Horizontally butted well hydraulic scour migration pressure relief outburst elimination gas extraction method
A technology for docking wells and horizontal wells, applied in the field of gas outburst elimination and coalbed methane extraction, can solve problems such as failure to achieve expected results, and achieve the effects of shortening construction period, increasing extraction efficiency, and increasing permeability
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[0022] The present invention will be further described below in conjunction with an embodiment (accompanying drawing):
[0023] like figure 1 , figure 2 , image 3 , Figure 4 As shown in the figure, the specific implementation steps of the hydraulic scouring migration method of the horizontal butt well of the present invention are as follows:
[0024] (1) Drill a vertical well 8 at a predetermined position. The well is drilled from the ground 1 to the bottom of the target coal seam 2. The casing is completed above the coal seam roof, and the open hole is completed below the coal seam roof.
[0025] (2) The horizontal well 3 and the vertical well 8 are connected to each other, the casing is fixed in the vertical well 8 and the deflection section 4, and the screen pipe 15 is laid down in the horizontal section 5 to ensure the smooth connection of the connecting section and prevent clogging. The screen hole 14 should be large to reduce the fluid resistance.
[0026] (3) La...
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