低透气性煤层复合射孔技术提高瓦斯抽采率及研究-安全工程专业毕业论文.docx

摘 要
捅 要
随着煤矿开采规模的扩大和开采不断往深处延伸,不仅***含量增大而且煤层透气性降低。因此,如何增加煤层透气性以及提高***抽采率成为急需解决的问题。
本文以潞安集团常村矿23采区2i03工作面为工程实例,研究通过在石油天然气领域运用成熟的复合射孔技术移植到煤矿中来增加煤层的孔隙裂隙,从而提高煤层的透气性,最后达到提高***抽采量目的。为低透气性煤层提高***抽采率提供一种新技术、新思路。
结合复合射孔增透的作用机理,系统地介绍了复合射孔技术相关的基本理论以及射孔器的具体构造,分析了复合射孔技术在煤矿运用的可行性与安全性。论述了复合射孔技术的造缝机理以及射孔器在煤层中被引爆之后,爆轰冲击波、爆生气体、煤层***压力以及控制孔在射孔造缝过程中的作用和机理。
确定了射孔器的选型和安装方案,并且结合实际情况进行了参数优化设计, 。同时进行了现场试验,建立相应的打钻工艺、封孔工艺和施工安全措施。经过与正常抽采孔对比,***,,抽采半径较原来提高了1倍以上。经过效果分析证明了复合射孔技术应用于提高低透性煤层***抽采率的可用性和有效性。
图[37】表[9】参【58] 关键词:复合射孑L;***抽采;低透气性煤层;煤层增透分类号:TD713
万方数据
Abstract
Abstract
With the expansion of coal mining and the increase of mining depth,not only increasing gas content and permeability of coal ,how to increase coal seam permeability and improve the gas extraction rate e urgently needs to solve the problem.
engineering example,through the oil and gas field,with posite perforating technology transfer to the coal mines to increase the porosity of the coal seam cracks,SO as to improve the permeability of coal seam,improve pumping quantity of drainage to achieve low permeability of coal seam permeability is a kind of new technology,new train of thought.
bination with the mechanism of posite perforating anti—reflection, systematically introduces the related basic theory pound perforation technology and the
special structure of posite perforating technology in coal mine are analyzed using
the feasibility and the width generation mechanism of posite perforation technique and charge in the coal seam after the blast the detonation shock wave and detonation gas hole in coal seam,original gas pressure,and control the effect and mechanism of antireflection.
Determine the selection and installation scheme of perforating gun,bining with the parameters optimization design was carried out on the actual situation,selected the 89 figure of super deep ration perforation charge and 89DP25R10—100 perfor