CN217481202U

CN217481202U - Impact-resistant diamond compact

Info

Publication number: CN217481202U
Application number: CN202221697205.6U
Authority: CN
Inventors: 涂关富; 江诗贵; 刘强
Original assignee: Kingdream PLC; Sinopec Oilfield Equipment Corp
Current assignee: Sinopec Oilfield Equipment Corp
Priority date: 2022-06-30
Filing date: 2022-06-30
Publication date: 2022-09-23
Anticipated expiration: 2032-06-30

Abstract

The utility model relates to a diamond compact piece shocks resistance, including cylindricality carbide base member and diamond composite bed, the 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 diamond composite bed terminal surface middle part be provided with the boss of upwards arching, the convex ridge meet along radial extension and boss edge 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 discloses a boss falls the piece with gravel or shaft bottom rock and backs up, prevents that compound piece from openly strikeing the destruction. The convex ridge with strong attacking force is arranged at the cutting position, so that the attacking property of the composite sheet to the stratum is ensured, and the mechanical drilling speed of the drill bit is improved. The convex ridge with strong impact resistance is arranged on the side surface of the cutting position of the composite sheet, so that the impact resistance of the side surface of the composite sheet is improved, and the service life of the drill bit is prolonged.

Description

Impact-resistant diamond compact

Technical Field

The utility model relates to a diamond compact piece shocks resistance belongs to oil drilling technical field.

Background

Diamond drills were widely used in oil and gas drilling projects starting 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.

In the drilling process, the upper well wall of a well often falls into blocks, the rocks fall into the bottom of the well and are repeatedly crushed to form hard cores to impact the diamond compacts, so that the PDC drill bit cutting elements are failed. Similarly, when the drill encounters gravel in soft formations, the gravel can impact the diamond compact, resulting in bit breakup failure. For this phenomenon: chinese patent CN 201679451U proposes a cambered surface polycrystalline diamond compact, which solves the problem of impact resistance of the compact, but its own attack force is weaker, and thus the cutting efficiency is lower. China patent CN 209261495U proposes a diamond compact with a convex arc surface in the middle and a plane on the periphery, and although the compact partially considers the cutting efficiency and the front impact resistance improvement, the side impact resistance can not be effectively improved.

Disclosure of Invention

The utility model aims to solve the technical problem that not enough to provide a diamond compact piece shocks resistance to exist to above-mentioned prior art, it openly with side impact resistance reinforce, anti gravel performance is good, and cutting efficiency is high.

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, a plurality of convex ridges are arranged on the end face of the diamond composite layer and are connected with a transition curved surface through inclined planes, and the diamond composite layer is characterized in that a boss which is arched upwards is arranged in the middle of the end face of the diamond composite layer, the convex ridges are connected with the edge of the boss along the radial direction from the edge of the end face, and the convex ridges comprise positive convex ridges which extend upwards and negative convex ridges which extend downwards.

According to the scheme, the boss is a curved revolution surface or a chamfered frustum surface, and the highest point of the boss is higher than that of the raised ridge.

According to the scheme, 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 more than 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 cylindrical 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 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, 1 or more than 1 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 plane chamfer and a curved surface chamfer.

According to the scheme, the raised ridge extends straightly or is in an arched arc top or a concave arc top along the radial direction from the edge of the end surface, namely the positive side profile of the ridge top of the raised ridge is a straight line or an upper convex arc line or a lower concave arc line.

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

According to the scheme, the positive convex ridges and the negative convex 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, the inclined planes are connected through transition curved surfaces, the inner ends of the convex ridge and the inclined planes are connected with the edge of the lug boss through the transition curved surfaces, and therefore the end surface of the diamond composite layer with a convex and concave-convex fluctuation in the middle 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, elliptical or regular polygonal.

According to the scheme, the diamond composite layer is a polycrystalline diamond composite layer or a thermal stability polycrystalline diamond composite layer.

The beneficial effects of the utility model reside in that: 1. the middle part of the end face of the diamond composite layer is provided with the boss which is arched upwards, so that falling blocks of gravels or downhole rocks can be jacked open, the composite sheet is prevented from being damaged by front impact, and the impact resistance and gravel resistance of the composite sheet are improved; 2. the positive convex ridge and the negative convex ridge are arranged on the end face of the diamond composite layer, so that the diamond composite sheet not only has stronger capability of being absorbed into the stratum, but also realizes different attack capabilities, the convex ridge face with strong attack force is arranged at the cutting position, the aggressivity of the composite sheet to the stratum is ensured, the mechanical drilling speed of a drill bit is improved, the convex ridge face with strong impact resistance is arranged on the side face of the cutting position of the composite sheet, and the impact resistance of the side face of the composite sheet is improved; 3. positive and negative convex ridge and inclined plane constitute the unsmooth undulant diamond composite bed terminal surface of fairing, the combination of the limit cutting edge that undulates mutually in addition, form the cutting edge of multiple different performance of compound piece, make same diamond compact piece can deal with different stratum and creep into the demand, it is integrated to realize different attack ability, the attack ability and the shock resistance of compound piece of diamond have further been reinforceed, with its reasonable cloth on the diamond drill bit, can make diamond drill bit adapt to the drilling demand in multiple complicated stratum, and promote the life of drill bit.

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 fig. 6 are schematic diagrams of rock breaking according to a first embodiment of the present invention.

Fig. 7 is a perspective view of a seventh embodiment of the present invention.

Fig. 8 is a perspective view of an eighth embodiment of the present invention.

Detailed Description

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

In one embodiment, as shown in fig. 1 to 4, the diamond composite layer is disposed at one end of a cylindrical hard alloy substrate 102, the diamond composite layer is a polycrystalline diamond composite layer, the diamond composite layer and the hard alloy substrate are connected into a whole by 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 middle part of the end face of the diamond composite layer is provided with an upwardly arched boss 103 which is a conical spherical boss, the end face of the diamond composite layer is provided with 4 convex ridges comprising 2 upward extending

positive convex ridges

105 and 107 and 2 downward extending negative

convex ridges

104 and 106, the positive convex ridges and the negative convex ridges are uniformly distributed and staggered along the circumferential direction, each convex ridge extends from the edge of the end face to the edge of the boss along the radial direction, wherein the 2 positive convex ridges gradually increase from the edge to extend to the edge of the boss, and the 2 negative convex ridges gradually decrease from the edge to extend to the edge of the boss; the shape of the 2 negative convex ridges is an arc surface, namely the positive profile of the convex ridges is an arc line, the curvature radiuses of the arc are respectively R1 and R3 which are the same and 2mm or different, the convex ridges are in a straight extension shape along the radial direction from the edge of the end surface, the connecting lines of the two ends of the top ridge of the 2 downward extending negative convex ridges and the bottom plane of the diamond composite layer form included angles beta and alpha of-5 degrees, the bottom plane of the diamond composite layer is perpendicular to the axis of the columnar hard alloy substrate, the highest point of the negative convex ridge is lower than the highest point of the boss 103, and the height difference H1 is 1-2 mm. The 2 positive convex ridges are cambered surfaces, namely the positive profiles of the convex ridges are circular arc lines, the radiuses of curvature of the circular arcs are R2 and R4 respectively, the radiuses of curvature of the circular arcs are the same and are 6mm, and the radiuses of curvature of the circular arcs can be different, the convex ridges are extended straightly along the radial direction from the edge of the end surface, and the connecting lines of the two ends of the top ridge of the 2 upwards-extended positive convex ridges and the bottom plane of the diamond composite layer form included angles theta and gamma of 5 degrees. The highest point of the positive raised ridge is lower than that of the boss 103, and the height difference H2 is 2-3 mm. The two sides of the ridge are smoothly connected with inclined planes which incline downwards, the inclined planes are planes,

inclined planes

113 and 114 at two sides of the positive ridge 107 are smoothly connected through transition

curved surfaces

111, 112 and 115, an included angle delta 2 between the inclined planes at two sides is 150 degrees,

inclined planes

109 and 108 at two sides of the negative ridge 104 are smoothly connected through an included angle delta 1 between the inclined planes at two sides is 140 degrees, the positive ridge 107 of the other positive ridge 105 is in the same structure, and the negative ridge 106 is in the same structure as the negative ridge 104, so that 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 be the inclined plane chamfer, wherein be the inclined plane chamfer 116 of chamfer degree of depth 0.5mm in the peripheral edge 90 scope of positive convex ridge, be the inclined plane chamfer 110 of chamfer degree of depth 0.3mm in the peripheral edge 90 scope of negative convex ridge for whole terminal surface peripheral edge forms the limit cutting edge of different undulation from top to bottom to form the cutting edge of multiple different performance of compound piece with each convex ridge combination. The negative convex ridge, the inclined plane and the chamfer form a cutting edge with strong aggressivity, and the positive convex ridge, the inclined plane and the chamfer form a side face and a side cutting edge with strong impact resistance. The diamond compact of the embodiment has a circular radial section and a diameter of 15.8 mm. Fig. 5 and 6 are schematic diagrams showing that when the structure of the embodiment cuts the stratum frontally, gravel is met or the composite sheet falls off, the composite sheet is arranged on the drill bit, the surface of the negative ridge 104 and the adjacent surface of the negative ridge are used as main cutting edges, and the cutting surface formed by the negative ridge and the adjacent surface of the negative ridge is perpendicular to the bottom contour line tangent line of the drill bit. The gravel is jacked open by the central boss 103 of the composite sheet, and the front impact resistance of the composite sheet is greatly improved due to the fact that the cambered surface is high in impact resistance relative to the plane. Meanwhile, the convex ridge surface has stronger stratum feeding capacity relative to the plane, so the aggressivity of the composite sheet is improved. The face formed by the

positive convex ridges

105 and 107 on the side face of the composite sheet and the adjacent face has stronger shock resistance, so that the face can better resist the impact force generated by gravel passing between the teeth or falling blocks, and the side face failure of the composite sheet is reduced.

The second embodiment is as shown in fig. 1 to 4, and is different from the first embodiment in that the angle β between the negative ridge 104 and the bottom plane is 0 °, and the rest is the same.

Embodiment three is as shown in fig. 1 to 4, and is different from embodiment one in that the angle β between the negative ridge 104 and the bottom plane is 0 °, the angle α between the ridge 106 and the bottom plane is 5 °, and the rest is the same.

Embodiment four is shown in fig. 1 to 4, which is different from embodiment one in that the angle β between the negative ridge 104 and the bottom plane is 0 °, the angle α between the ridge 106 and the bottom plane is 5 °, the radius R3 of curvature of the ridge 106 is 6mm, and the rest are the same.

Embodiment five is as shown in fig. 1 to 4, which is different from the embodiment one in that the peripheral chamfers of the ridges are all oblique chamfers, and the width (depth) is 0.4 mm.

Sixth embodiment is as shown in fig. 1 to 4, which is different from embodiment 1 in that the peripheral edge of the

positive ridge

107, 105 is rounded at 90 ° and has a radius of 0.6 mm.

The seventh embodiment is shown in fig. 7, which has 6

ridges

704, 705, 706, 707, 708, 709, wherein the ridge 704 is a negative ridge with strong aggressiveness, and the remaining ridges are positive ridges with strong impact resistance. The radius of curvature of the curved surface of the negative ridge 704 is 2mm, the included angle between the ridge 704 and the bottom plane is-5 degrees, and the included angle between the inclined planes at the two sides of the ridge 704 is 140 degrees. The curvature radius of the cambered surfaces of the other convex ridges is 6mm, the included angles between the convex ridges and the bottom plane are 5 degrees, the included angles between the inclined planes on the two sides are 150 degrees, and the chamfers of the edge surfaces are 0.5 mm. The rest of the structure is the same as the first embodiment.

The eighth embodiment is as shown in fig. 8, and includes 2

positive ridges

805, 807, two positive ridges all have strong impact resistance, 2

negative ridges

804, 806, the ridge shape is a plane, the negative ridge forms an angle of 0 ° with the bottom plane, and the inclined planes on both sides of the negative ridge are also planes parallel to the bottom plane, and are connected with the negative ridge to form a larger cutting plane, the planar part is adopted to bite into the formation, the ridges of the

positive ridges

805, 807 are cambered surfaces, the curvature radius is 6mm, the angles between the ridges and the bottom plane are both 5 °, the angles between the inclined planes on both sides are both 150 °, the edge chamfers are both 0.5mm, and the front and side impact resistance of the tooth is improved.

Claims

1. The utility model provides an impact-resistant 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 diamond composite bed terminal surface middle part be provided with the boss of upwards arching, the convex ridge meet along radially extending with the boss edge along the terminal surface edge, the convex ridge including the positive convex ridge of upwards extending and downwardly extending's negative convex ridge.

2. The impact resistant diamond compact of claim 1 wherein said boss is a curvilinear surface of revolution or a chamfered frustum of a pyramid, said boss having a peak point higher than a peak point of said ridge.

3. An impact resistant diamond compact according to claim 1 or 2, wherein the angle between the line connecting the two ends of the crest of the upwardly extending positive ridge and the bottom plane of the diamond composite layer is greater than 0 ° to 20 °, and the bottom plane of the diamond composite layer is perpendicular to the axis of the cylindrical cemented carbide substrate.

4. An impact-resistant diamond compact according to claim 1 or 2, wherein the angle between the line connecting the two ends of the ridge top of the downward extending negative ridge and the bottom plane of the diamond composite layer is 0 ° to-20 °, and the bottom plane of the diamond composite layer is perpendicular to the axis of the cylindrical cemented carbide substrate.

5. The impact resistant diamond compact of claim 1 or 2 wherein said ridges are 3 to 6 ridges spaced circumferentially.

6. An impact resistant diamond compact according to claim 1 or 2, wherein said edge of said end face is provided with 1 or more than 1 different kinds of 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 plane chamfer and a curved surface chamfer.

7. An impact resistant diamond compact according to claim 1 or 2, wherein said ridges extend straight or in the form of an arched or concave arch from the edge of the end surface in the radial direction, i.e. the positive lateral profile of the ridge top of said ridges is a straight line or a convex or concave arc.

8. The impact resistant diamond compact of claim 7 wherein said ridges are in the shape of arcs, curves, planes or edges, i.e., the forward profile of said ridges is an arc, curve, line or broken line.

9. An impact resistant diamond compact according to claim 1 or 2, wherein said positive ridges and said negative ridges are circumferentially staggered.

10. An impact-resistant diamond compact according to claim 1 or 2, wherein both sides of the raised ridge are connected with inclined planes which are inclined downwards, the inclined planes are planes or curved surfaces, the inclined planes are connected through a transition curved surface, and the inner ends of the raised ridge and the inclined planes are connected with the edge of the boss through the transition curved surface, thereby forming a diamond composite layer end surface with a raised and concave-convex undulation in the middle; 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.