. The shale oil and gas, Arctic hydrocarbon stocks, gas hydrates, coal bed methane, oil and gas from deep horizons can become new sources. "Deep oil" may be the most promising source of expanding the resource base of hydrocarbons according to many experts. New technologies are required to their development. Efficient low-cost technologies can be created on the basis of geomechanical approach, i.e., through the use of a huge elastic energy stored in the rock massif due to rock pressure.The creation of new breakthrough approaches to the development of hydrocarbon fields is very important in today's geopolitical conditions and requires the involvement of young minds and strength. International activities, including the youth scientific schools, can become an effective tool for exchange of information and the organizing of interdisciplinary research of processes in geo-environment. The book presents the new results of the experimental and theoretical modeling of deformation, fracture, and filtration processes in the rocks in connection to issues of creating scientific fundamentals for new hydrocarbon production technologies. The investigations of the dependence of well stability and permeability of rocks on the stress-strain state in conditions of deep horizons and high rock pressure are also represented.

This book presents short papers of participants of the 9th International Scientific Conference-School for Young Scientists «Physical and Mathematical Modeling of Earth and Environment Processes. A special focus is given to the extraction of hydrocarbon resources, including from unconventional sources. An alternative to the use of hydrocarbons as a main source of energy on the Planet in the coming decades is unlikely to be found. At the same time, the resource base of hydrocarbons is quickly depleted, in particularly, large and accessible oil and gas fields. The shale oil and gas, Arctic hydrocarbon stocks, gas hydrates, coal bed methane, oil and gas from deep horizons can become new sources. "Deep oil" may be the most promising source of expanding the resource base of hydrocarbons according to many experts. New technologies are required to their development. Efficient low-cost technologies can be created on the basis of geomechanical approach, i.e., through the use of a huge elastic energy stored in the rock massif due to rock pressure.The creation of new breakthrough approaches to the development of hydrocarbon fields is very important in today's geopolitical conditions and requires the involvement of young minds and strength. International activities, including the youth scientific schools, can become an effective tool for exchange of information and the organizing of interdisciplinary research of processes in geo-environment. The book presents the new results of the experimental and theoretical modeling of deformation, fracture, and filtration processes in the rocks in connection to issues of creating scientific fundamentals for new hydrocarbon production technologies. The investigations of the dependence of well stability and permeability of rocks on the stress-strain state in conditions of deep horizons and high rock pressure are also represented.

Systematic stream of high resolution laboratory data stimulates development of analytical and numerical models of the dynamical processes in three nature environments.A special focus is given to the extraction of hydrocarbon resources, including from unconventional sources.

This book presents short papers of participants of the 11th International Scientific Conference and School for Young Scientists on Physical and Mathematical Modeling of Earth and Environment Processes. The book includes theoretical and experimental studies of processes in the atmosphere, oceans, the lithosphere, and their interaction; environmental issues; problems of human impact on the environment; and methods of geophysical research.Research on the dynamics of natural systems—including the geosphere, hydrosphere, and atmosphere, as well as their interactions—alongside the human influence on natural processes, ranks among the most pressing and practically significant scientific challenges today. Advances in these fields have been driven by several key factors. The widespread adoption of computer technology has enabled the simulation and analysis of complex phenomena that were previously beyond reach. Meanwhile, the development and refinement of next-generation geophysical instruments and remote sensing systems—deployed on ships, aircraft, and satellites—have provided vast amounts of observational data, offering an objective representation of these processes.The studies compiled in this book also highlight the critical role of laboratory modeling in investigating geo-environmental processes and validating newly developed physical and mathematical models. Advances in measurement techniques, optical imaging, and other technologies have opened new possibilities for generating controlled, reproducible laboratory data, fostering the emergence of innovative ideas and concepts. The steady influx of high-resolution experimental data further stimulates the development of analytical and numerical models to better understand dynamic processes across Earth’s three major environmental systems.A special focus is given to the extraction of hydrocarbon resources, including from unconventional sources. The investigations of the dependence of well stability and permeability of rocks on the stress-strain state in conditions of deep horizons and high rock pressure are represented.

This book addresses the issues related to the operation of underground gas storage facilities (UGSF). A geomechanical approach has been developed to investigate the deformation processes in an UGSF reservoir during the cyclic gas injection and withdrawal. It has been established that the stress state of the reservoir as a whole, changing with cyclic changes in reservoir, has a significant impact on the mechanical processes in the bottom hole zone (BHZ).Calculations of the stresses occurring in BHZ have been carried out for both uniform and non-uniform natural stress fields. The orientation of horizontal wells relative to the principal axes of the original natural stress field has been considered.Physical modeling of deformation and filtration processes in BHZ of UGSF wells during gas injection and withdrawal has been conducted using a unique Triaxial Independent Loading Test System (TILTS). In these experiments, real three-dimensional stress states were created in the rock specimens arising in BHZ as result of change pressure in the well and reservoir pressure. A significant distinguishing feature of the developed geomechanical approach is the consideration of the dependence of reservoir rocks filtration characteristics on the stresses. This dependence is determined experimentally during physical modeling on the TILTS simulating real deformation processes in the UGSF wells during gas injection/withdrawal. A methodology has been developed to assess the possibility and method of enhancing the permeability of reservoir rocks by creating stresses of required type and level in the BHZ, particularly through the effective application of the DUR method.The results of experimental studies on the deformation and strength properties of reservoir rocks of specific UGSFs are presented. During experiments using the "hollow cylinder" scheme on specimens of weakly cemented sandstones, a non-typical strength anisotropy was discovered. This type of anisotropy can cause directed in two opposite directions breakouts on walls of well drilled in the reservoir with a uniform natural stress field. The potential manifestation of this discovered type of strength anisotropy in the rocks must be considered when designing and operating wells to prevent failure and sand production, as well as during the analysis of well measurements.The developed geomechanical approach and the physical and mathematical modeling of deformation and filtration processes in BHZ based on it allow for predictive recommendations to ensure the optimal operation of UGSFs, the stability of wellbores, maximum allowable pressure drawdowns, well flow rates, and the prevention of sand production at the studied UGSF.The book will be of interest to students, postgraduate students, scientists and specialists in the oil and gas industry.