CN113006705B - Special-shaped polycrystalline diamond compact with secondary crushing function - Google Patents
Special-shaped polycrystalline diamond compact with secondary crushing function Download PDFInfo
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- CN113006705B CN113006705B CN202110333646.1A CN202110333646A CN113006705B CN 113006705 B CN113006705 B CN 113006705B CN 202110333646 A CN202110333646 A CN 202110333646A CN 113006705 B CN113006705 B CN 113006705B
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B10/00—Drill bits
- E21B10/46—Drill bits characterised by wear resisting parts, e.g. diamond inserts
- E21B10/54—Drill bits characterised by wear resisting parts, e.g. diamond inserts the bit being of the rotary drag type, e.g. fork-type bits
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B10/00—Drill bits
- E21B10/42—Rotary drag type drill bits with teeth, blades or like cutting elements, e.g. fork-type bits, fish tail bits
- E21B10/43—Rotary drag type drill bits with teeth, blades or like cutting elements, e.g. fork-type bits, fish tail bits characterised by the arrangement of teeth or other cutting elements
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B10/00—Drill bits
- E21B10/60—Drill bits characterised by conduits or nozzles for drilling fluids
- E21B10/602—Drill bits characterised by conduits or nozzles for drilling fluids the bit being a rotary drag type bit with blades
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B10/00—Drill bits
- E21B10/62—Drill bits characterised by parts, e.g. cutting elements, which are detachable or adjustable
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- Life Sciences & Earth Sciences (AREA)
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Abstract
The invention provides a special-shaped polycrystalline diamond compact with a secondary crushing function, which comprises a hard alloy matrix and a polycrystalline diamond layer, wherein one end of the polycrystalline diamond layer is fixedly connected with the hard alloy matrix, a groove is formed in the middle of the other end of the polycrystalline diamond layer, the other end of the polycrystalline diamond layer surrounds the groove to form a raised cutting part, a chip rolling groove arranged around the groove is formed at the joint of the cutting part and the groove, a raised crushing part I is arranged at the bottom of the groove, the cross section of the chip rolling groove is of an arc-shaped structure, and a raised crushing part II is arranged at the bottom of the chip rolling groove.
Description
Technical Field
The invention belongs to the field of petroleum and natural gas drilling, and particularly relates to a high-efficiency rock breaking PDC composite sheet which can improve rock breaking efficiency in both a soft stratum and a hard stratum and has a secondary breaking function.
Background
The drilling engineering is an important link of the exploration and development of oil and gas resources, is a key of the efficient and safe development of the oil and gas resources, and an important research direction in the field of petroleum and natural gas is how to improve the drilling efficiency and save the drilling cost. The excellent performance of the drill bit as the essential key technical equipment for breaking rock and forming a shaft in the drilling engineering directly determines the drilling efficiency and the economic cost.
The PDC drill bit has the advantages of high mechanical drilling speed, long drill bit footage service life and the like. At present, a diamond composite sheet used by a common PDC drill bit for petroleum drilling is generally a rotary cylindrical tooth, the surface of the diamond composite sheet is a plane tooth surface, and when the PDC drill bit adopting the composite sheet is drilled in a hard stratum, a diamond polycrystalline layer is rapidly heated and burnt to generate collapse abrasion, so that the service life of the drill bit is finally shortened.
With the increasing demand of drilling speed and efficiency and the progress of the manufacturing technology of the PDC composite sheet, more manufacturers transfer the mode of improving and optimizing the PDC drill bit to the special-shaped composite sheet. The specially-shaped composite sheet of the Beckhoss has a structure similar to a metal cutting chip breaker, and can help to reduce cutting force required by rock breaking, so that the rock breaking efficiency is improved, but when the specially-shaped composite sheet is applied to a hard stratum, the service life of the composite sheet can be reduced due to the chip breaker structure. The axe-shaped tooth of smith and the raised wedge-shaped structure can increase the efficiency of the composite sheet when the composite sheet is used for crushing hard strata, but the application effect in plastic strata is not obvious.
Therefore, various stratums applied by the drill bit need to be fully considered, and the PDC composite sheet capable of improving the rock breaking efficiency in a soft stratum and the rock breaking efficiency in a hard stratum is designed, so that the rock breaking efficiency of drilling is improved, and the drilling cost is reduced.
Disclosure of Invention
Aiming at the problems pointed out in the background technology, the invention provides a special-shaped polycrystalline diamond compact with a secondary crushing function, so that the rock breaking efficiency of drilling is improved, and the drilling cost is reduced.
The technical scheme of the invention is realized as follows:
the utility model provides a dysmorphism polycrystalline diamond compact with secondary crushing function, includes carbide base member and polycrystalline diamond layer, the one end and the carbide base member fixed connection of polycrystalline diamond layer, the middle part of the other end of polycrystalline diamond layer is equipped with the recess, the other end on polycrystalline diamond layer encircles the recess form bellied cutting part, the junction of cutting part and recess form and encircle the chip groove that the recess set up, the bottom of recess be equipped with bellied broken portion one.
The chip groove is further provided with a circular arc-shaped cross section, and the bottom of the chip groove is provided with a second raised crushing part.
The crushing part II is a convex edge arranged along the circumferential direction of the chip rolling groove, an included angle between the outer side surface of the convex edge and the wall of the chip rolling groove is an acute angle, and an included angle between the inner side surface of the convex edge and the wall of the chip rolling groove is an obtuse angle.
The crushing part II is formed by arranging a through hole penetrating through one end of the polycrystalline diamond layer on the chip rolling groove, arranging a convex column corresponding to the through hole on the hard alloy substrate, wherein the convex column extends into the through hole and is arranged from the wall protruding out of the chip rolling groove, and the convex column protruding out of the wall of the chip rolling groove forms the crushing part II.
The invention is further arranged that the first crushing part is in a strip shape, one end of the first crushing part is the central position of the groove, and the other end of the first crushing part extends to be connected with the cutting part or the chip groove.
The invention is further provided with at least two first crushing parts which are uniformly distributed in the circumferential direction.
The invention is further provided that the first crushing part is in a conical structure with a narrow outer side and a wide inner side.
The invention is further arranged that the cutting part is provided with a cutting edge arranged around the groove.
The invention is further arranged that the distance from the cutting edge to the edge of the cutting part is 1-4 mm.
The hard alloy substrate and the polycrystalline diamond layer are designed into cylindrical structures, and the thickness of the polycrystalline diamond layer is 1.5-4 mm.
By adopting the technical scheme, the invention has the beneficial effects that:
the special-shaped polycrystalline diamond compact with the secondary crushing function can roll up cut rock debris along the chip reeling groove, and the rock debris entering the chip reeling groove can be more easily curled and broken by matching with the second crushing part in the chip reeling groove, and the first crushing part can separate and secondarily crush the rock debris and large-particle rock debris, so that the rock breaking efficiency is improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a schematic view of a flute of the present invention having a ridge;
FIG. 2 is a cross-sectional view of the present invention with a ridge disposed in the chip groove;
FIG. 3 is a schematic view of a convex pillar disposed in a chip groove of the present invention;
FIG. 4 is an exploded view of the present invention illustrating a convex post disposed in a chip groove;
FIG. 5 is a cross-sectional view of the present invention with a post disposed in the flute;
FIG. 6 shows an embodiment of the present invention where the number of the crushing parts is 3 and the height of the crushing part is lower than that of the cutting edge;
FIG. 7 shows an embodiment of the present invention where the number of the crushing parts is 2 and the height of the crushing part is lower than that of the cutting edge;
FIG. 8 shows an embodiment of the present invention in which the number of the crushing parts is 4 and the height of the crushing part is lower than that of the cutting edge;
FIG. 9 shows an embodiment of the present invention in which the number of the crushing parts is 5 and the height of the crushing part is lower than that of the cutting edge;
FIG. 10 shows an embodiment of the present invention where the number of the crushing parts is 2 and the height of the crushing part is equal to the height of the cutting edge;
FIG. 11 shows an embodiment of the present invention where the number of the crushing parts is 2 and the height of the crushing part is higher than that of the cutting edge;
FIG. 12 is an embodiment of the present invention with a cutting edge angle of 0 and a breaker portion height below the cutting edge height;
FIG. 13 shows an embodiment of the present invention in which the cutting edge has a negative rake angle and the height of the breaker portion is less than the height of the cutting edge;
FIG. 14 shows an embodiment of the present invention in which the cutting edge is a positive rake angle and the height of the breaker portion is less than the height of the cutting edge;
FIG. 15 is a schematic illustration of the invention as applied to hard formation drilling;
FIG. 16 is a schematic illustration of the invention as applied to soft formation drilling;
FIG. 17 is a graph illustrating the effect of the invention on a PDC bit.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention is described below with reference to fig. 1-17:
the utility model provides a dysmorphism polycrystalline diamond compact with secondary crushing function, includes cylindrical carbide base member 1 and cylindrical polycrystalline diamond layer 2, polycrystalline diamond layer 2's one end and carbide base member 1 fixed connection.
The center of the other end of the polycrystalline diamond layer 2 is provided with a groove 3, and the groove 3 and the polycrystalline diamond layer 2 are coaxially arranged.
The other end of the polycrystalline diamond layer 2 surrounds the groove 3 to form a convex cutting part 4.
The joint of the cutting part 4 and the groove 3 forms a chip groove 5 arranged around the groove 3.
The bottom of the groove 3 is provided with a raised crushing part I7.
The chip flutes 5 can be designed as arc-shaped structures or as planar structures.
During cutting, the cutting part 4 performs cutting operation on the stratum, generated chips enter the groove along the chip reeling groove, continuous chips can be broken, the crushing part can perform secondary crushing treatment on large-particle chips, and finally the chips are discharged from one side of the groove.
The section of the chip reeling groove 5 is of a circular arc structure, and the bottom of the chip reeling groove 5 is provided with a second raised crushing part 8. The chip coiling grooves 5 with the arc-shaped structures can form certain restraint on chips, and the crushing speed of the chip coiling can be accelerated by matching with the crushing part II 8.
As shown in fig. 1-2, the second crushing portion 8 is a rib 81 disposed along the circumferential direction of the chip rolling groove 5, an included angle between the outer side surface of the rib 81 and the wall of the chip rolling groove 5 is an acute angle, and an included angle between the inner side surface of the rib 81 and the wall of the chip rolling groove 5 is an obtuse angle. This angle mechanism sets up, can reduce the power that the bead received, does benefit to the discharge of the broken piece of a crushing portion secondary, reduces the resistance.
As shown in fig. 3-5, the second crushing portion 8 is a chip groove 5 provided with a through hole 9 penetrating through one end of the polycrystalline diamond layer 2, the cemented carbide substrate 1 is provided with a convex column 82 corresponding to the through hole 9, the convex column 82 extends into the through hole 9 and is arranged to protrude from the wall of the chip groove 5, and the convex column 82 protruding from the wall of the chip groove 5 forms the second crushing portion 8. The convex columns 82 and the through holes 9 are beneficial to enhancing the strength of the connection structure of the hard alloy matrix 1 and the polycrystalline diamond layer 2, and meanwhile, the convex columns 82 can also accelerate the breaking speed of the coiled scraps.
The first crushing part 7 is in a strip shape, one end of the first crushing part 7 is the central position of the groove 3, and the other end of the first crushing part 7 extends to be connected with the cutting part 4 or the chip rolling groove 5.
Wherein, the crushing portion 7 is provided with two at least, and the crushing portion 7 is evenly distributed in the circumferential direction.
Wherein, the first crushing part 7 is a conical structure with a narrow outer side and a wide inner side.
Wherein, the cutting part 4 is provided with a cutting edge 10 surrounding the groove 3.
Wherein the distance from the cutting edge 10 to the edge of the cutting part 4 is 1-4 mm.
The hard alloy substrate 1 and the polycrystalline diamond layer 2 are both designed into cylindrical structures, and the thickness of the polycrystalline diamond layer 2 is 1.5-4 mm.
By adopting the technical scheme, the invention has the beneficial effects that:
the special-shaped polycrystalline diamond compact with the secondary crushing function can roll up cut rock debris along the chip reeling groove 5, and the rock debris entering the chip reeling groove 5 can be more easily curled and broken by matching with the second crushing part 8 in the chip reeling groove 5, and the first crushing part 7 can separate and secondarily crush the rock debris and large-particle rock debris, so that the rock breaking efficiency is improved.
Other beneficial effects of the invention are as follows:
1. the cuttings pocket 5 can be rolled up the cut cuttings, so that the cuttings are curled and broken, and the large-particle cuttings are secondarily crushed through the protruded crushing part 7, so that the separation of the cuttings and the secondary crushing of the large-particle cuttings are realized.
2. The internal stress that the recess produced in can reducing polycrystalline diamond layer 2 synthetic process to guaranteed the unobstructed of chip removal passageway, played the effect of strengthening compound piece structural strength, improvement chip removal passageway efficiency.
3. Protruding crushing portion 7 can strengthen the structural strength of compound piece on the one hand, and on the other hand can carry out the secondary crushing with large granule detritus, reduces cutting force, improves cutting efficiency. The first crushing parts 7 which are not less than 1 are arranged, so that after one first crushing part 7 is abraded, the first crushing part 7 on the other side continues to play a role by rotating the composite sheet, and the composite sheet can continue to efficiently break rocks.
4. When drilling in a hard formation, the cutting edge is designed to be a negative rake angle, the edge distance of the cutting edge is increased, and the height of the first crushing part 7 is equal to or higher than that of the cutting edge, so that the cutting depth can be reduced, the cutting force is increased, and the cutting efficiency and the impact resistance of the composite sheet in the drilling of the hard formation are improved;
5. when drilling in a soft stratum, the cutting edge is designed to be a positive rake angle, the edge distance of the cutting edge is reduced, and the height of the first crushing part 7 is lower than that of the cutting edge, so that the cutting depth can be increased, the cutting force is reduced, and the cutting efficiency and the impact resistance of the composite sheet in the soft stratum drilling process are improved.
The application provides a dysmorphism polycrystalline diamond compact can design into multiple implementation mode:
example 1
Fig. 6 is an isometric view of one embodiment of the invention, including a polycrystalline diamond layer 2 and a cemented carbide substrate 1. The upper surface of polycrystalline diamond layer 2 is equipped with chip groove 5, broken portion 7, cutting edge 10, recess 3. The characteristics and functions of each part are as follows:
the chip reeling groove 5 is an inclined plane (the chip reeling groove 5 can be designed into a cambered surface structure or a plane structure), the included angle between the chip reeling groove 5 and the horizontal plane is 15-30 degrees, and cut rock debris can be rolled up to be curled and broken;
the number that crushing portion 7 set up is 3, can strengthen the structural strength of compound piece on the one hand, and on the other hand can carry out the secondary crushing with large granule detritus, reduces the cutting force, improves cutting efficiency. When the first crushing part on one side is abraded, the first crushing part on the other side can continue to play a role by rotating the composite sheet.
The cutting rake angle of the cutting edge 10 is 0 °, and the height of the first crushed portion 7 is lower than that of the cutting edge 10.
The composite sheet in the embodiment can be simultaneously suitable for drilling in soft and hard stratums, so that the rock breaking efficiency of the drilling well under the condition of a complex stratum is improved, and the drilling cost is reduced.
Example 2
Fig. 7 is an isometric view of another embodiment of the invention, including a polycrystalline diamond layer 2 and a cemented carbide substrate 1. The upper surface of the polycrystalline diamond layer comprises a chip rolling groove 5, a first crushing part 7, a cutting edge 10 and a groove 3. The characteristics and functions of each part are as follows:
the included angle between the chip rolling groove 5 and the horizontal plane is 15-30 degrees, so that cut rock debris can be rolled up to be curled and broken;
the number that crushing portion 7 set up is 2, can strengthen the structural strength of compound piece on the one hand, and on the other hand can carry out the secondary crushing with large granule detritus, reduces the cutting force, improves cutting efficiency. When the first crushing part on one side is abraded, the first crushing part on the other side can continue to play a role by rotating the composite sheet.
The cutting rake angle of the cutting edge 10 is 0 °, and the height of the first crushed portion 7 is lower than that of the cutting edge 10.
The composite sheet in the embodiment can be simultaneously suitable for drilling in soft and hard stratums, so that the rock breaking efficiency of the drilling well under the condition of a complex stratum is improved, and the drilling cost is reduced.
Example 3
Fig. 8 is an isometric view of another embodiment of the invention, including a polycrystalline diamond layer 2 and a cemented carbide substrate 1. The upper surface of the polycrystalline diamond layer comprises a chip rolling groove 5, a first crushing part 7, a cutting edge 10 and a groove 3. The characteristics and functions of each part are as follows:
the included angle between the chip rolling groove 5 and the horizontal plane is 15-30 degrees, so that cut rock debris can be rolled up to be curled and broken;
the number that crushing portion 7 set up is 4, can strengthen the structural strength of compound piece on the one hand, and on the other hand can carry out the secondary crushing with large granule detritus, reduces the cutting force, improves cutting efficiency. When the first crushing part on one side is abraded, the first crushing part on the other side can continue to play a role by rotating the composite sheet.
The cutting rake angle of the cutting edge 10 is 0 °, and the height of the first crushed portion 7 is lower than that of the cutting edge 10.
The composite sheet in the embodiment can be simultaneously suitable for drilling in soft and hard stratums, so that the rock breaking efficiency of the drilling well under the condition of a complex stratum is improved, and the drilling cost is reduced.
Example 4
Fig. 9 is an isometric view of another embodiment of the invention, including a polycrystalline diamond layer 2 and a cemented carbide substrate 1. The upper surface of the polycrystalline diamond layer comprises a chip rolling groove 5, a first crushing part 7, a cutting edge 10 and a groove 3. The characteristics and functions of each part are as follows:
the included angle between the chip rolling groove 5 and the horizontal plane is 15-30 degrees, so that cut rock debris can be rolled up to be curled and broken;
the number that crushing portion 7 set up is 5, can strengthen the structural strength of compound piece on the one hand, and on the other hand can carry out the secondary crushing with large granule detritus, reduces the cutting force, improves cutting efficiency. When the first crushing part on one side is abraded, the first crushing part on the other side can continue to play a role by rotating the composite sheet.
The cutting rake angle of the cutting edge 10 is 0 °, and the height of the first crushed portion 7 is lower than that of the cutting edge 10.
The composite sheet in the embodiment can be simultaneously suitable for drilling in soft and hard stratums, so that the rock breaking efficiency of the drilling well under the condition of a complex stratum is improved, and the drilling cost is reduced.
Example 5
Fig. 10 is an isometric view of another embodiment of the invention, including a polycrystalline diamond layer 2 and a cemented carbide substrate 1. The upper surface of the polycrystalline diamond layer comprises a chip rolling groove 5, a first crushing part 7, a cutting edge 10 and a groove 3. The characteristics and functions of each part are as follows:
the included angle between the chip rolling groove 5 and the horizontal plane is 15-30 degrees, so that cut rock debris can be rolled up to be curled and broken;
the number that crushing portion 7 set up is 2, can strengthen the structural strength of compound piece on the one hand, and on the other hand can carry out the secondary crushing with large granule detritus, reduces the cutting force, improves cutting efficiency. When the first crushing part on one side is abraded, the first crushing part on the other side can continue to play a role by rotating the composite sheet.
The cutting rake angle of the cutting edge 10 is 0 deg., and the height of the first crushed portion 7 is equal to the height of the cutting edge 10.
The composite sheet in the embodiment can be simultaneously suitable for drilling in soft and hard stratums, so that the rock breaking efficiency of the drilling well under the condition of a complex stratum is improved, and the drilling cost is reduced.
Example 6
Fig. 11 is an isometric view of another embodiment of the invention, including a polycrystalline diamond layer 2 and a cemented carbide substrate 1. The upper surface of the polycrystalline diamond layer comprises a chip rolling groove 5, a first crushing part 7, a cutting edge 10 and a groove 3. The characteristics and functions of each part are as follows:
the included angle between the chip rolling groove 5 and the horizontal plane is 15-30 degrees, so that cut rock debris can be rolled up to be curled and broken;
the number that crushing portion 7 set up is 2, and the tip of crushing portion 7 extends to and is connected with the cutting portion intersection, can strengthen the structural strength of compound piece on the one hand, and on the other hand can carry out the secondary crushing with large granule detritus, reduces the cutting force, improves cutting efficiency. When the first crushing part on one side is abraded, the first crushing part on the other side can continue to play a role by rotating the composite sheet.
The cutting rake angle of the cutting edge 10 is 0 °, and the height of the first crushed portion 7 is higher than that of the cutting edge 10.
The composite sheet in the embodiment can be simultaneously suitable for drilling in soft and hard stratums, so that the rock breaking efficiency of the drilling well under the condition of a complex stratum is improved, and the drilling cost is reduced.
Example 7
Fig. 12 is a cross-sectional view of an embodiment of the present invention, which includes a polycrystalline diamond layer 2 and a cemented carbide substrate 1. The upper surface of the polycrystalline diamond layer comprises a chip rolling groove 5, a first crushing part 7, a cutting edge 10 and a groove 3. The characteristics and functions of each part are as follows:
the included angle between the chip rolling groove 5 and the horizontal plane is 15-30 degrees, so that cut rock debris can be rolled up to be curled and broken;
the structural strength of compound piece can be strengthened on the one hand to the setting of crushing portion 7, and on the other hand can carry out the secondary crushing with large granule detritus, reduces the cutting force, improves cutting efficiency. When the first crushing part on one side is abraded, the first crushing part on the other side can continue to play a role by rotating the composite sheet.
The arrangement of the groove 3 can strengthen the structural strength of the composite sheet and improve the efficiency of the chip removal channel.
The cutting rake angle of the cutting edge 10 is 0 °, and the height of the first crushed portion 7 is lower than that of the cutting edge 10.
The composite sheet in the embodiment can be simultaneously suitable for drilling in soft and hard stratums, so that the rock breaking efficiency of the drilling well under the condition of a complex stratum is improved, and the drilling cost is reduced.
Example 8
Fig. 13 is a cross-sectional view of another embodiment of the present invention, which includes a polycrystalline diamond layer 2 and a cemented carbide substrate 1. The upper surface of the polycrystalline diamond layer comprises a chip rolling groove 5, a first crushing part 7, a cutting edge 10 and a groove 3. The characteristics and functions of each part are as follows:
the included angle between the chip rolling groove 5 and the horizontal plane is 15-30 degrees, so that cut rock debris can be rolled up to be curled and broken;
the structural strength of compound piece can be strengthened on the one hand to the setting of crushing portion 7, and on the other hand can carry out the secondary crushing with large granule detritus, reduces the cutting force, improves cutting efficiency. When the first crushing part on one side is abraded, the first crushing part on the other side can continue to play a role by rotating the composite sheet.
The arrangement of the groove 3 can strengthen the structural strength of the composite sheet and improve the efficiency of the chip removal channel.
The cutting rake angle of the cutting edge 10 is a negative rake angle, and the height of the crushing part one 7 is lower than that of the cutting edge 10.
The composite sheet in the embodiment can be simultaneously suitable for drilling in soft and hard stratums, so that the rock breaking efficiency of the drilling well under the condition of a complex stratum is improved, and the drilling cost is reduced.
Example 9
Fig. 14 is a cross-sectional view of another embodiment of the present invention, which includes a polycrystalline diamond layer 2 and a cemented carbide substrate 1. The upper surface of the polycrystalline diamond layer comprises a chip rolling groove 5, a first crushing part 7, a cutting edge 10 and a groove 3. The characteristics and functions of each part are as follows:
the included angle between the chip rolling groove 5 and the horizontal plane is 15-30 degrees, so that cut rock debris can be rolled up to be curled and broken;
the structural strength of compound piece can be strengthened on the one hand to the setting of crushing portion 7, and on the other hand can carry out the secondary crushing with large granule detritus, reduces the cutting force, improves cutting efficiency. When the first crushing part on one side is abraded, the first crushing part on the other side can continue to play a role by rotating the composite sheet.
The arrangement of the groove 3 can strengthen the structural strength of the composite sheet and improve the efficiency of the chip removal channel.
The cutting rake angle of the cutting edge 10 is a positive rake angle, and the height of the crushing portion one 7 is lower than that of the cutting edge 10.
The composite sheet in the embodiment can be simultaneously suitable for drilling in soft and hard stratums, so that the rock breaking efficiency of the drilling well under the condition of a complex stratum is improved, and the drilling cost is reduced.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (8)
1. The utility model provides a dysmorphism polycrystalline diamond compact with secondary crushing function which characterized in that: the polycrystalline diamond cutting tool comprises a hard alloy matrix and a polycrystalline diamond layer, wherein one end of the polycrystalline diamond layer is fixedly connected with the hard alloy matrix, a groove is formed in the middle of the other end of the polycrystalline diamond layer, the other end of the polycrystalline diamond layer surrounds the groove to form a raised cutting part, a chip rolling groove arranged around the groove is formed at the joint of the cutting part and the groove, and a raised crushing part I is arranged at the bottom of the groove;
the section of the chip reeling groove is of an arc-shaped structure, and a second raised crushing part is arranged at the bottom of the chip reeling groove;
broken portion two be the bead that sets up along chip groove circumference, the lateral surface of bead and the contained angle between the wall of chip groove be the acute angle, the medial surface of bead and the contained angle between the wall of chip groove be the obtuse angle.
2. The special-shaped polycrystalline diamond compact with the secondary crushing function of claim 1, wherein: the chip coiling groove is provided with a through hole penetrating through one end of the polycrystalline diamond layer, the hard alloy matrix is provided with a convex column corresponding to the through hole, the convex column extends into the through hole and is arranged on the wall protruding out of the chip coiling groove, and the convex column protruding out of the chip coiling groove wall forms a second crushing part.
3. The special-shaped polycrystalline diamond compact with the secondary crushing function according to claim 1 or 2, wherein: the first crushing part is in a strip shape, one end of the first crushing part is the central position of the groove, and the other end of the first crushing part extends to be connected with the cutting part or the chip groove.
4. The special-shaped polycrystalline diamond compact with the secondary crushing function according to claim 3, wherein: the first crushing parts are at least provided with two, and the first crushing parts are uniformly distributed in the circumferential direction.
5. The special-shaped polycrystalline diamond compact with the secondary crushing function according to claim 4, wherein: the first crushing part is of a conical structure with a narrow outer side and a wide inner side.
6. The special-shaped polycrystalline diamond compact with the secondary crushing function according to claim 4, wherein: the cutting part is provided with a cutting edge surrounding the groove.
7. The special-shaped polycrystalline diamond compact with the secondary crushing function according to claim 6, wherein: the distance from the cutting edge to the edge of the cutting part is 1-4 mm.
8. The special-shaped polycrystalline diamond compact with the secondary crushing function according to claim 4, wherein: the hard alloy substrate and the polycrystalline diamond layer are both designed into cylindrical structures, and the thickness of the polycrystalline diamond layer is 1.5-4 mm.
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| CN202110333646.1A CN113006705B (en) | 2021-03-29 | 2021-03-29 | Special-shaped polycrystalline diamond compact with secondary crushing function |
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| CN202110333646.1A CN113006705B (en) | 2021-03-29 | 2021-03-29 | Special-shaped polycrystalline diamond compact with secondary crushing function |
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| CN113006705B true CN113006705B (en) | 2022-03-22 |
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Citations (14)
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