Openable and closable drill bit for double-wall drilling tool and 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 jams, high uncertainty, and overall time-consuming, reducing auxiliary time, Simple operation and convenient replacement effect
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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 body 1 , an upper end cover 2 installed at one end of the double-wall drill body 1 and a movable blade 3 between the double-wall drill body 1 and the upper end cover 2 .
[0047] Such as figure 2 and image 3 As shown, the upper end cover 2 is provided with a plurality of blades 201 circumferentially, and a plurality of cutting teeth 202 are arranged on the blade 201; 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 end cover surface through holes 205, and the center of the end cover surface 203 is provided with an end cover central hole 206.
[0048] Such as Figure 4-Figure 6 As shown, the double-wall drill bit body 1 includes a coaxial inner tube 101 and an outer tube 102, an annular space is formed between one end ...
Embodiment 2
[0061] This embodiment provides a construction method using an openable and closable drill bit for a double-wall drilling tool to realize positive and negative circulation, including:
[0062] Reverse circulation construction steps: After the double-wall drilling tool is installed with an openable and closeable 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 annular space through the double-wall drill pipe, and Enter the first cavity along the first through hole, push the movable blade to open until the arc edge of the movable blade is tangent to the inner contour of the installation groove, and then the movable blade is fully opened, and the fluid is ejected through the through hole on the end cover surface And shunt to the central channel for reverse circulation drilling construction;
[0063] Positive circulation construction steps: Stop the reverse circulation co...
Embodiment 3
[0065] This embodiment provides a construction method for lowering the gas drainage pipe by using an openable and closable drill bit for double-wall drilling tools, including: adopting the above-mentioned positive circulation construction steps until the construction reaches the designed hole depth, and lifting the set of drilling tool assemblies away At the bottom of the hole, carry out the reverse circulation construction step to return the rubber ball in the central channel. After the rubber ball returns, stop the fluid supply, and lower the gas drainage pipe of specific specifications from the tail of the double-wall drilling tool at the hole to 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 step is performed again to keep the movable blade open, continue to enter the gas drainage pipe to the bottom of the hole, stop the fluid supply again, and lift out the drilling tool...
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