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The Affect About Pore Characteristics of Coal to the Coal-bed Methane Desorption
Author: DuYuE
Tutor: MaDongMin
School: Xi'an University of Science and Technology
Course: Mineral prospecting and exploration
Keywords: CBM Pore ??structure Pore ??types Desorption
CLC: P618.11
Type: Master's thesis
Year: 2010
Downloads: 848
Quote: 5
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Abstract
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China's high gas rich coalbed methane resources. However, due to the complex geological conditions, the development of technology lags behind, theoretical research is imperfect, resulting in coalbed methane recovery rate is low, it is difficult to achieve the status of industrialized mining. To improve the efficiency of the exploitation of coalbed methane must be within the scope of the exploration and development of coal reservoir properties and coal bed methane desorption characteristics. The samples were collected coalbed methane exploration and development of active regions and mine exploration and development prospects of the region, covering taking into account China's major coal rank. Industrial analysis of the sample of maceral identification, porosity measurement, scanning electron microscopy experiments, mercury experiment, liquid nitrogen adsorption experiments and isothermal adsorption and desorption experiments on various types of experimental data classification process, a comprehensive analysis of a variety of experimental conclusion to reveal the relationship between the pore characteristics of coal and coalbed methane desorption, discover the basic theory of coalbed methane. Coal pore size distribution is very uneven, the porosity of the different ranks of coal; also different in different regions of the same metamorphic grade coal, the pore. Coal pores larger specific surface area, pore volume bigger. Coal rank, maceral, the specific surface area and pore structure of the coal is very different. The microporosity more, the larger the pore volume of the coal samples, the more favorable the adsorption of CBM reservoir. The higher the degree of metamorphism of coal, the greater the residual amount of CBM desorption process. When the pressure drops to 0.5 to 1 MPa between CBM desorption rate increase, nearly straight line mode. High rank coalbed methane reservoir when the pressure drops to between 10 MPa of coalbed methane desorption rate increases slowly; rapid increase when the pressure drops to between 0.5 to 2MPa CBM desorption rate. Low metamorphic grade CBM reservoirs, coal bed methane desorption rate showed different amplitude increases as the pressure decreases, but the biggest increase in the low-pressure stage. Buck mining practice of CBM, the need to safeguard the continued stability of the pressure drop, the pressure drop is too large, coal damage, impact on reservoir properties; pressure drop is too small, is not conducive to the coalbed methane desorption. The the coal pore throat characterized affect CBM desorption rate in the low pressure stage of the isothermal desorption experiments under the same conditions as in the composition and degree of coalification of the coal, uniform pore structure, centralized distribution of throat coal sample, coalbed methane desorption rate . Pores and holes of the coal samples mainly affect the amount of coalbed methane desorption and desorption rate. The coal reservoir closed micropores weaker, the higher the transmission efficiency of the differential pressure, then the amount of gas desorption and adsorption on the inner surface of the microporous desorption efficiency is higher. Coal sample pore characteristics of coalbed methane desorption, is the result of the impact of the three factors of the concentration distribution of pore size and its proportion of the pore throat, pore morphology. The output of the CBM process, voltage drop control and reservoir pore structure and pore types have a close relationship.
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CLC: > Astronomy,Earth Sciences > Geology > Of ore deposits > Deposit classification > Fuel deposits > Coal
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