Method for determining reasonable gas injection pressure of liquid carbon dioxide phase change displacement coal seam
The invention discloses a method for determining reasonable pressure injection pressure of liquid carbon dioxide phase change displacement coal seam gas. The method specifically comprises the following steps: S1, carrying out an isothermal adsorption experiment on a target coal seam coal sample; s2,...
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| creator | CHENG XIAOJIAO FAN SHIXING QIAO JIJIE SHI YUKUN WU WEI YANAGI HIROTOSHI LI RIJUN SONG JINSUO LIU MINGYANG JIN FEIYANG |
| description | The invention discloses a method for determining reasonable pressure injection pressure of liquid carbon dioxide phase change displacement coal seam gas. The method specifically comprises the following steps: S1, carrying out an isothermal adsorption experiment on a target coal seam coal sample; s2, respectively calculating virtual saturated vapor pressure of CO2 and CH4 gas; s3, establishing a relationship between gas adsorption potential and gas adsorption equilibrium pressure; s4, the density of CO2 and the density of CH4 are calculated respectively; s5, respectively calculating adsorption spaces of CO2 and CH4 in the coal body; s6, establishing a relational expression between the adsorption potential and the adsorption space of the two gases; s7, reasonable replacement pressure is determined; s8, reasonable displacement pressure is determined; s9, calculating a CO2 seepage coefficient; s10, determining a reasonable seepage pressure; and S11, reasonable injection pressure is determined. The method provides |
| format | Patent |
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The method specifically comprises the following steps: S1, carrying out an isothermal adsorption experiment on a target coal seam coal sample; s2, respectively calculating virtual saturated vapor pressure of CO2 and CH4 gas; s3, establishing a relationship between gas adsorption potential and gas adsorption equilibrium pressure; s4, the density of CO2 and the density of CH4 are calculated respectively; s5, respectively calculating adsorption spaces of CO2 and CH4 in the coal body; s6, establishing a relational expression between the adsorption potential and the adsorption space of the two gases; s7, reasonable replacement pressure is determined; s8, reasonable displacement pressure is determined; s9, calculating a CO2 seepage coefficient; s10, determining a reasonable seepage pressure; and S11, reasonable injection pressure is determined. 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The method specifically comprises the following steps: S1, carrying out an isothermal adsorption experiment on a target coal seam coal sample; s2, respectively calculating virtual saturated vapor pressure of CO2 and CH4 gas; s3, establishing a relationship between gas adsorption potential and gas adsorption equilibrium pressure; s4, the density of CO2 and the density of CH4 are calculated respectively; s5, respectively calculating adsorption spaces of CO2 and CH4 in the coal body; s6, establishing a relational expression between the adsorption potential and the adsorption space of the two gases; s7, reasonable replacement pressure is determined; s8, reasonable displacement pressure is determined; s9, calculating a CO2 seepage coefficient; s10, determining a reasonable seepage pressure; and S11, reasonable injection pressure is determined. The method provides</abstract><oa>free_for_read</oa></addata></record> |
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| subjects | EARTH DRILLING EARTH DRILLING, e.g. DEEP DRILLING FIXED CONSTRUCTIONS INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIRCHEMICAL OR PHYSICAL PROPERTIES MEASURING MINING OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR ASLURRY OF MINERALS FROM WELLS PHYSICS TESTING |
| title | Method for determining reasonable gas injection pressure of liquid carbon dioxide phase change displacement coal seam |
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