Obviously, the reservoir pressure, the cleat permeability and the isothermal absorption curve mostly affect the production.

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The effects of desorption time, permeability isothermal absorption curve shapes, pressure difference, oil and gas saturation on the degree of coalbed methane production are calculated and its producing mechanism is analyzed by simulation.

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Deformation greatly promoted carbonitride isothermal precipitation and made C-curve shift leftwards. The position and shape of C-curve depended on the content of Nb and N to a great extent, C-curve shifted leftwards a little when N content increased and its nose temperature was raised with Nb content increased. 3 when cooling rate increased, start temperature and finish temperature of continuous cooling precipitation decreased, full precipitation became difficult to take place, the volume fraction of carbonitride precipitation decreased, molar fraction of Nb and C dissolved in austenite increased, and the precipitation grain was further refined. Deformation shorten precipitation start time during continuous cooling, raised precipitation start temperature, accelerated precipitation kinetics of carbonitrides.

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isothermal parameter curve：等溫參數(shù)曲線

isothermal parameter 等溫參數(shù) | isothermal parameter curve 等溫參數(shù)曲線 | isothermal surface 等溫曲面

isothermal parameter：等溫參數(shù)

isotherm 等溫線 | isothermal parameter 等溫參數(shù) | isothermal parameter curve 等溫參數(shù)曲線

isothermal surface：等溫曲面

isothermal parameter curve 等溫參數(shù)曲線 | isothermal surface 等溫曲面 | isothermalasymptotic surface 等溫漸近曲面