CN215927274U

CN215927274U - Polycrystalline diamond PDC (polycrystalline diamond compact) composite sheet with multiple cutting surfaces

Info

Publication number: CN215927274U
Application number: CN202122608741.6U
Authority: CN
Inventors: 邹大双; 林辉
Original assignee: Wuhan Eastar Tool Co ltd
Current assignee: Wuhan Eastar Tool Co ltd
Priority date: 2021-10-28
Filing date: 2021-10-28
Publication date: 2022-03-01
Anticipated expiration: 2031-10-28

Abstract

A polycrystalline diamond PDC (polycrystalline diamond compact) composite sheet with multiple cutting surfaces comprises a composite sheet body formed by a polycrystalline diamond layer and a hard alloy base, wherein multiple forward cutting surfaces which are sequentially and symmetrically arranged from front to back along a neutral surface and lateral cutting surfaces which are symmetrically arranged in pairs along the neutral surface are arranged on the polycrystalline diamond layer, the lateral cutting surfaces are symmetrically arranged on two sides of at least one forward cutting surface and are arranged at a certain angle, a first wedge surface and a second wedge surface which are paired are arranged on the front side of the composite sheet body, so that a wedge angle is formed at the head of the composite sheet body, and the lower ends of the first wedge surface and the second wedge surface extend to the side wall or the bottom surface of the composite sheet body; thus, the forward cutting faces of the present invention have different rake angles, thereby providing different aggressiveness and impact resistance; the symmetrically arranged lateral cutting surfaces and the forward cutting surface have different included angles, so that the rock crushing efficiency and the impact resistance are effectively improved; the upper part of the composite sheet is formed into a wedge-shaped angle, so that the composite sheet is easier to go deep into the stratum, and the rock breaking efficiency is improved.

Description

Polycrystalline diamond PDC (polycrystalline diamond compact) composite sheet with multiple cutting surfaces

Technical Field

The utility model relates to the technical field of petroleum and natural gas drilling, in particular to a polycrystalline diamond PDC (polycrystalline diamond compact) composite sheet with multiple cutting surfaces.

Background

At present, a large amount of PDC drill bits are used in geological exploration, exploitation and oil drilling, and the service life and the aggressivity of the PDC drill bits have a great relationship with the performance of a polycrystalline diamond compact. At present, in soft to medium-hardness strata, the conventional plane cutting teeth can well cut into the strata, so that higher drilling speed is obtained, but in hard strata, the conventional plane cutting teeth are difficult to cut into the strata, so that the aggressiveness is insufficient, and the drilling speed is lower; meanwhile, under the condition of high-speed rotation, the repeated impact between the cutting teeth and hard stratum and soft and hard staggered stratum easily causes the collapse loss of the conventional cutting teeth, and the service life of the drill bit is seriously influenced.

At present, a sharp-ridge cutting tooth can deeply bite into a stratum and simultaneously improve the shock resistance, but the sharp-ridge cutting tooth is sharp in head, easy to abrade and impact and damage and only can be used for a single stratum.

Therefore, in view of the above-mentioned drawbacks, the present inventors have conducted extensive research and design to overcome the above-mentioned drawbacks by designing a polycrystalline diamond PDC composite sheet with multiple cutting surfaces, which combines the experience and results of related industries for a long period of time.

SUMMERY OF THE UTILITY MODEL

The polycrystalline diamond PDC clad sheet with the multiple cutting surfaces is simple in structure, convenient to operate, capable of achieving impact resistance and aggressiveness, capable of effectively improving cutting effect and cutting efficiency, long in service life and wide in application range.

In order to achieve the purpose, the utility model discloses a polycrystalline diamond PDC (polycrystalline diamond compact) composite sheet with multiple cutting surfaces, which comprises a composite sheet body formed by a polycrystalline diamond layer and a hard alloy base, and is characterized in that:

it follows neutral face from preceding a plurality of forward cutting faces of back symmetrical arrangement in proper order and along the side direction cutting face that neutral face symmetry and arrange in pairs to be equipped with on the polycrystalline diamond layer, a plurality of forward cutting faces reduce in proper order from the past backward with the contained angle of compound piece body axis, side direction cutting face symmetry sets up in the both sides of an at least forward cutting face and is certain angle setting, thereby the front side of compound piece body is equipped with first scarf in pairs and second scarf at the head formation wedge angle of compound piece body, the lower extreme of first scarf and second scarf extends to the lateral wall or the bottom surface of compound piece body.

Wherein: the plurality of forward cutting surfaces comprise a first forward cutting surface, a second forward cutting surface and a third forward cutting surface, the plurality of pairs of lateral cutting surfaces are correspondingly positioned on two sides of the forward cutting surfaces and respectively comprise a first pair of lateral cutting surfaces, a second pair of lateral cutting surfaces and a third pair of lateral cutting surfaces, the first pair of lateral cutting surfaces comprise a first right lateral cutting surface and a first left lateral cutting surface which correspond to two sides of the first forward cutting surface, the second pair of lateral cutting surfaces comprise a second right lateral cutting surface and a second left lateral cutting surface which correspond to two sides of the second forward cutting surface, and the third pair of lateral cutting surfaces comprise a third right lateral cutting surface and a third left lateral cutting surface which correspond to two sides of the third forward cutting surface.

Wherein: the plurality of forward cutting faces includes a first forward cutting face, a second forward cutting face, and a third forward cutting face, the lateral cutting faces include a first pair of lateral cutting faces including a first right lateral cutting face and a first left lateral cutting face that correspond to either side of the first forward cutting face, and a second pair of lateral cutting faces including a second right lateral cutting face and a second left lateral cutting face that correspond to either side of the second forward cutting face or the third forward cutting face.

Wherein: the plurality of forward cutting faces includes a first forward cutting face and a second forward cutting face, and the lateral cutting faces includes a first right lateral cutting face and a first left lateral cutting face corresponding to both sides of the first forward cutting face.

Wherein: a circle of chamfer is arranged around the polycrystalline diamond layer, the size of the chamfer is 0-5mm, the angle of the chamfer is 0-90 degrees, and a positioning groove which is in the same direction as the neutral surface is arranged on the bottom surface of the composite sheet body.

Wherein: first scarf and second scarf mutual symmetry and from the top of compound piece body downward convergent and form the inverted cone column structure to form from the downward wedge angle that gradually widens of top at the head of compound piece body.

Wherein: the included angle is 60-120 degrees.

Wherein: the lateral cutting surface is connected with one of the positive cutting surfaces and correspondingly inclines for a certain angle which is 120-180 degrees, so that a wedge surface with a blunt end is formed to effectively disperse rock stress and improve rock breaking efficiency.

Wherein: the width of the positive cutting surface is 0.5-20 mm.

Wherein: the forward cutting face and the lateral cutting face are rectangular, hexagonal or trapezoidal.

From the above, the polycrystalline diamond PDC composite sheet with multiple cutting surfaces of the present invention has the following effects:

1. the wedge angle formed by the wedge surface can cut into the stratum and improve the attack of the drill bit.

2. By matching the forward cutting face and the lateral cutting face, the formation stress can be effectively dispersed, and the rock breaking efficiency is improved.

3. By adjusting the angle of the positive cutting surface, the state of zero back inclination angle of the cutting teeth can be realized, thereby greatly improving the aggressiveness of the drill bit.

4. By adjusting the angle of each positive cutting surface, the function that one drill bit is suitable for various stratums can be realized.

5. By adjusting the width of the positive cutting face, the aggressiveness and impact resistance of the composite sheet can be varied.

6. By adjusting the angle of the lateral cutting face, the aggressiveness and impact resistance of the composite sheet can be varied.

The details of the present invention can be obtained from the following description and the attached drawings.

Drawings

Fig. 1 illustrates a perspective view of a first embodiment of a multi-cutting face polycrystalline diamond PDC compact of the present invention.

Fig. 2 shows a right side view of a first embodiment of the utility model.

Fig. 3 shows a perspective view of a second embodiment of the present invention.

Fig. 4 shows a right side view of a second embodiment of the utility model.

Fig. 5 shows a perspective view of a third embodiment of the present invention.

Fig. 6 shows a left side view of embodiment three of the present invention.

Detailed Description

The following embodiments of the present invention will be further described with reference to the drawings and examples, which are only used to more clearly illustrate the technical solutions of the present invention, and should not be taken as limiting the scope of the present invention.

Referring to fig. 1 and 2, a first embodiment of a multi-faceted polycrystalline diamond PDC compact of the present invention is shown.

The polycrystalline diamond PDC compact with the multiple cutting surfaces comprises a compact body formed by a polycrystalline diamond layer 1 and a hard alloy base 2, wherein the polycrystalline diamond layer 1 is provided with a plurality of forward cutting surfaces which are sequentially and symmetrically arranged from front to back along a neutral plane and a plurality of pairs of lateral cutting surfaces which are symmetrically arranged along the neutral plane in pairs, in the illustrated embodiment, the plurality of forward cutting surfaces comprise a first forward cutting surface 3, a second forward cutting surface 4 and a third forward cutting surface 5, the plurality of pairs of lateral cutting surfaces are correspondingly positioned on two sides of the forward cutting surfaces and respectively comprise a first pair of lateral cutting surfaces, a second pair of lateral cutting surfaces and a third pair of lateral cutting surfaces, the first pair of lateral cutting surfaces comprise a first right lateral cutting surface 6 and a first left lateral cutting surface 7 which correspond to two sides of the first forward cutting surface 3, the second pair of lateral cutting surfaces comprise a second right lateral cutting surface 8 and a second left lateral cutting surface 9 which correspond to two sides of the second forward cutting surface 4, the third is to the lateral cutting face contains the third right lateral cutting face 10 and the third left lateral cutting face 11 that correspond 5 both sides of third forward cutting face, and the front side of compound piece body is equipped with mated first wedge 12 and second wedge 13 to head at compound piece body forms the wedge angle, the lower extreme of first wedge 12 and second wedge 13 extends to the lateral wall or the bottom surface of compound piece body, polycrystalline diamond layer 1 has round chamfer 14 around, the bottom surface of compound piece body is equipped with constant head tank 15 with the neutral plane syntropy, with regard as the location sign.

Wherein, first scarf 12 and second scarf 13 are symmetrical each other and connect respectively in first right lateral cutting face 6 and first left lateral cutting face 7, first scarf 12 and second scarf 13 taper downwards from the top of compound piece body, form the inverted cone structure as shown in the figure to form the wedge angle of following the downward gradually wide of top at the head of compound piece body.

Referring to fig. 2, included angles between the first forward cutting surface 3, the second forward cutting surface 4 and the third forward cutting surface 5 and an axis of the composite sheet body are a first included angle c, a second included angle b and a third included angle a which are sequentially reduced, the included angles of the first included angle c, the second included angle b and the third included angle a are 60-120 degrees, as the included angles are increased, the aggressivity is gradually enhanced, and the impact resistance is gradually reduced.

When the polycrystalline diamond PDC composite sheet with the multiple cutting surfaces works, the tooth crest surface firstly contacts with the stratum, and the composite sheet can be deeply cut into the stratum due to the existence of the wedge angle. When the drill bit rotates, the first forward cutting face is matched with the first pair of lateral cutting faces, the formation stress is dispersed, and rock debris is dispersed to two sides and cannot be cut secondarily, so that the rock breaking efficiency is improved. When the drill bit drills to a second stratum, the first positive cutting face of the composite sheet is abraded, the second positive cutting face enters a working state, the angle of the second positive cutting face can be adjusted according to the conditions of the second stratum, the whole drill bit can still drill quickly, and a third stratum can work with a third positive cutting face in a similar manner.

Wherein the first right lateral cutting face 6 and the first left lateral cutting face 7 are connected with the first positive cutting face 3 and are correspondingly inclined by a first angle which is 180 DEG plus 120 DEG and can effectively disperse the stress of the cutting tooth during rock breaking and improve the impact resistance of the cutting tooth, the second right lateral cutting face 8 and the second left lateral cutting face 9 are connected with the second positive cutting face 4 and are correspondingly inclined by a second angle which is 180 DEG plus 120 DEG and can effectively disperse the stress of the cutting tooth during rock breaking and improve the impact resistance of the cutting tooth, the third right lateral cutting face 10 and the third left lateral cutting face 11 are connected with the third positive cutting face 5 and are correspondingly inclined by a third angle which is 180 DEG plus 120 DEG and can effectively disperse the stress of the cutting tooth during rock breaking and improve the impact resistance of the cutting tooth, and the wedge faces of the lateral cutting faces and the positive cutting faces are provided with blunt heads, the wedge surface can effectively disperse rock stress and improve rock breaking efficiency.

Referring to fig. 3 and 4, a second embodiment of the multi-faceted polycrystalline diamond PDC compact of the present invention is shown.

The second embodiment differs from the first embodiment in that the second embodiment is provided with three forward cutting faces and two pairs of lateral cutting faces, which also comprise a first forward cutting face, a second forward cutting face and a third forward cutting face arranged in sequence, the pairs of lateral cutting faces comprise a first pair of lateral cutting faces comprising a first right lateral cutting face and a first left lateral cutting face corresponding to both sides of the first forward cutting face, and a second pair of lateral cutting faces comprising a second right lateral cutting face and a second left lateral cutting face corresponding to both sides of the second forward cutting face (and also corresponding to the third forward cutting face), and no lateral cutting face is present on both sides of the third forward cutting face 5.

Referring to fig. 5 and 6, a third embodiment of a multi-faceted polycrystalline diamond PDC compact of the present invention is shown.

In a third embodiment, the cutting tool has two forward cutting faces and a pair of lateral cutting faces, the plurality of forward cutting faces includes a first forward cutting face and a second forward cutting face, and the lateral cutting faces includes a first right lateral cutting face and a first left lateral cutting face corresponding to both sides of the first forward cutting face.

Wherein, the chamfer 14 is an impact-resistant chamfer with the size of 0-5mm and the angle of 0-90 degrees. The size and the angle can be larger when the stratum has strong impact, and the size and the angle can be smaller or even zero when the stratum has weak impact.

Wherein the width of the positive cutting face is 0.5-20mm, the width of each positive cutting face can be constant or variable from the wedge angle downwards, the depth of the cutting face into the stratum is reduced along with the increase of the width, the impact resistance is enhanced, and the service life is prolonged.

When there are only three positive cutting faces and two pairs of lateral cutting faces, the second pair of lateral cutting faces may be angled with respect to the second positive cutting face or with respect to the third positive cutting face.

According to the scheme, the plurality of positive cutting faces can be designed into various included angles according to stratum layering, so that the cutting tool is suitable for various stratums.

According to the scheme, the forward cutting face and the lateral cutting face can be in various shapes such as rectangle, hexagon and trapezoid.

Therefore, the polycrystalline diamond PDC compact with the multiple cutting surfaces comprises the multiple positive cutting surfaces and the multiple pairs of lateral cutting surfaces, the multiple positive cutting surfaces are symmetrically distributed along a neutral surface and are sequentially connected and arranged, and each positive cutting surface has a different inclination angle, so that different aggressivity and impact resistance are provided; aiming at different lithologies, a plurality of pairs of symmetrically arranged lateral cutting faces and the forward cutting face have different included angles, so that the rock crushing efficiency and the impact resistance are effectively improved; the first pair of lateral cutting surfaces of the composite sheet is connected with the pair of wedge surfaces, so that the upper part of the composite sheet forms a wedge angle which is easy to be absorbed into a stratum, and the rock breaking efficiency is improved; and a circle of impact-resistant chamfer is added on the outer ring of the polycrystalline diamond PDC composite sheet, so that the impact resistance of the composite sheet is improved.

It should be apparent that the foregoing description and illustrations are by way of example only and are not intended to limit the present disclosure, application or uses. While embodiments have been described in the embodiments and depicted in the drawings, the present invention is not limited to the particular examples illustrated by the drawings and described in the embodiments as the best mode presently contemplated for carrying out the teachings of the present invention, and the scope of the present invention will include any embodiments falling within the foregoing description and the appended claims.

Claims

1. The utility model provides a many cutting faces polycrystalline diamond PDC compact, includes the compact body that is formed by polycrystalline diamond layer and carbide base, its characterized in that:

2. The multi-cutting face polycrystalline diamond PDC compact of claim 1, wherein: the plurality of forward cutting surfaces comprise a first forward cutting surface, a second forward cutting surface and a third forward cutting surface, the plurality of pairs of lateral cutting surfaces are correspondingly positioned on two sides of the forward cutting surfaces and respectively comprise a first pair of lateral cutting surfaces, a second pair of lateral cutting surfaces and a third pair of lateral cutting surfaces, the first pair of lateral cutting surfaces comprise a first right lateral cutting surface and a first left lateral cutting surface which correspond to two sides of the first forward cutting surface, the second pair of lateral cutting surfaces comprise a second right lateral cutting surface and a second left lateral cutting surface which correspond to two sides of the second forward cutting surface, and the third pair of lateral cutting surfaces comprise a third right lateral cutting surface and a third left lateral cutting surface which correspond to two sides of the third forward cutting surface.

3. The multi-cutting face polycrystalline diamond PDC compact of claim 1, wherein: the plurality of forward cutting faces includes a first forward cutting face, a second forward cutting face, and a third forward cutting face, the lateral cutting faces include a first pair of lateral cutting faces including a first right lateral cutting face and a first left lateral cutting face that correspond to either side of the first forward cutting face, and a second pair of lateral cutting faces including a second right lateral cutting face and a second left lateral cutting face that correspond to either side of the second forward cutting face or the third forward cutting face.

4. The multi-cutting face polycrystalline diamond PDC compact of claim 1, wherein: the plurality of forward cutting faces includes a first forward cutting face and a second forward cutting face, and the lateral cutting faces includes a first right lateral cutting face and a first left lateral cutting face corresponding to both sides of the first forward cutting face.

5. The multi-faceted polycrystalline diamond PDC compact of any one of claims 1 to 4, wherein: a circle of chamfer is arranged around the polycrystalline diamond layer, the size of the chamfer is 0-5mm, the angle of the chamfer is 0-90 degrees, and a positioning groove which is in the same direction as the neutral surface is arranged on the bottom surface of the composite sheet body.

6. The multi-faceted polycrystalline diamond PDC compact of any one of claims 1 to 4, wherein: first scarf and second scarf mutual symmetry and from the top of compound piece body downward convergent and form the inverted cone column structure to form from the downward wedge angle that gradually widens of top at the head of compound piece body.

7. The multi-faceted polycrystalline diamond PDC compact of any one of claims 1 to 4, wherein: the included angle is 60-120 degrees.

8. The multi-faceted polycrystalline diamond PDC compact of any one of claims 1 to 4, wherein: the lateral cutting surface is connected with one of the positive cutting surfaces and correspondingly inclines for a certain angle which is 120-180 degrees, so that a wedge surface with a blunt end is formed to effectively disperse rock stress and improve rock breaking efficiency.

9. The multi-faceted polycrystalline diamond PDC compact of any one of claims 1 to 4, wherein: the width of the positive cutting surface is 0.5-20 mm.

10. The multi-faceted polycrystalline diamond PDC compact of any one of claims 1 to 4, wherein: the forward cutting face and the lateral cutting face are rectangular, hexagonal or trapezoidal.