Design and application of fixed point grouting packer for directional drilling for underground water control
In view of the problems in ordinary orifice flange grouting technology used in the directional drilling construction for water prevention and control in underground coal mines,such as slurry easy precipitation,small grouting amount,and full hole section grouting,it results in unsatisfactory grouting effect and a large number of repeated footage.On the basis of segment grouting with stopper and underground hydraulic segment pressure technology,combined with underground construction characteristics,we design an MX-100 unaided eye packer which is designed with single channel double flow structure,long rubber drum and protection for easy disen-gagement.The Working performance of packer is verified by in-lab test.We also studied the technology of un-derground fixed point grouting with packer,which forms a set of packer grouting technology.The technology is applied in No.1 directional drilling hole of floor limestone at the bottom of No.15150 working face in Xin'an Mine.The outlet point is located at 391 m depth and the specific yield is 44 m3/h.The packer is set at 280 m depth successfully,with setting pressure of 10 MPa.The final grouting pressure reached the rated 8 MPa and the total grouting dry material is 514 t.The amount of grouting is obviously increased compared with similar directional drilling with orifice grouting technology.At the same time,280 m directional drilling repeat footage is reduced accordingly.The experimental results show that the packer can be set firmly in open hole drilling,which realizes near horizontal directional drilling hole segment fixed point grouting and also reduced unnecessary repetitive advancement.It provides a better technical support for the realization of underground water prevention and control for coal mines.
underground coal minewater controldirectional boreholefixed point groutingpacker
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