Directional fracturing device and method for underground drilling
A directional fracturing and fracturing technology, which is applied in the field of mine rock formation pressure, can solve problems such as non-adjustable, prone to deviation of pressure valve direction, and unobservable pressure valve position, so as to improve the accuracy of fracturing, improve the scope of application, and apply wide range of effects
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Embodiment 1
[0072] Such as figure 1 As shown, when drilling 1 fan-shaped directional fracturing in the bottom plate of the coal seam 14 underground in a coal mine, the fracturing target area 17 is first determined according to the gas content, gas pressure, in-situ stress and mining impact of the coal seam 14 . According to the fracturing target area 17, select a suitable roadway that is closer to the target area, and construct a fracturing drilling site in Xiangbang, place the kilometer drilling rig, drill pipe, casing 2, and fracturing pipe 3 near the working area, and complete Preparations before fracturing.
[0073] The fracturing goal of this embodiment is to release the pressure and extract the target area through floor fracturing, so it is required that the fracturing fractures can develop to the target area, and at the same time be distributed fan-shaped throughout the entire fracturing target area 17 . Therefore, it is determined that this construction is fan-shaped directional ...
Embodiment 2
[0078] Such as figure 2 As shown, when performing linear directional fracturing in the coal seam 14 borehole 1 underground in a coal mine, the fracturing target area 17 is firstly determined according to the gas content, gas pressure, in-situ stress and mining impact of the coal seam 14 . Then, according to the fracturing target area 17, select the bottom pumping roadway or the excavation drilling site closest to the target area to arrange the workbench, place the tunnel drilling rig, drill pipe, casing 2, and fracturing pipe 3 near the working area, and complete the fracturing construction preparatory work.
[0079] The fracturing goal of this embodiment is to perform linear directional fracturing on the coal seam 14 to relieve pressure and increase permeability, so the cracks are required to develop along the coal seam 14 as much as possible. Therefore, it is determined that cross directional fracturing is selected for this construction. According to the needs of the cros...
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