CN205532310U - Long -life drill bit with self -reparing capability - Google Patents

Abstract

The utility model discloses a long -life drill bit with self -reparing capability belongs to drilling equipment technical field such as oil and natural gas, mine engineering, building foundation engineering construction, geology, the hydrology, including bit body and at least one wing, be provided with a plurality of first groups cutting teeth on the wing, the wing cloth flank of tooth and/or wing gauge protection surfaces set up the slot and are used for fixed first group cutting teeth, are provided with at least one dead slot and at least one second group cutting teeth on at least one wing, set up the slot in the dead slot and be used for fixed second and organize the cutting teeth, and the second are organized the at least partial cutting edge of cutting teeth and are outcropped in the dead slot internal surface. The utility model discloses can be after the regional cutting teeth of drill bit wear and tear completely, new cutting teeth outcrops naturally, realizes the selfreparing of drill bit, and the drill bit behind messenger's " selfreparing " can last the high efficiency and creep into.

Description

A kind of long-life drill bit with self-reparing capability

Technical field

This utility model belongs to the drilling equipments such as petroleum gas, mine engineering, building foundation engineering construction, geology, the hydrology Technical field, concretely relates to a kind of long-life drill bit.

Background technology

PDC drill bit is one of bit tool the most frequently used in drilling engineering, particularly in current oil, gas drilling engineering In, the footage drilled acquired by PDC drill bit has accounted for more than the 80% of oil/gas drilling total footage, occupies absolutely essential ground Position.

PDC drill bit mainly by drill body, connect screw thread and wing and the composite polycrystal-diamond that is arranged on wing (i.e. PDC tooth, hereinafter also referred to as cutting tooth or composite sheet) composition.The wing of PDC drill bit includes the operate wing and secondary wing, it The main distinction be the radial view at drill bit, extend to drill bit heart portion (or close to drill bit heart portion) wing be referred to as For the operator wing, the most secondary wing of other wings.

When PDC drill bit does radially Tooth arrangement design, wherein a critically important design curve is called " cutting of PDC drill bit Cut contour line ", in PDC drill bit cloth tooth coverage diagram, i.e. respectively cut the curve that tooth land contour line is tangent with drill bit, it is possible to regard For envelope curve cutting tooth land contour line each on drill bit.The cutting wheel profile of drill bit represents the base in the got out shaft bottom of drill bit This profile shape characteristic.Additionally, " wing contour line " is also a key character curve of PDC drill bit, cutting tooth consolidation On wing, it is beyond the exposure part that part is tooth of wing contour line, and the proud exposure of cutting tooth is to determine that drill bit invades The key factor of rock ability.Generally, most of region of wing contour line and the cutting wheel profile of drill bit is parallel or Close to parallel.According to design custom, generally cutting wheel profile and the wing contour line of drill bit are divided into four regions (curved section), I.e. inner cone region, crown region, shoulder regions and gage areas.

The index weighing PDC drill bit service behaviour mainly has two, and one is drilling speed, another working life, and affects PDC The factor of bit operation performance mainly includes the performance parameter (based on wearability and impact resistance) of PDC tooth, PDC tooth Structural parameters (diameter of tooth, profile of tooth etc.), cutter set density and cloth tooth mode.And when PDC drill bit designs, need comprehensive Consider concrete drilling condition (especially formation condition), and select accordingly suitably cutting tooth specifications and models, cutter set density and Cloth tooth mode.In PDC drill bit rock drilling process, along with the abrasion of Cutter, drilling speed is gradually reduced.Logical common drill bit The wear extent of upper each region PDC tooth diameter is as the basic foundation of its wear evaluation Yu classification.PDC drill bit belongs to fixing cutting Teeth drill bit, if the PDC odontotripsis on drill bit regional area is totally, the cutting power of drill bit is i.e. lost.When PDC bores Head bore meet bad ground (as soft or hard replace stratum, hard abrasive formation, containing gravel sandwich etc.) time, on PDC drill bit cut Abrasion or the rate of decay of tooth dramatically speed up, thus cause bit life shorter, and drilling depth is on the low side.

When, after the cutting tooth generation noticeable wear on drill bit, the efficiency of breaking rock of drill bit declines immediately.One can make drill bit break rock effect The method that rate is recovered is to repair drill bit.The method repaired is to change worn-out cutting tooth into new tooth again to weld In socket on wing body, or the non-wear surface of old tooth is adjusted to work surface, and (worn-out part is positioned in socket, new sword Mouth goes to outside) again weld.So, worn-out drill bit is just repaired into one " green bit ".Implement drill bit reparation to lead to Often there are two conditions: one, the wing body of drill bit does not occurs noticeable wear；They are two years old, it is necessary to can enter after being tripped out by drill bit Row is repaired.

Different from the diamond-impregnated bit for extremely hard formation, PDC drill bit belongs to the cutting tooth of table edge formula drill bit, i.e. drill bit Inlay (mainly welding) on the bizet surface of drill bit, the cutting tooth of bit face and rock contact implement during normal work Cutting function, and wing body does not the most contact rock, unless cutting tooth has occurred and that bigger abrasion.

Chinese patent 200620033337.3 discloses one and " has the polycrystalline diamond compact bit of secondary gear structure ", should Scheme described in patent is designed as two groups of composite polycrystal-diamonds at the cutting tooth that drill bit is front-seat and is longitudinally arranged, and one of which is one Level tooth, another group is secondary gear, and an one-level tooth and a secondary gear are grouped together into continuous cutting structure.The program By the way of arranging secondary gear on wing, add the composite sheet quantity that drill bit is total, and do not affect at the beginning of drill bit in secondary gear In the case of beginning wedging ability, improve the wear height of drill bit key area composite sheet, serve prolongation drilling life of bit, Increase the purpose of drilling depth.

Chinese patent 200720082270.7 discloses one, and " polycrystalline diamond with the longitudinal standby cutting structure of stand alone type is multiple Close sheet drill bit ", scheme described in this patent is longitudinally disposed above drill bit main cutting toothing comprises some standby cutting tooth Standby cutting structure, standby cutting tooth is directly fixed on wing body, but and be not in contact with each other with between the main cutting tooth of wing, Or only exist point, linear contact lay.In the program, the setting of standby cutting tooth not only considerably increases diamond layer on wing body Effectively wear and tear length, also widened the design alternative scope of standby cutting structure, thus improve drill bit at complicated bad ground In service life.

Chinese patent CN200980146022.6 discloses one and " has the drill bit of continued sharpness edge cutting original paper ", and this is special The described scheme of profit, mainly for the abrasion optimization of PDC drill bit zones of different, is distributed with polycrystalline diamond cumulative volume respectively, is combined Sheet mutual spacing, drill bit tapering cutting original paper distributed number and wing quantity are criterion, using the glomerocryst gold as cutting element Hard rock composite sheet is distributed in the regions such as the inner cone of drill bit, nose, shoulder and gauge in a specific way, so that drill bit wing exists When wearing depth exceedes first row cutting element, the second row cutting element being fixed in wing body is contacted and broken formation Rock.By this design increasing longitudinal standby cutting original paper element on wing, this patent can effectively extend making of drill bit Use the life-span.

Above-mentioned patent all proposes different improvement projects for prolongation bit life, but weighs the key factor that drill bit is good and bad Except service life, its rate of penetration no less important, and determine the cutting tooth pair that it is critical only that on drill bit of drill bit rate of penetration The intrusion of rock or wedging ability, it directly affects the drilling efficiency of drill bit.Determine cutting tooth wedging ability important because of One of element is exactly and ratio pressure between bit teeth and rock, the footprint pressure i.e. under the pressure of the drill effect, between tooth and rock.Than pressure The wedging ability being worth the biggest drill bit is the strongest, and drilling efficiency is the highest.Under the conditions of same the pressure of the drill, connecing between drill bit and rock Contacting surface is long-pending the least, then bigger than pressure.In above-mentioned patent formula, secondary gear (or standby cutting tooth) is directly embedded into solid Being scheduled on wing body, when secondary gear plays shear action, the wing body around secondary gear the most directly participates in contacting bottom rock And wear and tear, therefore share substantial amounts of the pressure of the drill, made to be applied directly to being greatly reduced than pressure value on cutting tooth, cause two The wedging ability of level tooth is substantially less than the table edge cutting tooth of drill bit, although thus drill bit remains to work, but its efficiency of breaking rock is notable Less than unworn green bit.

Utility model content

The purpose of this utility model is: proposing a kind of long-life drill bit with self-reparing capability, the program can be at drill bit After the cutting tooth in certain region is completely worn out, new cutting tooth nature exposure, it is achieved the selfreparing of drill bit, after making " selfreparing " Drill bit can continue efficiently to creep into.

This utility model purpose is realized by following technical proposals:

A kind of long-life drill bit with self-reparing capability, including bit body and at least one wing, wing is provided with some the One group of cutting tooth, the wing cloth flank of tooth and/or wing gage surface arrange recess in order to fix first group of cutting tooth, at least one wing On be provided with at least one dead slot and at least one second group cutting tooth, arrange in dead slot recess in order to fix second group cutting tooth, And second group cutting tooth at least part of cutting edge exposure in dead slot inner surface (include cutting edge portion separate dew and whole exposures, its In: cutting edge proud exposure is more than zero and less than cutting edge height overall, referred to as part exposure；Cutting edge proud exposure more than or etc. In cutting edge height overall, whole exposures).

The key point of this patent is: after first group of cutting tooth in drill bit region is completely worn out, cut for second group of relevant position Cut tooth nature exposure, it is achieved the selfreparing of drill bit, enable the drill bit after " selfreparing " to continue efficiently and creep into.

This patent drill bit includes bit body and several wings.Wherein: arrange on the wing cloth flank of tooth and/or wing gage surface There is recess (the wing cloth flank of tooth is made up of wing inner cone region, crown region, shoulder regions), be fixed with first group in recess and cut (recess in order to fixing cutting tooth, such as first group cutting tooth, imbed in wing with cutting tooth by its degree of depth and aperture area to cut tooth Part coupling), that is (" table edge " is i.e. arranged in outside drill bit as first group of cutting structure cutting tooth of drill bit initial table edge Surface, during bit operation, the cutting original paper of table edge or structure directly contact with shaft bottom and break rock)；If being provided with on wing body A dry dead slot, second group of cutting tooth is fixed on (hinge structure in described dead slot with the form of at least part of cutting edge exposure In be completely embedded in wing body standby tooth/secondary gear etc., the design of dead slot make to put on the pressure of the drill of second group of cutting tooth not by Wing body about absorbs, that is ratio pressure not relative first group of cutting because of the existence of neighbouring wing body of second group of cutting tooth Tooth substantially reduces).As drill bit initial table edge structure successor list edge cutting structure (" follow-up " i.e. when initial table edge cutting knot After structure lost efficacy, replace failed initial table edge structure with high specific pressure state fractured rock).When drill bit wing weares and teares more than first During group cutting tooth, second group of cutting tooth of relevant position quickly comes out, with sharp keen high specific pressure state rock cutting.By Initial table edge cutting structure and the successor list formed by second group of cutting tooth of first group of cutting tooth formation inlay the common structure of cutting structure Become the serial cutting structure of drill bit.

Use this patent scheme, PDC drill bit in lasting drilling process, first group cutting tooth as initial table is inserted will first Wear and tear, when wear height reach first group cutting tooth initial proud exposure time, the wing body of drill bit just with main cutting Tooth together weares and teares, until described dead slot structure is completely exposed to wing external body so that dead slot surface replaces initial cutter Flank face, second group simultaneously arranged in dead slot cutting tooth, as successor list edge cutting tooth, forms new wing cutting structure, That is successor list edge cutting structure.After the initial table edge cutting structure of first group of cutting tooth composition and second group of cutting tooth are constituted The cutting structure that continues successively acts on bottom rock, defines the serial cutting structure of drill bit.With reference to shown in Fig. 8, along with wing The continued wear of body, follow-up cutting structure just comes into contact with bottom rock and persistently creeps into.Due to second group of cutting in dead slot Tooth has certain proud exposure relative to dead slot surface, so when it starts to cut brokenly rock, only a fraction wing body Contact with bottom rock, thus major part drill bit the pressure of the drill is assigned on second group of cutting tooth.With existing internally-inlaid secondary gear Or standby cutting tooth technology compares, successor list that this utility model the is proposed edge cutting structure main cutting tooth in drill bit region After completely worn out, natural exposure second group cutting tooth, and with the high specific pressure state cutting identical or close with first group of cutting tooth Rock, thus realize the self-repair procedure of drill bit.

Preferably 1, at least one wing is provided with a dead slot, described dead slot is passing through of through wing front and back sides The groove of formula；Or the groove that described dead slot is not communicating structure；Rare one second it is fixed in each dead slot Group cutting tooth.In the program, second group of cutting tooth exposure is in dead slot surface (see Fig. 6,8), rather than is completely embedded in wing Internal (seeing Fig. 7), the design of dead slot makes the pressure of the drill putting on second group of cutting tooth not absorbed by wing body about, That is the ratio pressure of second group of cutting tooth does not substantially reduce because of the existence of neighbouring wing body so that the work bar of second group of cutting tooth Part is consistent with main cutting tooth or close, that is the wing body near dead slot interior cutting tooth is not involved in contacting rock, second group of cutting Form rock cutting is inlayed with table, so that second group of cutting tooth does not has for creeping into first group of cutting tooth more relative than pressure during tooth work Substantially reduce, while ensureing cutting tooth wedging ability, improve the service life of drill bit.

Preferably 2, at least one wing is provided with two or more dead slot, at least two dead slots are arranged At different drill bit radial zones, in each dead slot, fix at least one second group cutting tooth.In the program, on wing body It is provided with two or more mutual discontinuous dead slot structures, the dead slot because offering on wing can be avoided excessive or long The danger that the wing structural strength caused excessively reduces and causes wing to break.

Preferably 3, at least one wing is provided with at least one dead slot, described dead slot and second group of cutting tooth cloth thereof Put the radial zone beyond drill bit three/Radius, in each dead slot, fix at least one second group cutting tooth.Due to PDC Drill bit has its particularity when crown region cloth tooth, and the cutting tooth being i.e. positioned at drill bit crown region is in drill bit entirety cutting structure Region of stress concentration, subject higher chip-load；And the cutting tooth in this region is positioned at the least significant end of drill bit, to stratum The change (as soft or hard replaces stratum, containing gravel stratum etc.) of lithology is more sensitive, and cutting tooth is susceptible to collapse the abnormal mistakes such as damage Effect phenomenon.In the program, second group of cutting tooth is arranged in the region beyond drill bit radial direction 1/3rd, when outside PDC drill bit When the main cutting tooth in region, portion and body occur abrasion and expose dead slot, second group of cutting tooth in this region is just as successor list Edge cutting tooth, replaces the main cutting tooth in this region to work on high specific pressure state, it is achieved thereby that drill bit is in crown and in addition The autonomous reparation in region, while ensure that drill bit wedging stratum ability, extends bit life.

Preferably 4, at least one wing is provided with at least one dead slot, described dead slot and second group of cutting tooth cloth thereof Put the radial zone within drill bit 2/3rds radius, in each dead slot, fix at least one second group cutting tooth.At some Under special operation condition, during combined drilling, owing to inner cone and the heart portion region number of teeth of PDC drill bit are less, working condition is multiple Miscellaneous, this region cutting tooth usually can occur Fast Wearing.In the program, second group of cutting tooth is arranged in radially three points of drill bit Two within region, as the follow-up cutting structure in this region, it is possible to first group cutting odontotripsis totally after, continue with Be equal to or work on close to the high specific pressure state of first group of cutting tooth, it is achieved that drill bit inner cone and region, heart portion from Major in multiple, thus extend PDC drill bit service life under the special operation conditions such as combined drilling.

Preferably 5, second group of cutting tooth is arranged in the whole of drill bit or close to whole radial zones, and formation is completely or base This complete shaft bottom radially covers.Specifically, at least one wing is provided with at least one dead slot, single wing or each Dead slot on wing is arranged in summation and covers the whole of drill bit or nearly all of radial zone, in each dead slot fixing at least one Second group cutting tooth, forms complete or the most complete shaft bottom and radially covers.In the program, whole or nearly all of Second group of cutting tooth all it is disposed with so that the follow-up cutting structure being made up of second group of cutting tooth is cut main in drill bit radial zone After cutting tooth and blade surface abrasion totally, it is possible to the initial table edge cutting structure that comprehensive replacement is made up of main cutting tooth, with High specific pressure state rock cutting, makes drill bit whole or realize autonomous reparation close to whole radial zones, thus is ensureing drill bit While wedging ability, significantly extend its life-span.

Preferably 6, first group of cutting tooth forms the first cutting profile, and described second group of cutting tooth forms the second cutting wheel Wide or even more cutting profiles, each cutting profile is longitudinally staggeredly arranged.Specifically, at least one wing is provided with two Or two or more dead slot, fix at least one second group cutting tooth, described dead slot and second group of cutting tooth thereof in each dead slot and exist Drill bit is axially arranged by echelon, and echelon number is more than or equal to 2, and second group of cutting tooth of each echelon is arranged according to same contour line, And respectively cutting profile the most mutually staggers along drill bit.In the program, first group of cutting tooth forms the first cutting profile on wing； Second group of cutting tooth is arranged on wing by echelon, the cutting profile of second group of cutting tooth each self-forming independence of each echelon, All after the cutting odontotripsis of previous echelon is totally, cutting structure fractured rock can be inlayed as successor list, so that drill bit exists Different phase is provided with self-reparing capability, extends the life-span of drill bit further.

Preferably 7, at least one wing is provided with two or more dead slots, described dead slot is on drill bit wing Intensive layout, and the type of each second group of cutting tooth is multiple.In the program, first group of cutting tooth forms first on wing and cuts Cut profile；Second group of cutting tooth is fixed on wing by the mode of intensive layout, considerably increases the cutter set density of single wing, On the other hand, due to second group of cutting tooth at drill bit axially, radially mutually stagger, and it is formed without clear and definite cutting profile, often Individual dead slot exposes and be secured within second group cutting tooth after closing on the abrasion of wing body the most in succession so that with wing and On adjacent blades second group cutting tooth at drill bit axially, the most overlapping, exposure in succession, make drill bit with high specific pressure While state rock cutting, it is possible to the most independently repair eroded area, thus significantly extend bit life.

Preferably 8, the recess that wing is fixed with first group of cutting tooth is connected with the dead slot being fixed with second group of cutting tooth Logical.In the program, first group cutting tooth socket be connected with dead slot reduce first group cut tooth connect with the actual of wing body Contacting surface amasss (solder side area), and therefore when first group of cutting odontotripsis amount exceedes its proud exposure, wing body will be sent out with rock Raw contact is also worn and torn, and along with the increase of wear extent, the area of cutting tooth solder side is gradually reduced, and cutting tooth consolidation strength is gradually Reducing, socket is connected with dead slot and first group of cutting tooth will be made just to come off from wing body before all having worn and torn, thus faster Realize the exposure of second group of cutting tooth in dead slot, and then improve drill bit and realize the efficiency of " selfreparing ".

Preferably 9, on the medial surface and gage surface of wing, set dead slot is the open slot do not closed, and is opening Second group of cutting tooth it is fixed with in mouth groove.In the program, the surface of gage areas on gage surface the most major and minor wing body, Medial surface then refers mainly to the blade surface on secondary wing near region, drill bit heart portion.Medial surface and gage surface cloth at wing are empty Groove and second group of cutting tooth can not only increase by second group of this region and cut the cutter set density of tooth, more can be at first group of cutting tooth mill After damaging totally, collectively form include the cutting of heart portion, complete brill including gauge function with the second of other regions group of cutting tooth Head cutting structure, so that drill bit possesses self-reparing capability in gauge and region, heart portion.

Preferably 10, at least one wing is provided with at least one dead slot, circumferentially fixed along drill bit in described dead slot Second group of cutting tooth of two or more rows.Wherein, front-seat and heel row cutting tooth can phase along the working depth of drilling direction With, it is also possible to different.In the program, second group cutting tooth arranging corresponding with dead slot is front two rows or more, if front-seat Second group cutting tooth contour with rear toothrow, then front two rows cutting tooth will main cutting tooth and blade surface abrasion totally after, Scrape simultaneously as follow-up cutting tooth simultaneously and cut rock；Ranked second group cutting tooth after and if be less than front toothrow, then when front-seat second group Odontotripsis is to after to a certain degree, and rear toothrow will enter rock break-off process immediately, further enhances second group of cutting tooth to bit cutting The repair of ability.Both cutting tooth arrangements are all conducive to extending the life-span of PDC drill bit, depending on operating mode, and can Select second group of optimal cutting tooth relative altitude arrangement.

Preferably 11, at least one wing is provided with at least one dead slot, circumferentially fixed along drill bit in described dead slot Second group of cutting tooth of two or more rows.Wherein, front-seat and heel row cutting tooth can phase along the working depth of drilling direction With, it is also possible to different.In the program, be front two rows or more with in dead slot second group cutting tooth, if before ranked second group Cutting tooth is contour with rear toothrow, then front two rows cutting tooth will be made after main cutting tooth and blade surface wear and tear totally simultaneously Scrape for follow-up cutting tooth simultaneously and cut rock；Ranked second group cutting tooth after and if be less than front toothrow, then when second group of front-seat odontotripsis After to a certain degree, rear toothrow will enter rock break-off process immediately, further enhance second group of cutting tooth to bit cutting ability Repair.Both cutting tooth arrangements are all conducive to extending the life-span of PDC drill bit, depending on operating mode, may select Second group of good cutting tooth relative altitude arrangement.

Preferably 12, described drill bit is for comprising gear wheel/wing composite drill bit, dise knife/wing composite drill bit, rushing rotary drill First-class at the interior drill bit with the motion cutting unit rotating relative to bit body or translating.

As preferably side 13, described drill bit refers in particular to as a kind of PDC drill bit with fixed enlarging while drilling structure, fixed The inner side of enlarging while drilling PDC drill bit neck eye section cutting structure is provided with dead slot, is fixed with second group of cutting tooth in this dead slot； Or the inner side of fixed enlarging while drilling PDC drill bit reaming section cutting structure is provided with dead slot, in this dead slot, it is fixed with second Group cutting tooth；Or dead slot is set in neck eye section and the inner side of reaming section cutting structure simultaneously, and it is fixed with second group simultaneously and cuts Cut tooth.

As aforementioned main formula case and the further preferred scheme 14 of each preferred version, the geometry of described dead slot can be circular, One or more in the shapes such as groove type, sector, crescent.In the program, the dead slot structure of groove type can be with drill bit The inner cone region of wing contour line and shoulder regions adapt, it is simple to preferably cloth is setting in wing inner cone region and shoulder regions Second group cutting tooth；Fan-shaped dead slot structure can adapt with the crown region of bit wing wing curve, it is simple to preferably cloth Second group of cutting tooth setting in wing crown region；Crescent dead slot structure can make drill bit excessively arrive in wing body wear Second group of cutting tooth contact bottom rock also starts brokenly gradually transition during rock creeps into, namely the brill on second group of cutting tooth Pressure (than pressure) gradually applies up, effectively prevent as key-way shape dead slot structure or circular arc dead slot structure because cutter is empty Groove bottom blades body abrasion after, be suddenly applied in the pressure of the drill short time second group cutting tooth on, impact collapse damages, take off The generation of the cutting tooth Problem of Failure such as layer.

As aforementioned main formula case and the further preferred scheme 15 of each preferred version, described cutting tooth can be that conventional circular is combined Sheet, it is also possible to be the non-circular profile flush cut tooth such as oval tooth, point knuckle-tooth.

As aforementioned main formula case and the further preferred scheme 16 of each preferred version, described cutting tooth can be conventional plane tooth top Composite sheet, it is also possible to be to there is taper tooth top or spherical tooth top etc. there is the cutting tooth of three-dimension curved surface bizet.In the program, bent Face tooth top tooth is especially preferred with taper, ball-like diamond composite teeth.When second group of cutting tooth is pyramidal diamond composite teeth, Can individually be arranged in dead slot, it is also possible to before being arranged in plane tooth top composite sheet when ranked second group cutting tooth in dead slot more Side or rear, provide the effect of rock precrushing, thus improve efficiency of breaking rock for follow-up cutting tooth；When second group of cutting tooth is During sphere composite teeth, can have in dead slot when ranked second group cutting tooth more and be arranged in the rear of plane tooth top composite sheet as buffering Tooth, absorbs unnecessary the pressure of the drill for around cutting tooth, thus protects cutting tooth, extend bit life.

As aforementioned main formula case and the further preferred scheme 17 of each preferred version, described cutting tooth can be PDC composite sheet, TSP cutting tooth, diamond composite teeth (typically refer to by polycrystalline diamond layer and hard alloy substrate institute structure The on-plane surface crown tooth become, such as sharp cone distal bizet composite teeth, spherical bizet composite teeth etc.), natural diamond cutting tooth, impregnated Adamas cutting tooth, carbide cutting tooth, cubic boron nitride cutting tooth, ceramic cutting tooth, or comprise diamond or The cutting tooth of cubic boron nitride.

Aforementioned this utility model main formula case and each further preferred scheme thereof can be this reality with independent assortment to form multiple schemes Use and claimed scheme with novel: such as this utility model, except it will be apparent that opposition preferred version between (such as Preferred version 3 and 4 can only select one), each preferred version can be with other preferred version combination in any, and those skilled in the art exist Can understand there is multiple combination according to prior art and common knowledge after understanding this utility model scheme, be this utility model and wanted The technical scheme of protection, does not do exhaustive at this.

The beneficial effects of the utility model: by offering some dead slots in bit wing wing body, and be fixed with second group in dead slot Cutting tooth, this organization plan mainly has the advantages that:

(1) organization plan that this utility model is proposed, on the premise of being not take up first group of cutting tooth cloth tooth space, introduces Dead slot structure, and by arranging second group of cutting tooth in dead slot, wing forms successor list edge cutting structure.Dead slot Second group of interior cutting tooth is not only added significantly to the cutter set density of drill bit, and as follow-up cutting structure, cuts at first group Cutting tooth and after neighbouring wing body wears up to a certain degree, second group of cutting tooth exposure in dead slot surface and can form new table edge Cutting structure, so that the drill bit of first group of cutting tooth heavy wear is able to " reparation ".After drill bit " is repaired ", second Group cutting tooth can with equivalent or close to the sharp keen high specific pressure state rock cutting of first group of cutting tooth, wedging rock ability is strong, from And make the comprehensive drilling efficiency of drill bit be significantly improved while extending bit life.

(2) rationally select dead slot shape and arrangement form, be remarkably improved " selfreparing " efficiency of drill bit.Especially when Dead slot and first group of cutting mark of mouth nest be when being connected, the reduction of bonding area can make first group of cutting tooth before it is completely worn out, Come off from wing ahead of time, and make follow-up second group cutting tooth inlay form exposure with table, so that drill bit is more quickly completed " certainly Repair ".

(3) arrange dead slot and second group of cutting tooth according to concrete bit operating mode, drill bit under specific environment can be prevented effectively from Various of failure, ensures its drilling efficiency simultaneously.Especially, dead slot and second group are arranged at bit shoulder and crown region Cutting tooth, makes drill bit possess self-reparing capability at shoulder easy to wear and crown region, thus avoids drill bit at hard formation, height Abrasive layer, soft or hard replace stratum and lost efficacy in " annular groove " phenomenon containing in gravel stratum；Similarly, in inner cone region Arrange dead slot and second group of cutting tooth, drill bit can be avoided to lose efficacy because of " from the bottom of one's heart " phenomenon during compound drilling etc..

(4) for having the PDC drill bit of motion cutting unit, owing to this kind of drill bit is generally used for high rigidity, high abrasive and height The bad grounds such as inhomogeneity, pretend the wing for stationary cutting structure and cut tooth and often cut rock and defibrator process occurs because persistently scraping Damage, and impact injury easily occurs, thus lost efficacy prematurely before motion cutting unit (such as dise knife, gear wheel etc.) loses efficacy.Empty The successor list edge cutting structure of groove and second group of cutting tooth formation can make continuing of fixing wing to the repair ability of fixing wing Cutting power is significantly strengthened, and is conducive to the inefficacy avoiding drill bit to cause because fixing wing cutting power loses, makes drill bit The ability to work of upper motion cutting structure is not fully exerted, and improves the service behaviour of drill bit.

Accompanying drawing explanation

Fig. 1 is the structural representation of this utility model embodiment one.

Fig. 2 is the top view of this utility model embodiment one.

Fig. 3 is the radial cutting contour line schematic diagram of this utility model embodiment one.

Fig. 4 is that second group of cutting tooth of this utility model embodiment one arranges schematic diagram.

Fig. 5 is A-A the first structure to partial sectional view of Fig. 4.

Fig. 6 is A-A the second structure to partial sectional view of Fig. 4.

Fig. 7 be conventional " interior edge secondary gear PDC drill bit " when interior edge secondary gear is started working with bottom rock contact process Principle schematic.

Fig. 8 be in this utility model second group of cutting tooth when starting working with the principle schematic of bottom rock contact process.

Fig. 9 is that second group of cutting tooth of this utility model embodiment two arranges schematic diagram.

Figure 10 is that second group of cutting tooth of this utility model embodiment three arranges schematic diagram.

Figure 11 is that the one second group cutting tooth of this utility model embodiment four arranges schematic diagram.

Figure 12 is that the another kind second group cutting tooth of this utility model embodiment four arranges schematic diagram.

Figure 13 is that the one second group cutting tooth of this utility model embodiment five arranges schematic diagram.

Figure 14 is that the another kind second group cutting tooth of this utility model embodiment five arranges schematic diagram.

Figure 15 is the radial direction cloth tooth coverage diagram of this utility model embodiment six.

Figure 15 (a) is that on the first wing of this utility model embodiment six, second group of cutting tooth arranges schematic diagram.

Figure 15 (b) is that on the second wing of this utility model embodiment six, second group of cutting tooth arranges schematic diagram.

Figure 15 (c) is that on the 3rd wing of this utility model embodiment six, second group of cutting tooth arranges schematic diagram.

Figure 15 (d) is that on the 4th wing of this utility model embodiment six, second group of cutting tooth arranges schematic diagram.

Figure 16 is that second group of cutting tooth of this utility model embodiment seven arranges schematic diagram.

Figure 17 is that second group of cutting tooth of this utility model embodiment eight arranges schematic diagram.

Figure 18 is that second group of cutting tooth of this utility model embodiment nine arranges schematic diagram.

Figure 19 is that the one second group cutting tooth of this utility model embodiment ten arranges schematic diagram.

Figure 20 is that the another kind second group cutting tooth of this utility model embodiment ten arranges schematic diagram.

Figure 21 is that second group of cutting tooth of this utility model embodiment 11 arranges schematic diagram.

Figure 22 is that second group of cutting tooth of this utility model embodiment 12 arranges schematic diagram.

Figure 23 is that second group of cutting tooth of this utility model embodiment 13 arranges schematic diagram.

Figure 24 is that second group of cutting tooth of this utility model embodiment 14 arranges schematic diagram.

Figure 25 is that second group of cutting tooth of this utility model embodiment 15 arranges schematic diagram.

Figure 26 is that second group of cutting tooth of this utility model embodiment 16 arranges schematic diagram.

Figure 27 is that the one second group cutting tooth of this utility model embodiment 17 arranges schematic diagram.

Figure 28 is that the another kind second group cutting tooth of this utility model embodiment 17 arranges schematic diagram.

Figure 29 is that the another kind second group cutting tooth of this utility model embodiment 17 arranges schematic diagram.

Figure 30 is that the structure of a kind of dise knife/wing composite drill bit of this utility model embodiment 18 and second group of cutting tooth thereof is shown It is intended to.

Figure 31 is another kind of dise knife/wing composite drill bit and the structure of second group of cutting tooth thereof of this utility model embodiment 18 Schematic diagram.

Figure 32 is gear wheel/wing composite drill bit and the structural representation of second group of cutting tooth thereof of this utility model embodiment 19.

Figure 33 is percussion bit and the structural representation of second group of cutting tooth thereof of this utility model embodiment 20.

Figure 34 is diplocardia drill-following reaming bit and the structural representation of second group of cutting tooth thereof of this utility model embodiment 21 Figure.

Figure 35 is the concentric drill-following reaming bit of this utility model embodiment 22 and second group of cutting tooth arranges schematic diagram.

In figure: 1, bit body；2, screw thread is connected；3, wing；5, dead slot；61, first group of cutting tooth；62, second Group cutting tooth；63, second group of cutting tooth (rear toothrow)；64, interior inserted；11, hydrophthalmia；31, wing leading flank；32、 Wing trailing flank；4, cutting wheel profile；41, inner cone region；42, crown region；43, shoulder regions；44, gauge district Territory.

Detailed description of the invention

Following non-limiting examples is used for this utility model is described.

Embodiment one:

Such as Fig. 1-6, shown in 8, a kind of long-life PDC drill bit, include bit body 1, couple screw thread 2, be arranged at drill bit Several hydrophthalmia 11 and several wings 3 on body 1.Wherein said wing 3 can be for the master as shown in Fig. 2,18,19 Wing 3a, it is also possible to for the secondary wing 3b as shown in Fig. 2,20,21,22.Described operator wing 3a and the master of secondary wing 3b Distinguish and be: wing 3 length extends to region, drill bit heart portion and is operator wing 3a, does not extends to region, drill bit heart portion and is Secondary wing 3b.

In the present embodiment, as it is shown on figure 3, each wing all comprises by wing inner cone region 41, crown region 42, shoulder The wing cloth flank of tooth of region 43 composition and wing leading flank 31 and wing trailing flank 32.Wherein, at the cloth of each wing 3 It is provided with recess on the flank of tooth, in recess, is fixed with first group of cutting tooth 61；And, in the front side of at least wing 3 At least one recessed wing leading flank 31 or through wing leading flank 31 and trailing flank 32 it is provided with on face 31 or trailing flank 32 Dead slot 5, fix in dead slot 5 at least one second group cutting tooth 62.

Additionally, as shown in Figure 25 (being also the A-A of Fig. 3 to partial sectional view), cut the rear side of tooth 62 also at second group At least one second group of standby cutting tooth 63 can be fixed with further.This kind of mode is used to can further improve the cloth tooth of drill bit Density, and improve the service life of drill bit further.

Described dead slot 5 has two schemes along the cross-section structure in bit direction, and the first is that one as shown in Figure 5 is through Dead slot structure, its hollow groove is the groove of through wing body front and back sides.As shown in Figure 8, in lasting drilling process, the One group of cutting tooth will wear and tear, and when wear height reaches the initial proud exposure cutting tooth, the wing body 3 of drill bit is also To wear and tear, until described dead slot 5 is completely exposed to wing external body, final dead slot 5 surface replaces initial cutter completely Second group of cutting tooth 62 fixing in the wing cloth flank of tooth, with dead slot forms new wing cutting structure, that is successor list edge cutting knot Structure.Wing body and the contact surface of bottom rock when through dead slot structure reduces second group of cutting tooth work to a great extent Long-pending, improve second group of cutting tooth creeps into ratio pressure value, can be effectively improved efficiency of breaking rock.The second is as shown in Figure 6 Plant non-penetrating formula structure, belong to a kind of recessed wing body leading flank and be not through to the groove type structure of wing trailing flank.Groove The structural strength of wing body itself is affected less by formula dead slot structure, can be prevented effectively from and cause the breaking wing etc. because of the introducing of dead slot The generation of structural strength failure phenomenon.

The end face structure of described dead slot 5 also has kinds of schemes, as shown in Figure 22, Figure 23.In Figure 22, the geometry of dead slot 51 Be shaped as key-way shape structure, carry out concrete structure arrange time, the straight line of this kind of form dead slot can (approximate) parallel or It is perpendicular to the cutting wheel profile of drill bit, it is possible to be arranged in parallel with drill bit geometric center lines；In Figure 22, dead slot 52 geometry For sector, when carrying out concrete structure and arranging, the camber line limit of the larger radius of curvature of this kind of form dead slot and the cutting profile of drill bit Line is parallel or less parallel；In Figure 22, the geometry of dead slot 53 is crescent.When carrying out concrete structure and arranging, Parallel or less parallel with the cutting wheel profile 4 of drill bit in the camber line limit of this kind of form dead slot.

Use the dead slot 5 of above-mentioned different structure, there is respective advantage, be specifically expressed as follows:

(1) the dead slot structure of groove type can adapt with the inner cone region of bit cutting contour line and shoulder regions, it is simple to more Good cloth is setting in wing inner cone region and second group of cutting tooth of shoulder regions.

(2) fan-shaped dead slot structure can adapt with the crown region of bit cutting line, it is simple to preferably cloth is preced with setting in wing Second group of cutting tooth in region, top.

(3) crescent dead slot structure can make drill bit begin to wear out second group of cutting tooth contact bottom rock also from wing body Start brokenly during rock creeps into, gradually transition.Namely the pressure of the drill (than pressure) on second group of cutting tooth gradually applies up, Effectively prevent after wearing and tearing because of cutter dead slot bottom blades body as key-way shape dead slot structure or circular arc dead slot structure, bore It is suddenly applied in the pressure short time on second group of cutting tooth, causes impact to collapse the generation of the cutting tooth Problem of Failure such as damage, delamination.

(4) vertical dead slot structure can effectively reduce radial structure space on occupied wing body, for improving drill bit or single Second group of cutting tooth cutter set density on wing creates advantage.

By rationally arranging dead slot 5, and reasonable Arrangement second group cutting tooth 62, drill bit radially cloth as of fig. 24 can be formed Tooth covered structure.The present embodiment is except having the radial direction cloth tooth being made up of main cutting tooth 61 covering that conventional PDC drill bit is had Outside structure, also there is the radial direction all standing cloth toothing being made up of second group of cutting tooth 62.

The beneficial effect of such scheme mainly has two aspects.

First, the organization plan that this utility model is proposed, on the premise of being not take up main cutting tooth cloth tooth space, it is possible to significantly Increase the cutter set density of drill bit, and then be effectively improved the service life of drill bit.

Second, as shown in Figure 8.Because this utility model introduces dead slot structure, and in dead slot, it is fixed with second group of cutting tooth, When second group of cutting tooth contact rock wedging stratum break rock creep into time, the most direct with second group of cutting adjacent wing body of tooth Contact shaft bottom or only small part contact shaft bottom, add second group of cutting tooth creeps into ratio pressure value, makes second group of cutting tooth energy The stratum wedging ability that enough acquisitions are same or like with main cutting tooth, with high specific pressure state rock cutting, thus improves drill bit Comprehensive drilling efficiency, and make drill bit possess self-reparing capability.

Embodiment two:

As it is shown in figure 9, the present embodiment is essentially identical with embodiment one.Its difference is: be provided with a dead slot 5 on wing 3, More than one second group of cutting tooth it is fixed with in described dead slot 5.When only having single continuous dead slot 5 feelings on certain wing 3 Under condition, it is beneficial to apply this cloth tooth pattern.In the present embodiment, by being fixed with many second group cutting in a dead slot Tooth can increase the cutter set density of second group of cutting tooth further, improves the service life of PDC drill bit.

Embodiment three:

As shown in Figure 10, the present embodiment is essentially identical with embodiment one.Its difference is: be provided with two or two on wing 3 Individual above dead slot 5, at least two dead slots 5 are arranged on different drill bit radial zones, and be provided with in each dead slot 5 to Few one second group cutting tooth 62.By arranging two or more mutual discontinuous dead slot structures on wing body, can To avoid the dead slot because offering on wing excessive or the long wing structural strength caused excessively reduces, and wing is caused to break Dangerous.

Embodiment four:

As shown in Figure 11, Figure 12, the present embodiment is essentially identical with embodiment one.Wherein, Figure 11 wing radial direction 1/3rd Multiple discontinuous dead slot is set outside region, Figure 12 arranges single continuous dead slot outside wing radially 1/3rd regions.Its difference It is: on wing 3, be provided with one or more dead slot 5, and all dead slots 5 are all limited to drill bit three/Radius With exterior domain, in each dead slot 5, it is provided with at least one second group cutting tooth 62.Owing to PDC drill bit is at crown region cloth tooth Shi Youqi particularity, the cutting tooth being i.e. positioned at drill bit crown region is in the region of stress concentration of drill bit entirety cutting structure, holds It is subject to higher chip-load；And the cutting tooth in this region is positioned at the least significant end of drill bit, to the change of formation lithology (such as soft or hard Replace stratum, containing gravel stratum etc.) more sensitive, cutting tooth is susceptible to collapse the extraordinary failure phenomenons such as damage.In the program, Second group of cutting tooth is arranged in the region beyond drill bit radial direction 1/3rd, when the main cutting tooth in PDC drill bit certain region outside When abrasion occurring with body and exposes dead slot, second group of cutting tooth in this region just as successor list edge cutting tooth, replaces this district The main cutting tooth in territory works on high specific pressure state, thus while ensure that drill bit wedging stratum ability, it is achieved that bore Head is repaired in crown and with the autonomous of exterior domain, and then extends bit life.

Embodiment five:

As shown in Figure 13, Figure 14, the present embodiment is essentially identical with embodiment one.Wherein, in Figure 13 wing radially three/ Multiple discontinuous dead slot is set in two regions, Figure 14 arranges single continuous dead slot in wing radially 2/3rds regions.Its district It is not: on wing 3, be provided with one or more dead slot 5, and all dead slots 5 are all limited to the Xin Bu district of wing 3 Territory (drill bit 2/3rds radius is with inner region), is provided with at least one second group cutting tooth 62 in each dead slot 5.In this reality Execute in example, in different radial zones, be provided with two or more discontinuous dead slot, can avoid because of on wing The dead slot offered is excessive or long, and the wing structural strength caused excessively reduces, and causes the danger that wing breaks.The opposing party Face, under some special operation condition, during combined drilling, owing to inner cone and the heart portion region number of teeth of PDC drill bit are less, Working condition is complicated, and this region cutting tooth usually can occur Fast Wearing.In the program, second group of cutting tooth is arranged in brill Region within head radial direction 2/3rds, as the follow-up cutting structure in this region, it is possible at first group of cutting odontotripsis totally After, continue to be equal to or work on close to first group of high specific pressure state cutting tooth, it is achieved that drill bit is at inner cone and the heart The self-reparing capability in region, portion, thus extend PDC drill bit service life under the special operation conditions such as combined drilling.

Embodiment six:

As shown in Figure 15 and Figure 15 (a) to Figure 15 (d), the present embodiment is essentially identical with embodiment one.Its difference is: Being provided with two or more dead slot 5 on wing 3, dead slot 5 is arranged in the whole of drill bit or nearly all of radial zone, It is provided with at least one second group cutting tooth 62 in each dead slot 5, and forms complete or the most complete shaft bottom covering.This is real Execute in example, in whole or nearly all of drill bit radial zone, be all disposed with second group of cutting tooth so that by second group of cutting The successor list edge cutting structure that tooth is constituted is after main cutting tooth and blade surface wear and tear totally, it is possible to comprehensive replacement is cut by main Cut the initial table edge cutting structure that tooth is constituted so that drill bit all possesses self-reparing capability in overlay area, whole shaft bottom, thus greatly Width extends the service life of PDC drill bit.

Embodiment seven:

As shown in figure 16, the present embodiment is essentially identical with embodiment one.Its difference is: be provided with two or two on wing 3 Individual above dead slot 5, is fixed with at least one second group cutting tooth 62 in each dead slot 5, dead slot 5 axially presses ladder at drill bit Secondary layout, echelon number is more than or equal to 2, and second group of cutting tooth of each echelon is arranged according to same contour line, and each cutting wheel Exterior feature the most mutually staggers along drill bit.In this embodiment, first group of cutting tooth forms the first cutting profile on wing；Second group Cutting tooth is arranged on wing by echelon, the cutting profile of second group of cutting tooth each self-forming independence of each echelon, the most permissible Previous echelon cutting odontotripsis totally after as successor list inlay cutting structure fractured rock so that drill bit is at not same order Section is provided with self-reparing capability, extends the life-span of drill bit further.

Embodiment eight:

As shown in figure 17, the present embodiment is essentially identical with embodiment one.Its difference is: be provided with two or two on wing 3 Individual above dead slot 5, is fixed with at least one second group cutting tooth 62 in each dead slot 5, dead slot 5 is intensive on wing 3 Arrange, the wing body between each dead slot 5 there also is provided interior inserted by 64.In this embodiment, first group of cutting tooth is at wing Profile is cut in upper formation first；Second group of cutting tooth is fixed on wing by the mode of intensive layout, considerably increases single cutter The cutter set density of the wing, on the other hand, due to second group of cutting tooth at drill bit axially, radially mutually stagger, and is formed without clearly Cutting profile, each dead slot exposes second group of cutting tooth fixing in it after closing on the abrasion of wing body in succession so that With on wing and adjacent blades second group cutting tooth at drill bit axially, the most overlapping, exposure in succession, make drill bit While high specific pressure state rock cutting, it is possible to the most independently repair eroded area, thus significantly extend brill The head life-span.

Embodiment nine:

As shown in figure 18, the present embodiment is essentially identical with embodiment one.Its difference is: at least one is fixed with first group and cuts The recess cutting tooth 61 is connected with described dead slot 5.In this embodiment, the socket of first group of cutting tooth is connected with dead slot reduction The real contact area (solder side area) of first group of cutting tooth and wing body, therefore, when first group of cutting odontotripsis amount surpasses When crossing its proud exposure, wing body will come in contact and wear and tear with rock, along with the increase of wear extent, cutting tooth solder side Area is gradually reduced, and cutting tooth consolidation strength is gradually lowered, and socket is connected with dead slot and first group of cutting tooth will be made at all mills Just come off from wing body before having damaged, thus the exposure of second group of cutting tooth in realizing dead slot quickly, and then it is real to improve drill bit The efficiency of existing " selfreparing ".

Embodiment ten:

As shown in Figure 19, Figure 20, the present embodiment is essentially identical with embodiment one.Wherein, in Figure 19, wing 3 is the operator wing, In Figure 20, wing 3 is secondary wing.Its difference is: be provided with dead slot 5 on operator wing 3a or secondary wing 3b medial surface, should Dead slot is the open slot do not closed, and is fixed with second group of cutting tooth 62 in open slot.

Embodiment 11:

As shown in figure 21, the present embodiment is essentially identical with embodiment one.Wherein, wing 3 is secondary wing.Its difference is: Being provided with dead slot 5 on operator wing 3a or secondary wing 3b gage surface, this dead slot is the open slot do not closed, fixing in open slot There is second group of cutting tooth 62.

Embodiment 12:

As shown in figure 22, the present embodiment is essentially identical with embodiment one.Wherein, wing 3 is secondary wing.Its difference is: Being provided with dead slot 5 on operator wing 3a or secondary wing 3b lateral surface, this dead slot is the inclined-plane open slot do not closed, in open slot It is fixed with second group of cutting tooth 62.

Embodiment 13:

As shown in figure 23, the present embodiment is essentially identical with embodiment one.Its difference is: be provided with two or two on wing 3 Individual above dead slot 5, described dead slot 5 can be the one or in described key-way shape, sector, crescent and opening shape dead slot Plant above independent assortment, in each dead slot 5, be fixed with second group of cutting tooth 62.

Embodiment 14:

As shown in figure 24, the present embodiment is essentially identical with embodiment one.Its difference is: be provided with at least one on wing 3 Dead slot 5, described dead slot 5 can be circular dead slot, is fixed with second group of cutting tooth 62 in each dead slot 5.

Embodiment 15:

As shown in figure 25, the present embodiment is essentially identical with embodiment one.Its difference is, cuts for second group that is arranged in dead slot 5 Cut tooth 62 for point knuckle-tooth.

Embodiment 16:

As shown in figure 26, the present embodiment is essentially identical with embodiment one.Its difference is, drill bit circumferentially fixed two in dead slot 5 Second group of more than row or two rows cutting tooth 62.Wherein front two rows second group cutting tooth can be the most equal, it is also possible to after being The most front toothrow of toothrow.If ranked second group cutting tooth before contour with rear toothrow, then front two rows cutting tooth will be at main cutting tooth And after blade surface abrasion totally, cut rock simultaneously as inserted the scraping of successor list simultaneously；Ranked second group cutting tooth after if to be less than Front toothrow, then heel row cutting tooth is as the standby tooth of front toothrow, when second group of front-seat odontotripsis is to after to a certain degree, heel row Tooth will subsequently enter rock break-off process.Both cutting tooth arrangements are all conducive to strengthening second group of cutting tooth to bit cutting energy The repair of power, extends bit life further.

Embodiment 17:

As Figure 27, Figure 28 and Figure 29 show, the present embodiment is identical with embodiment pentadecyl basis.Wherein, in Figure 26 front-seat the Two groups cutting teeth be common PDC composite teeth, after ranked second group cutting tooth be taper crown composite teeth, in Figure 27 before ranked second group Cutting tooth be taper crown composite teeth, after ranked second group cutting tooth be common PDC composite teeth, in Figure 28 before ranked second group cutting Tooth is common PDC composite teeth, after ranked second group cutting tooth be spherical crown composite teeth.Its difference is, is arranged in dead slot 5 Second group cutting tooth 62 can be taper tooth top or the diamond composite teeth of sphere tooth top, it is also possible to be triangle or other shapes The TSP tooth of shape.When wherein conical tooth is as second group of cutting tooth, can be disposed at after two rows cut in tooth Row, breaks rock with front toothrow, as shown in figure 27 simultaneously；Or it is arranged in the front row that two rows cut in tooth, as precrushing tooth, as Shown in Figure 28,；When sphere tooth is as second group of cutting tooth, it is arranged in the heel row that two rows cut in tooth, as buffering tooth, as Shown in Figure 29.

Embodiment 18:

As shown in Figure 30, Figure 31, the present embodiment is essentially identical with embodiment one.Wherein, dise knife and cutting tooth thereof are mountable to Extend from the bit leg of drill body, and be rotationally connected, as shown in figure 30 with bit leg formation；Wing can also be directly mounted at Body, and formation is rotationally connected, as shown in figure 31 therewith.Its difference is: described drill bit is the PDC being provided with dise knife Composite drill bit.

As it can be seen, this composite drill bit comprises the wing as fixing cutting unit and the dise knife as motion cutting unit.Boring During entering, dise knife unit rotates and the effect of rock counter-force issues to be conigenous and turns at drill bit, makes dise knife cutting tooth alternately, in turn Scrape and cut rock, jointly act on stationary cutting structure, the webbed BHP of shape, not only effectively prevent dise knife tooth Thermal wear, also greatly improves the efficiency of breaking rock of drill bit.On the other hand, as the wing of fixing cutting unit, not only to hold Continuous rock cutting, still suffers from the thermal wear effect that continuous frictional produces, and therefore fixes wing cutting tooth inefficacy speed the fastest Tooth is cut in dise knife.In the program, dead slot is arranged on fixing wing, and in dead slot, fixes a number of cutting tooth, Form the successor list edge cutting structure of wing so that wing has possessed self-reparing capability, it is to avoid fixing cutting tooth compares dise knife The premature failure of cutting tooth, thus extend the service life of composite drill bit.

Embodiment 19:

As shown in figure 32, in figure, drill bit is gear wheel/wing composite drill bit.The present embodiment is identical with embodiment heptadecyl basis, its Difference is: described drill bit is the PDC composite drill bit on it with gear wheel.

Embodiment 20:

As shown in figure 33, in figure, drill bit is percussion bit.The present embodiment is identical with embodiment heptadecyl basis, and its difference is: Described drill bit is percussion bit.

Embodiment 21:

As shown in figure 34, the present embodiment is essentially identical with embodiment one, and its difference is: described drill bit is fixed for a kind of diplocardia Formula enlarging while drilling PDC drill bit.

As shown in figure 34, for the cutting structure of a kind of diplocardia fixed enlarging while drilling PDC drill bit mainly by " neck eye section " and " expansion Hole section " formed, due to the circumferential asymmetry of its reaming section wing structure, the biggest horizontal out-of-balance force can be produced, enter And make drill bit produce eccentric rotational motion in shaft bottom.So frequently result in drill bit " eccentric wear ", make that shares on each cutting tooth to cut Cut loadmeter and reveal highly non-uniform property, thus more conventional PDC drill bit is easier to occur that " annular groove ", " from the bottom of one's heart " etc. were lost efficacy The generation of phenomenon.Therefore, the present embodiment is applied on diplocardia fixed enlarging while drilling PDC drill bit, can be effectively improved drill bit Cutter set density and follow-up cutting tooth work time creep into ratio pressure value, allow enlarging while drilling PDC drill bit possess self-reparing capability, both Extend the service life of drill bit of knowing clearly, improve the comprehensive drilling efficiency of drill bit the most well.

Specific embodiments includes, is fixed with first group of cutting tooth on diplocardia fixed enlarging while drilling PDC drill bit neck eye section wing It is provided with dead slot 5 on 611, and neck eye section wing body, in this dead slot, fixes second group of cutting tooth 621 constitute follow-up cutting knot Structure；Or on diplocardia fixed enlarging while drilling PDC drill bit reaming section wing, it is fixed with first group of cutting tooth 612, and reaming section cutter It is provided with dead slot 5 in wing body, in this dead slot, fixes second group of cutting tooth 622 constitute follow-up cutting structure；Or neck eye section and Reaming section arranges dead slot 5 simultaneously, and fixes second group of cutting tooth 621 and 622 in neck eye section and reaming section dead slot simultaneously, Form follow-up cutting structure respectively.Fix as it can be seen, be respectively and fixedly provided with second group of diplocardia cutting tooth for neck eye section and reaming section Formula reaming bit.

Embodiment 22:

As shown in figure 35, the present embodiment is identical with embodiment icosyl basis, and its difference is: described drill bit is for a kind of the most solid Fixed pattern enlarging while drilling PDC drill bit.

The specific embodiments of the present embodiment and embodiment eicosanoid seemingly, including: lead at concentric fixed enlarging while drilling PDC drill bit It is fixed with first group of cutting tooth 611 on eye section wing, and is provided with dead slot 5 on neck eye section wing body, in this dead slot, fix the Two groups of cutting teeth 621 constitute follow-up cutting structure；Or it is fixing on concentric fixed enlarging while drilling PDC drill bit reaming section wing Have on first group of cutting tooth 612, and reaming section wing body and be provided with dead slot 5, in this dead slot, fix second group of cutting tooth 622 Constitute follow-up cutting structure；Or dead slot 5 is set simultaneously in neck eye section and reaming section, and same in neck eye section and reaming section dead slot Time fix second group cutting tooth 621 and 622, form follow-up cutting structure respectively.Shown in figure, for neck eye section and reaming Duan Jun It is fixed with the concentric fixed reaming bit of second group of cutting tooth.

The each embodiment of aforementioned this utility model can be this utility model can use also with independent assortment to form multiple embodiments Claimed embodiment.Such as, embodiment 1 and the combination of other embodiments, between embodiment 2,3,9,10,11 Independent assortment, etc., do not do at this exhaustive, skilled person will appreciate that numerous combination.

The foregoing is only preferred embodiment of the present utility model, not in order to limit this utility model, all at this utility model Spirit and principle within any amendment, equivalent and the improvement etc. made, should be included in protection model of the present utility model Within enclosing.

Claims (13)

1. there is a long-life drill bit for self-reparing capability, including bit body and at least one wing, wing is provided with some first Group cutting tooth, the wing cloth flank of tooth and/or wing gage surface arrange recess in order to fix first group of cutting tooth, it is characterised in that: at least It is provided with at least one dead slot and at least one second group cutting tooth on one wing, recess is set in dead slot in order to fix second group Cutting tooth, and second group of cutting tooth at least part of cutting edge exposure is in dead slot inner surface.

The long-life drill bit with self-reparing capability the most according to claim 1, it is characterised in that: described dead slot is through wing The groove of the through structure of front and back sides；Or the groove that described dead slot is not communicating structure.

The long-life drill bit with self-reparing capability the most according to claim 1, it is characterised in that: arrange at least one wing Having two or more dead slot, at least two dead slots are arranged on different drill bit radial zones, are fixed in each dead slot Few one second group cutting tooth.

The long-life drill bit with self-reparing capability the most according to claim 1, it is characterised in that: at least one described dead slot Along the circumferentially fixed second group of cutting tooth having more than front two rows or two rows of drill bit, and the quantity that often ranked second group tooth is at least one.

The long-life drill bit with self-reparing capability the most according to claim 1, it is characterised in that: described second group of cutting tooth cloth Put the radial zone beyond drill bit three/Radius.

The long-life drill bit with self-reparing capability the most according to claim 1, it is characterised in that: described second group of cutting tooth cloth Put the radial zone within drill bit 2/3rds radius.

The long-life drill bit with self-reparing capability the most according to claim 1, it is characterised in that: described second group of cutting tooth cloth Put the whole of drill bit or close to whole radial zones, form complete or the most complete shaft bottom and radially cover.

The long-life drill bit with self-reparing capability the most according to claim 1, it is characterised in that: at least one fixes first group The recess of cutting tooth is connected with described dead slot.

The long-life drill bit with self-reparing capability the most according to claim 1, it is characterised in that: medial surface and the guarantor of wing On diametric plane, set dead slot is the open slot do not closed, and is fixed with at least one second group cutting tooth in open slot.

The long-life drill bit with self-reparing capability the most according to claim 1, it is characterised in that: described first group of cutting tooth Forming the first cutting profile, described second group of cutting tooth forms the second cutting profile or even more cutting profile, and each cutting profile is indulged To being staggeredly arranged.

The 11. long-life drill bits with self-reparing capability according to claim 1, it is characterised in that: described dead slot is at bit wing Intensive layout on the wing, and the type of each second group of cutting tooth is multiple.

The 12. long-life drill bits with self-reparing capability according to claim 1, it is characterised in that: described second group of cutting tooth For circular or ellipse, point circle the PDC tooth of cutting edge profile, TSP tooth, and the diamond of sharp cone distal bizet Composite teeth.

The 13. long-life drill bits with self-reparing capability according to claim 1, it is characterised in that: also including on drill bit can phase Bit body is rotated or the motion cutting unit of translation.