CN106761424B - A kind of PDC drill bit that cutting element is arranged in pairs - Google Patents
A kind of PDC drill bit that cutting element is arranged in pairs Download PDFInfo
- Publication number
- CN106761424B CN106761424B CN201710043448.5A CN201710043448A CN106761424B CN 106761424 B CN106761424 B CN 106761424B CN 201710043448 A CN201710043448 A CN 201710043448A CN 106761424 B CN106761424 B CN 106761424B
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- China
- Prior art keywords
- cutting element
- drill bit
- pairs
- cutting
- pdc drill
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Classifications
-
- 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
-
- 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
Abstract
A kind of PDC drill bit that cutting element is arranged in pairs, including bit body, fixing wing, cutting element, water hole or nozzle etc. are provided in fixing wing, it is characterized by: at least 2 cutting elements have drift angle, and it is arranged in pairs on drill bit in 2 cutting elements.Such structure can improve the ability and efficiency of breaking rock on drill bit wedging stratum, improve the cutter set density of drill bit, extend the service life of drill bit, while reduce the torque of drill bit, and enhancing drill bit creeps into stability, especially suitable in directed drilling.
Description
Technical field
The invention belongs to oil-gas drilling engineering, mine engineering, building foundation engineering constructions, geological drilling, tunnel
A kind of technical equipment such as engineering, the hydrology and no-dig technique field, and in particular to PDC drill bit that cutting element is arranged in pairs.
Background technique
Diamond bit is wherein to fractured rock, the rock crushing tool of formation pit shaft in drilling engineering, according to its cutting
The difference of element mainly includes PDC drill bit and diamond-impregnated bit.
PDC drill bit by high rigidity, it is wear-resisting, from sharp composite polycrystal-diamond (abbreviation PDC tooth or cutting tooth) conduct
Cutting element is sheared and fractured rock.PDC drill bit rate of penetration in soft-medium hard formation is high, the service life is long, and drilling cost is low,
Therefore it is used widely in the drilling of oil/gas well.Although PDC tooth hardness is high, impact resistance and heat wear resistance ability
Limitation, PDC drill bit bores in hard formation, high abrasive stratum, serious heterogeneity stratum (soft or hard staggeredly interlayer, containing boulder bed etc.)
Into when, it is easy to cause the Fast Wearing of composite sheet to fail, and one of most typical failure mode is exactly composite sheet diamond layer
Impact collapse damage, the damage that collapses of composite sheet substantially reduces the stock-removing efficiency of drill bit and working life.Composite sheet collapses the main of damage
The reason is that the impact force from bottom rock, other than the impact of rock heterogeneity bring, in the more common scenario, cutting tooth
Vibration of the impact force of receiving from drill bit, especially oscillation crosswise.In general, being easiest to that the position that composite sheet collapses damage occurs on drill bit
Setting is radial zone other than cutting speed is relatively high on drill bit crown and crown.
Other than PDC drill bit, diamond-impregnated bit is also a kind of important drill bit type, and this drill bit is contained in pregnant
The basic cutting edge that a large amount of diamond molecules (i.e. diamond micro-cutting sword) in matrix-type wing body or cutting tooth are formed
Cutting element is constituted, the broken rock principle of drill bit and the Principle of Grinding and Cutting of grinding wheel are similar, that is, are exposed to the diamond particle of bit face
By grinding or micro-cutting in a manner of cut bottom rock, and along with gradually " blunt " of diamond particle, fall off and its branch
The continuous abrasion of timbering material, new diamond abrasive grain constantly go out sword and work on.
In guide digging, drill bit lateral displacement direction and drill bit cross force direction just will appear " drift " when inconsistent existing
As.There are many factor for influencing well track bearing swing, and bit factor is only in terms of one of those.Other such as formation properties,
Deformation, pit shaft quality, drilling parameter of drill string and steering tool etc., all may be steady to the orientation of guide digging to a certain extent
It is qualitative to impact.In many influence factors, the influential effect of drill bit is that comparison is significant.
Assuming that have on drill bit one by certain point on drill axis and drill bit section plane (referred to as the point axis
Line plane or axial plane).When drill bit rotates under conditions of rate of penetration is zero around own axes, the contour line of cutting element with
Section plane or axial plane are crossed to form intersection, which is the axial plane contour line of cutting element, by the axial plane of all cutting elements
Contour line pools together the shaft bottom coverage diagram to form drill bit, in the coverage diagram of shaft bottom, can be one and all cutting units
The tangent envelope curve of axial plane contour line, referred to as bit cutting contour line, bit cutting contour line reflect drill bit and drill out
Shaft bottom basic configuration feature.Normal angle refers to the directional reference line of cutting original part and the angle of center line of bit, top rake
Refer to that angle between the directional reference line of cutting element and cutting element working face, side corner refer to that cutting element work is flat
By cutting element central point and straight line perpendicular to directional reference line and pass through the angle between axial plane on face.
Summary of the invention
It is an object of the invention to: a kind of PDC drill bit that cutting element is arranged in pairs is provided, drill bit wedging stratum can be improved
Ability and efficiency of breaking rock, improve the cutter set density of drill bit, extend the service life of drill bit, while reducing the torque of drill bit, from
And enhance drill bit drilling stability, especially suitable in directed drilling.
The object of the invention is realized by following technical proposals:
The PDC drill bit of the prior art, generally including to bore includes bit body, fixing wing, is provided with and cuts in fixing wing
Cut element, the difference in water hole or nozzle etc., the PDC drill bit of this patent is: at least 2 cutting elements have drift angle, and 2
Cutting element is arranged in pairs on drill bit.
(see Fig. 3) in the vertical view of drill bit, the central point O2 of cutting element is connected with center line of bit point O1, is formed
Straight line AB is planar done by anchor point O2 and perpendicular to the straight line CD of straight line AB, by cutting element around straight line CD, rotation one
Determine angle, θ, the axis angle of straight line CD and cutting element is the drift angle of cutting element, it is specified that being positive in the counterclockwise direction, instead
Be negative.
In this patent, at least two cutting element has drift angle, and 2 cutting elements are arranged in pairs on drill bit, cutting element
Normal angle, top rake, side corner will affect the drift angle of cutting element to a certain degree, but be not equal to the inclined of cutting element
Angle.Since 2 cutting elements have drift angle, such cutting element is projected as class ellipse on the radial coverage diagram of drill bit, sees
Shown in Fig. 4, wherein L1 is to have drift angle cutting element in radial coverage diagram radial distance, and L2 is the cutting element of not drift angle in diameter
To coverage diagram radial distance, there is the cutting element of drift angle radially covering upper regional scope reduction, can be set so more
Cutting element, improves the cutter set density of drill bit, to improve the service life of drill bit, and has the cutting face curvature of drift angle cutting element
Reduce, the ability on cutting element wedging stratum can be enhanced in this way, improve the efficiency of breaking rock of drill bit.
Alternatively, 5 ° of the bias angle theta value range of pairs of cutting element≤| θ |≤85 °.
In above scheme, the location radii of pairs of cutting element, top rake, side corner, circumferential position angle are different, lead in this way
Cutting situation, the stress condition of cutting element is caused to be different from, the angle range for limiting cutting element can significantly change entire brill
The stress condition of head, while the drift angle of cutting element can also be changed for different formation condition and drilling mode, to open up
The scope of application of wide drill bit.
Alternatively, pairs of cutting element is arranged in same fixing wing, and the drift angle of pairs of cutting element is on the contrary, i.e.
For one just, it is one negative.
In above scheme, pairs of cutting element is arranged in same fixing wing, and the drift angle direction of cutting element in pairs
Conversely, because the presence of drift angle, the contact plane of two cutting elements forms an angle not parallel, such cutting element
On contact plane through decomposition after, can cancel out each other a part of tangential force, the torque of drill bit be reduced, to enhance drill bit
Stability.
Alternatively, pairs of cutting element is arranged in different fixing wings.
In above scheme, pairs of cutting element is arranged in different fixing wings, and the circumferential position angle of cutting element is not
Together, the out-of-balance force that can reduce drill bit in this way enhances the stability of drill bit.By the drift angle of whole cutting elements on a wing
For same direction, the drift angle of whole cutting elements on another wing is also same direction, according to the pass at wing circumferential position angle
System is to determine whether the drift angle of cutting element on two wings is identical.
Alternatively, the bias angle theta of pairs of cutting element is unequal, i.e. 1 ≠ θ of θ 2.
In above scheme, since the location radii of cutting element, circumferential position angle be not identical, its stress condition is not led to also not
It is identical, using different drift angles, it can guarantee being more uniformly stressed for drill bit.
Alternatively, the bias angle theta of pairs of cutting element is equal, i.e. θ 1=θ 2.
In above scheme, when pairs of cutting element is on different circumferential position angles, and in pairs cutting element identical
The drift angle of radial position, cutting element is equal, can reduce the out-of-balance force and torque of drill bit to the full extent.
Beneficial effects of the present invention:
1, pairs of cutting element has drift angle, and cutting element is projected as class ellipse on the radial coverage diagram of drill bit,
The curvature in cutting element cutting face reduces, and can enhance the ability on cutting element wedging stratum in this way, improves the broken rock effect of drill bit
Rate.
2, due to the presence of drift angle, pairs of cutting element is radially covering upper regional scope reduction, can be set so more
More cutting elements, improves the cutter set density of drill bit, to extend the service life of drill bit.
3, after pairs of cutting element has drift angle, cutting face not parallel, and form an angle, cutting element is being cut
On bevel through decomposition after, can cancel out each other a part of tangential force, reduce drill bit out-of-balance force and reduce drill bit torsion
Square effectively reduces the impact failure of Cutter to improve the stability of drill bit.
Detailed description of the invention
Fig. 1 is PDC drill bit schematic diagram of the present invention
Fig. 2 is PDC drill bit top view
Fig. 3 is cutting element drift angle schematic diagram
Fig. 4 perspective view on drill bit radial direction coverage diagram for the cutting element with and without drift angle
Fig. 5 is the identical drill bit schematic diagram in pairs of cutting element drift angle direction
Fig. 6 is pairs of cutting element schematic diagram on drill bit difference wing
It is identified in figure: 1- bit body；2- fixing wing；The pairs of cutting element of 3-；The pairs of cutting element 1 of 31-；32- is pairs of
Cutting element 2；4- conventional cutting element；The water hole 5- or nozzle.
Specific embodiment
Following non-limiting examples are for illustrating the present invention.
As shown in Figure 1, 2, a kind of PDC drill bit that cutting element is arranged in pairs, including bit body 1, fixing wing 2, solid
Cutting element 4, water hole or nozzle 5 etc. are provided on the stationary knife wing, it is characterised in that: at least 2 cutting elements 31 and 32 have
Drift angle, and be arranged in pairs on 2 cutting element drill bits.
Preferably, 5 ° of the bias angle theta value range of pairs of cutting element 3≤| θ |≤85 °, as shown in Figure 1, 2, 3.
Preferably, cutting element 3 is arranged in same fixing wing 2 in pairs, and the drift angle direction of cutting element in pairs
On the contrary, as one just, it is one negative, as shown in Figure 2.
Preferably, cutting element is arranged in different fixing wings in pairs, as shown in Figure 6.Pairs of cutting element
Drift angle direction is identical, as shown in Figure 5.
Preferably, the bias angle theta of cutting element is unequal in pairs, i.e. 1 ≠ θ of θ 2, as shown in Figure 6.
Preferably, the bias angle theta of cutting element is equal in pairs, i.e. θ 1=θ 2, as shown in Figure 2.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all in essence of the invention
Made any modifications, equivalent replacements, and improvements etc., should all be included in the protection scope of the present invention within mind and principle.
Claims (6)
1. a kind of PDC drill bit that cutting element is arranged in pairs, including bit body, fixing wing, are provided in fixing wing and cut
Cut element, water hole or nozzle, it is characterised in that: at least 2 cutting elements have drift angle, and in 2 cutting elements in drill bit
On be arranged in pairs, in the top view of drill bit, the central point of cutting element is connected with bit central point, formed cutting element
Positioning linear, do a straight line by cutting element central point and perpendicular to positioning linear, the straight line be cutting element cutting
Direction straight line rotates by a certain angle by cutting element around cutting direction straight line, the axis of cutting direction straight line and cutting element
Angle is the drift angle of cutting element, it is specified that being positive in the counterclockwise direction, otherwise is negative.
2. a kind of PDC drill bit that cutting element is arranged in pairs as described in claim 1, it is characterised in that: pairs of cutting element
5 ° of bias angle theta value range≤| θ |≤85 °.
3. a kind of PDC drill bit that cutting element is arranged in pairs as claimed in claim 2, it is characterised in that: pairs of cutting element
It is arranged in same fixing wing, and the drift angle of cutting element in pairs is contrary, as one just, one negative.
4. a kind of PDC drill bit that cutting element is arranged in pairs as claimed in claim 2, it is characterised in that: pairs of cutting element
It is arranged in different fixing wings.
5. a kind of PDC drill bit that cutting element is arranged in pairs as claimed in claim 2, it is characterised in that: pairs of cutting element
Bias angle theta it is unequal, i.e. 1 ≠ θ of θ 2.
6. a kind of PDC drill bit that cutting element is arranged in pairs as claimed in claim 2, it is characterised in that: pairs of cutting element
Bias angle theta it is equal, i.e. θ 1=θ 2.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710043448.5A CN106761424B (en) | 2017-01-21 | 2017-01-21 | A kind of PDC drill bit that cutting element is arranged in pairs |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710043448.5A CN106761424B (en) | 2017-01-21 | 2017-01-21 | A kind of PDC drill bit that cutting element is arranged in pairs |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106761424A CN106761424A (en) | 2017-05-31 |
| CN106761424B true CN106761424B (en) | 2019-04-12 |
Family
ID=58945082
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710043448.5A Active CN106761424B (en) | 2017-01-21 | 2017-01-21 | A kind of PDC drill bit that cutting element is arranged in pairs |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106761424B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109306851B (en) * | 2017-07-28 | 2024-03-15 | 西南石油大学 | Rotary cutting module and diamond drill bit with same |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1075530A (en) * | 1991-12-30 | 1993-08-25 | 德莱塞工业股份有限公司 | Drill bit with improved insert cutter pattern form |
| CN101160445A (en) * | 2005-02-22 | 2008-04-09 | 贝克休斯公司 | Drilling tool equipped with improved cutting element layout to reduce cutter damage through formation changes, methods of design thereof and drilling therewith |
| CN101605962A (en) * | 2007-02-12 | 2009-12-16 | 贝克休斯公司 | Rotary drag |
| CN101680273A (en) * | 2006-12-18 | 2010-03-24 | 贝克休斯公司 | Have the super wear-resisting cutting element that strengthens durability and strengthen wear-out life, and the drilling equipment that so is equipped with |
| CN202483461U (en) * | 2012-04-01 | 2012-10-10 | 北京金宝顺福石油技术开发有限公司 | Polycrystalline diamond compact (PDC) bit with six scrapers |
| CN103827435A (en) * | 2011-02-10 | 2014-05-28 | 史密斯运输股份有限公司 | Cutting structures for fixed cutter drill bit and other downhole cutting tools |
| CN205036302U (en) * | 2015-10-08 | 2016-02-17 | 西南石油大学 | Be applicable to directional well drill bit |
| CN106320989A (en) * | 2016-11-03 | 2017-01-11 | 西南石油大学 | Diamond drill bit |
-
2017
- 2017-01-21 CN CN201710043448.5A patent/CN106761424B/en active Active
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1075530A (en) * | 1991-12-30 | 1993-08-25 | 德莱塞工业股份有限公司 | Drill bit with improved insert cutter pattern form |
| CN101160445A (en) * | 2005-02-22 | 2008-04-09 | 贝克休斯公司 | Drilling tool equipped with improved cutting element layout to reduce cutter damage through formation changes, methods of design thereof and drilling therewith |
| CN101680273A (en) * | 2006-12-18 | 2010-03-24 | 贝克休斯公司 | Have the super wear-resisting cutting element that strengthens durability and strengthen wear-out life, and the drilling equipment that so is equipped with |
| CN101605962A (en) * | 2007-02-12 | 2009-12-16 | 贝克休斯公司 | Rotary drag |
| CN103827435A (en) * | 2011-02-10 | 2014-05-28 | 史密斯运输股份有限公司 | Cutting structures for fixed cutter drill bit and other downhole cutting tools |
| CN103842607A (en) * | 2011-02-10 | 2014-06-04 | 史密斯运输股份有限公司 | Kerfing hybrid drill bit and other downhole cutting tools |
| CN202483461U (en) * | 2012-04-01 | 2012-10-10 | 北京金宝顺福石油技术开发有限公司 | Polycrystalline diamond compact (PDC) bit with six scrapers |
| CN205036302U (en) * | 2015-10-08 | 2016-02-17 | 西南石油大学 | Be applicable to directional well drill bit |
| CN106320989A (en) * | 2016-11-03 | 2017-01-11 | 西南石油大学 | Diamond drill bit |
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| Publication number | Publication date |
|---|---|
| CN106761424A (en) | 2017-05-31 |
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Legal Events
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| PB01 | Publication | ||
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| TA01 | Transfer of patent application right | ||
| TA01 | Transfer of patent application right |
Effective date of registration: 20190313 Address after: 611731 Tianchen Road 333, Chengdu High-tech Zone (West District), Sichuan Province Applicant after: SICHUAN CHUANSHI CHRIDA DIAMOND BIT CO.,LTD. Address before: 610500 a unit 2403, Jin Du street, Xindu town, Xindu District, Chengdu, Sichuan, 2403 Applicant before: Liu Wei |
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20230727 Address after: 142 Yongke Road, Jinma Street, Chengdu Strait Science and Technology Industrial Development Park, Wenjiang District, Chengdu, 610000, Sichuan Patentee after: SICHUAN CHUANSHI DIAMOND BIT Co.,Ltd. Address before: 611731 Tianchen Road 333, Chengdu High-tech Zone (West District), Sichuan Province Patentee before: SICHUAN CHUANSHI CHRIDA DIAMOND BIT CO.,LTD. |