Mixed cutting type tricone bit

Abstract

The utility model belongs to the technical field of cone bits, and particularly relates to a mixed cutting type tricone bit which comprises cones, main cutting teeth are embedded in base bodies of the cones, the main cutting teeth are composed of transverse cutting teeth and longitudinal cutting teeth, and the transverse cutting teeth and the longitudinal cutting teeth are arranged on the base bodies of the cones. And the transverse cutting teeth and the longitudinal cutting teeth are transversely and longitudinally embedded on the base body of the cone at intervals. The main cutting teeth of the cone are transversely and longitudinally embedded at intervals, the tooth crest distance is small, drill jumping is not prone to occurring, the cone rotates stably, the hard alloy teeth are prevented from being broken and broken, the cone rotates stably, and meanwhile a bearing sealing system is protected.

Description

Technical Field

[0001] The utility model belongs to the technical field of roller drill bits, and in particular relates to a mixed cutting type three-roller drill bit. Background Art

[0002] The rock-breaking mechanism of a three-cone drill bit primarily relies on the impact and crushing action of the carbide teeth on the cones, which creates rock cutting and crushing, generating footage. Analysis of rock crushing characteristics during drilling indicates that "indentation crushing" plays a primary role in the crushing process. The drill bit's teeth, under axial load (impact dynamic loading), press into the rock, causing volumetric crushing beneath the teeth, forming pits. The rolling action of the teeth along the wellbore causes these pits to expand, generating footage. Existing three-cone drill bits feature carbide teeth with their tips positioned longitudinally (axially) along the cones. This distance from the hole bottom creates a large gap between the tips, creating raised ridges at the bottom of the well during drilling. This significantly impacts the rate of penetration (ROP) and slows down the drilling speed. Three-cone drill bits primarily rely on the impact and crushing action of the carbide teeth on the cones, creating rock cutting and crushing. This large gap between the tips makes the teeth susceptible to breakage and chipping. Utility Model Content

[0003] The purpose of the utility model is to provide a hybrid cutting type three-cone drill bit to solve the problems existing in the background technology.

[0004] To achieve the above-mentioned purpose, the present invention provides the following technical solution: a mixed cutting three-cone drill bit, comprising a cone, wherein the base of the cone is inlaid with main cutting teeth, and the main cutting teeth are composed of transverse cutting teeth and longitudinal cutting teeth, and the transverse cutting teeth and longitudinal cutting teeth are inlaid on the base of the cone with transverse and longitudinal intervals.

[0005] Preferably, the main cutting teeth are provided in two circles.

[0006] Preferably, auxiliary cutting teeth are respectively provided on the top and bottom of the cone.

[0007] Preferably, the axis projection of the transverse cutting tooth is perpendicular to the axis of the cone.

[0008] Preferably, the projection of the axis of the cone of the longitudinal cutting tooth is parallel to the axis of the cone.

[0009] The beneficial effects of the utility model are as follows: the main cutting teeth of the cone are inlaid with intervals in the horizontal and vertical directions, the tooth top spacing is small, the drill is not easy to jump, the cone rotates smoothly to prevent the carbide teeth from breaking or cracking, and the cone rotates smoothly while also protecting the bearing sealing system. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 It is a structural diagram of the present utility model. DETAILED DESCRIPTION

[0011] The specific implementation of the present invention is described in detail below with reference to the accompanying drawings and preferred embodiments.

[0012] like Figure 1 As shown, a hybrid cutting three-cone drill bit comprises a cone 1. The cone base is embedded with main cutting teeth 2, which consist of transverse cutting teeth 3 and longitudinal cutting teeth 4. The transverse and longitudinal cutting teeth are embedded in the cone base with transverse and longitudinal spacing. The main cutting teeth are spaced laterally and longitudinally, resulting in a small spacing between tooth tips, which reduces drill jumps and ensures smooth cone rotation, preventing carbide tooth breakage and fracture. Specifically, the main cutting teeth are arranged in two circles. Auxiliary cutting teeth are provided at the top and bottom of the cone, respectively. The axis projections of the transverse cutting teeth are perpendicular to the cone axis. The axis projections of the longitudinal cutting teeth are parallel to the cone axis. The main cutting teeth 2 are spaced laterally and longitudinally, eliminating the formation of a ridge at the bottom of the well during drilling. Furthermore, the fracture cracks formed by the carbide teeth in the rock formation intersect in both the longitudinal and longitudinal directions, making it easier to crush the rock formation, resulting in faster drilling speed and significantly improved tunneling efficiency. At the same time, it also overcomes the situation of local stress, alleviates the impact load to a great extent, has good safety, high rock breaking efficiency, and is suitable for long-distance, long-term, high mechanical drilling speed continuous operation.

[0013] The shapes of the transverse cutting teeth and the longitudinal cutting teeth of the main cutting teeth of the cone can be the same or different, as long as the teeth are spaced apart in the transverse and longitudinal directions.

[0014] Manufacturing of transverse carbide teeth embedded in the new hybrid cutting three-cone drill bit:

[0015] A. Make pressing molds according to the design drawings;

[0016] B. Mix tungsten carbide powder and cobalt powder according to the design drawings;

[0017] C. Granulation;

[0018] D. sintering;

[0019] E. Surface polishing;

[0020] F. Inspection;

[0021] Equipped with a new type of hybrid cutting three-cone drill bit with inlaid transverse carbide teeth.

[0022] A. Drill and reamer the tooth holes on the outer surface of the cone according to the design drawings;

[0023] B. Measure the diameter of the tooth holes;

[0024] C. Grind the outer diameter of the new thorn-shaped carbide tooth inlay according to the hole diameter;

[0025] D. Press the transverse carbide tooth inlay of the new hybrid cutting three-cone drill bit into the tooth hole of the cone to complete the assembly.

[0026] Finally, assemble the cone on the three-cone drill bit and it can be used.

[0027] It should be pointed out that ordinary technicians in this technical field can make several improvements and modifications without departing from the principles of the present invention, and these improvements and modifications should also be regarded as within the scope of protection of the present invention.

Claims

1. A hybrid cutting three-cone drill bit, comprising a cone, wherein a base of the cone is inlaid with main cutting teeth, characterized in that: The main cutting teeth are composed of transverse cutting teeth and longitudinal cutting teeth, and the transverse cutting teeth and longitudinal cutting teeth are embedded on the base of the cone with transverse and longitudinal intervals.

2. The hybrid cutting tri-cone drill bit according to claim 1, characterized in that: The main cutting teeth are divided into two circles.

3. The hybrid cutting tri-cone drill bit according to claim 1, characterized in that: Auxiliary cutting teeth are respectively provided on the top and bottom of the cone.

4. The hybrid cutting tri-cone drill bit according to claim 1, characterized in that: The axis projection of the transverse cutting tooth is perpendicular to the axis of the cone.

5. The hybrid cutting tri-cone drill bit according to claim 1, characterized in that: The projection of the axis of the cone of the longitudinal cutting tooth is parallel to the axis center of the cone.

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