CN105804663A - Mono-cone bit with PDC combined tooth - Google Patents
Mono-cone bit with PDC combined tooth Download PDFInfo
- Publication number
- CN105804663A CN105804663A CN201610349072.6A CN201610349072A CN105804663A CN 105804663 A CN105804663 A CN 105804663A CN 201610349072 A CN201610349072 A CN 201610349072A CN 105804663 A CN105804663 A CN 105804663A
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- China
- Prior art keywords
- pdc
- tooth
- cone
- gear wheel
- polycrystalline diamond
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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
- E21B10/46—Drill bits characterised by wear resisting parts, e.g. diamond inserts
- E21B10/50—Drill bits characterised by wear resisting parts, e.g. diamond inserts the bit being of roller type
-
- 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
- E21B10/08—Roller bits
- E21B10/16—Roller bits characterised by tooth form or arrangement
Abstract
The invention discloses a mono-cone bit with a PDC combined tooth and belongs to the technical field of drilling devices of petroleum and natural gas, mine engineering, building foundation engineering construction, geology and hydrology and the like. The mono-cone bit comprises a bit body and a cone, wherein the cone is rotatably connected with the bit body; cutting teeth are arranged on the cone; at least one of the cutting teeth on the cone is a PDC combined tooth; the PDC combined tooth is formed by combining two PDC teeth; each PDC tooth consists of a body and a polycrystalline diamond layer covering more than 60% of the support surface of the body; the combination manner of the two PDC teeth is characterized by enabling the polycrystalline diamond layers to fit closely and clamping the polycrystalline diamond layers by two bodies on the outer side to form a four-layer sandwich structure; when the PDC combined tooth is arranged on the cone, an included angle between a normal line of the polycrystalline diamond layer fitting surface of the PDC combined tooth and a normal line of a cone contour curved surface at the arrangement point of the PDC combined tooth on the cone is 75-90 degrees. Through the PDC combined tooth, the rock breaking efficiency of the mono-cone bit can be improved, and the service life of the mono-cone bit can be prolonged.
Description
Technical field
The invention belongs to the drilling equipment technology such as petroleum gas, mine engineering, building foundation engineering construction, geology, the hydrology
Field, concretely relates to a kind of single-cone rotary drill bit.
Background technology
Drill bit is in order to fractured rock, the rock crushing tool of formation pit shaft in drilling engineering.Brill used in drilling engineering now
Head mainly has rifler and PDC (composite polycrystal-diamond) drill bit.
Gear wheel on rifler is rotationally connected with bit body formation by bearing arrangement, during bit operation, and bit body rotating band
Dynamic gear wheel is while drill axis rotates, and gear wheel also can rotate around the axis of self, and the cutting tooth on gear wheel is in above two
The synthesis of motion is lower makees complicated compound motion, and rifler belongs to on-fixed cutter drill bits.
Single-cone rotary drill bit is the one in rifler, is one of main rock crushing tool of use in drilling engineering, particularly exists
The slimhole drilling of deep & ultra-deep well plays an important role.Single-cone rotary drill bit mainly utilizes the tooth (cutting on gear wheel
Tooth) the broken rock of the effect of cutting is scraped in the extruding of rock, the cutting tooth on gear wheel is scraped with web form in shaft bottom and is cut rock.Single cone bores
A cutting tooth part (gear wheel front end) on head gear wheel contacts brokenly rock all the time with shaft bottom, and part cutting gear changes and connects with shaft bottom
Touching broken rock, this just divide into permanent contact area (gear wheel front end, such as the 21 of Fig. 5) and alternately contact area the gear wheel of single-cone rotary drill bit
(such as the 22 of Fig. 5).
In single-cone rotary drill bit drilling process gear wheel while drill axis rotates also around the axis rotation of self, cutting on gear wheel
Cut tooth and scrape butt in constantly change relative to bottom rock: the cutting tooth on gear wheel perseverance contact area during scraping and cutting rock,
The butt of scraping of its relative rock is continually changing between 0～360 °；Cutting tooth on gear wheel alternately contact area cuts rock scraping
During, the butt of scraping of its relative rock changes between 0～180 °.This makes cannot directly apply on single-cone rotary drill bit pole
It is suitable for scraping the form of cutting and breaks the diamond class cutting tooth that composite polycrystal-diamond (PDC tooth) uniform wearability of rock is extremely strong.Former
Because being that composite polycrystal-diamond (PDC tooth) is made up of body and polycrystalline diamond layer two parts, rock is risen and mainly scrapes
Cut effect is polycrystalline diamond layer, PDC tooth scrape cut as time there is directivity, can only be that polycrystalline diamond layer exists at front body
After.If PDC tooth is in the course of the work directly by opposition, it is easy to cause bursting apart of polycrystalline diamond layer, sternly
Heavily reduce the working life of PDC tooth, even make PDC tooth damage within the extremely short time and lost efficacy.
Therefore, the cutting tooth on existing single-cone rotary drill bit is generally hard-metal insert, and the wearability of hard-metal insert is far away from PDC
The diamond class cutting teeth such as tooth.The wearability deficiency of cutting tooth is the deadly defect of single-cone rotary drill bit, and cutting tooth is easy to wear seriously
Have impact on the service life of single-cone rotary drill bit.
Summary of the invention
It is an object of the invention to: propose a kind of single-cone rotary drill bit with PDC combination tooth, to improve the broken of single-cone rotary drill bit
Rock efficiency and service life.
The object of the invention is realized by following technical proposals:
A kind of have PDC combination tooth single-cone rotary drill bit, including bit body and gear wheel, gear wheel and bit body for being rotationally connected,
Be provided with cutting tooth on gear wheel, the cutting tooth on gear wheel at least one be PDC combine tooth, PDC combination tooth by two PDC
Tooth combines, and PDC tooth is made up of (preferably by this polycrystalline diamond layer of body and covering body supporting surface 60% area above
The polycrystalline diamond layer of body and the covering whole supporting surface of body is constituted), the compound mode of two PDC teeth is that polycrystalline diamond layer is tight
Closely connected conjunction, and clamped in four layers of sandwich structure by two bodies in outside, and the thickness of close cone portion is more than away from gear wheel portion
The thickness divided, the both sides body thickness farthest away from the tip portion of gear wheel is respectively less than 2 times of middle polycrystalline diamond layer thickness,
The both sides body thickness being fixed in gear wheel is all higher than 3 times of middle polycrystalline diamond layer thickness；The glomerocryst gold of PDC combination tooth
The normal of hard rock layer binding face and this PDC on gear wheel combine the angle of the cutter profile normal to a surface at tooth set-point at 75-90
°。
Composite polycrystal-diamond also known as PDC tooth (Polycrystalline Diamond Compact) or PDC composite sheet,
(with reference to Fig. 6) is formed by polycrystalline diamond layer and body two parts.PDC tooth uses diadust and hard alloy substrate to exist
Under the conditions of high pressure high temperature, sintering forms.(thickness is typically at 0.5-3mm for the polycrystalline diamond layer of diadust formation PDC tooth
Between), hard alloy substrate becomes the body of PDC tooth.PDC tooth had both had the high rigidity of diamond, high-wearing feature, had again
There are intensity and the toughness of hard alloy, are to manufacture cutting tool, drilling bit and the ideal material of other wear resistant tools.
PDC tooth be suitable for by scrape cut in the way of work, owing to the hardness of polycrystalline diamond layer and the wearability of PDC tooth are significantly larger than hard
The body of alloy material, therefore PDC tooth scrape cut as time there is self-sharpening, i.e. the rate of wear of polycrystalline diamond layer is obvious
It is slower than body, makes the cutting edge (hard and wear-resisting polycrystalline diamond layer) of PDC tooth remain sharp keen state.
PDC tooth scrapes cut when making, and plays that mainly scrape the effect of cutting is polycrystalline diamond layer.The polycrystalline diamond layer of PDC tooth is hard and crisp,
Body is the softest but has good toughness, therefore PDC tooth scrape cut as time there is directivity, can only be glomerocryst gold
Hard rock layer front body after carry out scraping and cut (with reference to Fig. 7), i.e. body be in the rear portion of polycrystalline diamond layer push away hold support poly-
Diamond layer.If the adverse movement in the course of the work of PDC tooth, body front polycrystalline diamond layer after carry out scraping cutting,
Polycrystalline diamond layer is directly by opposition, it is easy to causes bursting apart or coming off of polycrystalline diamond layer, seriously reduces PDC
The working life of tooth, even makes PDC tooth damage within the extremely short time and lost efficacy.
In this patent, the normal of the polycrystalline diamond layer binding face of PDC combination tooth, refer to be perpendicular to the glomerocryst gold of PDC combination tooth
The straight line of hard rock layer binding face.Cutter profile curved surface, refers to before arranging cutting tooth, former gear wheel solid object surface (curved surface).Tooth
Normal at wheel contour surface point, refers to be perpendicular to the straight line in this incisal plane.PDC on gear wheel combines tooth set-point,
Refer to before PDC combination tooth is set, in order to arrange location (reference) point of cutting tooth on former gear wheel surface.Axial plane refers to
Cross the plane of gear wheel axis；The axial plane crossing PDC combination tooth set-point refers to not only cross PDC combination tooth set-point but also cross roller axle
The plane of line, the plane i.e. determined by PDC combination tooth set-point and gear wheel axis.
The PDC combination tooth that the PDC tooth fitted by two polycrystalline diamond layers in this patent is formed is arranged on single-cone rotary drill bit
On gear wheel, its relatively prior art provides the benefit that:
1, the PDC tooth that the combination of the PDC on this patent single-cone rotary drill bit tooth is fitted by two polycrystalline diamond layers is constituted, PDC
The polycrystalline diamond layer of combination tooth is in the centre of the cemented carbide body of two PDC teeth, has cemented carbide body before and after formation
Centre is the combination tooth of polycrystalline diamond layer.No matter PDC combination tooth, during scraping and cutting through rock, combines tooth and cuts relative to scraping of rock
Direction how, and the polycrystalline diamond layer of each PDC tooth all will make body at front polycrystalline diamond as the most single PDC tooth
Layer after scrape and cut rock.The polycrystalline diamond layer of two PDC teeth of PDC combination tooth mutually fits tightly, as a PDC
The body of tooth is at front polycrystalline diamond layer when rear, and the polycrystalline diamond layer of another PDC tooth will be scraped at front and body rear
Always there is body to hold at pusher during cutting and support polycrystalline diamond layer.So, the tooth direction of motion relative to rock no matter is cut
How to change, there is bursting apart or coming off of polycrystalline diamond layer all without as single independent PDC tooth in PDC combination tooth.Separately
Outward, the PDC combination tooth on gear wheel is made up of two PDC tooth combinations, and its wearability is significantly larger than on conventional roller cone drill bit employing
Hard-metal insert.Therefore, PDC combination tooth is applied and will can be significantly improved the wear-resisting of drill teeth on the gear wheel of single-cone rotary drill bit
Property, and then improve the service life of drill bit.
2, the PDC combination tooth of this patent uses four layers of sandwich structure (body-polycrystalline diamond that two PDC teeth combine
Layer-polycrystalline diamond layer-body), can directly use existing PDC tooth directly to combine, the simplest efficient.According to this
Patent foregoing teachings, skilled person will appreciate that, as a kind of replacement being readily apparent that of this patent structure: three-layer sandwich
Structure (body-polycrystalline diamond layer-body), this structure it is contemplated that two kinds of implementations, one be directly overall become
Type, this scheme in theory it is achieved that but owing to the actual course of processing is the most difficult, it is virtually impossible to realize, it is impossible to possess
The notable convenient efficient advantage that this patent is industrially applied；Another kind is the combination of existing PDC tooth and independent body, equally
Ground, needs additional designs to process a single body, it is impossible to possess that this patent industrially applies is notable convenient the most excellent
Gesture.This is because, the polycrystalline diamond layer of PDC tooth is directly fitted with single body, when PDC tooth is reversely scraped and cut, individually
Body is the mechanical thrust that the polycrystalline diamond layer of PDC tooth provides contact, independent body and the non-shape of polycrystalline diamond layer
Becoming and closely merge, the polycrystalline diamond layer of PDC tooth is scraped by opposition when cutting damage, the abrasion of polycrystalline diamond layer come off with
Single PDC tooth is reversely scraped abrasion when cutting and is come off similar.Individually body can only give polycrystalline diamond layer mechanical thrust, and not
It is provided that holding effect.And this patent is combined by two PDC teeth, no matter cut the motion of tooth thataway, combine tooth
Always having a PDC tooth is that polycrystalline diamond layer is cut posterior forward the scraping of front body, and the body of this tooth provides for two PDC teeth
While pushing away holding force, moreover it is possible to the polycrystalline diamond layer for self provides retentivity, because body and polycrystalline diamond layer are to pass through
Combine after chemistry, physics reaction, its mutual synthesis and ubiquit, having between body and polycrystalline diamond layer
Learn the active force of key.This retentivity of polycrystalline diamond layer is made PDC odontotripsis slow by body, a PDC of combination tooth
Tooth slowly abrasion can slow down the abrasion of another tooth, thus improves performance and the life-span of whole combination tooth.Additionally, as a kind of
Deformation, once had and arranged a small amount of polycrystalline diamond on the body face of cylinder of single PDC tooth, and polycrystalline diamond is absorbed in the deep of body
Degree is within 2mm, and less than 1/5th of body diameter, the polycrystalline diamond that the body face of cylinder is arranged is on body end face
The distance (axial along PDC tooth cylinder) of polycrystalline diamond layer more than 2mm, but this scheme is quickly eliminated.Reason is:
On the face of cylinder of this PDC tooth, a small amount of polycrystalline diamond is set, in order that slowing down PDC tooth in the stratum that abrasiveness is strong
The rate of wear, but owing to the polycrystalline diamond on the face of cylinder and polycrystalline diamond layer on body end face must be provided with a segment distance (greatly
In 2mm, provide effective body for the polycrystalline diamond layer on end face, it is to avoid polycrystalline diamond layer support without enough bodies and
Keep intensity), bigger distance makes the pressure-bearing surface of PDC tooth substantially increase, and the premise that PDC tooth energy high-efficient scraping cuts through rock is PDC
Tooth can first wedging (intrusion) rock, the program make PDC tooth cannot effective wedging stratum, while also counteract oneself of PDC tooth
Sharp function, reduces the efficiency of breaking rock of PDC tooth, and therefore using effect is the best, is quickly eliminated.The PDC combination of this patent
The PDC tooth that tooth is fitted tightly by two polycrystalline diamond layers is constituted, and is avoided that the problems referred to above, and the most efficient.
3, PDC tooth scrape cut as time there is good self-sharpening, the rate of wear of polycrystalline diamond layer be considerably slower than body.
The PDC tooth that PDC combination tooth is fitted by two polycrystalline diamond layers is constituted, and the centre of PDC combination tooth is hard, and wearability is high, and two
The body on limit is the softest, and wearability is weak, and this centre being easy to PDC combination tooth goes out sword, in making PDC combination tooth to remain
Between the good exposure of diamond.Cutting tooth on single-cone rotary drill bit in drill bit breaks rock work process, cutting tooth relative to rock it
Between scrape butt to being continually changing (the cutting tooth on gear wheel perseverance contact area scrape when cutting through rock relative to rock scrape butt to 0～
It is continually changing between 360 °；Cutting tooth on gear wheel alternately contact area scrape cut through rock time relative to rock scrape butt to 0～
Change between 180 °), during being continually changing, tooth top Pedicellus et Pericarpium Trapae can be blunt by rounding scraping butt for the hard-metal insert on gear wheel
Change, scrape and cut efficiency reduction.PDC combination tooth is for single cone, and that no matter cuts tooth scrapes butt to how to change, and it can be protected
Holding tooth top from sharp, diamond exposure is scraped and is cut through rock, and sharp keen state avoids passivation, its relative harder alloy to make tooth top remain
Dental transition is prone to invade rock, be easier to scrape and cut through rock.Therefore, the gear wheel of single-cone rotary drill bit uses PDC combination tooth energy substantially
While improving drilling life of bit, that improves Cutter scrapes the efficiency of breaking rock cutting efficiency and drill bit.Particularly this patent
Middle combination tooth is more than the thickness away from cone portion near the thickness of cone portion, farthest away from the both sides basis of the tip portion of gear wheel
Body thickness is respectively less than 2 times of middle polycrystalline diamond layer thickness, and the both sides body thickness being fixed in gear wheel is all higher than middle poly-
3 times of diamond layer thickness, thus composite tooth form becomes form wide under point on vertical section profile.Bottom with gear wheel consolidation
Both sides body layer thickness all much larger than polycrystalline diamond layer, provides the most firm power for polycrystalline diamond layer, and as court
To the top of the working position in shaft bottom, its both sides body layer the thinnest (or even thickness limit approaches zero) makes to combine tooth
When working in shaft bottom, the body layer of both sides, tip is the thinnest, and ratio pressure during combination tooth wedging (intrusion) rock is high, it is easy to wedging
Rock, is also beneficial to the relatively quick-wearing of body and goes out to expose middle polycrystalline diamond layer so that polycrystalline diamond layer can be as early as possible
Exposure and wedging stratum effectively, and utilize the self-sharpening of PDC tooth can improve to scrape and cut efficiency.
4, scrape due to the cutting tooth rock relatively under the compound motion that bit body rotates and gear wheel self rotates on single-cone rotary drill bit
Cutting motion, the cutting tooth on gear wheel scrapes butt to being continually changing relative to bottom rock.In this patent, PDC combination tooth is arranged
Time on gear wheel, the normal of the polycrystalline diamond layer binding face of PDC combination tooth combines the tooth at tooth set-point with this PDC on gear wheel
The angle of the normal of wheel contour surface is between 75-90 °.I.e. cutter profile at normal and the set-point of combination tooth binding face is bent
The normal in face is vertical or near vertical, namely the cutter profile curved surface at polycrystalline diamond layer binding face and the set-point of combination tooth
Normal parallel or close to parallel.So can ensure that the combination tooth on gear wheel is scraping butt under the compound movement being continually changing,
The polycrystalline diamond layer of combination tooth cuts through rock (class vertically or to carry out scraping close to vertical direction intrusion (wedging) rock all the time
Be similar to PDC tooth in Fig. 7 scrapes butt formula), the polycrystalline diamond layer of combination tooth weares and teares with this physical ability of both sides simultaneously, and weares and teares
Direction is along the direction (being perpendicular to the normal direction of polycrystalline diamond layer binding face) of polycrystalline diamond layer binding face.It can make group
Conjunction tooth makes full use of good the scraping of PDC and cuts performance and self-sharpening.If not above-mentioned set-up mode, PDC combination tooth will first wear and tear certain
Side body, after treating body wear, damage of then regrinding polycrystalline diamond layer, this will be unable to utilize excellent the scraping of PDC tooth to cut
Performance and self-sharpening, the most also can reduce the efficiency of breaking rock of single-cone rotary drill bit.Therefore, this patent can make full use of PDC tooth
Advantage, improves bit performance.
5, single-cone rotary drill bit only one of which gear wheel, it is easy to slim-hole, should be good drilling well in deep-well, ultra-deep well drilling
Instrument, but owing to single-cone rotary drill bit existing cutting tooth wears no resistance, scrapes that to cut through rock inefficient, limits single-cone rotary drill bit
Application effect, in wellbore construction, be therefore the most slowly rarely employed single-cone rotary drill bit.The PDC tooth of this patent is with glomerocryst gold
The mode that hard rock layer fits forms PDC and combines tooth, makes to be particularly well suited for scrape the form of cutting and breaks the PDC tooth of rock and can apply at single tooth
On wheel drill bit, improve efficiency of breaking rock and the service life of drill bit, this will widen the range of single-cone rotary drill bit, strengthen single
Rifler using value (particularly in deep-well) in drilling well.Meanwhile, because single-cone rotary drill bit is mainly scraped cuts through rock,
Cutting tooth on single cone scrape in shaft bottom cut long time and distance (the alternately cutting tooth on contact area) cut out again shaft bottom or
Scraping in shaft bottom always and cut (the cutting tooth on permanent contact area), single-cone rotary drill bit combines the combination of tooth with PDC, it is possible to be more suitable for PDC
The performance of combination tooth effect；And the composite drill bit that other drilling bit of multiple rollers or gear wheel are combined with other cutting structures, due to gear wheel
Rock is broken in mainly punching press, and PDC tooth is not suitable for punching press and breaks rock, and the effect of PDC combination tooth cannot give full play to.
As selection, the gear wheel of this patent is spherical.
As selection, the normal of the polycrystalline diamond layer binding face of PDC combination tooth combines at tooth set-point with this PDC on gear wheel
The angle of cutter profile normal to a surface is 90 ° (i.e. two normals are vertical).
As selection, the folder between polycrystalline diamond layer plane and the axial plane crossing this PDC combination tooth set-point of PDC combination tooth
Angle is at 45-90 °；Further, the polycrystalline diamond layer plane of PDC combination tooth and the axle crossing this PDC combination tooth set-point are put down
Angle between face is at 60-90 °；Further, the polycrystalline diamond layer plane of PDC combination tooth combines tooth with crossing this PDC
Angle between the axial plane of set-point is at 75-90 °；Especially, PDC combines the polycrystalline diamond layer plane of tooth and crosses this PDC
The axial plane of combination tooth set-point is vertical.The PDC combination tooth of this patent can have various arranged direction/angle, tooth on gear wheel
It is the longest that cutting tooth on wheel scrapes the distance cut in shaft bottom, and scrape cut during cut tooth and scrape butt to not relative to bottom rock
Changing, the polycrystalline diamond layer plane of PDC combination tooth is relatively big with the axial plane angle crossing this PDC combination tooth set-point or hangs down disconnectedly
Time straight, PDC combination tooth scrapes in shaft bottom that to cut scraping during the amount of cutting (scraping the volume cutting rock) smaller angle of rock big, wherein glomerocryst
Diamond layer plane combines the angle of the axial plane of tooth set-point close to arranged direction/angle when 90 ° or vertical with this PDC excessively
Most preferably, it is possible to maximize performance PDC combination tooth scrapes the ability of cutting.
As selection, PDC combination tooth is arranged on the permanent contact area of gear wheel.In the program, single-cone rotary drill bit breaks rock work process
In, the cutting tooth on gear wheel perseverance contact area contacts brokenly rock with shaft bottom all the time, and its rate of wear is faster than the cutting tooth on other regions.
PDC combination tooth is set on the permanent contact area of gear wheel the wearability that can significantly improve this region cutting tooth is cut efficiency with scraping, thus
Improve service life and the efficiency of breaking rock of drill bit.
As selection, PDC combination tooth is arranged on the alternately contact area of gear wheel.In the program, DC combination tooth is arranged on gear wheel
Alternately contact area on will can significantly improve the wearability of this region cutting tooth and scrape and cut efficiency.
As selection, the outside of the both sides body of PDC combination tooth is chamfered, and forms the PDC combination of up-narrow and down-wide wedge structure
Tooth.In the program, up-narrow and down-wide wedge structure makes the top narrower (thin) of PDC combination tooth more sharply, beneficially PDC
Combination tooth invades rock and improves drill bit efficiency of breaking rock.
As selection, the outside of the both sides body of PDC combination tooth is excised by inner concave curve, forms the PDC group of up-narrow and down-wide structure
Close tooth.In the program, the two ends body of PDC combination tooth is excised by inner concave curve, and the top making PDC combination tooth is more sharp-pointed, has
It is beneficial to PDC combination tooth and invades rock raising drill bit efficiency of breaking rock.Meanwhile, the PDC that two ends body is excised by inner concave curve combines
Tooth, slow from the increase of tooth top down transverse tooth thickness.When PDC combination tooth has abrasion, body indent excision in both sides can slow down cutting
The speed that tooth transverse tooth thickness increases, makes the tooth top thickness that tooth can persistently keep relatively thin of cutting after abrasion, and holding cutting tooth invades rock
Ability, is conducive to improving the efficiency of breaking rock of drill bit.
As selecting further, the both sides body of PDC combination tooth is excised by the inner concave curve of multistage curve combination, in formation
The PDC of narrow lower wide structure combines tooth.
Selecting further as another, the both sides body of PDC combination tooth is cut by the inner concave curve of curve and Straight Combination
Removing, the PDC forming up-narrow and down-wide structure combines tooth.
Aforementioned main formula case of the present invention and each further selection scheme thereof can be the present invention with independent assortment to form multiple schemes
Can use and claimed scheme；And the present invention each non conflicting select between and and other select can in any combination,
Those skilled in the art can understand there is multiple combination according to prior art and common knowledge after understanding the present invention program, is this
Invent claimed technical scheme, do not do at this exhaustive.
Accompanying drawing explanation
Fig. 1 is the structural representation of the embodiment of the present invention 1；
Fig. 2 is that the PDC of the embodiment of the present invention 1 combines toothing schematic diagram；
Fig. 3 is the structural representation of the PDC combination tooth of the embodiment of the present invention 2；
Fig. 4 is the structural representation of the PDC combination tooth of the embodiment of the present invention 3；
Fig. 5 is that the gear wheel of single-cone rotary drill bit contact area when contacting with bottom rock divides schematic diagram；
Fig. 6 is conventional PDC toothing schematic diagram；
Fig. 7 is that conventional PDC tooth normally scrapes schematic diagram when cutting through rock；
In figure: 1, bit body, 2, gear wheel, 21, permanent contact area, 22, alternately contact area, 3, PDC combine tooth；31、
Body, 32, polycrystalline diamond layer；4, rock.
Detailed description of the invention
Following non-limiting examples is used for the present invention is described.
Embodiment 1:
With reference to Fig. 1, shown in 2, a kind of single-cone rotary drill bit with PDC combination tooth, including bit body 1 and gear wheel 2, gear wheel
2 with bit body 1 for being rotationally connected, gear wheel 2 is provided with cutting tooth, the cutting tooth on gear wheel 2 at least one be PDC group
Closing tooth 3, as preferably, all PDC of cutting tooth on gear wheel 2 combine tooth 3 (with reference to shown in Fig. 1)；PDC combines tooth 3
Being combined by two PDC teeth, PDC tooth is by body 31 and polycrystalline diamond layer 32 structure of the covering whole supporting surface of body 31
Becoming (i.e. in figure, polycrystalline diamond layer 32 covers the whole end face of body 31), the compound mode of two PDC teeth is polycrystalline diamond
Layer 32 fits tightly, and is clamped in four layers of sandwich structure by two bodies 31 in outside, and the thickness of close cone portion is more than
Away from the thickness of cone portion, with reference to shown in Fig. 2, in being respectively less than farthest away from both sides body thickness W1 of the tip portion of gear wheel
Between 2 times of polycrystalline diamond layer thickness W3, both sides body thickness W2 being fixed in gear wheel is all higher than middle polycrystalline diamond
3 times of layer thickness W3；As preferably, as shown in this embodiment, the outside of the both sides body 31 of PDC combination tooth is chamfered,
The PDC forming up-narrow and down-wide wedge structure combines tooth.When PDC combination tooth is arranged on gear wheel, the glomerocryst gold of PDC combination tooth
The normal of hard rock layer binding face and this PDC on gear wheel combine the angle of the cutter profile normal to a surface at tooth set-point at 75-90
Between °.
Embodiment 2:
The present embodiment is substantially the same manner as Example 1, and its difference is: the outside of the both sides body 31 of PDC combination tooth is by indent
Curve excises, and the PDC forming up-narrow and down-wide structure combines tooth.As selection, with reference to shown in Fig. 3, the both sides of PDC combination tooth
Body 31 is excised by the inner concave curve of multistage curve combination, and the PDC forming up-narrow and down-wide structure combines tooth.
Embodiment 3:
The present embodiment is substantially the same manner as Example 1, and its difference is: the outside of the both sides body 31 of PDC combination tooth is by indent
Curve excises, and the PDC forming up-narrow and down-wide structure combines tooth.As selection, with reference to shown in Fig. 4, the both sides of PDC combination tooth
Body 31 is excised by the inner concave curve of curve and Straight Combination, and the PDC forming up-narrow and down-wide structure combines tooth.
Embodiment 4:
With reference to shown in Fig. 5, the present embodiment is essentially identical with embodiment 1 to 4, and its difference is: PDC combination tooth is arranged on tooth
On the permanent contact area 21 (region that gear wheel contacts all the time with shaft bottom) of wheel 2, or, PDC combination tooth is arranged on gear wheel 2
Alternately on contact area 22 (region that gear wheel alternately contacts with shaft bottom).
Embodiment 5:
The present embodiment is essentially identical with embodiment 1 to 4, and its difference is: the polycrystalline diamond layer plane of PDC combination tooth and mistake
Vertically (i.e. PDC combination tooth combines tooth half-twist, figure relative to the PDC in Fig. 1 to the axial plane of this PDC combination tooth set-point
The polycrystalline diamond layer plane of the PDC combination tooth in 1 is parallel with the axial plane crossing this PDC combination tooth set-point or overlaps).
The foregoing is only presently preferred embodiments of the present invention, not in order to limit the present invention, all spirit in the present invention and
Any amendment, equivalent and the improvement etc. made within principle, should be included within the scope of the present invention.
Claims (10)
1. have PDC combination tooth a single-cone rotary drill bit, including bit body and gear wheel, gear wheel and bit body for being rotationally connected, gear wheel
On be provided with cutting tooth, it is characterised in that: the cutting tooth on gear wheel at least one be PDC combine tooth, PDC combination tooth by two
PDC tooth combines, and PDC tooth is by body and covers the polycrystalline diamond layer of body supporting surface 60% area above and constitutes, two
The compound mode of PDC tooth is that polycrystalline diamond layer fits tightly, and is clamped in four layers of sandwich structure by two bodies in outside, and leans on
The thickness of nearly cone portion is respectively less than more than the thickness away from cone portion, the both sides body thickness farthest away from the tip portion of gear wheel
2 times of middle polycrystalline diamond layer thickness, the both sides body thickness being fixed in gear wheel is all higher than middle polycrystalline diamond layer thickness
3 times；The normal of the polycrystalline diamond layer binding face of PDC combination tooth and this PDC on gear wheel combine the gear wheel wheel at tooth set-point
The angle of the normal of contour curved surface is at 75-90 °.
There is the single-cone rotary drill bit of PDC combination tooth the most as claimed in claim 1, it is characterised in that: the glomerocryst Buddha's warrior attendant of PDC combination tooth
The angle that the normal of rock layers binding face combines the cutter profile normal to a surface at tooth set-point with this PDC on gear wheel is 90 °.
There is the single-cone rotary drill bit of PDC combination tooth the most as claimed in claim 1 or 2, it is characterised in that: the glomerocryst of PDC combination tooth
Angle between diamond layer plane and the axial plane crossing this PDC combination tooth set-point is at 45-90 °.
There is the single-cone rotary drill bit of PDC combination tooth the most as claimed in claim 3, it is characterised in that: the glomerocryst Buddha's warrior attendant of PDC combination tooth
Angle between rock layers plane and the axial plane crossing this PDC combination tooth set-point is at 60-90 °.
There is the single-cone rotary drill bit of PDC combination tooth the most as claimed in claim 4, it is characterised in that: the glomerocryst Buddha's warrior attendant of PDC combination tooth
Rock layers plane is vertical with the axial plane crossing this PDC combination tooth set-point.
There is the single-cone rotary drill bit of PDC combination tooth the most as claimed in claim 1, it is characterised in that: PDC combination tooth is arranged on gear wheel
Permanent contact area on.
There is the single-cone rotary drill bit of PDC combination tooth the most as claimed in claim 1, it is characterised in that: PDC combination tooth is arranged on gear wheel
Alternately contact area on.
There is the single-cone rotary drill bit of PDC combination tooth the most as claimed in claim 1, it is characterised in that: the both sides body of PDC combination tooth
Outside be chamfered, formed up-narrow and down-wide wedge structure PDC combine tooth.
There is the single-cone rotary drill bit of PDC combination tooth the most as claimed in claim 1, it is characterised in that: the both sides body of PDC combination tooth
Outside excised by inner concave curve, formed up-narrow and down-wide structure PDC combine tooth.
There is the single-cone rotary drill bit of PDC combination tooth the most as claimed in claim 9, it is characterised in that: the both sides of PDC combination tooth are originally
Body is formed by multistage curve combination or is excised by the inner concave curve of curve and Straight Combination, forms the PDC of up-narrow and down-wide structure
Combination tooth.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610349072.6A CN105804663B (en) | 2016-05-24 | 2016-05-24 | A kind of single-cone rotary drill bit with PDC combination teeth |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610349072.6A CN105804663B (en) | 2016-05-24 | 2016-05-24 | A kind of single-cone rotary drill bit with PDC combination teeth |
Publications (2)
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| CN105804663A true CN105804663A (en) | 2016-07-27 |
| CN105804663B CN105804663B (en) | 2018-01-09 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201610349072.6A Active CN105804663B (en) | 2016-05-24 | 2016-05-24 | A kind of single-cone rotary drill bit with PDC combination teeth |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106639887A (en) * | 2016-11-25 | 2017-05-10 | 西南石油大学 | Drill bit with rotary teeth and single roller cone |
| CN110728076A (en) * | 2019-11-01 | 2020-01-24 | 西南石油大学 | Method for calculating bottom hole rock support dimension |
| CN113405895A (en) * | 2021-05-31 | 2021-09-17 | 西南石油大学 | A anchor clamps for scraping cut and strike compound broken rock test |
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| CN204386476U (en) * | 2015-01-15 | 2015-06-10 | 西南石油大学 | A kind of PDC combined based on on-plane surface strengthens the single-cone rotary drill bit of tooth |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106639887A (en) * | 2016-11-25 | 2017-05-10 | 西南石油大学 | Drill bit with rotary teeth and single roller cone |
| CN106639887B (en) * | 2016-11-25 | 2018-09-14 | 西南石油大学 | Rotary teeth single-cone rotary drill bit |
| CN110728076A (en) * | 2019-11-01 | 2020-01-24 | 西南石油大学 | Method for calculating bottom hole rock support dimension |
| CN110728076B (en) * | 2019-11-01 | 2022-07-05 | 西南石油大学 | Method for calculating bottom hole rock support dimension |
| CN113405895A (en) * | 2021-05-31 | 2021-09-17 | 西南石油大学 | A anchor clamps for scraping cut and strike compound broken rock test |
| CN113405895B (en) * | 2021-05-31 | 2022-11-04 | 西南石油大学 | A anchor clamps for scraping cut and strike compound broken rock test |
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| Publication number | Publication date |
|---|---|
| CN105804663B (en) | 2018-01-09 |
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