CN211647998U - PDC drill bit capable of preventing block falling and drill clamping - Google Patents
PDC drill bit capable of preventing block falling and drill clamping Download PDFInfo
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- CN211647998U CN211647998U CN201922077089.2U CN201922077089U CN211647998U CN 211647998 U CN211647998 U CN 211647998U CN 201922077089 U CN201922077089 U CN 201922077089U CN 211647998 U CN211647998 U CN 211647998U
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Abstract
The utility model discloses a prevent falling PDC drill bit of piece card brill relates to oil drilling technical field, and it is tighter and tighter to fall the piece card and advance the drill bit wedge groove when solving current drill bit and playing to bore, and the problem that can't play the brill smoothly, including the bit body that connects with the joint and the joint, be provided with a plurality of blades on the bit body along circumference, every blade includes from last to down set up the drill bit crown, the gauge portion that equals the width with the drill bit crown and to the afterbody inclined plane of drill bit body internal diameter slope, the rake face of drill bit crown is equipped with main cutting teeth, the rake face of gauge portion is provided with the side tooth, the gauge face of gauge portion is provided with the wearing layer; the tail inclined plane is provided with auxiliary cutting teeth or hard alloy columns; the sections of the gauge surface and the tail inclined surface of the gauge are respectively rectangles or parallelograms with equal width; the utility model discloses a section on gage surface and afterbody inclined plane is rectangle or parallelogram, makes the width aequilate of chip groove each department, falls the block card and dies the problem that causes unable chip lifting at wedge chip groove when effectively avoiding the chip lifting.
Description
Technical Field
The utility model relates to an oil drilling technical field specifically relates to a PDC drill bit for soft to well hard formation well drilling.
Background
A PDC bit (Polycrystalline Diamond Compact bit) is a short-term Polycrystalline Diamond Compact bit, which breaks rock by scraping and shearing, is a drilling tool commonly used in the oil and gas drilling industry, and has been widely used in geological exploration and oil and gas drilling at present.
The existing PDC drill bit is a blade type drill bit, namely a plurality of blades are arranged on a drill bit body, PDC cutting teeth are welded on the blades, a chip discharge groove is formed between two adjacent blades, the blades generally comprise a drill bit crown part and a diameter protection part, the drill bit crown part is used for crushing and drilling substances such as rocks on the front wall of a stratum well, the diameter protection part plays a role in regulating the diameter of a shaft in the drilling process, and the stable work of the drill bit at the bottom of the well is maintained.
When the PDC drill bit is adopted for drilling in actual petroleum drilling, the drill bit is very easy to be wrapped by the collapsed soil of the well wall and forms a mud bag, so that the drill bit can not be taken out due to being clamped in the well, or the well is very easy to reduce when the well meets a gypsum rock or mudstone stratum, the problem of drill bit jamming can also occur, a plurality of procedures are needed to be carried out to take out the drill bit under the condition that the drill bit is not damaged, and the drill jamming brings a lot of troubles for drilling and influences the drilling progress and efficiency.
Based on the easy circumstances of sticking of drill bit, current PDC drill bit carries out further improvement, generally can set up the afterbody inclined plane at the lower extreme of wing gauge portion, and set up vice cutting teeth on the afterbody inclined plane, when the sticking of drill bit condition appears in the drill bit, the afterbody inclined plane of drill bit and the vice cutting teeth on it can produce the cutting power that returns to the barrier that blocks the drill bit at the jack-up in-process, dig the sticking of drill bit rock and hit the bits of broken glass, make things convenient for the drill bit to withdraw from, the sticking of drill bit phenomenon and the degree of difficulty of taking out of drill bit after the sticking of drill bit have been reduced to a certain extent.
However, such improved PDC bits still have deficiencies in use: on one hand, two sides of the tail inclined plane of the PDC drill bit gradually draw close downwards, the width of the lower part of the tail inclined plane gradually narrows until the width of the tail end is close to zero, so that a chip groove on the drill bit becomes a wedge-shaped groove with a small upper part and a large lower part, when the drill bit is stuck, a falling block can be stuck into a wide-mouth wedge-shaped chip groove and is stuck more and more tightly in the chip groove along with the drill bit sticking of the PDC drill bit, and the drill bit cannot be smoothly pulled; on the other hand, when the stratum with strong abrasiveness is directionally drilled, the gauge surface of the PDC drill bit is easy to wear, and the drill bit fails after the gauge surface is worn, so that the service life of the whole drill bit is influenced.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide a: in order to solve the problem that the current PDC drill bit falls the easy card of piece and dies to lead to the drill bit unable to take out in the chip groove at the brill pulling-up in-process, the utility model provides a PDC drill bit that the wearability is stronger, can effectively prevent to fall a card and bore.
The utility model discloses a realize above-mentioned purpose and specifically adopt following technical scheme: a PDC drill bit capable of preventing block dropping and drill clamping comprises a joint and a drill bit body connected with the joint, wherein a plurality of blades are arranged on the drill bit body along the circumferential direction, chip grooves are formed between every two adjacent blades, each blade comprises a drill bit crown and a gauge part which is as wide as the drill bit crown from top to bottom, a front cutter face of the drill bit crown is provided with a main cutting tooth, a front cutter face of the gauge part is provided with a side tooth, a gauge face of the gauge part is provided with a wear-resistant layer, a tail inclined plane which inclines towards the inner diameter of the drill bit body is arranged below the gauge part on the blade, and the tail inclined plane is provided with an auxiliary cutting tooth or a hard alloy column; the gauge surface of the gauge is rectangular or parallelogram, and the section of the tail inclined surface is rectangular or parallelogram with the same width as the gauge part.
Preferably, the tooth tip shape of the secondary cutting tooth is a cone tip shape or a ball head shape.
Preferably, the rake face of each gauge is provided with at least two side teeth from top to bottom.
Preferably, the tail inclined plane and the tangent plane of the diameter-keeping part form an included angle theta, and the value range of theta is more than 0 degree and less than theta and less than 90 degrees.
Preferably, the overall cross-sectional shape of the chip flutes is rectangular or parallelogram.
Preferably, the chamfer radius R of the intersection line of each blade and the chip groove is more than or equal to 10 mm.
Preferably, the wear-resistant layer is made of artificial polycrystalline diamond.
The utility model has the advantages as follows:
1. the anti-block-dropping and block-sticking PDC drill bit is provided with the wear-resistant layer on the gauge surface of the gauge part, so that the wear resistance of the gauge surface is effectively enhanced, and the overall service life of the drill bit is prolonged; the sections of the gauge surface and the tail inclined surface of the gauge are respectively rectangular or parallelogram with equal width, so that the width of the lower port of the chip groove is equal to that of the middle part, and the problem that the falling blocks are clamped into the wedge-shaped chip groove to be clamped in the process of drilling is avoided; the tail inclined plane is provided with auxiliary cutting teeth or hard alloy columns, so that the rock which falls off and blocks the drill can be planed and broken in the process of pulling the drill, and the problem of drill blocking is solved;
2. the tooth point shape of the auxiliary cutting tooth of the utility model is cone point shape or ball head shape, which effectively ensures the rigidity of the auxiliary cutting tooth and simultaneously enhances the cutting force;
3. the front cutter face of each gauge part of the utility model is at least provided with two side teeth from top to bottom, thereby ensuring the gauge strength of the gauge part and simultaneously enhancing the stability of the whole drill bit in the drilling process;
4. the included angle theta formed by the tail inclined plane and the tangent plane of the gauge part of the utility model is an acute angle, so that the bottom end of the tail inclined plane is ensured to form a conical end, and when the drill is started, the stress area of the stress end can be effectively reduced, thereby reducing the drill-starting resistance and facilitating the drill-starting;
5. the chamfer radius R of the intersection line of each blade and the chip groove is more than or equal to 10mm, on one hand, the chamfer is arranged at the inner corner, so that rock debris can be effectively prevented from being gradually accumulated at the top angle in the chip groove to generate mud bags, and on the other hand, compared with a right-angle structure, the chamfer is arranged at the bottom of each blade, the chamfer radius is ensured, the strength of each blade can be effectively enhanced, and the blade is prevented from being broken;
6. the utility model discloses a material of wearing layer is artificial diamond glomerocryst, and artificial diamond glomerocryst is because of being close of the thermal expansion coefficient of binder and diamond, so its heat-resisting temperature reaches about 1200 ℃, has very high impact strength and wearability, more satisfies the stratum drilling needs that geological conditions is more complicated, uses artificial diamond glomerocryst as the wearing layer of gauge portion can effectively strengthen its wearability to improve whole drill bit life.
Drawings
Fig. 1 is a schematic structural diagram of the present invention;
FIG. 2 is a top view of FIG. 1;
FIG. 3 is a schematic structural view of the present invention with auxiliary cutting teeth on the inclined surface of the tail portion;
fig. 4 is a schematic structural view of the utility model with a hard alloy column on the inclined plane of the tail part.
Reference numerals: 1-drill bit crown, 2-main cutting teeth, 3-wear-resistant layer, 4-gauge, 5-side teeth, 6-tail inclined plane, 7-auxiliary cutting teeth, 8-joint, 9-drill bit body, 10-water spray hole, 11-chip groove and 12-hard alloy column
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention, as generally described and illustrated in the figures herein, may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present invention, presented in the accompanying drawings, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures. Furthermore, the terms "first," "second," and the like are used merely to distinguish one description from another, and are not to be construed as indicating or implying relative importance.
In the description of the embodiments of the present invention, it should be noted that the terms "inside", "outside", "up", and the like indicate the directions or positional relationships based on the directions or positional relationships shown in the drawings, or the directions or positional relationships that the products of the present invention are conventionally placed when used, and are only for convenience of describing the present invention and simplifying the description, but do not indicate or imply that the device or element to which the term refers must have a specific direction, be constructed and operated in a specific direction, and thus, should not be construed as limiting the present invention.
Example 1
As shown in fig. 1 to 4, the embodiment provides a PDC drill bit capable of preventing a drill from being stuck, which includes a joint 8 and a bit body 9 connected to the joint 8, five blades are circumferentially disposed on the bit body 9, a junk slot 11 is formed between every two adjacent blades, the junk slot 11 is used for discharging rock debris, at least one water jet hole 10 is disposed in each junk slot 11, and drilling fluid is jetted from the water jet holes 10 to clean a well bottom and cool cutting teeth. Each blade comprises a drill bit crown part 1, a gauge protection part 4 and a tail inclined plane 6, wherein the drill bit crown part 1, the gauge protection part 4 and the tail inclined plane incline towards the inner diameter of a drill bit body 9 are arranged from top to bottom, a main cutting tooth 2 is arranged on a front cutter face of the drill bit crown part 1, side teeth 5 are arranged on a front cutter face of the gauge protection part 4, and a wear-resistant layer 3 is arranged on a gauge protection surface of the gauge protection part 4; the tail inclined plane 6 of the blade is provided with an auxiliary cutting tooth 7 or a hard alloy column 12; the gauge surface of gauge 4 is rectangular or parallelogram, and the section of tail inclined plane 6 is rectangular or parallelogram with the same width as gauge 4, that is, the gauge surface of gauge 4 and the section of tail inclined plane 6 can be any combination of rectangular and parallelogram with the same width, either rectangular or parallelogram, or combination of rectangular and parallelogram with the same width.
The cross sections of the gauge face of the gauge portion 4 and the tail inclined face 6 are rectangular or parallelogram, so that the width of the chip groove 11 located on the gauge portion 4 and the tail inclined face 6 is equal, a wide-mouth wedge-shaped groove cannot be formed, the problem that the chip groove 11 cannot be drilled due to the fact that a falling block is clamped into the chip groove 11 in the drilling process and is clamped in the chip groove 11 along with the reverse force of the drilling process is effectively solved, the tail inclined face 6 is provided with the auxiliary cutting teeth 7 or the hard alloy columns 12, the falling block, the rock can be planed and broken in the drilling process, and the problem of drilling clamping is solved.
Example 2
As shown in fig. 3, the present embodiment is further optimized based on embodiment 1, specifically:
the shape of the tooth tip of the auxiliary cutting tooth 7 is a cone tip shape, so that the rigidity of the auxiliary cutting tooth 7 is effectively ensured, and the cutting force is enhanced; the front tool face of each gauge part 4 is uniformly provided with two side teeth 5 from top to bottom, so that the gauge strength of the gauge part 4 is ensured, and the drilling stability of the drill bit is improved; the included angle theta formed by the tail inclined plane 6 and the tangent plane of the gauge part 4 is in the range of 0 degrees to 90 degrees, so that the bottom end of the tail inclined plane 6 forms a conical end, and when the drill is started, the stress area of the stress end can be effectively reduced, so that the drill starting resistance is reduced, and the drill is convenient to start.
Example 3
As shown in fig. 1 and fig. 3, the present embodiment is further optimized based on embodiments 1 and 2, specifically:
the overall section shape of the chip groove 11 is rectangular or parallelogram, the bit crown 1 of the blade of the PDC bit is arranged in different modes, namely inclined arrangement and vertical arrangement, the top end of the chip groove 11 of the bit crown 1 which is vertically arranged is rectangular, and the sections of the gauge surface of the gauge part 4 and the tail inclined surface 6 are both rectangular, so that the overall section shape of the chip groove 11 can be ensured to be rectangular; the top end of a chip groove 11 of the drill crown 1 which is obliquely arranged is parallelogram, and the cross sections of the gauge surface of the gauge part 4 and the tail inclined surface 6 are both parallelogram, so that the whole cross section shape of the chip groove 11 is parallelogram; as a further preferred implementation manner of embodiment 1, the overall cross-sectional shape of the junk slots 11 is set to be rectangular or parallelogram, so that two side edges of the junk slots 11 can be further ensured to be positioned on a straight line, a break point is avoided, the possibility that a falling block is clamped into the junk slots 11 is further reduced, and meanwhile, the accumulation of rock debris at the break point of the junk slots 11 is avoided.
Example 4
As shown in fig. 2, the present embodiment is further optimized based on embodiments 1, 2 and 3, and the specific differences are as follows:
the intersection of each blade and the chip groove 11 is provided with a chamfer, the radius R of the chamfer is larger than or equal to 10mm, on one hand, the chamfer is arranged at the intersection of the blade and the chip groove 11, so that rock debris can be effectively prevented from being gradually accumulated at the top angle in the chip groove 11 to cause mud pockets, on the other hand, compared with a right-angle structure, the chamfer is arranged at the bottom of the blade, the radius of the chamfer is ensured, the strength of the blade can be effectively enhanced, and the blade is prevented from being broken.
Claims (7)
1. The utility model provides an anti-drop PDC drill bit that piece card bored, includes joint (8) and bit body (9) be connected with joint (8), is provided with a plurality of blades along circumference on bit body (9), forms chip groove (11) between two liang of adjacent blades, every the blade includes from last drill bit crown (1) that sets up extremely down, with gauge portion (4) that drill bit crown (1) is aequilate, the rake face of drill bit crown (1) is equipped with main cutting tooth (2), and the rake face of gauge portion (4) is provided with side tooth (5), its characterized in that: the gauge surface of the gauge part (4) is provided with a wear-resistant layer (3); a tail inclined plane (6) which inclines towards the inner diameter of the drill bit body (9) is arranged below the diameter-retaining part (4) on the blade, and the tail inclined plane (6) is provided with auxiliary cutting teeth (7) or hard alloy columns (12); the gauge surface of the gauge (4) is rectangular or parallelogram, and the section of the tail inclined surface (6) is rectangular or parallelogram with the same width as the gauge (4).
2. The PDC drill bit of claim 1, wherein: the tooth tip of the auxiliary cutting tooth (7) is in a cone tip shape or a ball head shape.
3. The PDC drill bit of claim 1, wherein: the front cutter face of each gauge (4) is at least provided with two side teeth (5) from top to bottom.
4. The PDC drill bit of claim 1, wherein: the tail inclined plane (6) and the tangent plane of the gauge (4) form an included angle theta, and the value range of theta is more than 0 degree and less than 90 degrees.
5. The PDC drill bit of claim 1, wherein: the overall cross-sectional shape of the chip grooves (11) is rectangular or parallelogram.
6. The PDC bit against chipping and sticking according to any one of claims 1 to 5, wherein: the chamfer radius R of the intersection line of each blade and the chip groove (11) is more than or equal to 10 mm.
7. The PDC drill bit of claim 1, wherein: the wear-resistant layer (3) is made of artificial diamond polycrystal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922077089.2U CN211647998U (en) | 2019-11-27 | 2019-11-27 | PDC drill bit capable of preventing block falling and drill clamping |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922077089.2U CN211647998U (en) | 2019-11-27 | 2019-11-27 | PDC drill bit capable of preventing block falling and drill clamping |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN211647998U true CN211647998U (en) | 2020-10-09 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201922077089.2U Active CN211647998U (en) | 2019-11-27 | 2019-11-27 | PDC drill bit capable of preventing block falling and drill clamping |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN211647998U (en) |
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2019
- 2019-11-27 CN CN201922077089.2U patent/CN211647998U/en active Active
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