The Experts below are selected from a list of 6231 Experts worldwide ranked by ideXlab platform
Jingchen Zhang - One of the best experts on this subject based on the ideXlab platform.
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numerical simulation of Hydraulic Fracturing coalbed methane reservoir with independent fracture grid
Fuel, 2015Co-Authors: Jingchen Zhang, Xiaobing BianAbstract:Abstract Hydraulic Fracturing stimulation technology is an effective method for increasing coalbed methane production, especially for coal seam with low permeability, low reservoir pressure and low gas saturation. Normally, fracture is simulated according to the law of equivalent percolation resistance, leading to the limit that fracture is several hundred times enlarged meanwhile the permeability is decreased, with wellbore located in the enlarged fracture, more fluids will produce through high conductive fracture path into wellbore. Based on theories and methods from oil–gas geology and mechanics of flow through porous media, this paper presents a two-phase, 3D flow and Hydraulic Fracturing Model of dual-porosity media. A finite difference numerical Model with independent fracture grid has been developed and applied successfully to a coalbed methane reservoir. Comparison results show that independent fracture grid is more effective than equivalent percolation resistance method in production fitting. Actual gas production data is consistent with results calculated by the new Model, while prediction from equivalent percolation resistance is higher.
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numerical simulation of Hydraulic Fracturing coalbed methane reservoir
Fuel, 2014Co-Authors: Jingchen ZhangAbstract:Abstract Some coal seam is well known for its three low characteristics: low permeability, low reservoir pressure and low gas saturation. Thus stimulation measures must be taken during coalbed methane development stage to enhance its recovery. Hydraulic Fracturing transformation technology is an effective method for increasing coalbed methane production. This paper presents a two-phase, 3D flow and Hydraulic Fracturing Model of dual-porosity media based on the theories of oil–gas geology and mechanics of flow through porous media. Correspondingly, a finite difference numerical Model has been developed and applied successfully to a coalbed methane reservoir. Well test data from one western China basin is utilized for simulation. Results show that Hydraulic Fracturing promotes desorption and diffusion of coalbed methane which in turn substantially increases production of coalbed methane.
Xiaobing Bian - One of the best experts on this subject based on the ideXlab platform.
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numerical simulation of Hydraulic Fracturing coalbed methane reservoir with independent fracture grid
Fuel, 2015Co-Authors: Jingchen Zhang, Xiaobing BianAbstract:Abstract Hydraulic Fracturing stimulation technology is an effective method for increasing coalbed methane production, especially for coal seam with low permeability, low reservoir pressure and low gas saturation. Normally, fracture is simulated according to the law of equivalent percolation resistance, leading to the limit that fracture is several hundred times enlarged meanwhile the permeability is decreased, with wellbore located in the enlarged fracture, more fluids will produce through high conductive fracture path into wellbore. Based on theories and methods from oil–gas geology and mechanics of flow through porous media, this paper presents a two-phase, 3D flow and Hydraulic Fracturing Model of dual-porosity media. A finite difference numerical Model with independent fracture grid has been developed and applied successfully to a coalbed methane reservoir. Comparison results show that independent fracture grid is more effective than equivalent percolation resistance method in production fitting. Actual gas production data is consistent with results calculated by the new Model, while prediction from equivalent percolation resistance is higher.
Joseph Sangil Kwon - One of the best experts on this subject based on the ideXlab platform.
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economic Model based controller design framework for Hydraulic Fracturing to optimize shale gas production and water usage
Industrial & Engineering Chemistry Research, 2019Co-Authors: Kaiyu Cao, Prashanth Siddhamshetty, Yuchan Ahn, Rajib Mukherjee, Joseph Sangil KwonAbstract:As water issues associated with Hydraulic Fracturing have received much attention, several optimization approaches have been developed for effective water management. However, most of them have not considered pumping schedules for Hydraulic Fracturing, which determine the productivity of a shale well as well as the total amount of freshwater required. Because of this, a novel Model-based control framework is proposed for Hydraulic Fracturing to maximize the net profit from shale gas development which simultaneously minimizes the total cost associated with water management. The framework is as follows: initially a reduced-order Model and a Kalman filter are developed based on the simulation data generated from a high-fidelity Hydraulic Fracturing Model to correlate the pumping schedule and the final fracture geometry. Then, a numerical reservoir simulator and mixed-integer nonlinear programming Model are used to generate two maps describing the revenue from selling shale gas produced and cost from managing...
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optimal pumping schedule design to achieve a uniform proppant concentration level in Hydraulic Fracturing
Computers & Chemical Engineering, 2017Co-Authors: Seeyub Yang, Prashanth Siddhamshetty, Joseph Sangil KwonAbstract:Abstract We present a novel design framework of an optimal and practical pumping schedule to achieve uniform proppant concentration across fracture at the end of pumping. By using the average viscosity to approximate concentration dependence of fracture propagation, a set of constant-concentration pumping schedules is applied to the developed dynamic Model, each of which is carefully chosen by taking into account the practical constraints such as the limit on the change of proppant concentration between pumping stages and the desired fracture geometry that has to be satisfied at the end of pumping for maximum productivity. Then, a practically-feasible target concentration profile is obtained via linear combinations of the generated spatial concentration profiles, and mass balance is applied to the practically-feasible target concentration to calculate the duration of each pumping stage. We apply the generated pumping schedule to the high-fidelity Hydraulic Fracturing Model, and the performance is compared with Nolte's pumping schedule.
Gang Liu - One of the best experts on this subject based on the ideXlab platform.
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modified zipper Fracturing in enhanced geothermal system reservoir and heat extraction optimization via orthogonal design
Renewable Energy, 2020Co-Authors: N M S Hassan, Yadan Wang, Gang LiuAbstract:Abstract Modified zipper Fracturing in horizontal wells is an effective tool for promoting the energy productivity of hot dry rock based enhanced geothermal system. However, the following two questions are not fully understood: 1) what extent of heat extraction from geothermal reservoir can be improved; 2) how to obtain the optimized fracture morphology meeting heat extraction requirements. We established a two-dimensional horizontal wells Hydraulic Fracturing Model to study the fracture propagation and effects of modified zipper Fracturing, and developed a length index to evaluate the impacts of fracture morphology on reservoir heat transfer behavior. The critical length, which is half of the interval between two horizontal wells, determines whether fracture propagation has effects on heat extraction or not. The orthogonal design is used to study the sensitivity of factors affecting Hydraulic Fracturing and heat extraction. Fracture spacing has insignificant influence on morphology, and therefore we set it as 30 m which is the optimal spacing. According to different formation parameters (in-situ stress difference and elastic modulus), controlling Fracturing fluid injection rate is the best choice to optimize fracture morphology. These research results would supply a guidance for designing Hydraulic fractures to meet the maximum heat extraction in enhanced geothermal system.
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hot dry rock hdr Hydraulic Fracturing propagation and impact factors assessment via sensitivity indicator
Renewable Energy, 2020Co-Authors: Yadan Wang, Gang LiuAbstract:Hot dry rock (HDR) is abundant of geothermal energy, without pollution or emissions, thus its mining methods have received extensive attention. Although the predecessors have discussed the law of initiation and propagation of Hydraulic cracks comparatively consummate, the sensitivity comparative analysis of parameters (displacement and viscosity of fluids, horizontal in-situ stress difference and elastic modulus of rock mass) is still not mentioned. A three-dimensional fluid-solid coupling Hydraulic Fracturing Model for vertical well is established to analyze the factors which affected crack extension. And a visual expression of the prominence of fracture morphology variation under the effect of factors mentioned above also be exposed. Through the analysis of sensitivity indicator, it is found that, if fracture morphology deform to a certain specific degree under the condition of only one variable parameters, the magnification of viscosity is far greater than the other three. The main crack of HDR is more sensitive to rock elastic modulus than horizontal in-situ stress difference. And the variation of fluid displacement have a greater impact of fracture morphology than viscosity. The results provide a scientific basis and a engineering guidance for the parameter optimization of vertical well Hydraulic Fracturing in enhanced geothermal system (EGS).
Yadan Wang - One of the best experts on this subject based on the ideXlab platform.
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modified zipper Fracturing in enhanced geothermal system reservoir and heat extraction optimization via orthogonal design
Renewable Energy, 2020Co-Authors: N M S Hassan, Yadan Wang, Gang LiuAbstract:Abstract Modified zipper Fracturing in horizontal wells is an effective tool for promoting the energy productivity of hot dry rock based enhanced geothermal system. However, the following two questions are not fully understood: 1) what extent of heat extraction from geothermal reservoir can be improved; 2) how to obtain the optimized fracture morphology meeting heat extraction requirements. We established a two-dimensional horizontal wells Hydraulic Fracturing Model to study the fracture propagation and effects of modified zipper Fracturing, and developed a length index to evaluate the impacts of fracture morphology on reservoir heat transfer behavior. The critical length, which is half of the interval between two horizontal wells, determines whether fracture propagation has effects on heat extraction or not. The orthogonal design is used to study the sensitivity of factors affecting Hydraulic Fracturing and heat extraction. Fracture spacing has insignificant influence on morphology, and therefore we set it as 30 m which is the optimal spacing. According to different formation parameters (in-situ stress difference and elastic modulus), controlling Fracturing fluid injection rate is the best choice to optimize fracture morphology. These research results would supply a guidance for designing Hydraulic fractures to meet the maximum heat extraction in enhanced geothermal system.
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hot dry rock hdr Hydraulic Fracturing propagation and impact factors assessment via sensitivity indicator
Renewable Energy, 2020Co-Authors: Yadan Wang, Gang LiuAbstract:Hot dry rock (HDR) is abundant of geothermal energy, without pollution or emissions, thus its mining methods have received extensive attention. Although the predecessors have discussed the law of initiation and propagation of Hydraulic cracks comparatively consummate, the sensitivity comparative analysis of parameters (displacement and viscosity of fluids, horizontal in-situ stress difference and elastic modulus of rock mass) is still not mentioned. A three-dimensional fluid-solid coupling Hydraulic Fracturing Model for vertical well is established to analyze the factors which affected crack extension. And a visual expression of the prominence of fracture morphology variation under the effect of factors mentioned above also be exposed. Through the analysis of sensitivity indicator, it is found that, if fracture morphology deform to a certain specific degree under the condition of only one variable parameters, the magnification of viscosity is far greater than the other three. The main crack of HDR is more sensitive to rock elastic modulus than horizontal in-situ stress difference. And the variation of fluid displacement have a greater impact of fracture morphology than viscosity. The results provide a scientific basis and a engineering guidance for the parameter optimization of vertical well Hydraulic Fracturing in enhanced geothermal system (EGS).
