Study on the Explosion Suppression Effect of N2and CO2on CH4/C2H6/C3H8Mixtures at High Temperature and High Pressure
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摘要:油田伴生气经常会发生燃爆事故，为提升采油过程的安全性，需研究N 2与CO 2在井筒高温高压条件下的抑爆效果. 目前对于高温高压条件下固定可燃气体积分数，不同体积分数N 2和CO 2对爆炸特性影响的研究较少. 对40 °C，初始压力0.5、1.0、2.0 MPa，不同N 2和CO 2体积分数下CH 4/C 2H 6/C 3H 8混合气到达最大爆炸超压的时间、最大爆炸超压和爆燃指数 K G进行了相关研究，分析了不同初始压力和2种惰性气体对爆炸特性参数的影响. 试验结果表明：不同初始压力下N 2和CO 2各自的惰化机理相同；CO 2的惰化效果优于N 2且存在最优点，该点之前CO 2的惰化效果与N 2相比优势逐渐增强，由化学作用占主导地位，该点之后化学作用已达到最大效果，因此CO 2的惰化效果虽仍强于N 2，优势却逐渐减小.Abstract:In order to improve the safety of oil production, the explosion suppression effect of N 2and CO 2under the condition of high temperature and high pressure in the wellbore needs to be studied. At present, there are few studies on the effect of different volume fractions of N 2and CO 2on the explosion characteristics of a fixed ratio of combustible gas to oxygen under high temperature and high pressure conditions. At 40 °C, the initial pressure of 0.5, 1.0 and 2.0 MPa, the time for CH 4/C 2H 6/C 3H 8mixture to reach the maximum explosion overpressure, the maximum explosion overpressure and the deflagration index K Gunder different N 2and CO 2volume fractions were studied and analyzed. The effects of different initial pressures and two types of inert gases on the explosion characteristic parameters were investigated. The test results show that the inerting mechanisms of N 2and CO 2are the same under different initial pressures; the inerting effect of CO 2is better than that of N 2and has the optimal point. Before this point, the inerting effect of CO 2is gradually stronger than that of N 2, and the chemical effect is dominant, after this point the chemical action reaches its maximum effect, so the inerting effect of CO 2is still stronger than that of N 2, but the advantage is gradually reduced.
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图 2可燃气体爆炸特性试验装置实物图
Figure 2.Physical map of the experimental device for the explosive characteristics of combustible gases
图 340 °C、0.5 MPa及不同N2体积分数下爆炸超压随时间的变化
Figure 3.Variation curve of explosion overpressure with time at 40 °C, 0.5 MPa and different N2volume fraction
图 440 °C、1.0 MPa及不同N2体积分数下爆炸超压随时间的变化
Figure 4.Variation curve of explosion overpressure with time at 40 °C, 1.0 MPa and different N2volume fraction
图 540 °C、2.0 MPa及不同N2体积分数下爆炸超压随时间的变化
Figure 5.Variation curve of explosion overpressure with time at 40 °C，2.0 MPa and different N2volume fraction
图 640 °C、0.5 MPa及不同CO2体积分数下爆炸超压随时间的变化
Figure 6.Variation curve of explosion overpressure with time at 40 °C, 0.5 MPa and different CO2volume fraction
图 740 °C、1.0 MPa及不同CO2体积分数下爆炸超压随时间的变化
Figure 7.Variation curve of explosion overpressure with time at 40 °C, 1.0 MPa and different CO2volume fraction
图 840 °C、2.0 MPa及不同CO2体积分数下爆炸超压随时间的变化
Figure 8.Variation curve of explosion overpressure with time at 40 °C, 2.0 MPa and different CO2volume fraction
图 940 °C时，不同惰性气体体积分数下的最大爆炸超压
Figure 9.Maximum explosion overpressure with different inert gas volume fraction and temperture of 40 °C
图 1040 °C时，不同惰性气体体积分数下的爆燃指数KG
Figure 10.Deflagration indexKGwith different inert gas volume fraction and temperture of 40 °C
表 1不同惰性气体体积分数下的KG值
Table 1.KGvalue at different inert gas volume fraction
惰性气体体积分数/% KG/( MPa·dm·s−1) 0.5 MPa, CO2 0.5 MPa, N2 1.0 MPa, CO2 1.0 MPa, N2 2.0 MPa, CO2 2.0 MPa, N2 0 60.16 60.16 132.13 132.13 262.35 262.35 10 51.89 61.68 102.21 86.44 124.94 161.98 20 13.26 34.43 19.98 64.91 35.66 111.28 30 4.10 14.58 1.56 27.41 23.73 49.07 40 0.87 1.02 8.39 2.82 10.03 
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