Special-shaped balling resistant PDC drill bit
A technology of mud balls and drill bits, which is applied in the direction of drill bits, drilling equipment, earthwork drilling and production, etc., to achieve good effects of preventing mud balls of drill bits, improving ROP, and ensuring underground safety.
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Example Embodiment
[0026] Example 1
[0027] Such as Figure 1 to 3 As shown, this embodiment provides a special mud-repellent package PDC drill bit, which includes a drill bit body 3, a threaded joint located at the lower part of the drill bit body 3 and connected to a drill rod 1, a plurality of blades 5 located on the upper part of the drill bit body 3, two phases The grooves between the adjacent blades 5 form chip flutes 7, and each blade 5 is equipped with a composite sheet 4, which is characterized in that: a mud-repellent pocket 2 is provided on one side of each blade 5, so The outer edge of the mud-repellent sink 2 starts below the composite sheet 4, and the inner edge of the mud-repellent sink 2 ends at the chip flute 7.
Example Embodiment
[0028] Example 2
[0029] This embodiment is further optimized on the basis of embodiment 1, specifically:
[0030] The blade wing 5 is composed of an inner cone 5-3, a nose 5-2 and an outer cone 5-1 which are connected in sequence. The outer edges of the mud-repellent sink 2 are the inner cone 5-3 and the nose 5-2. The contour trajectory formed by the outer cone portion 5-1 is offset to the lower part of the composite sheet 4, and the second characteristic surface of the blade is formed from the outer edge of the mud-repellent pocket 2 to the chip groove, and the second characteristic faces the drill bit. The material is removed in the opposite direction to form a mud-repellent pocket 2.
Example Embodiment
[0031] Example 3
[0032] This embodiment is further optimized on the basis of Embodiment 1 or 2, specifically:
[0033] The outer edge of the mud-repellent pocket 2 is formed by the contour trajectory formed by the inner cone 5-3, the nose 5-2, and the outer cone 5-1 offset to the lower part of the composite sheet 4 by 10-20mm, which is the second feature Facing the opposite direction of the drill bit, remove 5-8mm material to form mud-repellent pocket 2.
[0034] The drill body 3 is provided with a plurality of nozzles 6.
[0035] The PDC drill bit with mud-repellent pocket can pass the extruded colloidal mudstone through the first surface of the blade at the lower end of the composite sheet at a distance of 10-20mm, and then break the contact with the surface of the blade to form the second surface of the blade A certain space forms a suspended state. The mud pump of the main equipment on the ground passes the drilling fluid through the high-pressure manifold→drill pipe→drill col...
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