Hydraulic permeation increasing process for large-dip-angle low-permeability coal seam

[0045] The hydraulic permeation enhancement technology of large dip angle and low permeability coal seam includes the following steps:

[0046] Step (1), drilling, drilling in the coal seam to form a fracturing hole 1;

[0047] Step (2), determine the hole sealing process, two packers 3 are placed in each fracturing hole 1, the two packers 3 are distributed at intervals, and multiple branches connected to the fracturing hole 1 are opened on one side of the fracturing hole 1 Hole 5, the intersection point between branch hole 5 and fracturing hole 1 is a branch point, fracturing tube 2 is inserted into fracturing hole 1, and the screen section of fracturing tube 2 is put into the position of branch hole 5 to be fractured;

[0048] Such as figure 1As shown, the front end of the fracturing tube 2 is provided with guide shoes, which can ensure the smooth lowering of the fracturing tube 2 into the fracturing hole 1. In this embodiment, two branch holes 5 are opened on one side of t...

[0078] Such as figure 2 As shown, the packer 3 in this embodiment includes an upper joint 6, a lower joint 11, a central pipe 10 and a rubber cartridge 8. The upper joint 6 of the packer 3 is connected to the fracturing pipe 2, and the two ends of the central pipe 10 are respectively It is connected with the upper joint 6 and the lower joint 11. In this embodiment, the two ends of the central pipe 10 are integrally formed with the upper joint 6 and the lower joint 11 respectively, and the rubber sleeve 8 is set on the outside of the central pipe 10.

[0079] The central tube 10 in this embodiment is provided with a liquid inlet hole 9, and the liquid inlet hole 9 is a through hole. combine image 3 As shown, the rubber cylinder 8 includes an inner rubber cylinder 802 and an outer rubber cylinder 801. In this embodiment, an inner cavity is provided on the rubber cylinder 8, thereby forming a structure of the inner rubber cylinder 802 and the outer rubber cylinder 801. In this...