煤矿井下防治水定向钻孔定点注浆封隔器设计与应用

doi:10.11799/ce202412001

Abstract

Abstract: In view of the problems existing in the ordinary orifice flange grouting technology used in the directional drilling construction of water prevention and control in underground coal mines, such as slurry easy to precipitate, small grouting amount, and full hole section being filled, resulting in unsatisfactory grouting effect and a large number of repeated footage. On the basis of coal mine grouting stopper segmented grouting and coal mine underground hydraulic segmented pressure technology. Combined with un-derground construction characteristics, designed an MX-100 bare-eye packer, it has the structural features of single channel double flow structure and long rubber drum design and easy to detangle protective sleeve design. The Working performance of packer was verified by indoor performance test, and studying the technology of fixed point grouting for underground coal mine，it have formed a set of packer grouting technology. The technology has been applied in the construction of no.1 directional drilling hole of floor limestone in the directional drilling field of the bottom floor roadway of 15150 working face in Xin'an Mine, the outlet point is located in the hole depth of 391 m and the specific yield is 44 m3/h, the packer was set at a hole depth of 280 m successfully, the setting pressure is 10 MPa, the grouting pressure reached the designed 8 MPa finally and the total grouting dry material was 514 t. The amount of grouting is obviously increased compared with similar directional drilling using hole grouting technology. At the same time, 280 m directional drilling repeat footage was reduced. The experimental results show that the packer can be set firmly in open hole drilling，the technology of packer fixed point grouting can realize near horizontal directional drilling hole segment fixed point grouting，it also reduced the unnecessary repetitive footage. It provides a better technical support for the realization of underground water prevention and control project in coal mine.

CLC Number:

TD745

References

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Design and application of packer for fixed point grouting of directional drilling for water control in coal mine

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