Download or read book A Fully Coupled Finite Element Model of Coal Deformation and Two Phase Flow for Coalbed Methane Extraction written by Dong Chen and published by . This book was released on 2012 with total page 151 pages. Available in PDF, EPUB and Kindle. Book excerpt: A reservoir simulation model is usually required to represent the combined effects of gas transport, water flow, and coal swelling/shrinking on the extraction of coalbed methane (CBM). Although a number of models have been developed in recent years, most of them are based on coal permeability models under the assumptions of uniaxial strain and constant overburden load. Under these assumptions, coal permeability is defined as a function of pore pressure only. This allows the gas transport and water flow to be decoupled from coal deformation. In this study, these two assumptions are relaxed: a general porosity and effective permeability model is developed to represent the behavior of both the primary medium (coal matrix) and the secondary medium (fractures) under conditions of variable stress. The effective permeability model is defined as a function of effective stress, and can be applied to the full spectrum of mechanical conditions spanning prescribed in-situ stresses through constrained displacement. Moreover the effect of matrix moisture is often ignored in previous simulation studies, but some experimental results showed that the presence of moisture in the coal matrix had profound influences on the gas storage and transport in coal seams by reducing the gas adsorption capacity of the coal, decreasing the gas effective diffusivity through the coal matrix, and varying the coal swelling strain. In order to investigate the magnitude and interplay the moisture effects on CBM production, approximate relationships have been built to quantify the moisture effect on the gas adsorption capacity, the gas effective diffusivity and the coal swelling strain. These relationships have been calibrated by comparison with a selection of literature data. Both the permeability model and the moisture effect correlations are implemented into a fully coupled model of coal deformation, gas transport in the matrix system, and gas-water flow in the fracture system. The FE model has been verified through the history matching of the gas and water production profiles in the Powder River Basin. The verified FE model is applied to conduct a series of parametric studies. These parametric studies illustrate important non-linear responses due to the effective stress that cannot be recovered where mechanical influences are not rigorously coupled with the two-phase flow system.
Download or read book Two phase Flow in Coalbeds written by Fred N. Kissell and published by . This book was released on 1975 with total page 424 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Coal Mechanics written by Yuanping Cheng and published by Springer Nature. This book was released on 2021-08-17 with total page 535 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book focuses on the mechanical properties and permeability of coal, and the gas flow in coal seams. Based on coal permeability models, it establishes different models for coal seam gas, from the linear flow model to the gas–solid coupling flow model. It also provides the theoretical basis for the exploitation and safe production of coal as well as coal seam gas resources. As such, it is a valuable reference for researchers, advanced students and practitioners working in mining engineering and coalbed methane engineering.
Download or read book Computational Mechanics written by Zhenhan Yao and published by 清华大学出版社有限公司. This book was released on 2004 with total page 712 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Advances in Theoretical and Computational Energy Optimization Processes written by Ferdinando Salata and published by MDPI. This book was released on 2020-12-29 with total page 422 pages. Available in PDF, EPUB and Kindle. Book excerpt: The paradigm in the design of all human activity that requires energy for its development must change from the past. We must change the processes of product manufacturing and functional services. This is necessary in order to mitigate the ecological footprint of man on the Earth, which cannot be considered as a resource with infinite capacities. To do this, every single process must be analyzed and modified, with the aim of decarbonising each production sector. This collection of articles has been assembled to provide ideas and new broad-spectrum contributions for these purposes.
Download or read book The Journal of Canadian Petroleum Technology written by and published by . This book was released on 2005 with total page 452 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Developing and Calibrating a Numerical Model for Microbially Enhanced Coal bed Methane Production written by Simon Emmert and published by . This book was released on 2021 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Mathematical Modeling and Simulation written by Kai Velten and published by John Wiley & Sons. This book was released on 2009-06-01 with total page 362 pages. Available in PDF, EPUB and Kindle. Book excerpt: This concise and clear introduction to the topic requires only basic knowledge of calculus and linear algebra - all other concepts and ideas are developed in the course of the book. Lucidly written so as to appeal to undergraduates and practitioners alike, it enables readers to set up simple mathematical models on their own and to interpret their results and those of others critically. To achieve this, many examples have been chosen from various fields, such as biology, ecology, economics, medicine, agricultural, chemical, electrical, mechanical and process engineering, which are subsequently discussed in detail. Based on the author`s modeling and simulation experience in science and engineering and as a consultant, the book answers such basic questions as: What is a mathematical model? What types of models do exist? Which model is appropriate for a particular problem? What are simulation, parameter estimation, and validation? The book relies exclusively upon open-source software which is available to everybody free of charge. The entire book software - including 3D CFD and structural mechanics simulation software - can be used based on a free CAELinux-Live-DVD that is available in the Internet (works on most machines and operating systems).
Download or read book Sustainable Natural Gas Reservoir and Production Engineering written by David Wood and published by Gulf Professional Publishing. This book was released on 2021-10-30 with total page 412 pages. Available in PDF, EPUB and Kindle. Book excerpt: Sustainable Natural Gas Reservoir and Production Engineering, the latest release in The Fundamentals and Sustainable Advances in Natural Gas Science and Engineering series, delivers many of the scientific fundamentals needed in the natural gas industry, including improving gas recovery, simulation processes for fracturing methods, and methods for optimizing production strategies. Advanced research covered includes machine learning applications, gas fracturing mechanics aimed at reducing environmental impact, and enhanced oil recovery technologies aimed at capturing carbon dioxide. Supported by corporate and academic contributors along with two well-distinguished editors, this book provides today’s natural gas engineers the fundamentals and advances in a convenient resource Helps readers advance from basic equations used in conventional gas reservoirs Presents structured case studies to illustrate how new principles can be applied in practical situations Covers advanced topics, including machine learning applications to optimize predictions, controls and improve knowledge-based applications Helps accelerate emission reductions by teaching gas fracturing mechanics with an aim of reducing environmental impacts and developing enhanced oil recovery technologies that capture carbon dioxide
Download or read book Methane Modeling written by and published by . This book was released on 1981 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Salient features of technical progress for the first quarter are the following: (I) computer-assisted literature searches have been completed for several strategies designed to cover different aspects of the model development and evaluation program. Some strategy refinement and additional searches are required. Ultimately a comprehensive bibliography will have been compiled and evaluated; (II) basic mathematical components that are sufficient for the development of a first numerical model for water and methane flows to coal mines have been identified. This initial set of components is a basis for the collection and analysis of refinements to provide more realistic accounts of the complex factors affecting coal-bed methane during mining and degasification; (III) a set of basic partial differential equations for flow of water and gas in a horizontal, homogeneous coal seam has been formulated in terms of pressure, pore saturation, and adsorbed gas variables and presented in normalized form for numerical solution. Equation sets corresponding to alternative choices of dependent variables will be formulated and compared with this initial set and (IV) computer subroutines have been modified and assembled to implement one-dimensional, nonsteady, two-phase flow models. These programs implement numerical, finite-difference, method-of-lines algorithms in a format that facilitates substitution of mathematical components and equation sets. Initial runs with this software package have illustrated the superiority of a particular space-discretization scheme and provide data for comparison of grid and permeability weighting schemes.
Download or read book Fully Coupled Finite Element Model to Study Multiple Hydraulic Fracturing in Heterogeneous Tight Formations written by Ruizhi Zhong and published by . This book was released on 2014 with total page 54 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Petroleum Abstracts written by and published by . This book was released on 1991 with total page 1512 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Gas 2018 written by International Energy Agency and published by Market Report Series: Gas. This book was released on 2018-06-30 with total page 153 pages. Available in PDF, EPUB and Kindle. Book excerpt: The gas industry's future remains bright. Three major shifts will shape the evolution of global natural gas markets in the next five years - growing imports from China, greater industrial demand, and rising production from the United States. The structural shift will determine the evolution of the market at a time when growth in emerging markets is sustained by strong economic expansion and strong policy support to curb air pollution. Industry becomes a major player in gas markets, while the United States cements its position as a top producer and exporter thanks to its shale revolution. Gas 2018, the latest IEA annual market report, assesses these trends and provides a detailed analysis of supply and trade developments, infrastructure investments, and demand-growth forecast through 2023. The report analyses the main changes that will likely transform the natural gas market, including market reforms that shape supply and demand patterns in key Asian economies and developments in the LNG market - the main driver of interregional natural gas trade growth.
Download or read book Constraining Surface Deformation Preditions Resulting from Coal Seam Gas Extraction written by N. Brown and published by . This book was released on 2014 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: "This Record describes techniques which can be used to predict surface deformation caused by natural or anthropogenic subsurface fluid changes. Using predictive (forward) models, simulations have been developed to estimate the range of surface deformation caused by the Coal Seam Gas (CSG) extraction operations in the Surat Basin. The objectives of this research were to: - Develop a predictive model that enables Geoscience Australia to estimate the magnitude and areal extent of surface deformation caused by natural or anthropogenic fluid activities. - Report the capability, accuracy and limitations of the predictive model. - Apply the predictive model to Coal Seam Gas operations in the Surat Basin, Queensland. - Describe the monitoring techniques capable of measuring subsurface fluid changes - Discuss how geodetic data can be used to constrain the poroelastic properties of reservoirs". -- Online abstract.
Download or read book A Two dimensional Two phase Simulation Model for Coalbed Methane Recovery written by Jyun-Cheng Chen and published by . This book was released on 1987 with total page 268 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Fluid Transport Behaviors of Intact Coal and Coal Measure Rocks written by Long Fan and published by . This book was released on 2019 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Coal gas extraction consists of coalbed methane (CBM) recovery from surface drilling boreholes and coal mine methane (CMM) extraction via both surface and subsurface ventholes in conjunction with mining operations. The permeability of a certain fluid in coal reservoirs and its stress response corresponding to dynamic pressure are critical for both effective gas drainage from coal and CBM extractions. For both CMM and CBM applications, the dimensions of fluid flow pathways can range from tens of centimeters to several micrometers, even nanometers. The transport behaviors of fluids in multiscale flow pathways are expected to be dramatically different. Permeability evolution and fluid transportation behaviors in multiscale flow pathways are dominant factors in achieving the successful gas extraction in coal reservoirs. This dissertation focuses on the transport behaviors in multiscale pathways and their applications in CBM and CMM production. For CMM application, a conceptual model of broken rock mass compaction was proposed in this study, based on elastic theory, by simplifying the compression process and assuming the connection between broken rocks is a similar cubic mass without a large void space. Compacted rock mass permeability evolution was modeled based on the cubic law of porosity and permeability. The predicted permeability evolution by a coupled model is similar with reported experimental results. Compared to intact rock mass, we found that the stress-strain curve of compacted rock mass takes a longer stress-strain path to reach the linearity due to void space compaction resulting from friction slipping and re-arrangement of the grains. In addition, the permeability variation under the overburden cyclic loading-unloading process was experimentally investigated in the lab. An average permeability damage concept with a complete loading-unloading cycle was introduced to quantify the effects of maximum stress, loading path, holding time period, and gas type on permeability evolution. It was demonstrated that the permeability hysteresis occurred during the cyclic loading-unloading, and that the average permeability damage was subject to the loading-unloading paths. The average permeability damage for the coal specimen was more sensitive to maximum loading stress and the loading-unloading path compared to gas injection pore pressure and the holding period. For CBM production, the sorption induced swelling/shrinkage effect was numerically simulated based on a gas-solid coupling model incorporated with swelling effect to evaluate the horizontal stress relaxation under uniaxial strain conditions during depletion. Unlike the elastic strain, the sorption-induced strain showed a non-linear behavior with continuous sorbing gas injections, and these two types of strains were engaged in a competitive process of volumetric change for the coal. It was found that the simulated results of volumetric change under the hydrostatic condition well agreed with experimental data. To better understand frictional sliding behavior and permeability evolution in well-cleated coal, sliding friction measurements were conducted using artificially generated coal fractures. Various fluids (helium, carbon dioxide, water, and moisturized methane) were injected into coal to investigate the dynamic characteristics of friction coefficients and permeability evolution during faulting. Unlike the traditional view of stress-based fault reactivation, our results demonstrated that the initial sliding reactivation stress on the coal was not only pressure dependent but also fluid-type dependent.
Download or read book Coalbed Methane written by Rudy E. Rogers and published by . This book was released on 2007-01-01 with total page 504 pages. Available in PDF, EPUB and Kindle. Book excerpt:
