低透煤层水力压裂促进瓦斯抽采模拟与试验研究

发布时间：2018-03-18 01:33

本文选题：低透气性煤层　切入点：水力压裂　出处：《中国安全科学学报》2017年10期 　论文类型：期刊论文

【摘要】：针对低透气性煤层瓦斯抽采难度大、工作量大、效率低等问题,采用水力压裂技术促进煤层瓦斯抽采。在多场耦合和弹性损伤理论基础上,建立煤层损伤-应力-渗流耦合模型,数值模拟马堡煤矿15108工作面水力压裂及瓦斯抽采过程,分析煤层弹性模量、渗透率和瓦斯压力的变化规律,确定压裂和抽采关键参数,并据此开展工程试验,对模拟结果进行验证。结果表明:高能压裂液能使煤层破裂,渗透率急剧升高,加快瓦斯向抽采钻孔运移;随着压裂时间增加,压裂损伤范围逐渐扩大;模拟得出水力压裂10 000 s时,2个压裂孔间的损伤区在抽采孔处贯通,压裂损伤范围达14 m;现场压裂试验后,瓦斯抽采平均和最高纯量分别达到63.79和126.57 m3/d,是未压裂的9.65倍和7.23倍,透气性升高了67倍。
[Abstract]:In view of the problems of high difficulty, heavy workload and low efficiency in gas extraction in low permeability coal seam, hydraulic fracturing technology is used to promote gas drainage in coal seam, based on the theory of multiple field coupling and elastic damage. The coupling model of damage, stress and seepage in coal seam is established to simulate the hydraulic fracturing and gas extraction process in 15108 face of Mabu Coal Mine. The variation of elastic modulus, permeability and gas pressure of coal seam is analyzed, and the key parameters of fracturing and drainage are determined. The results show that the high energy fracturing fluid can make the coal seam fracture, the permeability increase sharply, and accelerate the migration of gas to the drainage borehole, and the damage range of fracturing gradually expands with the increase of fracturing time. The simulation results show that when hydraulic fracturing is 10 000 s, the damage zone between two fracturing holes is through at the pumping hole, and the fracturing damage range is 14 m. After field fracturing test, the average and the highest scalar amount of gas extraction are 63.79 and 126.57 m3 / d, respectively, which are 9.65 times and 7.23 times as much as those without fracturing, respectively. Air permeability increased 67 times.
【作者单位】：辽宁工程技术大学安全科学与工程学院;辽宁工程技术大学矿业学院;
【基金】：国家自然科学基金资助(51274115)
【分类号】：TD712.6

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