WO2020076358A1 - Dent de coupe non plane de type à arête convexe et trépan au diamant - Google Patents

Dent de coupe non plane de type à arête convexe et trépan au diamant Download PDF

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Publication number
WO2020076358A1
WO2020076358A1 PCT/US2019/021028 US2019021028W WO2020076358A1 WO 2020076358 A1 WO2020076358 A1 WO 2020076358A1 US 2019021028 W US2019021028 W US 2019021028W WO 2020076358 A1 WO2020076358 A1 WO 2020076358A1
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WO
WIPO (PCT)
Prior art keywords
drill bit
cutting
bit body
cutting teeth
water channel
Prior art date
Application number
PCT/US2019/021028
Other languages
English (en)
Inventor
Javier Davila
Liang Zhao
Xiaomin Chen
Demin Chen
Xiongwen Yang
Yonghong Wang
Yu Liu
Original Assignee
Cnpc Usa Corporation
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from US16/155,359 external-priority patent/US10563464B2/en
Application filed by Cnpc Usa Corporation filed Critical Cnpc Usa Corporation
Priority to BR112021006683-7A priority Critical patent/BR112021006683A2/pt
Publication of WO2020076358A1 publication Critical patent/WO2020076358A1/fr

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Classifications

    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK 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
    • E21B10/56—Button-type inserts
    • E21B10/567—Button-type inserts with preformed cutting elements mounted on a distinct support, e.g. polycrystalline inserts
    • E21B10/5673—Button-type inserts with preformed cutting elements mounted on a distinct support, e.g. polycrystalline inserts having a non planar or non circular cutting face

Definitions

  • the disclosure relates generally to a cutting tooth and drill bit.
  • the disclosure relates specifically to a polycrystalline diamond compact cutter for use in the field of drill bits for petroleum exploration and drilling operation.
  • diamond drill bits are widely used in petroleum exploration and drilling operation.
  • This kind of bit consist of a bit body part and diamond composite sheet cutting tooth, the bit body part is made of sintered tungsten carbide material or is formed by processing a metal material as a substrate, and the diamond composite sheet cutting tooth is brazed to the front end of the cutting face of the blade of the bit.
  • diamond composite sheet cuts rock and withstands great impact from the rock at the same time. They are prone to impact damage when drilling into a high gravel content formation or a hard formation, resulting in damage to the cutting faces.
  • the debris produced by cutting through diamond composite sheet can easily form a long strip shape debris.
  • An embodiment of the disclosure is a cutting tooth comprising a cylindrical body, wherein the surface of the end portion of the cylindrical body is provided with three cutting ridges, wherein the inner end of each of the cutting ridges extends to a triangle at the vertex of a Reuleaux triangle at the end portion of the cylindrical body, wherein the outer end of each of the cutting ridges extend to the outer edge of the surface of the end portion of the cylindrical body, wherein the surfaces of the end portion of the cylindrical body on each side of each of the cutting ridges are cutting bevels; and three cutting points, each located at the triangle at the vertex of a Reuleaux triangle at the end portion of the cylindrical body.
  • the cylindrical body comprises a base formed of tungsten carbide material and a polycrystalline diamond layer connected to the top of the base, the cutting ridges are located on the upper surface of the polycrystalline diamond layer.
  • the angle between the cutting ridges is 80°-l40°.
  • the length of each of the cutting ridges is the same.
  • the cutting tooth further comprises a chamfered surface at the outer end of each of the cutting ridges.
  • the bevel size of the chamfered surface is between 0.014 and 0.022 inches.
  • the radius from the center of the cutting tooth to where the triangle meets the Reuleaux triangle is 0.173 inches.
  • the radius from the center of the cutting tooth to where the outermost vertex of the triangle is from about 0.150 to 0.450 inches.
  • the height of a backplane from the center of the Reuleaux triangle to the inner edge of the chamfered surface from 0.046- 0.054 inches.
  • a cone angle from the inner edge of the chamfered surface to the Reuleaux triangle center is 2.50°-l0.00°.
  • An embodiment of the disclosure is a diamond drill bit, comprising: a drill bit body equipped with an axial through water channel therein, a connection portion is formed at one end of the drill bit body, the other end of the drill bit body is provided with a plurality of water holes which can communicate with the water channel; a plurality of blades connected to the other end of the drill bit body in the circumferential direction, one side of each of the blade equipped with a plurality of cutting teeth side by side, the plurality of cutting teeth can comprise cutting teeth from the embodiments above.
  • the object of the present invention is to provide a convex ridge type non-planar cutting tooth having great impact resistance and balling resistance.
  • the convex ridge type non- planar cutting teeth are mounted on a drill bit to increase the mechanical speed and footage of the drill bit.
  • Another object of the present invention is to provide a diamond drill bit, convex ridge type non-planar cutting teeth are arranged on the diamond drill bit, which can effectively improve the impact resistance and balling resistance of the drill bit, thus to increase the mechanical speed and footage of the drill bit.
  • the present invention provides a convex ridge type non-planar cutting tooth comprising a cylindrical body, the surface of the end portion of the cylindrical body is provided with a main cutting convex ridge and two non-cutting convex ridges, the inner end of the main cutting convex ridge and the inner ends of the two non-cutting convex ridges converge at the surface of the end portion of the cylindrical body, the outer end of the main cutting convex ridge and the outer ends of the two non-cutting convex ridges extend to the outer edge of the surface of the end portion of the cylindrical body, the surfaces of the end portion of the cylindrical body on both sides of the main cutting convex ridge are cutting bevels.
  • the surface of the end portion of the cylindrical body between the two non-cutting convex ridges is a back bevel.
  • the surface of the end portion of the cylindrical body between the two non-cutting convex ridges is a back plane.
  • the cylindrical body comprises a base formed of tungsten carbide material and a polycrystalline diamond layer connected to the top of the base, the main cutting convex ridge and two non-cutting convex ridges are located on the upper surface of the polycrystalline diamond layer.
  • the cylindrical body comprises a base including but not limited to high speed steel, carbon steel, titanium, cobalt, or tungsten carbide.
  • the layer at the top of the base is comprised of a diamond layer including but not limited to metal- bonded diamond, resin-bonded diamond, plated diamond, ceramic-bonded diamond, polycrystalline diamond, polycrystalline diamond composite, or high temperature brazed diamond tools.
  • the angle between the two cutting bevels is 150° to 175°. [0017] In an embodiment, the angle between the two cutting bevels is 90° to 175°.
  • the length of the main cutting convex ridge is equal to that of the non-cutting convex ridges.
  • the length of the main cutting convex ridge is not equal to that of the non-cutting convex ridges.
  • the length of the main cutting convex ridge is larger than that of the non-cutting convex ridges.
  • the length of the main cutting convex ridge is smaller than that of the non-cutting convex ridges.
  • the length of the main cutting convex ridge is 1/2-2/3 times of the diameter of the cylindrical body.
  • the present invention also provides a diamond drill bit, comprising:
  • a drill bit body equipped with an axial through water channel therein, a connection portion is formed at one end of the drill bit body, the other end of the drill bit body is provided with a plurality of water holes which can communicate with the water channel; [0025] a plurality of blades connected to the other end of the drill bit body in the circumferential direction, one side of each of the blade equipped with a plurality of cutting teeth side by side, the plurality of cutting teeth comprise said convex ridge type non-planar cutting teeth.
  • the blade has an inner side and outer side surface, a top surface of the blade is connected between the inner side surface and outer side surface the plurality of the cutting teeth are disposed on the outer edge of the top surface of the blade and near the inner side surface;
  • the top surface of the blade comprises a heart portion, a nose portion, a shoulder portion and a gauge protection portion connected in turn which are extended from the center shaft diameter of the drill bit body to outside, the heart portion is close to the central axis of the drill bit body, the gauge protection portion is located on the side wall of the drill bit body and the cutting teeth are distributed across the heart portion, the nose portion, the shoulder portion and the gauge protection portion of the blade.
  • a plurality of blades are further provided with a plurality of secondary cutting teeth.
  • the secondary cutting teeth are arranged in the back row of the cutting teeth along the rotary cutting direction of the drill bit body, the plurality of secondary cutting teeth include the convex ridge type non-planar cutting tooth.
  • the convex ridge type non-planar cutting teeth are arranged on the heart portion of the blade.
  • the convex ridge type non-planar cutting teeth are arranged on the shoulder portion of the blade.
  • the convex ridge type non-planar cutting teeth are arranged on the nose portion of the blade.
  • the convex ridge type non-planar cutting teeth are arranged on the gauge protection portion of the blade.
  • the convex ridge type non-planar cutting teeth are arranged on more than one portion of the blade.
  • the convex ridge type non-planar cutting teeth are arranged on the heart, shoulder, nose, and gauge portions of the blade.
  • the convex ridge type non-planar cutting teeth and the cutting teeth are arranged in a staggered arrangement along the axial direction of the drill bit body.
  • the convex ridge type non-planar cutting teeth and the cutting teeth are arranged in an aligned arrangement along the axial direction of the drill bit body.
  • the convex ridge type non-planar cutting tooth of the present invention changes the traditional plane cylindrical cutting tooth design into a convex ridge type non-planar cutting tooth, which can greatly improve the ability of positive direction impact resistance of the cutting tooth;
  • the main cutting convex ridge which is located at the outer end of the edge of the upper surface of the polycrystalline diamond layer acts as a cutting point.
  • the debris can be automatically formed into two branches from the cutting point, and can be squeezed out from the cutting bevels on both sides of the main cutting convex ridge, such that the debris is prevented from sliding to the body part of the blade along the upper surface of the polycrystalline diamond layer and forming balling, thus greatly improving the ability of balling resistance of the cutting tooth.
  • the diamond drill bit of the present invention arranges the convex ridge type non-planar cutting teeth in the heart portion, such that the size of the debris produced by the cutting teeth in the heart portion can be reduced, and the debris can be easier to be carried out of bottom of a well by drilling fluid, thus to reduce the risk of bit balling.
  • the convex ridge type non-planar cutting teeth are arranged on the shoulder portion, therefore to improve the ability of impact resistance of the drill bit.
  • the convex ridge type non-planar cutting teeth are arranged on the shoulder portion and the outer side of the nose portion, thus to improve the ability of impact resistance of the cutting teeth in these areas, and to improve the life of drill bit.
  • the convex ridge type non-planar cutting teeth may also be arranged in the position of the secondary cutting teeth of the blade of the diamond drill bit to accommodate the needs of drilling into different formations.
  • Fig. 1 is a perspective view of a convex ridge type non-planar cutting tooth in accordance with one embodiment disclosed herein;
  • Fig. 2 is a front view of a convex ridge type non-planar cutting tooth in accordance with one embodiment disclosed herein;
  • FIG. 3 is a schematic drawing of a convex ridge type non-planar cutting tooth in accordance with one embodiment disclosed herein;
  • FIG. 4 is a schematic drawing of a convex ridge type non-planar cutting tooth in accordance with another embodiment disclosed herein;
  • Fig. 5 is a section view of a diamond drill bit having convex ridge type non-planar cutting teeth in accordance with one embodiment disclosed herein;
  • Fig. 6 is a perspective view of the arrangement of teeth of a diamond drill bit having convex ridge type non-planar cutting teeth in accordance with one embodiment disclosed herein;
  • Fig. 7 is a perspective view of the arrangement of teeth of a diamond drill bit having convex ridge type non-planar cutting teeth in accordance with another embodiment disclosed herein.
  • Fig. 8 depicts cuttings formed along the cleavage plane of hard and brittle rock.
  • Fig. 9 depicts cuttings formed when drilling into sandstone and mudstone.
  • Fig. 10 depicts a perspective view of the arrangement of teeth of a diamond drill bit having a plurality of secondary cutting teeth in accordance with one embodiment disclosed herein.
  • Fig. 11 depicts a side view of a convex ridge type non-planar cutting tooth in accordance with one embodiment discloses herein.
  • Fig. 12 A depicts a top-view of a PDC cutter.
  • Fig. 12B depicts a cross-sectional view of the PDC cutter shown in Fig. 12A along line A-A.
  • Fig. 12C depicts a cross-sectional view of the PDC cutter shown in Fig. 12A along line D-D.
  • Fig. 13 depicts a perspective view from above the PDC cutter shown in Fig. 12 A.
  • Fig. 14 depicts a perspective view from below the PDC cutter shown in Fig. 12 A.
  • Fig. 15 depicts a side-view of the PDC cutter shown in Fig. 12A.
  • Fig. 16 depicts the cutting tooth in relation to the formation.
  • a convex ridge type nonplanar cutting tooth which comprise a cylindrical body 1, the surface of the end portion of the cylindrical body 1 is provided with a main cutting convex ridge 11 and two non-cutting convex ridges 12, the inner end of the main cutting convex ridge 11 and the inner ends of the two noncutting convex ridges 12 converge at the surface of the end portion of the cylindrical body 1, the outer end of the main cutting convex ridge 11 and the outer ends of the two non-cutting convex ridges 12 extend to the outer edge 13 of the surface of the end portion of the cylindrical body 1, the surfaces of the end portion of the cylindrical body 1 on both sides of the main cutting convex ridge 11 are cutting bevels 14. Chamfered surfaces 18 are present.
  • the cylindrical body 1 comprises a base 15 formed of tungsten carbide material and a polycrystalline diamond layer 16 connected to the top of the base, the main cutting convex ridge 11 and two non-cutting convex ridges 12 are located on the upper surface of the polycrystalline diamond layer 16, and a plurality of welding positioning holes 151 are arranged on the lower surface of the base 15.
  • Material properties of polycrystalline diamond are determined mainly by the selected particles scale during sintering, polycrystalline diamond having an average particle dimension between 1 pm to 50 pm after sintering.
  • the average particle dimension of the sintered polycrystalline diamond layer 16 is from 1 pm to 25 pm according to the present invention.
  • the inner end of the main cutting convex ridge 11 and the inner ends of the two non-cutting convex ridges 12 converge at the middle of the upper surface of the polycrystalline diamond layer 16
  • the outer end of the main cutting convex ridge 11 and the outer ends of the two non-cutting convex ridges 12 extend to the outer edge 13 of the upper surface of the polycrystalline diamond layer 16.
  • Chamfered surfaces 18 are present.
  • the main cutting convex ridge 11 and the two non-cutting convex ridges 12 form a substantially "Y" type pattern, and the main cutting convex ridge 11 and the two noncutting convex ridges 12 divide the upper surface of the polycrystalline diamond layer 16 into three surfaces.
  • the upper surface of the polycrystalline diamond layer 16 located on both sides of the main cutting ridge 11 are cutting bevels 14, the cutting bevels 14 extend along an axial direction from the center of the cylindrical body 1 outwardly and downwardly.
  • the upper surface of the polycrystalline diamond layer 16 between the two non-cutting convex ridges 12 i.e., the surface of the end portion of the cylindrical body 1 is a back surface 17. That is, the cutting bevels 14 are divided by the back surface 17 on the side away from the outer end of the main cutting convex ridge 11, and the cutting bevels 14 do not meet at the far end.
  • the two cutting bevels 14 separate the strip shape debris cut by conventional planar diamond composite sheet into two smaller size debris. Chamfered surfaces 18 are present.
  • the portions of the two cutting bevels 14 which are away from the cutting point 131 are divided by the backplane 17, and do not directly converge at the surface of the blade of the drill bit, so the debris will not be attached directly to the blade of the drill bit in more cases, but will be dispersed along the two cutting bevels 14 in drilling fluid and be carried out of the bottom of a well, which will greatly reduce the balling produced by debris attached to the blade of the drill bit and wrapping the cutting work face, thereby improving the life of the drill bit, increasing mechanical speed and drill footage.
  • Polycrystalline diamond layer 16 of the present invention is designed to adopt a non- planar convex ridge, which has higher impact resistance than conventional planar diamond composite sheet.
  • performance figures of impact resistance of both can be obtained and compared.
  • the composite layer of a test sample is fixed on the flywheel of the impact fatigue testing machine through a special clamp, a motor drives the flywheel to rotate. In every revolution to the position of nine o'clock, the test sample impacts a striking block fixed to the left side and supported by a spring, rotating the flywheel for repeated impact until the test sample is destroyed. The impact fatigue property of the sample was evaluated by the number of recorded impacts before the failure.
  • the back surface 17 is a back bevel, that is, the back bevel is inclined outwardly and downwardly from the horizontal plane along the axial direction.
  • the main cutting convex ridge 11 and the two non-cutting convex ridges 12 divide the upper surface of the polycrystalline diamond layer 16 into three slopes, i.e., two cutting bevels 14 and a back bevel.
  • the main cutting convex ridge 11 and the two non-cutting convex ridges 12 may be used as tool ridges when cutting rocks.
  • the non-cutting convex ridge 12 is transformed into the main cutting convex ridge 11, after being used, the cutting tooth can be rotated a certain angle to another convex ridge by brazing and be reused as new ridge tool.
  • the main cutting convex ridge 11 is used as a tool ridge to cut rock, after being used, rotating the convex ridge type non-planar cutting tooth to a position that a non-cutting convex ridge 12 acts as a new tool ridge, such that the convex ridge type non-planar cutting tooth can be used repeatedly.
  • the convex ridge type non-planar cutting tooth of this embodiment is used in repairable drill bit.
  • the back surface 17 is a back plane, i.e., the back plane is parallel to the horizontal plane, and the two cutting bevels are inclined outwardly and downwardly from the horizontal plane alone axial direction. That is, in this embodiment, the main cutting convex ridge 11 and the two non-cutting convex ridges 12 divide the upper surface of the polycrystalline diamond layer 16 into two slopes and one plane, and the main cutting convex ridge 11 is used as tool ridge to cut rocks.
  • the convex ridge type non-planar cutting tooth of this embodiment is used in irreparable drill bit.
  • the number of slopes of the upper surface the polycrystalline diamond layer 16 of the present invention is designed to two or three, in order to optimize the manufacturing cost.
  • the angle Q between the two cutting bevels 14 is 150° to 175°.
  • the angle Q is determined by needs of actual formation. From the laboratory test of the wear ratio of the convex ridge type non planar cutting tooth, it is found that the smaller the angle, the tooth wear ratio is lower. Therefore, when drilling into high abrasive formation, the value of the angle Q should be larger. In one embodiment of the present invention, in a high impact but medium abrasive formation, the value of the angle Q is 160°. In a high abrasive formation such as sandstone formation, the value of the angle Q can be 170° to 175°.
  • the angle Q of the present invention can be designed to different value according to performance requirements, thus to optimize the operation results.
  • the main cutting ridge 11 has a length of 1/2 to 2/3 times of the diameter of the cylindrical body 1, the benefits of this kind of design are to improve the ability of impact and balling resistance of the convex ridge type non-planar cutting tooth.
  • the convex ridge type non planar cutting tooth is a 120 degrees rotationally symmetric cutting tooth, i.e., the angle between the main cutting convex ridge 11 and the two non-cutting convex ridges 12 are 120 degrees respectively, the angle between the two non-cutting convex ridges 12 is also 120 degrees, and the length of the main cutting convex ridge 11 is equal to that of the non-cutting convex ridges 12.
  • the convex ridge type non planar cutting tooth is not a rotationally symmetric cutting tooth, i.e.
  • the angle between the two non-cutting convex ridges 12 is larger than the angles between the main cutting convex ridge 11 and the two non-cutting convex ridges 12.
  • the main cutting convex ridge 11 has a length larger than that of the non-cutting convex ridges 12.
  • Fig. 11 depicts a side view of a convex ridge type non-planar cutting tooth with cutting ridge 19.
  • the manufacturing process of the convex ridge type non-planar cutting tooth of the present invention is as follows:
  • conventional plane type diamond composite sheet is fabricated by high temperature and high pressure sintering and then is processed by centerless grinding, after the outer diameter achieves the design requirements, polishing the top layer of the diamond composite sheet to conventional plane type on diamond millstone, and then the required top slope is machined on the surface of the diamond composite layer by laser cutting, The process need not one-time forming of the required diamond slope during sintering.
  • EDM is a kind of method to process the size of materials which employs the corrosion phenomena produced by spark discharge. In a low voltage range, EDM performs spark discharge in liquid medium.
  • EDM is a self-excited discharge, which is characterized as follows: before discharge, there is a higher voltage between two electrodes used in spark discharge, when the two electrodes are close, the dielectric between them is broken down, spark discharge will be generated. In the process of the break down, the resistance between the two electrodes abruptly decreases, the voltage between the two electrodes is thus lowered abruptly.
  • Spark channel must be promptly extinguished after maintaining a fleeting time, in order to maintain a "cold pole" feature of the spark discharge, that is, there's not enough time to transmit the thermal energy produced by the channel energy to the depth of the electrode.
  • the channel energy can corrode the electrode partially
  • the diamond composite sheet can be used as electrodes in the EDM, and thus can be machined by EDM.
  • EDM can avoid the error caused by the inability to accurately control the diamond shrinkage during sintering process.
  • EDM technology can effectively control the machining accuracy, and reduce the damage to the diamond layer during the machining process.
  • Convex ridge type tooth formed by electric spark machining have characteristics of high processing precision, low cost, small damage to the surface of the diamond layer and so on.
  • the convex ridge type non-planar cutting teeth of the present invention change the traditional plane cylindrical cutting tooth design into convex ridge type non-planar cutting tooth, which can greatly improve the ability of positive direction impact resistance of the cutting tooth.
  • the main cutting convex ridge 11 which is located at the outer end of the edge 13 of the upper surface of the polycrystalline diamond layer 16 acts as a cutting point 131.
  • Chamfered surfaces 18 are present.
  • the debris can be automatically formed into two branches from the cutting point 131, and can be squeezed out from the cutting bevels 14 on both sides of the main cutting convex ridge 11, such that the debris is prevented from sliding to the body part of the blade along the upper surface of the polycrystalline diamond layer 16 and forming balling, thus greatly improving the ability of balling resistance of the drill bit.
  • the present invention also provides a diamond drill bit, which comprises a drill bit body 3 and a plurality of blades 4, wherein: the drill bit body 3 is equipped with an axial through water channel 31 therein, a connection portion 32 is formed at one end of the drill bit body 3, the other end of the drill bit body 3 is provided with a plurality of water holes 33 which can communicate with the water channel 31; a plurality of blades 4 connected to the other end of the drill bit body 3 in the circumferential direction, one side of each of the blade 4 equipped with a plurality of cutting teeth 5 side by side, the plurality of cutting teeth 5 comprise convex ridge type non-planar cutting teeth 10 as described in Example 1.
  • the drill bit body 3 is substantially cylindrical, the connection portion 32 has a threaded section and is used to connect to a drill string. The power is transmitted to the diamond drill bit by the drill string.
  • the blade 4 has an inner side surface 41 and an outer side surface 42, a top surface 43 of the blade is connected between the inner side surface 41 and outer side surface 42.
  • the plurality of the cutting teeth 5 are disposed on the outer edge of the top surface 43 of the blade and near the inner side surface 42; furthermore, the top surface 43 of the blade comprises a heart portion 431, a nose portion 432, a shoulder portion 433 and a gauge protection portion 434 connected in turn which are extended from the center shaft diameter of the drill bit body 3 to outside, the heart portion 431 is close to the central axis of the drill bit body 3, the gauge protection portion 434 is located on the side wall of the drill bit body 3 and the cutting teeth 5 are distributed across the heart portion 431, the nose portion 432, the shoulder portion 433 and the gauge protection portion 434 of the blade 4.
  • the convex ridge type non-planar cutting teeth 10 and the cutting teeth 5 are arranged in a staggered arrangement along the axial direction of the drill bit body 3, that is, among the plurality of the cutting teeth 10 disposed on the outer edge of the top surface 43 of the blade and near the inner side surface 42, a conventional traditional plane cutting teeth 5 is arranged between the two convex ridge type non-planar cutting teeth 10.
  • the convex ridge type non-planar cutting teeth are arranged on the heart portion 431 of the blade 4.
  • Convex ridge cutting teeth can be arrange at the position of the heart portion 431 such that the size of the debris produced by teeth located at the heart portion 431 can be reduced, and the debris is easier to be carried out by the drilling fluid, in order to reduce the risk of forming bit balling.
  • the convex ridge type non-planar cutting teeth are arranged on the shoulder portion 433 of the blade 4.
  • the teeth located at the shoulder portion have a higher line speed and cutting power, they are more likely to withstand positive impact when the drill bit vibrates at the bottom of the well, causing the damage to diamond composite sheet, reducing the mechanical speed and footage.
  • the convex ridge type non-planar cutting teeth are arranged on the shoulder portion 433 to improve the ability of impact resistance of the drill bit.
  • the cutting teeth on the diamond drill bit can also all be convex ridge type non-planar cutting teeth.
  • This kind of drill bit can be used in the formation of readily severe balling.
  • the convex ridge type non-planar cutting teeth at the heart portion can improve the property of anti-bit balling.
  • the cost of the drill bit employing all convex ridge type non-planar cutting teeth is higher than the diamond drill bit in Fig.7.
  • the tooth at the shoulder portion usually bears the maximum cutting power during drilling.
  • the teeth located at the shoulder portion have a higher line speed, they are easy to bear the impact force from the circumferential direction which leads to the collapse of the teeth.
  • the convex ridge type non-planar cutting teeth are arranged on the shoulder portion and the outer side of the nose portion, thus to improve the ability of impact resistance of the cutting teeth in these areas, and to improve the life of the drill bit.
  • a plurality of blades 4 are further provided with a plurality of secondary cutting teeth 45.
  • the secondary cutting teeth 45 are arranged in the back row of the cutting teeth 5 along the rotary cutting direction of the drill bit body, the plurality of secondary cutting teeth 45 include convex ridge type non-planar cutting teeth 10.
  • the convex ridge type non-planar cutting teeth 10 can also depose on the top surface 43 of the shoulder portion 433 of the blade, i.e., at the position of the secondary cutting teeth 45.
  • the convex ridge type non-planar cutting teeth When the convex ridge type non-planar cutting teeth depose on the top surface 43 (i.e., at the position of the secondary cutting teeth 45) of the shoulder portion 433 of the blade, they are "embedded" within the blades 4 by brazing. [0092]
  • the convex ridge type non-planar cutting teeth are arranged in the heart portion 431, nose portion 432 and shoulder portion 433 of the blade 4 of the drill bit, to accommodate the needs of different formation drilling.
  • the convex ridge cutter When drilling into sandstone and mudstone, the convex ridge cutter creates a deformation of the rock.
  • Figure 9. The angle between two side planes of the cutting ridge is designed to be within a range such that the ductile mudstone cuttings will form a unique cuttings shape and be evacuated as a whole.
  • this convex ridge cutter bit always creates this V shaped cutting and the width of this V shape grows wider when the bit is getting to its end of life.
  • a cutting tooth which comprises a cylindrical body 1201, the surface of the end portion of the cylindrical body 1201 is provided with three cutting ridges 1212, the cutting ridges 1212 extend to triangles 1220 at the vertices of a Reuleaux triangle at the end portion of the cylindrical body 1201.
  • the outer end of the cutting ridges 1212 extend to the outer edge 1213 of the surface of the end portion of the cylindrical body 1201.
  • the surfaces of the end portion of the cylindrical body 1201 on both sides of the cutting ridges 1212 are cutting bevels 1214. Chamfered surfaces 1218 are present.
  • the cylindrical body 1201 comprises a base 1215 formed of tungsten carbide material and a polycrystalline diamond layer 1216 connected to the top of the base.
  • the cutting ridges 1212 are located on the upper surface of the polycrystalline diamond layer 1216.
  • Material properties of polycrystalline diamond are determined mainly by the selected particles scale during sintering, polycrystalline diamond having an average particle dimension between 1 pm to 50 pm after sintering. The smaller the particle size, the wear resistance of the sintered polycrystalline diamond is higher, but the corresponding impact resistance is lower. In an embodiment, the average particle dimension of the sintered polycrystalline diamond layer 1216 is from 1 pm to 25 pm.
  • the inner ends of the cutting ridges 1212 extend to triangles 1220 at the vertices of a Reuleaux triangle at the middle of the upper surface of the polycrystalline diamond layer 1216.
  • the outer end of the cutting ridges 1212 extend to the outer edge 1213 of the upper surface of the polycrystalline diamond layer 1216.
  • Chamfered surfaces 1218 are present. Viewed from the top of the polycrystalline diamond layer 1216, the cutting ridges 1212 form a Reuleaux triangle with triangles at its vertices.
  • the upper surface of the polycrystalline diamond layer 1216 located on both sides of the cutting ridges 1212 are cutting bevels 1214, the cutting bevels 1214 extend along an axial direction from the triangles 1220 at the vertices of the Reuleaux triangle on the upper surface of the polycrystalline diamond layer 1216 outwardly and downwardly.
  • the triangle can be any circular triangle.
  • the upper surface of the polycrystalline diamond layer 1216 between the cutting ridges 1212 i.e., the surface of the end portion of the cylindrical body 1201) is cutting bevel 1214.
  • the angle //between the two cutting bevels 1214 is 140° to 180°.
  • the angle Q is determined by needs of actual formation.
  • the angle Q can be designed to different value according to performance requirements, thus to optimize the operation results.
  • the cutting ridge 1212 has a length of 1/4 to 1/10 times the diameter of the cylindrical body 1201.
  • the cutting tooth is a 120 degrees rotationally symmetric cutting tooth, i.e., the angle between the cutting ridges 1212 is 120 degrees.
  • the radius from the location where the triangle 1220 meets the Reuleaux triangle is 0.173 inches. In an embodiment, the radius from the location of the outermost vertex of the triangle 1220 is 0.200 inches.
  • Fig. 12A In an embodiment, the height of the backplane is 0.046 to 0.054 inches from the center of the Reuleaux triangle to the inner edge of the chamfered surface 1218. In an embodiment, the height of the backplane is 0.050 inches from the center of the Reuleaux triangle to the inner edge of the chamfered surface 1218.
  • the bevel size of chamfered surface 1218 ranges from 0.014 to 0.022 inches.
  • the bevel size of chamfered surface 1218 is 0.018 inches.
  • the cutting ridge 1212 is 0.120 inches from the bottom of the polycrystalline diamond layer 1216.
  • cylindrical body 1201 has a lower chamfered surface 1222 at the end opposite the polycrystalline diamond layer 1216.
  • the lower chamfered surface 1222 is between 0.030-0.45 inches tall and has an angle of 40°-50°.
  • the angle of the lower chamfered surface 1222 is 45°.
  • the cone angle is 2.5°.
  • Fig. 12C. The cone angle is the angle between the center of the Reuleaux triangle and the inner edge of the chamfered surface 1218. Fig. 12C.
  • Fig. 13 depicts a perspective view from above the PDC cutter shown in Fig. 12A.
  • Fig. 14 depicts a perspective view from below the PDC cutter shown in Fig. 12A.
  • Fig. 15 depicts a side-view of the PDC cutter shown in Fig. 12A.
  • the cutting tooth can be 0.625 inches in diameter.
  • the cutting tooth can be 0.528 to 0.536 inches tall.
  • the cutting tooth is 0.532 inches tall.
  • Fig. 16 depicts the cutting tooth in relation to the formation.

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  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Mining & Mineral Resources (AREA)
  • Geology (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Environmental & Geological Engineering (AREA)
  • Fluid Mechanics (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Processing Of Stones Or Stones Resemblance Materials (AREA)
  • Earth Drilling (AREA)

Abstract

La présente invention concerne une dent de coupe non plane et un trépan au diamant. La dent de coupe non plane et le trépan au diamant ont une grande capacité de résistance aux chocs et de résistance au bourrage. Selon les caractéristiques de la formation forée, des dents de coupe sont disposées sur le trépan avec un mode différent, ce qui peut améliorer la vitesse mécanique et l'avancement du forage en pieds du trépan.
PCT/US2019/021028 2018-10-09 2019-03-06 Dent de coupe non plane de type à arête convexe et trépan au diamant WO2020076358A1 (fr)

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BR112021006683-7A BR112021006683A2 (pt) 2018-10-09 2019-03-06 dente de corte não plano do tipo cume convexo e broca de diamante

Applications Claiming Priority (2)

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US16/155,359 2018-10-09
US16/155,359 US10563464B2 (en) 2015-08-27 2018-10-09 Convex ridge type non-planar cutting tooth and diamond drill bit

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WO2020076358A1 true WO2020076358A1 (fr) 2020-04-16

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN116816271A (zh) * 2023-08-28 2023-09-29 西南石油大学 多峰齿钻头
USD1026979S1 (en) 2020-12-03 2024-05-14 Us Synthetic Corporation Cutting tool
USD1026982S1 (en) 2019-01-11 2024-05-14 Us Synthetic Corporation Cutting tool

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20160032657A1 (en) * 2004-04-30 2016-02-04 Smith International, Inc. Modified cutters and a method of drilling with modified cutters
US20170030144A1 (en) * 2014-04-16 2017-02-02 National Oilwell DHT, L.P. Downhole Drill Bit Cutting Element with Chamfered Ridge
US20170058615A1 (en) * 2015-08-27 2017-03-02 Cnpc Usa Corporation Convex ridge type non-planar cutting tooth and diamond drill bit
WO2017053475A1 (fr) * 2015-09-21 2017-03-30 National Oilwell DHT, L.P. Trépan fond de trou doté d'éléments de coupe équilibrés et procédé de fabrication et d'utilisation correspondant
WO2017172431A2 (fr) * 2016-03-31 2017-10-05 Smith International, Inc. Élément coupant à arêtes multiples
WO2018231343A1 (fr) * 2017-06-13 2018-12-20 Varel International Ind., L.L.C. Dispositifs de coupe superabrasifs pour trépans de forage ayant de multiples surfaces de coupe surélevées

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20160032657A1 (en) * 2004-04-30 2016-02-04 Smith International, Inc. Modified cutters and a method of drilling with modified cutters
US20170030144A1 (en) * 2014-04-16 2017-02-02 National Oilwell DHT, L.P. Downhole Drill Bit Cutting Element with Chamfered Ridge
US20170058615A1 (en) * 2015-08-27 2017-03-02 Cnpc Usa Corporation Convex ridge type non-planar cutting tooth and diamond drill bit
WO2017053475A1 (fr) * 2015-09-21 2017-03-30 National Oilwell DHT, L.P. Trépan fond de trou doté d'éléments de coupe équilibrés et procédé de fabrication et d'utilisation correspondant
WO2017172431A2 (fr) * 2016-03-31 2017-10-05 Smith International, Inc. Élément coupant à arêtes multiples
WO2018231343A1 (fr) * 2017-06-13 2018-12-20 Varel International Ind., L.L.C. Dispositifs de coupe superabrasifs pour trépans de forage ayant de multiples surfaces de coupe surélevées

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
USD1026982S1 (en) 2019-01-11 2024-05-14 Us Synthetic Corporation Cutting tool
USD1026979S1 (en) 2020-12-03 2024-05-14 Us Synthetic Corporation Cutting tool
CN116816271A (zh) * 2023-08-28 2023-09-29 西南石油大学 多峰齿钻头
CN116816271B (zh) * 2023-08-28 2023-11-21 西南石油大学 多峰齿钻头

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