CN-122014120-A - Polycrystalline diamond compact and gauge drill bit

CN122014120ACN 122014120 ACN122014120 ACN 122014120ACN-122014120-A

Abstract

The invention relates to a polycrystalline diamond compact and a gauge protection drill bit, wherein the polycrystalline diamond compact comprises an integrated diamond layer and a matrix, an embedded groove matched and corresponding to the diamond layer is formed in the center of the top of the matrix, the diamond layer is embedded into the embedded groove, the top surface of the diamond layer does not exceed the notch of the embedded groove, and the top edge of the matrix replaces the existing diamond layer to be connected with a drill bit body in a brazing manner, so that gaps between the polycrystalline diamond compact and the drill bit body are avoided, and the probability of breakage of the top edge of the polycrystalline diamond compact is reduced. The gauge protection drill bit provided by the invention can prolong the service life.

Inventors

TONG JUNFENG
WANG CHAOLONG
ZHENG LIANGLIANG
WANG SHI
ZHANG WEI
WANG LIANGWEN
XIAO ZHILING
HE TIANYUN
PANG WENLONG
LI MINGTAO
WU HAO
HU SONGHAO
ZANG BO
ZHANG FAN
DONG WEIBIN

Assignees

河南旋风新材料科技有限公司

Dates

Publication Date: 20260512
Application Date: 20250430

Claims (10)

1. A polycrystalline diamond compact comprises an integrated diamond layer and a matrix, and is characterized in that an embedded groove matched and corresponding to the diamond layer is formed in the center of the top of the matrix, the diamond layer is embedded into the embedded groove, and the top surface of the diamond layer does not exceed the notch of the embedded groove.
2. The polycrystalline diamond compact of claim 1 wherein the top edge of the substrate is provided with a chamfer.
3. The polycrystalline diamond compact of claim 1 or 2 wherein the substrate bottom edge is provided with a chamfer angle B.
4. A gage-keeping drill bit comprising the polycrystalline diamond compact of claim 3 is characterized by further comprising a drill bit body, a cutting compact A and a cutting compact B, wherein a plurality of mounting blocks are circumferentially distributed on the top edge of the drill bit body, the polycrystalline diamond compact is mounted on the outer side face of each mounting block, the cutting compact A is obliquely mounted on one side edge of the top of each mounting block, a plurality of mounting columns extend out of the center of the top of the drill bit body upwards, the cutting compact B is obliquely arranged on the top end of each mounting column, the cutting compact B is lower than the cutting compact A, and the cutting compact A and the cutting compact B face the same.
5. The gage drill bit according to claim 4, wherein the mounting posts are disposed between adjacent mounting blocks.
6. The gage drill bit according to claim 4, wherein the other side of the top of the mounting block is provided with a guide ramp.
7. The gage drill bit according to claim 5, wherein a pilot conical surface is provided between adjacent mounting blocks.
8. The gage-saving drill bit according to claim 7, wherein the middle lower portion of the drill bit body is provided with a cavity, and the guide conical surface is provided with a guide hole communicated with the cavity.
9. The gage drill bit according to claim 8, wherein the lower portion of the cavity is internally threaded.
10. The gage drill bit according to claim 8, wherein the pilot bore is disposed perpendicular to the pilot cone face.

Description

Polycrystalline diamond compact and gauge drill bit Technical Field The invention relates to the technical field of gauge protection drill bits, in particular to a polycrystalline diamond compact and a gauge protection drill bit. Background The gauge drill bit is a drill bit designed with a special gauge structure, and can keep the diameter of a borehole unchanged in the drilling process and prevent the borehole from shrinking or deforming. Polycrystalline diamond compacts are often used in cutting and gage portions of gage drills, cutting compacts 01 and gage compacts 02, respectively. Referring to fig. 1, the prior art cutting composite sheet 01 and gage composite sheet 02 have substantially the same structure. However, the mounting states of the cutting composite piece 01 and the gage composite piece 02 are different. The tail end of the cutting composite sheet 01 is soldered at the head end of the drill bit body, namely, the hard alloy matrix of the cutting composite sheet 01 is soldered with the head end of the steel drill bit body. The head end of the cutting composite sheet 01 is not connected with the drill bit body, while the gauge protection composite sheet 02 is embedded into the side wall of the drill bit body and does not exceed the side wall of the drill bit body. The hard alloy matrix of the gauge protection composite sheet 02 is also in braze joint with the drill bit body. However, the polycrystalline diamond layer and braze are not wetted. Gaps are reserved between the polycrystalline diamond layer of the gauge protection composite sheet 02 and the drill bit body, and the polycrystalline diamond layer of the gauge protection composite sheet 02 is extruded to easily break along edges, so that the gauge protection composite sheet 02 fails in advance. Disclosure of Invention The invention aims to solve the problems and provide a polycrystalline diamond compact and a gauge protection drill bit. The technical scheme includes that the polycrystalline diamond compact comprises an integrated diamond layer and a matrix, the diamond layer and the matrix are formed through high-pressure high-temperature sintering, an embedded groove matched with the diamond layer is formed in the center of the top of the matrix and used for containing diamond powder for generating the diamond layer, the diamond powder enters the embedded groove and is sintered at high temperature and high pressure to form a state that the diamond layer is embedded into the embedded groove, the top surface of the diamond layer does not exceed a notch of the embedded groove, the top edge of the matrix replaces the existing diamond layer to be connected with a drill bit body in a brazing mode, gaps are avoided between the polycrystalline diamond compact and the drill bit body, and the probability of breakage of the top edge of the polycrystalline diamond compact is reduced. Preferably, the embedded groove is arranged concentrically with the substrate, so that the diamond layer and the substrate can be concentric, and the diamond layer is ensured to be uniformly worn. Preferably, the edge of the top of the matrix is provided with a chamfer angle A so as to increase the space for filling the brazing material and improve the brazing connection strength. Preferably, the edge of the bottom of the base body is provided with a chamfer angle B, so that on one hand, convenience in embedding the polycrystalline diamond compact into the drill bit body is improved, on the other hand, space for filling brazing filler metal is increased, and brazing connection strength is improved. The gauge protection drill bit comprises the polycrystalline diamond compact, a drill bit body, a cutting compact A and a cutting compact B, wherein a plurality of mounting blocks are circumferentially distributed on the top edge of the drill bit body, the polycrystalline diamond compact is mounted on the outer side face of each mounting block to achieve the gauge protection effect, the cutting compact A is obliquely mounted on one side edge of the top of each mounting block to achieve the effect of cutting peripheral earth blocks, a plurality of mounting columns extend out of the center of the top of the drill bit body upwards, the cutting compact B is obliquely arranged on the top of each mounting column to achieve the effect of cutting central earth blocks, the cutting compact B is lower than the cutting compact A to enable the peripheral earth blocks to be cut earlier than the central earth blocks, and the cutting compact A and the cutting compact B face the same to ensure that the peripheral earth blocks and the central earth blocks can be cut. Preferably, the mounting posts are correspondingly disposed between adjacent mounting blocks such that the center soil block can be discharged along the gap of the adjacent mounting blocks. Preferably, the other side of the top of the mounting block is provided with a guiding inclined plane for guiding the peripheral soil blocks