注气压力对不同注源气体置驱效应的影响

发布时间：2019-04-15 23:22

【摘要】：注气压力是煤层注气促排瓦斯工程技术的关键技术参数。为了研究注气压力对不同注源气体置驱煤中CH_4效应的影响,采用含瓦斯颗粒煤垂直应力载荷条件下向实验室注气模拟试验方法,开展1.25 MPa垂直载荷条件下无烟煤注入He、N_2和CO_2等气体置驱煤中CH_4的模拟试验。结果表明:在突破时间内注源气体全部滞留在煤层内;超过突破时间后,注源气体逐步从出口流出,其滞留率逐渐减小,最终只显现驱替作用。注源气体的突破时间随注气压力的增加而减少,随注源气体吸附性由强到弱而减少。置驱率由置换作用和驱替作用及其配比关系共同决定,其与注源气体吸附性强弱没有明显的关系,且注气压力越高置驱效率越高。
[Abstract]:Gas injection pressure is the key technical parameter of gas injection technology in coal seam. In order to study the influence of gas injection pressure on CH_4 effect in coal displacement with different gas injection sources, a gas injection simulation test method for laboratory under vertical stress load of gas-bearing granular coal was adopted. The simulation test of injection of anthracite into CH_4 in He,N_2 and CO_2 gas flooding coals under 1.25 MPa vertical load was carried out. The results show that all the injected source gases remain in the coal seam during the breakthrough time, and after the breakthrough time, the injection source gases gradually flow out from the outlet, the retention rate decreases gradually, and the displacement effect is only shown in the end. The breakthrough time of the source gas decreases with the increase of the gas injection pressure and decreases with the adsorption of the source gas from strong to weak. The displacement rate is determined by displacement, displacement and its ratio. There is no obvious relationship between the displacement rate and the adsorption of the source gas, and the higher the injection pressure is, the higher the displacement efficiency is.
【作者单位】：河南理工大学安全科学与工程学院;煤矿灾害预防与抢险救灾教育部工程研究中心;
【基金】：国家自然科学基金资助(51174081) 河南省高校科技创新团队支持计划(17IRTSTHN030) 教育部创新团队发展支持计划(IRT_16R22)
【分类号】：TD712

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