Experimental study on CO2-enhanced coalbed methane production and its simultaneous storage
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摘要:
长期以来针对CO2-ECBM已做了大量研究工作，然而有限的工业试验没能达到预期目的，使得这一煤层气强化技术推广应用欠缺。近些年随着各国碳中和路线的制定，CO2封存逐渐受到重视，煤储层可否作为CO2的封存空间、可否实现CO2驱替CH4和封存同步进行，又重新回归人们的视野。为此，以新疆准南区块目标煤层样为研究对象，采用不同CO2与CH4混合比例气体进行煤的吸附/解吸实验，探索混合气体比例对CO2-ECBM和CO2吸附封存潜力的影响。结果表明，随着混合气体CO2比例减少，CH4驱替效果降低，其中40%CH4+60%CO2混合气体的CO2残余量最多，在解吸至0.7 MPa时已有83.05%的CH4产出，而83.62%的CO2吸附残余在煤中，表明其CO2吸附封存潜力最佳。根据道尔顿分压分体积理论和Langmuir方程，对降压解吸阶段各混合气体解吸量与解吸率进行理论计算，结果显示，随混合气体CO2含量减少，煤中CO2的残余率、残余量以及CH4最终解吸率均降低。理论计算与实验中CH4解吸率和CO2残余量随混合气体组成变化趋势基本一致，表明混合气体中CO2占比越高，越有利于最大限度地提升CH4采收率以及煤储层CO2吸附封存潜力。研究认识为CO2-ECBM和煤储层CO2封存现场应用提供理论依据，为这一技术的推广应用提供实验支撑。
Abstract:Abstract: Experimental study on CO2-enhanced coalbed methane production and its simultaneous storage Abstract: For a long time, a lot of work has been done on CO2-enhanced coalbed methane (CO2-ECBM), but the limited industrial trials failed to achieve the expected purpose, which prevented the promotion and application of CBM enhancement technology. In recent years, with the establishment of carbon neutrality routes in different countries, CO2 geological storage has gradually gained attention, and the questions of whether coal reservoirs can be treated as CO2 storage space and whether simultaneous CO2 displacing CH4 and storage can be achieved have returned to the spotlight. In this study, using the coal samples from Xinjiang Zhunnan coal region, the adsorption/desorption experiments of coal were carried out with different mixture ratios of CO2 and CH4 to explore the effects of gas composition on CO2-ECBM, as well as CO2 adsorptive storage potential. The results show that, the CH4 displacement effect decreases as the CO2 ratio of the mixed gas decreasing, among which the CO2 residual volume of 40% CH4+60% CO2 mixture is the highest, corresponding to 83.05% CH4 production and 83.62% CO2 storage by adsorption as the experimental pressure drops to 0.7 MPa during desorption processes. This indicates that its CO2 adsorptive storage potential is the best. The desorption volume and rate of each mixed gas during different depressurization and desorption stages were calculated according to the Dalton’s law for partial pressure and partial volume, as well as the Langmuir’s equation. The results indicate that, as the CO2 ratio of the mixed gas decreases, the CO2 residual rate and volume, as well as the final CH4 desorption rate, were decrease. The predicted trends of CH4 desorption rate and CO2 residual volume with gas mixture composition are generally consistent with those obtained by the experiments, indicating that high proportion of CO2 in the gas mixture enhances CH4 recovery, as well as CO2 adsorptive storage potential of the coal reservoir. This study can provide not only theoretical basis for the field application of CO2-ECBM and CO2 storage, but also experimental supports for the promotion of this technology.
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Keywords:
- coalbed methane /
- CO2-ECBM /
- CO2 displacing CH4 /
- CO2 synchronous storage /
- adsorption/desorption
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图 2 新疆准南煤样CH4和CO2等温吸附曲线与吸附势曲线
Fig. 2 Isothermal adsorption curves and adsorption characteristics curves of CH4 and CO2 from Zhunnan coal samples in Xinjiang
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图 3 不同比例混合气体解吸气体中CH4与CO2体积分数变化趋势
Fig. 3 Changing trends in the concentration of CH4 and CO2 in the desorbed gas at different gas mixture ratios
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图 4 不同比例混合气体煤中CH4与CO2解吸率变化趋势
Fig. 4 Changing trends in the desorption rates of CH4 and CO2 from coal at different gas mixture ratios
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图 5 CH4和CO2解吸率理论计算结果
Fig. 5 Theoretical calculation results of CH4 and CO2 desorption rates
表 1 新疆煤样工业分析和元素分析结果
Table 1 Industrial analysis and elemental analysis results of coal samples in Xinjiang
样品来源
工业分析w/%
元素分析w/%镜质体最大反射率Rmax/% Mad Aad Vad FCad C H N (O+S) 新疆准南区块 1.82 2.83 38.08 57.27 79.71 4.77 1.03 14.49 0.67 
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表 2 不同比例混合气体吸附解吸实验数据
Table 2 Data for adsorption and desorption experiments on mixed gases
气体成分配比 平衡压力
段/MPaCH4解吸
体积分数/%CO2解吸
体积分数/%CH4分压/
MPaCO2分压/
MPaCH4解吸
率/%CO2解吸
率/%CH4解吸
量/mLCO2解吸
量/mL30%CH4+70%CO2 4.50~4.00 65.71 34.29 2.63 1.37 12.97 3.15 97.25 50.75 4.00~3.50 67.02 32.98 2.35 1.15 22.53 05.35 71.71 35.29 3.50~3.00 67.31 32.69 2.02 0.98 37.61 08.76 113.08 54.92 3.00~2.50 69.51 30.49 1.74 0.76 51.04 11.51 100.79 44.21 2.50~2.00 62.02 37.98 1.24 0.76 60.72 14.27 72.56 44.44 2.00~1.50 53.35 46.65 0.80 0.70 73.10 19.31 92.83 81.17 1.50~1.00 50.20 49.80 0.50 0.50 84.61 24.64 86.34 85.66 1.00~0.70 41.50 58.50 0.29 0.41 88.98 27.51 32.79 46.22 0.70~0.20 31.94 68.06 0.06 0.14 96.73 35.21 58.13 123.87 0.20~0 18.99 81.01 0 0 98.86 39.44 15.95 68.05 40%CH4+60%CO2 5.50~5.00 68.94 31.06 3.45 1.55 11.92 3.90 166.83 75.17 5.00~4.50 75.25 24.75 3.39 1.11 19.87 5.81 111.37 36.63 4.50~4.00 79.27 20.73 3.17 0.83 25.70 6.92 81.65 21.35 4.00~3.50 80.37 19.63 2.81 0.69 32.42 8.11 94.03 22.97 3.50~3.00 81.22 18.78 2.44 0.56 39.09 9.23 93.40 21.60 3.00~2.50 83.19 16.81 2.08 0.42 46.04 10.25 97.33 19.67 2.50~2.00 83.23 16.77 1.66 0.34 55.08 11.58 126.51 25.49 2.00~1.50 81.91 18.09 1.23 0.27 64.62 13.11 133.51 29.49 1.50~1.00 81.47 18.53 0.81 0.19 73.52 14.58 124.65 28.35 1.00~0.70 79.41 20.59 0.56 0.14 83.05 16.38 133.41 34.59 0.70~0.20 67.66 32.34 0.14 0.06 97.11 21.27 196.89 94.11 0.20~0 22.75 77.25 0 0 98.24 24.04 15.70 53.30 50%CH4+50%CO2 4.70~3.90 65.47 34.53 2.55 1.35 20.53 12.07 225.87 119.13 3.90~3.50 70.48 29.52 2.47 1.03 28.03 15.57 82.46 34.54 3.50~3.00 71.32 28.68 2.14 0.86 35.10 18.74 77.74 31.26 3.00~2.50 71.61 28.39 1.79 0.71 46.56 23.80 126.03 49.97 2.50~2.00 72.79 27.21 1.46 0.54 54.43 27.08 86.62 32.38 2.00~1.50 79.76 20.24 1.20 0.30 64.36 29.89 109.27 27.73 1.50~1.00 83.55 16.45 0.84 0.16 74.01 32.01 106.11 20.89 1.00~0.60 74.77 25.23 0.45 0.15 84.27 35.87 112.90 38.10 0.60~0.20 60.17 39.83 0.12 0.08 94.45 43.37 111.92 74.08 0.20~0 21.97 78.03 0 0 96.60 51.91 23.73 84.27 60%CH4+40%CO2 7.70~7.00 83.96 16.04 5.88 1.12 11.27 3.23 135.27 25.84 7.00~6.50 81.58 18.42 5.30 1.20 18.35 5.63 84.92 19.17 6.50~6.00 79.66 20.34 4.78 1.22 24.34 7.92 71.92 18.36 6.00~5.50 81.26 18.74 4.47 1.03 30.70 10.12 76.32 17.60 5.50~5.00 80.64 19.36 4.03 0.97 37.03 12.40 75.93 18.23 5.00~4.50 80.41 19.59 3.62 0.88 43.13 14.63 73.18 17.83 4.50~4.00 80.07 19.93 3.20 0.80 49.47 17.00 76.08 18.94 4.00~3.50 79.56 20.44 2.78 0.72 56.02 19.52 78.60 20.19 3.50~3.00 78.90 21.10 2.37 0.63 61.50 21.72 65.77 17.59 3.00~2.50 77.70 22.30 1.94 0.56 67.61 24.35 73.28 21.03 2.50~2.00 76.29 23.71 1.53 0.47 73.57 27.13 71.52 22.23 2.00~1.50 74.64 25.36 1.12 0.38 79.45 30.13 70.59 23.98 1.50~1.00 72.02 27.98 0.72 0.28 85.13 33.43 68.14 26.47 1.00~0.70 66.58 33.42 0.47 0.23 90.37 37.38 62.91 31.58 0.70~0.40 54.11 45.89 0.22 0.18 94.79 43.00 53.03 44.97 0.40~0.20 35.01 64.99 0.07 0.13 96.83 48.69 24.51 45.49 0.20~0 17.00 83.00 0 0 97.61 54.37 9.32 45.48 70%CH4+30%CO2 7.00~6.30 93.62 6.38 5.90 0.40 8.43 1.34 59.04 4.02 6.30~5.50 93.68 6.32 5.15 0.35 19.86 3.14 80.00 5.40 5.50~5.00 92.00 8.00 4.60 0.40 25.00 4.18 35.96 3.13 5.00~4.50 93.29 6.71 4.20 0.30 31.00 5.19 42.02 3.02 4.50~4.00 93.48 6.52 3.74 0.26 36.20 6.04 36.38 2.54 4.00~3.50 93.18 6.82 3.26 0.24 42.44 7.10 43.69 3.20 3.50~3.00 89.12 10.88 2.67 0.33 47.56 8.56 35.81 4.37 3.00~2.50 92.61 7.39 2.32 0.18 53.87 9.73 44.18 3.53 2.50~2.00 91.15 8.85 1.82 0.18 59.07 10.91 36.42 3.50 2.00~1.60 91.69 8.31 1.40 0.13 66.98 12.58 55.32 5.01 1.60~1.20 90.48 9.52 1.09 0.10 72.98 14.06 42.03 4.42 1.20~0.90 88.47 11.53 0.80 0.10 78.26 15.66 36.97 4.82 0.90~0.60 83.43 16.57 0.50 0.10 84.56 18.58 44.08 8.75 0.60~0.20 74.86 25.14 0.15 0.05 89.80 22.69 36.68 12.32 0.20~0 58.74 41.26 0 0 92.27 26.73 17.27 12.13
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