CN217462038U - Convex ridge type diamond compact - Google Patents

Abstract

The utility model relates to a convex ridge type diamond compact piece, including cylindricality carbide base member and diamond composite bed, diamond composite bed set up the one end at the carbide base member, both link together integratively, diamond composite bed terminal surface be provided with many convex ridges, link to each other its characterized in that through inclined plane and transition curved surface between each convex ridge the convex ridge extend to the terminal surface center from the terminal surface edge, the convex ridge including the positive convex ridge of ascending extension and downwardly extending's negative convex ridge. The utility model has the advantages of strong ability to be absorbed into the stratum, different attack abilities, and strong shock resistance; positive and negative convex ridge and inclined plane constitute smooth unsmooth undulation's diamond composite bed terminal surface, and the combination of the side cutting edge that undulates about adding and convex ridge forms the cutting edge of multiple different performance of compound piece for same diamond compound piece can deal with different stratum drilling demands, realizes different aggressive ability integrations.

Description

Convex ridge type diamond compact

Technical Field

The utility model relates to a convex ridge type diamond compact belongs to oil drilling technical field.

Background

Diamond drill bits were increasingly used extensively in oil and gas drilling projects beginning in the 80 s of the last century. Diamond drill bits are primarily comprised of a bit body and cutting elements, and diamond drill bits are classified into three categories according to the cutting elements: PDC (polycrystalline diamond) bits, TSP (thermally stable polycrystalline diamond) bits, and natural diamond bits. The PDC drill bit is mainly used for drilling soft to medium hard formations, and through continuous technical progress, the application range of the PDC drill bit is wider and wider, and the PDC drill bit has better economic value. TSP bits are mainly used for drilling medium to extremely hard formations. At present, deep well operation in petroleum and natural gas drilling engineering is gradually increased, and drilling of encountered strata is more and more complex.

The cutting end of the existing diamond composite sheet is mostly of a plane structure, and when drilling encounters dense mudstone, the diamond composite sheet is difficult to bite into a stratum to form effective cutting. After the drill bit penetrates through the compact layer, the stratum is soft and hard in a staggered mode and changes frequently, the impact load borne by the composite sheet is large, and the diamond composite sheet is prone to tooth breakage and failure, so that the drill bit is prone to overall failure. Therefore, a diamond compact with strong impact resistance and strong stratum intake capacity is urgently needed in a drilling site. The impact resistance of the existing diamond compact is mainly improved by changing the interface structure of the diamond layer and the hard alloy base in the diamond compact to reduce the residual stress of the diamond layer or changing the material formula and the processing technology. The PDC layer with the special-shaped teeth of the ball head shape, the cone shape and the like is adopted, although the impact resistance of the PDC layer with the special-shaped structure is improved, the phenomena of large drilling cutting resistance, large torque of a drill bit, low drilling efficiency and the like exist in the using process. To address this problem, chinese patent 201520471001.4 discloses a polycrystalline diamond compact with a low cutting resistance curved surface structure, which solves the problem of drilling efficiency in complex strata, but the utilization rate and the chip removal effect are not ideal. Chinese patent 201521102644.8 discloses a polycrystalline diamond compact with a multi-edge special-shaped structure, which solves the problems of drilling efficiency and utilization rate of complex strata, but has the problem of unsmooth chip removal channel, etc. Chinese patent 201721327355.7 discloses a ridge tooth with different edge widths to realize the application of one tooth to multiple strata, but has the problem of narrow application range of the ridge tooth with wide edge.

Disclosure of Invention

The utility model aims to solve the technical problem that not enough to above-mentioned prior art exists provides a convex ridge type diamond compact piece, and not only shock resistance is strong, possesses many attack ability moreover, can effectual adaptation multiple stratum.

The utility model discloses a solve the technical scheme that the problem that the aforesaid provided adopted and be: the diamond composite layer is arranged at one end of the hard alloy substrate and is connected with the hard alloy substrate into a whole, the end face of the diamond composite layer is provided with a plurality of convex ridges which are connected with each other through inclined planes and transition curved surfaces, and the diamond composite layer is characterized in that the convex ridges extend from the edge of the end face to the center of the end face and comprise upward extending positive convex ridges and downward extending negative convex ridges.

According to the scheme, the included angle between the connecting line of the two ends of the ridge top of the upwards extending positive convex ridge and the bottom plane of the diamond composite layer is 0-20 degrees, further, the included angle of the positive convex ridge is 3-10 degrees, and the bottom plane of the diamond composite layer is perpendicular to the axis of the columnar hard alloy substrate.

According to the scheme, the included angle between the connecting line of the two ends of the ridge top of the downward extending negative convex ridge and the bottom plane of the diamond composite layer is smaller than 0-20 degrees, further, the included angle of the negative convex ridge is-3-10 degrees, and the bottom plane of the diamond composite layer is perpendicular to the axis of the cylindrical hard alloy substrate.

According to the scheme, the number of the convex ridges is 3-6, and the convex ridges are distributed at intervals along the circumferential direction.

According to the scheme, 2 or more than 2 different chamfers are arranged on the edge of the end face to form different up-and-down fluctuating edge cutting edges. The chamfer slope surface is one or more of an inclined plane chamfer, a bending surface chamfer and a curved surface chamfer.

According to the scheme, the convex ridge is in a straight extending shape or an arched arc top shape or a concave arc top shape from the edge of the end face to the center of the end face, namely, the positive lateral profile of the ridge top of the convex ridge is a straight line or an upper convex arc line or a lower concave arc line.

According to the scheme, the shape of the convex ridge is an arc surface, a curved surface, a plane or an edge, namely, the positive profile of the convex ridge is an arc line, a curved line, a straight line or a broken line.

According to the scheme, the positive ridges and the negative ridges are arranged in a staggered mode along the circumferential direction.

According to the scheme, the two sides of the convex ridge are connected with inclined planes which incline downwards, the inclined planes are planes or curved surfaces, and the inclined planes are connected through transition curved surfaces, so that the concave-convex fluctuated diamond composite layer end surface is formed.

According to the scheme, the radial section of the diamond composite layer is the same as that of the hard alloy substrate and is circular, elliptic or regular polygonal.

The beneficial effects of the utility model reside in that: 1. the positive convex ridge and the negative convex ridge are arranged on the end surface of the diamond composite layer, so that the diamond composite sheet not only has stronger capability of being eaten into the stratum and realizing different attack capabilities, but also has strong shock resistance; 2. positive and negative convex ridge and inclined plane constitute the unsmooth undulant diamond composite bed terminal surface of fairing, the combination of the side cutting edge that undulates in addition and convex ridge forms the cutting edge of multiple different performance of compound piece for same diamond compact piece can deal with different stratum and creep into the demand, realizes different attack ability integrations, has further strengthened the attack ability and the shock resistance of diamond compact piece, with its reasonable cloth on the diamond bit, can make diamond bit adapt to the drilling demand in multiple complicated stratum.

Drawings

Fig. 1 to 4 are a perspective view, a plan view, a front view and a side view of an embodiment of the present invention, respectively.

Fig. 5 to 8 are a perspective view, a plan view, a front view and a side view, respectively, of a second embodiment of the present invention.

Detailed Description

The present invention will be further described with reference to the accompanying drawings and examples.

The first embodiment is shown in fig. 1 to 4, and comprises a cylindrical hard alloy substrate 102 and a diamond composite layer 101, wherein the diamond composite layer is arranged at one end of the hard alloy substrate, the diamond composite layer is a polycrystalline diamond composite layer, the diamond composite layer and the hard alloy substrate are connected into a whole through ultra-high temperature and high pressure sintering, and a bonding surface between the hard alloy substrate and the diamond composite layer is a plane, a concave-convex block surface or a groove surface. The end face of the diamond composite layer is provided with 4 ridges comprising 2 positive ridges 103 and 105 extending upwards and 2 negative ridges 104 and 106 extending downwards, the positive ridges and the negative ridges are uniformly distributed and staggered along the circumferential direction, each ridge extends from the edge of the end face to the center of the end face, wherein the 2 positive ridges gradually increase from the edge to the center and extend to the center of the end face, and the 2 negative ridges gradually decrease from the edge to the front end and extend to about 1/2 of the distance from the center of the end face; the shape of each convex ridge is an arc surface, namely the positive profile of each convex ridge is an arc line, the curvature radiuses of the arcs are respectively R1, R2, R3 and R4 which are all the same and 2mm or different, and the convex ridges are in a straight extending shape from the edge of the end surface to the center of the end surface. The included angles beta and alpha between the connecting lines at the two ends of the ridge top of the 2 upward extending positive ridges and the bottom plane of the diamond composite layer are 5 degrees, the included angles theta and gamma between the connecting lines at the two ends of the ridge top of the 2 downward extending negative ridges and the bottom plane of the diamond composite layer are-5 degrees, and the bottom plane of the diamond composite layer is perpendicular to the axis of the cylindrical hard alloy substrate. The two sides of the ridge are smoothly connected with inclined planes which incline downwards, the inclined planes are planes, wherein the inclined planes 107 and 108 on the two sides of the positive ridge 103, the inclined planes 109 and 110 on the two sides of the negative ridge 104, the inclined planes 111 and 112 on the two sides of the positive ridge 105 and the inclined planes 113 and 114 on the two sides of the negative ridge 106 are smoothly connected through a transition curved surface, and thus the concave-convex diamond composite layer end surface is formed. The terminal surface edge be provided with 2 kinds of different chamfers, the chamfer domatic for inclined plane chamfer and circular arc chamfer, wherein be the circular arc chamfer at positive convex ridge peripheral edge 90 scopes, be the inclined plane chamfer at negative convex ridge peripheral edge 90 scopes for whole terminal surface neighboring edge forms the different limit cutting edge of fluctuation from top to bottom, and form the cutting edge of multiple different performance of compound piece with each convex ridge combination. The diamond compact of the embodiment has a circular radial section and a diameter of 15.8 mm.

A second embodiment is shown in fig. 5 to 8, and is different from the previous embodiment in that 2 positive ridges 203 and 205 are convex circular arc lines which are in a shape of an arched top from the edge of the end face to the center of the end face, the positive side profile of the ridge top of the ridge is an upward convex arc line, the connecting line of the two ends of the ridge top of the 2 upward extending positive ridges has an included angle delta of 5 degrees with the bottom plane of the diamond composite layer, and the 2 positive ridges are the same in structure and gradually increase in height from the edge to the center and extend to the center of the end face; the 2 negative convex ridges 204 and 206 are concave arc lines and are in the shape of a concave arc top from the edge of the end surface to the center of the end surface, the positive side profile of the ridge top of the convex ridge is a concave arc line, and the included angle epsilon between the connecting line of the two ends of the ridge top of the downward extending negative convex ridge and the bottom plane of the diamond composite layer is-5 degrees. The inclined surfaces at two sides of the 4 ridges 203, 204, 205, 206 on the end surface of the diamond composite layer are curved surfaces, and the inclined surfaces are smoothly connected through the transition curved surfaces, thereby forming the concave-convex diamond composite layer end surface. The other structure is the same as the previous embodiment.

Claims (10)

1. The utility model provides a convex ridge type diamond compact piece, includes cylindricality carbide base member and diamond composite bed, diamond composite bed set up the one end at the carbide base member, both link together integratively, diamond composite bed terminal surface be provided with many convex ridges, link to each other through inclined plane and transition curved surface between each convex ridge, its characterized in that the convex ridge extend to the terminal surface center from the terminal surface edge, the convex ridge including the positive convex ridge of ascending extension and downwardly extending's negative convex ridge.

2. The convex ridge type diamond compact of claim 1, wherein the included angle between the connecting line of the two ends of the ridge top of the upward extending positive convex ridge and the bottom plane of the diamond composite layer is 0-20 degrees, and the bottom plane of the diamond composite layer is perpendicular to the axis of the cylindrical hard alloy substrate.

3. The convex ridge type diamond compact of claim 2, wherein the angle between the connecting line of the two ends of the ridge top of the downward extending negative convex ridge and the bottom plane of the diamond composite layer is less than 0 degree to-20 degrees, and the bottom plane of the diamond composite layer is perpendicular to the axis of the cylindrical cemented carbide substrate.

4. The convex ridge type diamond compact according to claim 2 or 3, wherein the number of convex ridges is 3 to 6, and the convex ridges are circumferentially spaced.

5. The convex ridge type diamond compact of claim 2 or 3 wherein said end face edge is provided with 2 or more different chamfers to form different up and down undulating edge cutting edges; the chamfer slope surface is one or more of an inclined plane chamfer, a bending surface chamfer and a curved surface chamfer.

6. The convex ridge type diamond compact according to claim 2 or 3, wherein said convex ridge is in a straight extension form or a curved top form or a concave top form from the edge of the end face to the center of the end face, i.e., the positive side profile of the top of the convex ridge is a straight line or a convex arc or a concave arc.

7. The convex ridge type diamond compact of claim 6 wherein said convex ridge is in the shape of a curved surface, a plane or an edge, i.e. the forward profile of said convex ridge is an arc, a curve, a straight line or a polygonal line.

8. The convex ridge diamond compact of claim 2 or 3 wherein said positive ridges and negative ridges are circumferentially staggered.

9. The convex ridge type diamond compact according to claim 2 or 3, wherein both sides of the convex ridge are connected with inclined planes which incline downward, the inclined planes are planes or curved surfaces, and the inclined planes are connected through a transition curved surface, thereby forming the concave-convex fluctuated diamond composite layer end surface.

10. The convex ridge type diamond compact of claim 8 wherein said diamond composite end surface is provided with 4 convex ridges comprising 2 upward extending positive convex ridges and 2 downward extending negative convex ridges, said positive convex ridges and said negative convex ridges are circumferentially equispaced and staggered, each convex ridge extending from the edge of the end surface to the center of the end surface, wherein 2 positive convex ridges are progressively higher from the edge to the center and extend to the center of the end surface, and 2 negative convex ridges are progressively lower from the edge to the front end and extend to about 1/2 times the distance from the center of the end surface.

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