煤炭工程 ›› 2021, Vol. 53 ›› Issue (2): 90-94.doi: 10.11799/ce202102018

• 生产技术 • 上一篇    下一篇

煤矿井下水力压裂加骨料增透瓦斯抽采技术应用

陈建1,贾秉义2,董瑞刚3,孙四清4   

  1. 1. 淮南矿业集团
    2. 中煤科工集团西安研究院有限公司
    3. 淮南矿业集团潘三煤矿
    4. 中煤科工集团西安研究院
  • 收稿日期:2020-09-04 修回日期:2020-11-04 出版日期:2021-02-20 发布日期:2021-05-10
  • 通讯作者: 贾秉义 E-mail:jiabingyiccteg@126.com

Application of hydraulic fracturing and aggregate permeability increasing gas drainage technology in coal mine

  • Received:2020-09-04 Revised:2020-11-04 Online:2021-02-20 Published:2021-05-10

摘要: 针对煤矿井下作业空间小、作业环境差、设备能力有限、无法直接运用地面现有的水力压裂加骨料增透技术这一现状,利用工作面常用的乳化液泵、配合高压加骨料装置和高压气动控制阀门等,运用后置加砂压裂工艺在淮南矿区潘三煤矿进行了2个底板穿层钻孔的水力压裂加骨料增透现场试验。试验骨料选择为20~40目的超低密度聚合物,2个钻孔压裂段长分别为6.8m和6.1m,加注骨料量分别为110.25kg和176.5kg。施工完成后,对试验效果进行了考察,钻孔百孔瓦斯抽采纯量是常规未压裂钻孔的2~15倍,在骨料类型及规格相同的条件下,加大支撑剂比例,有助于提高压裂增透效果。

关键词: 煤矿井下, 水力压裂, 加骨料增透, 瓦斯抽采

Abstract: In view of the small working space, poor working environment and limited equipment capacity, the existing hydraulic fracturing and aggregate antireflection technology can not be directly used in the coal mine. The emulsion pump commonly used in the working face, combined with the high-pressure aggregate bin, high-pressure pneumatic control valve, etc., were used to carry out hydraulic fracturing of two floor through layer boreholes in Pansan Coal Mine, Huainan mining area Field test of adding aggregate to enhance the permeability. The test aggregate is 20~40 mesh ultra-low density polymer. The length of fracturing section of two boreholes is 6.8m and 6.1m, and the amount of injected aggregate is 110.25kg and 176.5kg respectively. After the completion of the construction, the test results were investigated. The pure gas drainage volume of 100 boreholes is 2-15 times of that of conventional unfractured boreholes. Under the same aggregate type and specification, increasing the proppant proportion is helpful to improve the fracturing permeability increasing effect.