An openable and closable drill bit for a double-wall drilling tool and its construction method
An open-close, drilling tool technology, applied in drill bits, drilling equipment, earth-moving drilling, etc., can solve the problems of increasing rock samples or core blocking, long overall time, long auxiliary time, etc., to reduce auxiliary time, replace Convenient and easy-to-use effects
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Embodiment 1
[0046] This embodiment provides an openable and closable drill bit for a double-wall drilling tool, such as figure 1 As shown, it includes a double-wall drill bit body 1 , an upper end cover 2 installed at one end of the double-wall drill bit body 1 , and a movable blade 3 located between the double-wall drill bit body 1 and the upper end cover 2 .
[0047] like figure 2 and image 3 As shown, the upper end cover 2 is provided with a plurality of blade wings 201 in the circumferential direction, and the blade wings 201 are provided with a plurality of cutting teeth 202; the upper end cover 2 includes an end cover surface 203 and an end cover side wall 204, and the end cover surface 203 is provided with There are two through holes 205 on the end cover surface, and the center of the end cover surface 203 is provided with an end cover center hole 206 .
[0048] like Figure 4-Figure 6 As shown, the double-wall drill bit body 1 includes a coaxial inner tube 101 and an outer tu...
Embodiment 2
[0061] The present embodiment provides a method for realizing forward and reverse circulation with a double-wall drilling tool with an openable and closable drill bit, including:
[0062] Reverse circulation construction steps: After the double-wall drilling tool is installed with an openable and closable drill bit, it is connected to the double-wall drill pipe, the inner pipe is connected to the inner pipe of the double-wall drill pipe, and the fluid enters the annulus through the double-wall drill pipe and is connected to the double-wall drill pipe. Enter the first cavity along the first through hole, and push the movable blade to open until the arc edge of the movable blade is tangential to the inner contour of the installation groove and brake, at this time, the movable blade is fully opened, and the fluid is ejected through the through hole of the end cover surface. And shunted to the central channel for reverse circulation drilling construction;
[0063] Positive circula...
Embodiment 3
[0065] The present embodiment provides a construction method for lowering a gas drainage pipe using an openable and closable drill bit for a double-wall drilling tool. At the bottom of the hole, perform the reverse circulation construction steps to return the rubber ball in the central channel. After the rubber ball returns, stop supplying fluid, and run a gas drainage pipe of a specific size from the tail of the double-wall drilling tool at the orifice to the bottom of the hole. The upper part of the movable blade of the drill bit can be opened and closed for a certain distance. At this time, the reverse circulation construction steps are performed again to make the movable blade continue to open, and the gas drainage pipe continues to be run down to the bottom of the hole. The fluid supply is stopped again, and the drilling tool in the hole is pulled out to remove the gas. The drainage pipe remains in the hole, and the gas drainage pipe is completed.
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