马堡矿水力压裂增透技术及其应用研究

发布时间：2018-02-27 18:25

本文关键词： 水力压裂卸压增透 RFPA~(2D)-Flow 瓦斯浓度瓦斯流量　出处：《辽宁工程技术大学》2015年硕士论文　论文类型：学位论文

【摘要】：本文主要采用理论分析,数值模拟以及现场实践相结合的方法对马堡矿水力压裂卸压增透技术进行研究。通过力学相关理论对裂隙的形成,扩展和延伸进行了分析,根据马堡矿实际地质情况以及煤岩的力学参数,应用RFPA2D—Flow数值模拟软件对水力压裂过程进行模拟,最后通过现场试验对马堡矿15#煤层15108工作面进行水力压裂增透技术措施。在现场应用中发现,瓦斯抽采浓度和流量显著提高,提高了煤层的透气性,确定了适合马堡矿的水力压裂影响半径,具体研究内容如下：首先,采用相关力学理论对原岩应力,裂隙的类型,高压水对裂隙的致裂机理以及裂隙的延伸和扩展机理进行分析,重点对注水前钻孔围岩应力与渗透率变化关系以及注入高压水后钻孔的应力分布和钻孔周围的应力变化进行分析。其次,根据马堡矿的实际地质特征以及煤岩物理力学参数建立模型,并用RFPA2D— Flow对水力压裂过程进行数值模拟,重点对煤体剪应力场,声发射场以及水压在钻孔围岩的分布规律进行模拟,并分析了高压水对煤体的破坏过程,以及裂隙的扩展过程。最后,对水力压裂增透技术在马堡矿15108工作面进行现场试验,分别对水力压裂增透技术实施前后的浓度和流量进行监测。通过比较发现：增透后的煤层瓦斯抽采浓度和流量都有了很大程度的提高,大大提高了煤层的透气性。通过压裂前后含水率以及压裂区和非压裂区瓦斯浓度和流量对比,充分说明水力压裂增透技术的有效性及可行性,是增大高瓦斯低透气性煤层透气性,提高瓦斯抽采效果的重要举措。
[Abstract]:In this paper, theoretical analysis, numerical simulation and field practice are used to study hydraulic fracturing and antireflection technology in Mabao Mine, and the formation, expansion and extension of fractures are analyzed through mechanics theory. According to the actual geological conditions and the mechanical parameters of coal and rock, the hydraulic fracturing process is simulated by RFPA2D-Flow numerical simulation software. In the end, hydraulic fracturing and antipenetration measures are carried out on 15108 face of No. 15# coal seam in Mabu Coal Mine. In the field application, it is found that the concentration and discharge of gas drainage are significantly increased, and the permeability of coal seam is improved. The influence radius of hydraulic fracturing is determined. The specific research contents are as follows: firstly, the relevant mechanics theory is used to analyze the stress and fracture types of the original rock. The mechanism of crack fracture and the mechanism of crack extension and extension are analyzed by high pressure water. The stress distribution of the borehole and the stress change around the borehole after injection of high pressure water are analyzed. According to the actual geological characteristics and the physical and mechanical parameters of coal and rock, the model is established, and the hydraulic fracturing process is numerically simulated by RFPA 2D-Flow, with emphasis on the shear stress field of coal body. The distribution law of acoustic emission site and water pressure in the surrounding rock of borehole is simulated, and the process of destruction of coal body by high pressure water and the process of crack expansion are analyzed. Finally, the field test of hydraulic fracturing antireflection technology is carried out in 15108 face of Mabu Coal Mine. The concentration and flow rate before and after the implementation of hydraulic fracturing antipermeation technology are monitored respectively. Through comparison, it is found that the concentration and flow rate of coal seam gas drainage have been increased to a great extent, The permeability of coal seam is greatly improved. By comparing water cut, gas concentration and flow rate between fracturing area and non-fracturing area, the effectiveness and feasibility of hydraulic fracturing antipermeability technology are fully demonstrated. It is an important measure to increase the permeability of high gas and low permeability coal seam and to improve the effect of gas drainage.
【学位授予单位】：辽宁工程技术大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TD712.6

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