冷冻取心过程中煤心倒吸现象的探究

范道鹏; 王兆丰; 邢医

冷冻取心过程中煤心倒吸现象的探究

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- 发布日期: 2022-08-19

Study on coal core back suction phenomenon in the process of freezing coring

摘要

摘要: 为了研究测定煤层瓦斯含量中冷冻取心技术出现的倒吸现象，通过自主研发的含瓦斯冷冻响应装置进行试验分析，开展了不同瓦斯压力（1、2、3、4 MPa）与不同变质程度（长焰煤、焦煤、贫瘦煤、无烟煤）条件下的冷冻取心过程中出现倒吸现象的试验。研究结果表明：在同等条件下，随着煤心瓦斯压力的增高其煤心倒吸量逐渐减少，煤心低瓦斯压力（1、2 MPa）的倒吸量远远大于高瓦斯压力（3、4 MPa）的倒吸量，倒吸速度随着煤心温度的降低呈现逐渐减小的趋势，倒吸持续时间随着瓦斯压力的增大而逐渐减小；变质程度对煤心倒吸的影响趋势一致，呈现出变质程度越高煤心出现倒吸现象的时间越长，且煤心倒吸量越大，倒吸持续时间也随着变质程度增高而变长，倒吸速度随着煤心温度降低而减小。
- 瓦斯含量测定 /
- 冷冻取心 /
- 煤心温度 /
- 倒吸量 /
- 瓦斯压力
Abstract: In order to study the back suction phenomenon of the freezing core technology in the determination of coal seam gas content, the self-developed gas-containing freezing response device was tested and analyzed. We carried out experiments on the back suction phenomenon during freezing and coring under different gas pressures（1 MPa, 2 MPa, 3 MPa, 4 MPa） and different degrees of metamorphism（long flame coal, coking coal, lean coal, anthracite）. The results showed that under the same conditions, with the increase of coal core gas pressure, the back suction volume of coal core gradually decreases. The back suction volume of coal core with low gas pressure（1 MPa, 2 MPa） is far greater than that of high gas pressure（3 MPa, 4 MPa）. The suction speed gradually decreases with the decrease of coal core temperature, and the suction duration gradually decreases with the increase of gas pressure. The influence trend of metamorphic degree on coal core suction is the same, showing that the higher the metamorphic degree, the longer the time of coal core suction phenomenon, and the greater the amount of coal core back suction, the longer the duration of suction with the increase of metamorphic degree, and the lower the speed of suction with the decrease of coal core temperature.
- gas content determination /
- freezing coring /
- coal core temperature /
- back suction capacity /
- gas pressure

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参考文献(15)

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