水力冲孔卸压增透物理模拟试验及效果评价
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TD713+.34

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国家科技重大专项项目(2016ZX05044);河南省创新型科技人才队伍建设工程(164100510024);国家自然科学基金重点项目(51434003)。


Effect evaluation on pressure relief and permeability improvement of hydraulic flushing physical experiment
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    摘要:

    水力冲孔技术是应用最广泛的卸压增透措施之一,在松软低透气性煤层取得较好效果。利用自主研发的水力冲孔试验装置开展了水力冲孔试验研究,同时在水力冲孔前后分别进行一次瓦斯抽采试验,基于瓦斯抽采情况评价水力冲孔增透效果。研究结果表明:同一位置的气体压力在水力冲孔后下降更快,靠近冲孔位置的区域受影响较大,而远处区域受影响较小,且增透效果在抽采一段时间后才会显现;为了定量评价水力冲孔的增透效果,基于瓦斯压力定义并推导了等效抽采半径和有效抽采时间两个参数,通过计算得出:通过水力冲孔技术,等效抽采半径增加至原来的1.7倍,而有效抽采时间降低为原来的56%,说明水力冲孔能有效增大煤层透气性,并提高抽采效率。同时发现水力冲孔后气体压力梯度较小,说明水力冲孔是通过促进冲孔附近煤层孔裂隙发育进而降低瓦斯运移阻力从而实现增透效果,因此如何持续、高效地提高煤层孔裂隙发育是水力冲孔技术的关键所在。

    Abstract:

    Hydraulic flushing technology is one of the most widely used pressure relief and permeability improvement measures and it works well in soft and low permeability coal seams. The physical simulation of hydraulic flushing was determined based on self-developed hydraulic flushing test system, and two CBM drainage tests were conducted before and after hydraulic flushing in order to evaluate its pressure relief and permeability improvement. Equivalent drainage radius and effective drainage time were defined to evaluate the hydraulic flushing technology quantitatively. As a conclusion, the equivalent drainage radius increased to 1.7 times and the effective drainage time reduced to 56% after hydraulic flushing. The results indicate that hydraulic flushing can improve permeability of coal seam and drainage efficiency greatly by increasing the porosity and fissure of coal seam. Therefore, the key of hydraulic flushing technology is how to improve the porosity and fissure of coal seam effectively and stablely.

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陶云奇,张超林,许江,彭守建,冯丹.水力冲孔卸压增透物理模拟试验及效果评价[J].重庆大学学报,2018,41(10):69-77.

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  • 收稿日期:2018-05-01
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  • 在线发布日期: 2018-10-22
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