CN106089086B - A kind of bad ground long-life re-drill bit - Google Patents

Abstract

The invention discloses a kind of bad ground long-life re-drill bits, including the drill body being made of neck eye body and reaming hole body, extend from multiple wings of neck eye body and reaming hole body, hydrophthalmia or nozzle are provided in runner between wing, several first group of cutting tooth is provided on wing, recess is arranged to fix first group of cutting tooth in the wing cloth flank of tooth, at least there are two neck eye section and/or the existing not overlapping region of body profiles line of two reaming hole section wings, also there is coincidence point or overlapping region.This structure feature can make re-drill bit work with asynchronous cutting way, it not only can increase the abrasion length of wing, extend bit life, and drill bit can be made to creep into state all in high specific pressure in entire drilling process, the ability for enhancing drill bit intrusion rock, so that drill bit be made all to be improved in the drilling speed of bad ground and service life.

Description

A kind of bad ground long-life re-drill bit

Technical field

The invention belongs to oil-gas drilling engineering, mine engineering, building foundation engineering constructions, geological drilling, tunnel The technical equipment such as engineering, the hydrology, shield and no-dig technique field, more particularly to a kind of Drilling bore bit.

Background technique

As the secondary development of casing window sidetracking and old well is more and more, hole reaming tool is widely applied.Drilling well Usually there are two types of modes for reaming hole construction in engineering: first, first drilling out neck eyelet (i.e. pilot hole) with conventional bit, then using expansion instead Drill or tool carry out reaming construction, namely bore the construction of neck eye and carry out respectively with reaming hole construction；Secondly, with " with bore expand The mode of eye ", the reaming hole in drilling are disposable to complete to bore, expand construction.Reaming while drilling drill bit (also referred to as reaming while drilling tool) is logical Chang Youling eye portion (part for boring pilot hole) and reaming hole part are constituted, and neck eye portion is also referred to as pilot bit, and reaming hole part is also referred to as Re-drill bit or hole reaming tool.It leads eye portion and reaming hole part that can use integral type body construction, can also be used split type Body structure.The fixed and telescopic two major classes of reaming while drilling tool point, the difference of the two essentially consists in the structure of reaming hole part, preceding The reaming hole part of person is the stationary structure (or fixed toothing) of without motion part, the reaming hole cutting structure or reamer wing of the latter It can stretch.Since fixed reaming while drilling drill bit structure is simple, functional reliability is high, so using more extensive.

There are mainly of two types for fixed reaming while drilling drill bit: staged and diplocardia formula.Staged re-drill bit is actually A kind of total cost management drill bit for having piece-wise step on contour line is exactly cut, center portion leads the cutting of eye portion and external reaming hole part Tooth is located at different height and positions, makes to generate step on shaft bottom cutting contour line.Because the rock at step is more easily broken, So can be improved efficiency of breaking rock using this drill bit when borehole size is larger, while being also beneficial to promote wellbore quality.

Diplocardia reaming while drilling drill bit is also known as " diplocardia re-drill bit ", " Double Circular Bit ", " diplocardia hole reaming tool " etc., is one One of kind common reaming while drilling tool or re-drill bit are frequently utilized for the reaming while drilling under the conditions of old well depth brill, sidetracking etc. and apply Work, performance characteristics can be drilled out than the hole bigger by diameter (such as casing inner diameter).In reaming while drilling tool, PDC expands The advantages that eye drill bit is safe and reliable with its, rate of penetration is high, bit pressure and torque are smaller, becomes the main shape of reaming while drilling drill bit Formula.However, due in use by drillstring vibrations and stratum it is soft or hard staggeredly etc. factors influenced, PDC re-drill bit Cutting tooth, especially its cutting tooth for leading eye section, caused by being generally easy to because of shock loading or the unequal factor of depth of tooth penetration It is early to destroy, it is not grown so as to cause drilling life of bit, increases time and the economic cost of drilling process.

The reaming hole part (reaming hole body) of fixed reaming while drilling drill bit can be the single-stage reaming hole knot of only level-one counter bore diameter Structure can also be the multistage reaming hole structure at least 2 grades counter bore diameters.

As conventional PDC drill bit, its neck eye section of existing PDC re-drill bit and reaming hole section usually all have several knives The wing, along drill bit being arranged radially multiple cutting elements on wing, (to PDC drill bit, cutting element is mainly that polycrystalline diamond is multiple Close piece, abbreviation composite sheet or PDC tooth).In existing PDC drill bit technology, the wing in fixed cutter drill bits is according to same Step cutting principle is designed, i.e., on each wing the cutting tooth of different radial positions simultaneously or it is synchronous (or substantially simultaneously, substantially It is synchronous) enter working condition, start to cut bottom rock, and start simultaneously at and wear.Green bit is under ideal working condition When (the stabilization drilling state that bit central is overlapped with wellbore center) drilling rock, simultaneously participates in and scrape all cutting tooths for cutting rock It is main cutting tooth, main cutting tooth is the primary cutting element of drill bit fractured rock, it is typically provided at the front side of each wing, with Conducive to reaching better cooling and cleaning effect.Other than cutting tooth, standby can be also set on drill bit as needed and cut Tooth (i.e. when main cutting odontotripsis to a certain extent after the cutting tooth just devoted oneself to work, such as rear toothrow) and assisted machining structure It (refers mainly to help the structure of main cutting tooth broken rock, such as bores tooth, or the buffer structure of protection cutting tooth effect, such as buffering section or slow Rush tooth etc.).

In PDC drill bit design process, it will usually arbitrarily determine a plane by drill bit central axis as cloth tooth Axial plane (is also referred to simply as axial plane), and the radial and axial position of each cutting tooth can obtain accurate table on the axial plane on drill bit It reaches.When drill bit rotates under conditions of axial position is constant around own axes, the land contour line of cutting tooth intersects with axial plane Intersection is formed, which is the axial plane contour line of cutting tooth, then by main cutting teeth all on drill bit (or on several specified wings All main cutting teeth) axial plane contour line collect in the axial plane, be formed axial plane cloth tooth figure (or several specified knives of drill bit The axial plane cloth tooth figure of the wing).Because axial plane cloth tooth figure can accurately reflect cutting tooth on drill bit to the radial coverage condition of bottom rock, Therefore it is called shaft bottom drape tooth figure, abbreviation drape tooth figure or shaft bottom coverage diagram.

In the shaft bottom coverage diagram of drill bit, make an external envelope song tangent with the axial plane contour line of all main cutting teeth Line, as the cutting contour line (namely crown profile line of drill bit) of drill bit, as shown in Fig. 2, for re-drill bit in the prior art Shaft bottom coverage diagram, wherein horizontal direction R be drill bit radial coordinate, vertical direction Z be drill bit axial coordinate, the song of label 11 Line is the cutting contour line of drill bit in the prior art, and region A is neck eye section, and region B is reaming hole section.

In the shaft bottom coverage diagram of drill bit, if only specifying the cutting tooth on wing to show some, and by other knives Cutting tooth on the wing conceals, and is formed the axial plane cloth tooth figure of the wing.In the axial plane cloth tooth figure of wing, make one and each master The tangent external envelope curve of the axial plane contour line of cutting tooth, the envelope are then referred to as the cutting contour line of the wing.Wing Cutting contour line, which is reflected, (can be completely covered the shaft bottom radial portion where the wing when the distribution of main cutting tooth is close enough on wing Domain) when, the basic or desired profile shape feature in the shaft bottom which independently cuts.

If drill bit rotates under conditions of axial position is constant around own axes, for a certain wing body, front side The intersection of face and its cloth flank of tooth will form one using drill bit central axis as the surface of revolution of axis as the rotation of drill bit is scanned, The intersection of the surface of revolution and axial plane is the body profiles line of wing, as shown in Fig. 2, the wherein curve marked as 32, as The body profiles line of wing.Under normal conditions, since the proud exposure for the main cutting tooth being arranged on the wing cloth flank of tooth is identical Or similar (closing on except the region of gage land), so the cutting contour line of wing and the shape of its body profiles line are in substantially Parastate only may have notable difference in the region for closing on rule diameter.Therefore, existing based on the needs for realizing synchronous cutting principle The body profiles line of each wing of drill bit mutually coincides or essentially coincides in technology.In other words, theoretically each knife of drill bit On surface of revolution of the body profiles line of the wing same using drill bit central axis as axis, thus they are all identical one One section on curve or same curve.This feature can be referred to as the consistency or conllinear of each wing body profiles line of drill bit Property.Obviously, this consistency or synteny are not only present in the body profiles line of each wing, and to the cutting profile of each wing Line is also to set up.Exactly this structure feature enables the main cutting tooth being fixedly arranged on each wing of drill bit simultaneously or synchronous Bottom rock is cut, and then forms pit shaft.

Utility model patent " with second level toothing polycrystalline diamond compact bit " (Patent No.: ) and the utility model patent " composite polycrystal-diamond with the longitudinal standby cutting structure of stand alone type ZL200620033337.3 In drill bit " (Patent No.: ZL200720082270.7), a kind of PDC brill with standby (second level) toothing is disclosed Head, common feature are in the bit body that standby tooth is consolidated under main cutting tooth, i.e. standby tooth is inside relative to bit body Arrangement is upwardly formed multiple step structure to indulge in drill bit.The purpose that longitudinal standby tooth is arranged in two patents, which is to increase, bores The longitudinal direction of head Adamas cutting tooth can wear length, extend drilling life of bit.But longitudinal standby tooth in above-mentioned two scheme is equal To be interior inserted, and its main cutting tooth press synchronous cutting principle work, as it is inserted in assisted machining structure must be in main cutting Odontotripsis totally and ontology have part wears after just start to work, but inside inserted rock cutting while, wing ontology is It is contacted with stratum occurrence of large-area, the ratio pressure that standby cutting tooth acts on rock is reduced significantly, to make the drilling of drill bit Efficiency is very limited.

Similar with conventional PDC drill bit, the existing PDC re-drill bit with synchronous cutting principle is boring ground in face of complicated difficult When layer (high rigidity, high abrasive or even containing the heterogeneities stratum such as gravel layer, interlayer), not only drilling efficiency is restricted, and is made It is also undesirable with the service life.The main reason is that: first, in order to guarantee that drill bit can have stronger wedging in hard formation drilling Or the ability of intrusion rock surface, it is necessary to use size (diameter) lesser cutting tooth, however the exposure of minor diameter cutting tooth It is highly small, can wear height be substantially less than major diameter cutting tooth, but at this time the rate of wear of cutting tooth faster, therefore just formed Insoluble contradiction in one bad ground drill bit design: according to major diameter cutting tooth, cutting tooth is difficult to invade rock (especially occurring after wearing to a certain degree), drill bit efficiency of breaking rock is low；According to minor diameter cutting tooth, the work longevity of cutting tooth Life is again inadequate.Second, cutting tooth is frequently subjected to stronger shock loading when drill bit is crept into hard formation, heterogeneity stratum, easily Occur the falling off, be broken of a small amount of or even individual cutting tooths, fragmentation, diamond layer the rapid failures phenomenon such as burst apart, this phenomenon Once occurring, close region cutting tooth will be caused because of chain failure caused by increased workload, then generate ring cutting phenomenon, I.e. the exposure part of cutting tooth of the drill bit in the radial zone is ground off by whole or big portion, and in turn in each wing ontology of drill bit On grind annular groove.Ring cutting phenomenon is once occur, and the ontology of each wing directly forms face contact with rock on drill bit, even if knife Cutting tooth on the wing has not yet all been ground, but due to reduction more serious than pressure, so the efficiency of breaking rock of drill bit can be remarkably decreased.Institute To be generally considered as drill bit and lose or approached forfeiture cutting power, cannot not only reenter well makes after grinding annular groove on drill bit With even reparation (cutting tooth that replacement or renovation have worn away) is all difficult to carry out when serious.

To solve the above-mentioned problems, the efficiency of breaking rock and working life that re-drill bit creep into bad ground are improved, this is special Benefit proposes a kind of long-life re-drill bit and its design method suitable for bad ground.

Summary of the invention

It is an object of the invention to: a kind of bad ground long-life re-drill bit and its design method can be obviously improved brill Working performance of the head under the formation conditions such as complicated applications condition especially high rigidity, high abrasive, high inhomogeneity.

The object of the invention is realized by following technical proposals:

A kind of bad ground long-life re-drill bit is extended from including the drill body being made of neck eye body and reaming hole body (wing for extending from neck eye body leads eye section wing to the multiple neck eye section wings and reaming hole section wing of neck eye body and reaming hole body, prolongs It stretches from reaming hole body wing i.e. reaming hole section wing.Reaming hole body can for only level-one counter bore diameter single-stage reaming hole body, can also for The multistage reaming hole body of at least 2 grades counter bore diameters.Neck eye body and reaming hole body can be the split type structure as made of being threadedly coupled, It is also possible to integral structure).It is provided with hydrophthalmia or nozzle in runner between wing, several first group is provided on wing Recess is arranged to fix first group of cutting tooth in cutting tooth, the wing cloth flank of tooth, at least one leads eye section and/or a reaming hole section The body profiles line of wing is at least body profiles line of another neck eye section and/or another reaming hole section wing common There is at least one not overlapping region (or being different wide region) and at least one coincidence point or overlapping region in coverage area (or for wide region).That is, the body profiles line of at least one neck eye section wing and at least another neck eye section wing Body profiles line have at least one not overlapping region (or for different wide region) collectively covering in range, and at least one A coincidence point or overlapping region (or for wide region), alternatively, the body profiles line of at least one reaming hole section wing with extremely The body profiles line of another few reaming hole section wing has at least one overlapping region (or is not collectively covering in range Different exterior feature region) and at least one coincidence point or overlapping region (or for wide region), alternatively, at least one neck eye section With the body profiles line and the ontology wheel of at least another neck eye section and another reaming hole section wing of a reaming hole section wing Profile has at least one not overlapping region (or for different wide region) and at least one coincidence point collectively covering in range Or overlapping region (or for wide region) --- because neck eye section is different with the spatial position of reaming hole section wing, so for The comparison of so-called " be overlapped/not being overlapped " is compared between neck eye section wing and neck eye section wing, reaming hole section wing and reaming hole section knife It is compared between the wing.Similarly, in this patent, it is related to the concepts such as " be overlapped/not being overlapped ", " mutually staggering ", " similar or identical " It also indicates to compare between neck eye section wing and neck eye section wing elsewhere, it is right between reaming hole section wing and reaming hole section wing Than hereafter repeating no more.

For drill body according to the present invention, neck eye body, reaming hole body, wing, the wing cloth flank of tooth, neck eye section wing, Reaming hole section wing, hydrophthalmia, nozzle, wing body profiles line or even first group of cutting tooth are concept well known in the art, herein It does not repeat them here, can refer to as shown in Figure 13, Figure 14, Figure 20, Figure 22 and Figure 23, be the structural representation of re-drill bit of the present invention Figure, wherein 1 be drill body, 1a is that drill bit leads eye body, 1b to be drill bit reaming hole body, 2 be connection screw thread, 3 be wing, 33 be knife The wing cloth flank of tooth, 41 be first group of cutting tooth, 6 be hydrophthalmia；7 be nozzle；As shown in Figure 10, Figure 15, respectively to lead eye section in the present invention Wing body profiles line schematic diagram, wherein 32 be neck eye section wing body profiles line.

In existing technology, on drill bit the body profiles line of all wings same using drill bit central axis as axis On the surface of revolution of line, thus they belong to an identical curve, or are respectively one section in same curve.But in the present invention In, each wing can have wing body profiles line that is independent, being not affiliated with same surface of revolution, and at least one wing Body profiles line and the body profiles line of at least another wing there is not overlapping region simultaneously collectively covering in range With coincidence point or overlapping region, remaining not overlapping region be these wings different wide region.

It is worth noting that the coverage area (namely radial cutting working range or region of wing) of wing refers to wing Radial extension between upper most inner side cutting tooth and outermost cutting tooth.It can also be between wing contour line Origin And Destination Coverage area of the radial extension as wing.Described herein collectively covers range, refers to two or more wing phases The radial working region of (being collectively responsible for) of overlapping, four-headed arrow meaning region collectively covers range as shown in Fig. 5 (a) Four-headed arrow meaning region shown in a and Fig. 5 (b) collectively covers range b, and wherein Fig. 5 (a) show on same drill bit one The body profiles line schematic diagram of long wing (the operator wing) and a short sword wing (secondary wing), Fig. 5 (b) are shown two on same drill bit The body profiles line schematic diagram of a long wing (the operator wing), it is clear that wing represented by Fig. 5 (a) and Fig. 5 (b) collectively covers range It is different.Further, each wing body profiles line, which collectively covers the coincidence point in range at it, can be the friendship of each curve Point is also possible to the point of contact between curve, the intersection point as shown in dash area 34 in Fig. 5 (a) and point of contact；Each wing body profiles It is the part that each wing body profiles line is overlapped or essentially coincides, such as Fig. 5 that line, which collectively covers the overlapping region in range at it, (a), overlapping region shown in dash area 34 in Fig. 5 (b)；On the other hand, it is collectively covering in range, wing body profiles line On except coincidence point and overlapping region (also known as with wide region) part be the not overlapping region of wing body profiles line (also Referred to as different wide region).In addition to coincidence point, the width of overlapping region and overlapping region is not defined as its width shared by the drill bit radial direction Degree.

In the prior art, the cutting contour line of each wing is overlapped as same song usually in the coverage diagram of shaft bottom on drill bit Line.And in the present invention, each wing body profiles line with not overlapping region will self-assembling formation there is not overlapping region Wing cuts contour line.The cutting contour line of drill bit is actually shape after each wing cutting contour line is superimposed in same axial plane At, as shown in Figure 11, Figure 16 and Figure 17, wherein the curve of label 11 is bit cutting contour line, and the curve of label 31 is Contour line is cut for wing.If the body profiles line of the body profiles line of some wing and another wing is collectively covering model In enclosing while there is different wide region and with wide region, then the cutting contour line of the two wings also just certainly exist overlapping region with Not overlapping region.Cutting tooth on the region that wing cutting contour line coincides, wing is synchronous working, therefore claims the region For synchronous cutting region (abbreviation retaining zone)；Similarly, the cutting tooth on the region that wing cutting contour line is not overlapped, wing It works asynchronous, therefore the region is asynchronous cutting zone (abbreviation asynchronous area).Obviously, the different wide region of wing body profiles line It is then corresponding with retaining zone with exterior feature region corresponding to the asynchronous area of wing cutting contour line.

For two wings with asynchronous area, the cutting tooth of two wing asynchronous areas is not started simultaneously to enter and be cut Work is cut, but part cutting tooth (cutting tooth closer from shaft bottom) first starts rock cutting, it is other with the abrasion of cutting tooth Cutting tooth (cutting tooth of asynchronous area) can just touch rock and start rock cutting work.It is cut with this asynchronous area The wing of the asynchronous work characteristics of tooth is known as asynchronous cutting wing (referred to as asynchronous wing).Drill bit comprising asynchronous wing is referred to as different Walk cut drill (referred to as asynchronous drill bit).

For asynchronous drill bit, if there was only a single point or single very narrow on the cutting contour line of certain asynchronous wing thereon Region coincides or essentially coincides with bit cutting contour line, then means the cutting contour line of the wing in this point or very It is evagination on position where narrow region.Obviously, be to work from the beginning in the cutting tooth of boss, with this or The continuous abrasion of these teeth just gradually starts contact and rock cutting on wing from the farther away cutting tooth in shaft bottom.Equally, if certain There are several points or several mutually intermittent regional areas mutually be overlapped with bit cutting contour line on the cutting contour line of asynchronous wing It closes, then the cutting contour line of the wing is local evagination in these positions, and remaining region is then with respect to bit cutting contour line Farther out, therefore at the beginning of the drilling process of drill bit, only the cutting tooth at these evagination positions is in rock cutting, remaining is farther out from shaft bottom Cutting tooth then the cutting tooth in male part position just progresses into the process of rock cutting after wearing up to a certain degree, to realize same Different parts cutting tooth works stage by stage on one wing.Obviously, asynchronous wing is substantially exactly to have part cutting feature Wing, when the bit pressure that wing undertakes is identical, the ratio that this wing acts on rock in local cutting zone presses obvious exceed Conventional wing.Asynchronous wing number is more, and this promotion is more significant than the effectiveness of pressure (referred to as pressurization effectiveness).If drill bit all knives The wing all uses asynchronous wing, then drill bit can be described as disparate step drill bit at this time, and pressurization effectiveness is more prominent, is advantageous to be promoted Ability of the drill bit in bad ground intrusion rock.

It is corresponding to foregoing teachings, if participating in several regional areas that have of initial cuts on asynchronous wing, cut profile Line should be evagination, the wing body profiles line naturally also evagination of corresponding position in these regional areas.That is, wing sheet There are several local crownings, to keep the shape of wing body profiles presentation ridges and peaks or heaving of the sea shape special on body contour line Sign, as shown in Fig. 6, Figure 11 and Figure 16.Local Convex for the different asynchronous wing of two body profiles shapes, on wing Rise it is more, then collectively covered within region at it, the intersection or crosspoint between two wing body profiles lines are more.If will bore The local crowning of multiple asynchronous wings is interspersed on head, can be completed using mutually overlapping multiple local crownings to bottom Divide the covering of even whole radial zones.In drilling process, as long as the local crowning on drill bit is not smoothed, pressurized effect To some extent there is.In addition, the height of local crowning can be significantly high higher than the diameter (knuckle-tooth) of cutting tooth or work It spends (non-knuckle-tooth), height is bigger, and not only the pressurization shear action timeliness of wing is longer, the length of another aspect wing body profiles line Degree is also longer, and the cloth tooth region on naturally same wing is bigger, and cutting tooth quantity is also more, and the number of teeth increases and cutting tooth The feature to work stage by stage is mutually matched, thus increasing work of the wing drilling than extending asynchronous drill bit on the basis of pressure Service life.

Therefore, according to above to the object of the invention and rationale, it is possible to understand that and confirmation, the present invention are defined " the body profiles line of wing and the body profiles line of other wings there is at least one not to be overlapped area collectively covering in range Domain (or for different wide region) " should not do absolute understanding, i.e., should not be certain to be not intended to that may be present in the prior art Under knowing or under accidental or for the body profiles line and other knives with caused wing under the other purposes of wide of the mark of the present invention The body profiles line of the wing there are it is lesser degree of be not overlapped cover including；Those skilled in the art be based on aforementioned the object of the invention and Rationale obviously can be correct for the degree of " the not overlapping region " according to the prior art of grasp, common knowledge Understand, without especially being defined；Typically, it of the invention " promote drill bit in order to preferably realize and is invaded in bad ground The ability of rock " purpose, this does not account for and entirely collectively covers the ratio of range areas and be preferably not less than 25% in overlapping region

Preferably, being at least whole or big there are two the body profiles line of neck eye section and/or two reaming hole section wings The curve of part evagination, and each neck eye section wing body profiles line curve concave portion vertex is along the radial position of drill bit radial direction Set not identical, the axial position on each reaming hole section wing body profiles line curve concave portion vertex is not identical.

In the present solution, the outer substantial only a fraction of convex domain of wing body profiles line correspond to wing cutting contour line with The region (retaining zone) that bit cutting contour line coincides；And remaining region on wing body profiles line is cut corresponding to wing Cut the region (asynchronous area) that contour line is not overlapped with bit cutting contour line.The radial position on the vertex of two wing concave portions It sets not identical, wing cutting contour line can just be made to coincide in vertex corresponding position and bit cutting contour line in design, The cutting tooth of two wing vertex and adjacent locations just becomes the initial cutting tooth for participating in work at this time, and cutting far from the region Cutwork wouldn't be participated in by cutting tooth (except retaining zone).In this way, the ratio pressure acted in initialization cutting tooth is higher than routine Drill bit is conducive to the ability for improving drill bit intrusion rock.

Preferably, being at least to have at least there are two the body profiles line of neck eye section and/or two reaming hole section wings The curve of one local crowning, and respectively have at least one local crowning along drill bit radial direction or along bit cutting wheel between the curve Profile partly or entirely mutually staggers.

It is different from whole or most of wing body profiles line of evagination only in aforementioned schemes, the wing in this programme Body profiles line has multiple local crownings, and therefore, the distribution of each local crowning can have different situations, to lead eye section wing For body profiles line, as shown in Figure 4, wherein Fig. 4 (a) show each neck eye section wing body profiles line local crowning along brill Head radial distribution, and local crowning is part or all of along drill bit radial (direction arrow A in figure) on different wing body profiles lines It is staggered；Fig. 4 (b) show each neck eye section wing body profiles line local crowning and is distributed along bit cutting contour line, and different Local crowning is partly or entirely staggered along bit cutting contour line (direction arrow B in figure) on wing body profiles line.It is worth saying Bright, the distribution of represented local crowning and displaced manner are only two kinds of more typical distributions in Fig. 4 (a) and Fig. 4 (b) Mode, but it is not limited to the two ways.

In above scheme, wing body profiles line is the curve with one or more local crownings, can in design So that wing cutting contour line coincides in the vertex corresponding position of local crowning with bit cutting contour line, each wing office at this time The vertex of portion's protrusion and the cutting tooth of adjacent locations just become the initial cutting tooth for participating in work, and the cutting tooth far from the region (except retaining zone) wouldn't participate in cutwork.Such structure makes drill bit in drilling process, on synchronization wing only There is the part cutting tooth contact shaft bottom at the top of local crowning, reduces the contact area of drill bit and rock, the ratio in cutting tooth Pressure is higher than conventional bit, enables the effective wedging stratum of drill bit；Even if drill bit is worn, part cutting tooth is caused to be destroyed, Remaining part cutting tooth following contacts shaft bottom not being worn is still suffered from, cutwork is put into, guarantees that drill bit creeps into overall process All it is high specific pressure, is conducive to the raising of drill bit rate of penetration.

Secondly, the wing body profiles line to rise and fall joins the cutting tooth on same wing body profiles line stage by stage With broken rock, also make its cloth tine length longer, with regard to more, the number of teeth increases and cutting tooth point the cloth number of teeth amount on naturally same wing The feature of stage work is mutually matched, thus increasing working life of the wing drilling than extending drill bit on the basis of pressure.

Meanwhile having the presence of several local crownings on wing, the chip space of drill bit is increased, landwaste is reduced and is cutting Accumulation near tooth is conducive to the heat dissipation and cooling of cutting tooth, reduces the thermal wear of cutting tooth, improve drill bit from another point of view Working performance.

Preferably, the neck eye section of at least 40% quantity and/or the body profiles line of reaming hole section wing are to have extremely The curve of a few local crowning, and respectively have at least one local crowning along drill bit radial direction or along bit cutting between the curve Contour line partly or entirely mutually staggers.

In above scheme, if the wing quantity of different exterior feature is maintained at certain proportion range, can better and more scientifically it play different The asynchronous shear action of wide wing.Obviously, in this scenario 40% ratio may result in a non-integer as a result, this When, according to the understanding of common sense, need to carry out rounding: for example, a total of 6 wings of drill bit, then 40% is exactly 2.4, rounding 2 A wing.

Preferably, being at least the song at least one local crowning there are two the body profiles line of neck eye section wing Line, and the not overlapping region width of the curve at least accounts for a quarter of drill bit radius.

In above scheme, if asynchronous area range is maintained at certain proportion, the asynchronous cutting of drill bit can be preferably played Effect.The width for increasing asynchronous area can allow the service life of cutting tooth in drill bit each region to be mutually matched, and reach reduction drilling The purpose of cost.

Preferably, being at least the song at least one local crowning there are two the body profiles line of neck eye section wing Line, and the local crowning mutually staggered between the curve is distributed in the radial zone other than drill bit one third radius.

PDC drill bit is generally located in the radial zone other than drill bit one third radius in crown, crown (also referred to as nose) with And and crown it is very fast with the cutter-wear rate of exterior domain (external taper and shoulder).On the one hand, the cutting tooth in crown region More sensitive to the variation (such as soft or hard alternately stratum) of formation lithology positioned at the least significant end of drill bit, drill bit is passing through soft or hard friendship When the interface replaced, it be easy to cause the overload of crown region cutting tooth and collapses the failure phenomenons such as damage.On the other hand, other than crown The cutting tooth in region movement velocity during rock cutting is higher, and when hard formation and heterogeneity stratum are crept into, cutting tooth is rushed It is relatively large to hit load, frictional heat generation is also than more serious, so the speed of its wear-out failure is apparently higher than close to centre Cutting tooth.Using the above scheme, asynchronous area can cover the fireballing region of cutting tooth failure on drill bit, to significantly improve brill Head these positions can wear height, increase cutting structure intrusion rock ability, promoted bit life, reduce drilling at This.

Preferably, being at least the song at least one local crowning there are two the body profiles line of neck eye section wing Line, and the local crowning mutually staggered between the curve is distributed in the radial zone within 2/3rds radius of drill bit.

Under certain special operation conditions, during combined drilling, drill bit movement complicated condition, not there is only oscillation crosswise, And there are shimmy, and drill bit is likely to be at the working condition not parallel with hole axis.Under these conditions, drill bit internal The cutting tooth in region is easy that Fast Wearing occurs because of unbalance loading.Since the interior zone number of teeth of PDC drill bit is less, so, once Individual tooth failures, it is easy to chain reaction occur, lead to the generation of internal ring cutting failure phenomenon, this failure phenomenon is commonly called as " drawing The heart " phenomenon.In the program, asynchronous area is arranged in the region within 2/3rds radius of drill bit, drill bit can be significantly improved These positions can wear height, to extend service life of the PDC drill bit under the Special complexes operating condition such as combined drilling, Reduce the generation for even avoiding phenomenon from the bottom of one's heart.

Preferably, the neck eye section of at least 50% quantity and/or the local crowning shape of reaming hole section wing body profiles line It is similar or identical.

Obviously, in this scenario 50% ratio may result in a non-integer as a result, at this time, it may be necessary to being justified It is whole.For example, a total of 5 wings body profiles line of drill bit, then 50% is exactly 2.5, rounding is 2 wing body profiles lines.

Preferably, the height of all neck eye section wing body profiles line local crownings is not less than 8mm.

Preferably, being at least the song at least one local crowning there are two the body profiles line of neck eye section wing Line, overlapping region is not distributed in drill bit radial direction one third with exterior domain between the curve, and the height of local crowning is from boring Head center becomes larger outward.

In the program, the height of neck eye section wing body profiles line local crowning becomes larger outward from bit central, makes The bad grounds such as high abrasive stratum, gravel layer can be better adapted to by obtaining drill bit, and under the high speed conditions such as combined drilling, Extend the working life of these region cutting tooths using asynchronous cutting principle.

Preferably, different exterior feature wing leads the local crowning height of eye section crown region or nasal region to be greater than other in drill bit Region.

When drill bit passes through the heterogeneities formation condition such as interlayer, gravel layer, nose, the shoulder of drill bit often carry a large amount of broken Rock load, power consumption, so that the cutting tooth Fast Wearing at these positions, and then make drill bit premature failure.In the program, by increasing The local crowning of drill bit crown region or nasal region not only improves drill bit in the rock wedging ability at these positions, also increases It has been added to wear length, to extend bit life on the basis of promoting drilling efficiency.

Preferably, being at least to have at least there are two the body profiles line of neck eye section and/or two reaming hole section wings The curve of one local crowning, at least one part between each neck eye section and/or two reaming hole section wing body profiles lines Protrusion is overlapped or is essentially coincided, and first group that the local crowning that coincides is arranged between different wing body profiles lines is cut Tooth is cut to mutually stagger.

Preferably, at least one neck eye section and/or reaming hole section wing simultaneously have preposition wing body profiles line and At least one postposition wing body profiles line, preposition wing body profiles line and postposition wing body profiles line are to have at least The curve of one local crowning.It is preferred that local crowning is partly or entirely mutually wrong along drill bit radial direction or along bit cutting contour line It opens.

Above scheme is substantially to merge the cutting structure of two asynchronous wings on a wing body.In the program, Two different wing body profiles lines are provided at least two rows of cutting tooths on same wing, therefore wing number can not be increased Under conditions of amount, increase the cutter set density of drill bit, strengthen the asynchronous cutting structure of drill bit, while being also conducive to expand the stream of drill bit Road more sufficiently, effectively utilizes bit operation space, improves the comprehensive performance of drill bit.

Preferably, at least one neck eye section and/or reaming hole section wing simultaneously have preposition wing body profiles line and At least one postposition wing body profiles line, preposition wing body profiles line and postposition wing body profiles line are to have at least At least respectively there is a local crowning on the curve of one local crowning, the neck eye section and/or reaming hole section wing body profiles line It overlaps or essentially coincides, and be arranged in first group of cutting tooth phase of the local crowning that coincides on different wing body profiles lines Mutually it is staggered.The asynchronous cutting structure of privileged sites on drill bit can be made to be strengthened in this way.

It is cut preferably, being provided with second group of at least one proud exposure less than or equal to zero on the neck eye section wing The second group of cutting tooth cutting tooth or at least one empty slot or/and being fixed in empty slot.

Second group of cutting tooth and sky in the program, relative to its proud exposure of wing body profiles line less than or equal to zero Slot (including built-in tooth and built-in table are inserted etc.) be simutaneously arranged in a mixed way in wing body, wing can not only be greatly increased Length is worn, wing body space is also effectively utilized, while ensuring to creep into than pressure, further extends bit life.

Preferably, whole or most of evagination or the corresponding knife of local crowning on the neck eye section wing body profiles line Be disposed in wing area at least one proud exposure less than or equal to zero second group of cutting tooth or at least one empty slot or/ With second group of cutting tooth being fixed in empty slot.

In the program, since the local crowning drilling of wing body is higher than pressing, cutting tooth arranges negligible amounts, therefore relatively general Logical wing is easier to wear, and after the abrasion of this part wing body, region setting empty slot can be such that worn-out cutting tooth carries in outside Wing body is detached under lotus rapidly, and then exposes empty slot and second group of cutting tooth, worn-out region is repaired, is being guaranteed On the basis of drilling life of bit, the ability of bit cutting rock updated.

Preferably, corresponding to the wing cutting contour line and bit cutting contour line of wing body profiles line local crowning It is tangent.

Preferably, corresponding to the wing cutting contour line and bit cutting contour line of wing body profiles line local crowning It partially overlaps.

Preferably, the re-drill bit is ladder (concentric) re-drill bit (single-stage or multistage).Ladder (concentric) is with brill Re-drill bit generates reaming hole step in shaft bottom by reaming hole section, and the rock at step is more easily broken so that more bit pressures are divided It is fitted on neck eye section, also improves wellbore quality while increasing efficiency of breaking rock.

Preferably, the re-drill bit is diplocardia re-drill bit (single-stage or multistage).Diplocardia reaming while drilling drill bit is usually For the reaming while drilling construction under the conditions of old well depth brill, sidetracking etc., have safe and reliable, rate of penetration is high, bit pressure and torque compared with The advantages that small.

Preferably, the cutting tooth is composite polycrystal-diamond, polycrystal diamond composite teeth, thermostabilization plycrystalline diamond Buddha's warrior attendant Stone cutting tooth, natural diamond cutting tooth, impregnated Adamas cutting tooth, carbide cutting tooth, cubic boron nitride cutting tooth, pottery Porcelain cutting tooth or cutting tooth comprising diamond or cubic boron nitride.

The foregoing main solution of the present invention and further alternatives thereof can be freely combined to form multiple schemes, be this Invention can be used and claimed scheme；And it is of the invention, between (each non conflicting selection) selection and between other selections It can also be freely combined.Those skilled in the art, which can be illustrated after understanding the present invention program according to the prior art and common knowledge, to be had Multiple combinations are the claimed technical solution of the present invention, do not do exhaustion herein.

Explanation of nouns:

The proud exposure of cutting tooth: refer to the distance on the highest point to wing body profiles line of cutting land.Exposure is high Degree can be just, be it is negative, can also be equal to zero, when cut land be exposed to except wing ontology when, the proud exposure of tooth is positive Value.

First group of cutting tooth: it is arranged in the cutting tooth that proud exposure on the wing body cloth flank of tooth is greater than zero.

Second group of cutting tooth: being arranged on wing, and is less than or equal to zero relative to wing body profiles line proud exposure Cutting tooth.Interior inserted and built-in table is inserted etc. to belong to second group of cutting tooth.

It is interior inserted: to be less than or equal to zero cutting tooth relative to wing body profiles line proud exposure, cutting tooth is in addition to cutting Other surfaces (mainly side and bottom end face) and the comprehensive engagement of wing body other than working face, and closed by this contact System realizes the consolidation of cutting tooth.

Empty slot: being set on the wing body below first group of cutting, can be through slot, can also be non-through blind slot. The effect of empty slot first is that can play reduce bit wear after the invalid bit pressure unfavorable to rock cutting that is undertaken of wing ontology, Second is that providing cloth tooth space for built-in table is inserted.

Built-in table is inserted: being fixed in the empty slot being arranged on wing body, and its land exposure empty slot surface where it Cutting tooth.After first group of cutting tooth and completely worn out wing ontology in built-in table inserted front, built-in table is inserted can be as One group of cutting tooth rock cutting like that in a manner of the inserted high specific pressure of table, obtains the stock-removing efficiency of drill bit a degree of extensive It is multiple.

Cloth tooth shaft face or axial plane: by the plane of drill bit central axis, it is mainly used for expressing the diameter of each cutting tooth on drill bit To and axial position and cutting tooth to the coverage condition of bottom rock and the elementary contour feature in shaft bottom.

Shaft bottom coverage diagram: when drill bit rotates under conditions of axial position is constant around own axes, the land of cutting tooth Contour line and axial plane are crossed to form intersection, which is the axial plane contour line of cutting tooth, then by the axial plane wheel of all main cutting teeth Profile collects in the axial plane, is formed the axial plane cloth tooth figure of drill bit.It is cut on drill bit because axial plane cloth tooth figure can accurately reflect Tooth is cut to the coverage condition of bottom rock, therefore is called shaft bottom drape tooth figure, abbreviation drape tooth figure or shaft bottom coverage diagram.

Bit cutting contour line: in the coverage diagram of shaft bottom, one, work is tangent with the axial plane contour line of all main cutting teeth External envelope curve, as bit cutting contour line.The curve characterizes the elementary contour feature in the drilled out shaft bottom of drill bit.

Wing cuts contour line: in the shaft bottom coverage diagram of drill bit, only specifying the cutting tooth on wing to represent some Come, and the cutting tooth on other wings is concealed, is formed the axial plane cloth tooth figure of the wing.In the axial plane cloth tooth figure of wing In, make an external envelope curve tangent with the axial plane contour line of each main cutting tooth, which is the cutting wheel of the wing Profile.

Wing body profiles line: it is defining in cloth tooth shaft face, if drill bit is under conditions of axial position is constant around itself axis Line rotation, then for a certain wing body, the intersection of leading flank and its cloth flank of tooth will scan to form one with the rotation of drill bit The intersection of a space curved surface, the space curved surface and axial plane is the body profiles line of wing.

Preposition, postposition wing body profiles line: if by two or more respectively adjacent with wing body profiles line Wing merges into same wing, then just will appear a plurality of wing body profiles line, in this case, edge on the wing body after merging Bit direction forefront is known as preposition wing body profiles line, remaining is postposition wing contour line.Same wing body On adjacent blades body profiles line between may also set up the necessary structure such as runner, hydrophthalmia and nozzle.

Compared with prior art, the beneficial effects of the present invention are:

(1) different wide wing body profiles line is that height rises and falls and curve interlaced with each other, the curve are in the present invention It is formed by connecting by multiple local crownings.On the one hand tooth contact shaft bottom is cut in the part on different wide wing, reduces cutting tooth and rock The contact area of stone, cutting tooth generate high specific pressure, make the effective wedging stratum of drill bit.On the other hand, even if drill bit has abrasion In the case of, still only tooth contact shaft bottom is cut in part, so that drill bit creeps into state all in high specific pressure in entire drilling process, Be conducive to drill bit in high-intensitive, high abrasive stratum rate of penetration raising.

(2) the wing body profiles line of drill bit of the present invention is not identical, forms superposition in drill bit overlay area, can increase The axial wear volume of drill bit, extends the service life of drill bit；Even if there is individual cutting tooth failures or abrasion, also do not easily cause The chain failure for the tooth shaft bottom adjacent annular bands cutting tooth that fails, can effectively avoid each wing ontology in same radial region while occur The situation contacted with bottom rock, be beneficial to prevent drill bit causes to fail because of ring cutting phenomenon.

(3) the wing body profiles line length to rise and fall is longer, and the cloth number of teeth amount on naturally same wing is with regard to more, the number of teeth Increase is mutually matched with the feature that cutting tooth works stage by stage, thus improving wing drilling than extending brill on the basis of pressure The working life of head.

(4) the different wide region of high-ranking military officer's eye section wing body profiles line of the present invention is arranged in other than drill bit one third radius Radial zone can increase drill bit crown and the friction durability with exterior domain, thus the work for creeping into drill bit in bad ground Performance gets a promotion.

(5) the different wide region of high-ranking military officer's eye section wing body profiles line of the present invention is arranged within 2/3rds radius of drill bit Radial zone can increase drill bit crown and the friction durability with inner region, advantageously reduce or even avoid drill bit in orientation, again Center portion failure (from the bottom of one's heart) phenomenon under the conditions of the complex drillings such as conjunction, improves bit operation ability.

(6) second group of cutting tooth is arranged in the present invention on drill bit wing ontology, makes drill bit after first group of cutting tooth fails Remain to continue working, and cutting tooth than press be higher than equal conditions under conventional bit, be conducive to promoted drill bit working life and Efficiency of breaking rock.

(7) present invention can be reduced drill bit to the sensibility of formation condition, widen drill bit to the adaptation range on stratum (from softly Layer arrives hard formation), in soft formation, the cutting tooth near local crowning can regard a big cutting element as and cut ground to scrape Layer, obtains higher rate of penetration and drilling efficiency；In hard formation, body can be worn by whole high specific pressure and axial multilayer Product, obtains higher rate of penetration and service life.

Detailed description of the invention

Fig. 1 is the structural schematic diagram of bad ground long-life re-drill bit in the embodiment of the present invention one.

Fig. 2 is the shaft bottom coverage diagram of re-drill bit in the prior art.

Fig. 3 is the wing body profiles of reamer header eye section entirety evagination and most of evagination in the embodiment of the present invention one Line schematic diagram.

Fig. 4 is that reamer header eye section wing body profiles line local crowning is radial along drill bit in the present invention and cuts along drill bit Cut the schematic diagram that contour line mutually staggers distribution.

Fig. 5 be in the present invention reamer header eye section wing body profiles line collectively cover region, coincidence point, be overlapped area The schematic diagram of domain and not overlapping region.

Fig. 6 is the neck eye section wing body profiles line schematic diagram in the embodiment of the present invention one with multiple local crownings.

Fig. 7 is the definition schematic diagram of protrusions circle point of the present invention and ledge width, height of projection.

Fig. 8 is the cloth tooth schematic diagram that the asynchronous wing of eye section is led in the embodiment of the present invention two.

Fig. 9 is the cloth tooth schematic diagram that the asynchronous wing of eye section is led in the embodiment of the present invention three.

Figure 10 is the neck asynchronous wing body profiles line schematic diagram of eye section in the embodiment of the present invention four.

Figure 11 is that the cloth tooth schematic diagram of the asynchronous wing of eye section and wing body profiles line is respectively led to show in the embodiment of the present invention four It is intended to.

Figure 12 is four reamer header eye section shaft bottom coverage diagram of the embodiment of the present invention and neck eye section cutting outline drawing.

Figure 13 is the structural schematic diagram of the embodiment of the present invention five.

Figure 14 is the structural schematic diagram of the embodiment of the present invention six.

Figure 15 is that the asynchronous wing body profiles line schematic diagram of eye section is respectively led in the embodiment of the present invention seven.

Figure 16 is the cloth tooth schematic diagram and neck eye section wing ontology wheel that the asynchronous wing of eye section is respectively led in the embodiment of the present invention seven Profile schematic diagram.

Figure 17 is the partial enlarged view that 1 local crowning of eye section wing is led in the embodiment of the present invention seven.

Figure 18 is the A-A cross-sectional view that eye section wing 1 is led in Figure 16.

Figure 19 is the neck eye section shaft bottom coverage diagram and cutting profile diagram of the embodiment of the present invention seven.

Figure 20 is the structural schematic diagram of the embodiment of the present invention eight.

Preposition wing body profiles line and postposition wing ontology wheel on the same neck eye section wing of Figure 21 embodiment of the present invention eight Profile schematic diagram.

Figure 22 is the structural schematic diagram of the embodiment of the present invention nine.

Figure 23 is the structural schematic diagram of the embodiment of the present invention ten.

Figure 24 is the structural schematic diagram of the embodiment of the present invention 11.

In figure: 1, re-drill bit ontology；1a, reamer header's eye body；1b, re-drill bit reaming hole body；11, bit cutting wheel Profile；2, connection screw thread；3, wing；31, wing cuts contour line；32, wing body profiles line；32a, (preposition) wing ontology Contour line；32b, postposition wing body profiles line；321, the convex portion of wing body profiles line；322, raised boundary point；323, Convex apexes；33, the wing cloth flank of tooth；34, wing body profiles line coincidence point or overlapping region；41, first group of cutting tooth；42a, Built-in table is inserted；It is 42b, interior inserted；5, empty slot；6, hydrophthalmia；7, nozzle.

Specific embodiment

Following non-limiting examples are for illustrating the present invention.

Embodiment 1:

As shown in Fig. 1 to Figure 24, a kind of bad ground long-life re-drill bit, including by neck eye body 1a and reaming hole body 1b structure At drill body 1 and extend from multiple wings 3 of ontology, be provided with several first group of cutting tooth 41, wing 3 on wing 3 Recess is set on the cloth flank of tooth 33 to fix first group of cutting tooth 41, is provided with hydrophthalmia 6 or nozzle in the runner between wing 7, at least one leads the body profiles line 32 of eye section and/or reaming hole section wing 3 (to may include preposition wing body profiles line 32a and postposition wing body profiles line 32b) at least another neck eye section and/or reaming hole section wing 3 body profiles line 32 There is at least one not overlapping region and at least one coincidence point or overlapping region collectively covering in range.Described first Group cutting tooth 41 can be composite polycrystal-diamond, polycrystal diamond composite teeth, thermally stable polycrystalline diamond cutting tooth, natural Adamas cutting tooth, impregnated Adamas cutting tooth, carbide cutting tooth, cubic boron nitride cutting tooth, ceramic cutting tooth or packet Cutting tooth containing diamond or cubic boron nitride.

The body profiles line of the wing 3 can be the unimodal curve of an only entirety or most of evagination, to lead eye For section wing, as shown in figure 3, being also possible to the polymodal curve as shown in FIG. 6 with multiple local crownings, wherein horizontal Direction R is drill bit radial coordinate, and vertical direction Z is drill bit axial coordinate, drill bit coverage diagram, wing body profiles line in this patent Signified drill bit radially, axially should all so understand in the schematic diagram that figure etc. indicates in drill bit axial plane, repeat no more.With drill bit Drilling direction be axis of ordinates, radial is axis of abscissas.Whole or most of evagination refers on single wing body profiles line Whole section or most of (the ratio between concave portion width and drill bit radius are greater than 1/2) be a curve in spirogyrate, the curve It is formed by connecting by one or more convex outer curve sections and one or more straightways.The body profiles curve one of existing PDC drill bit As be that another the different arc section or straightway being smoothly connected by an arc section and therewith constitute the (dotted line in such as Fig. 3 It is shown), the top area of evagination is referred to as " crown " region or the nasal region of drill bit.Commonly used by existing PDC drill bit originally Body contour curve mainly includes following several types (disregarding the small chamfering with bit gauge diameter joint): bicone: straight line is (interior Cone)+circular arc (nose)+straight line (outer shoulder)；Single circular arc type: straight line (inner cone)+circular arc (nose and outer shoulder)；Bicircular arcs type: Straight line (inner cone)+circular arc (nose)+circular arc (outer shoulder).This few class contour curve belongs to the feelings of whole or most of evagination Condition is more specifically the unimodal curve of whole evagination.As shown in Fig. 3 (a), Fig. 3 (b), wherein shown in Fig. 3 (a) Wing body profiles line is the curve of whole evagination, and wing body profiles line shown in Fig. 3 (b) is the song of most of evagination Line, the curve of label 32c are the body profiles line of conventional wing in the prior art, are marked in phantom herein, to highlight The feature of heretofore described entirety or most of evagination wing body profiles line.Fig. 8, several situations shown in Fig. 9 are these Re-drill bit respectively leads eye section wing body profiles line whole or the radial position on the vertex of most of concave portion not phase in invention Same reference example.

Local crowning in the present invention refers to that (convex portion is wide for regional area on single wing body profiles line for setting The ratio between degree and drill bit radius are less than or equal to convex portion 321 1/2), each convex portion is known as a local crowning.Structure It can be smooth curve at the curve of local crowning, be also possible to Non-smooth surface curve.It is several as shown in Fig. 6 (a), (b), (c) Kind situation, wherein the curve of label 32c is the body profiles line of conventional wing in the prior art, is marked in phantom, so as to Highlight the feature of the heretofore described wing body profiles line with multiple local crownings.Local crowning can be continuous song Wave crest and its near zone on line, such as Fig. 6 (a), the convex hull shape curve being also possible on multistage curve is gone back such as Fig. 6 (b) The protrusion that can be the broken line shapes such as rectangle, trapezoidal only lists it such as Fig. 6 (c) and the curve form of other shapes herein In more typical portion-form.What each curve local crowning was mutually staggered along drill bit radial component (preferably most of) or all Mode is distributed, and can refer to Figure 10, two kinds of situations shown in figure 15.

The elevated regions of whole or most of evagination or local crowning define, and the further width and height of protrusion Degree is defined as follows: using elevated regions circle point as calculating benchmark, any elevated regions all include Liang Ge circle point.Further, right In the region of whole evagination, raised boundary point should be respectively endpoint and wing sheet of the wing body profiles line close to drill bit center portion The separation of body contour line bizet and gage areas puts 322 as shown in Fig. 7 (a)；For most of evagination or local crowning Region, if entire protrusion occupy between two troughs of same smoothed curve, then the two troughs must have a public affairs to cut Line and inside and outside two point of contacts, the two point of contacts are its raised boundary point, and 322 are put as shown in Fig. 7 (b)；If entire protrusion Both ends are the Non-smooth surface tie point of different curved sections, then this tie point is the boundary's point for being used as the protrusion, as shown in Fig. 7 (c) Point 322；If the side of some protrusion is the continuously smooth curve with trough, the other side is previously described curved section Non-smooth surface Tie point, then the tie point is used as one of its boundary's point first, and another boundary's point is from the point to raised other side smoothed curve section The point of contact of made tangent line at trough, puts 322 as shown in Fig. 7 (d).Accordingly, certain protrusion is (including whole evagination, most of outer Convex and local crowning) width be defined as the length of the protrusion two sides circle point line, W as shown in Figure 7, height is then fixed Justice is maximum distance of the point to two sides circle point line on fillet curve, H as shown in Figure 7, obtains this most on fillet curve Point is the vertex of the protrusion at a distance.It should be noted that since the shape of protrusion can have many situations of change, on Although stating what definition was made just for limited several convex shapes, its essence spirit is equally applicable to different shape protrusion Other situations of (including whole evagination, most of evagination and local crowning).

It, can be according to actual needs in wing certain bits on the wing 3 as the further improvement of the embodiment above One of inserted 42b, empty slot 5 and the inserted 42a of built-in table or a variety of one or more in arrangement is set to cut as second group Cut tooth.

As the further improvement of the embodiment above, same wing 3 be provided simultaneously with a wing body profiles line 32a and At least one postposition wing contour line 32b, and be fixed in total along wing body profiles line 32a and wing additional wheel profile 32b At least two ranked first group cutting tooth 41.

Embodiment two

As shown in figure 8, for the cloth tooth schematic diagram of wherein certain two asynchronous wing in this example reamer header eye section, in this reality It applies in example, two neck eye section wings 3 cover whole radial zones, and body profiles line 32 is the curve of whole evagination, and Two wing body profiles lines are not overlapped in drill bit center portion area coincidence in outer side region, and the outer concave vertex 323 of two wings is same It is mutually staggered in drill bit axial plane.

Embodiment three

As shown in Fig. 9 (a), Fig. 9 (b), for wherein the cloth tooth of certain the three neck asynchronous wings of eye section shows on the present embodiment drill bit It is intended to, in the present embodiment, the body profiles line 32 of three necks eye section wing 3 is the unimodal curve of whole evagination, convex The overlay area of part 321 is played as the entire radial zone at center to the edge of drill bit, and the concave portion 321 of different wings 3 Vertex 323 mutually staggered in same drill bit axial plane.Wherein, wing body profiles line shown in Fig. 9 (a) is straight line and circular arc The more sharp curve of the outer convex domain being formed by connecting, wing body profiles line shown in Fig. 9 (b) are circular arc or generally radiused At more smooth curve.

Example IV

As shown in figs. 10-12, the present embodiment is basically the same as the first embodiment, and difference is: the neck eye section wing 3 Body profiles line 32 is the polymodal curve with multiple convex portions 321 (local crowning), and the local crowning of different wings is same It is mutually staggered in one drill bit axial plane, and corresponds to the wing cutting contour line and bit cutting of wing body profiles line local crowning Contour line is tangent.Wherein, Figure 10 is body profiles line the showing in same axial plane that the asynchronous wing of eye section is respectively led in the present embodiment It is intended to；Figure 11 is the cloth tooth schematic diagram and wing body profiles line schematic diagram that the asynchronous wing of eye section is respectively led in the present embodiment；Figure 12 It is the shaft bottom coverage diagram and cutting outline drawing of reamer header eye section in the present embodiment.

The body profiles line 32 of any of the above-described wing is different from, at least two on the body profiles line 32 of the wing 3 The height of a local crowning, local crowning is more than or equal to 8mm.

Embodiment five

It as shown in figure 13, is the drill bit structure schematic diagram of the present embodiment, the present embodiment is essentially identical with example IV, area Be not: the shape of neck eye section wing body profiles line convex portion 321 (local crowning) is trapezoidal or approximate trapezoid, and Wing cutting contour line corresponding to wing body profiles line local crowning partially overlaps with bit cutting contour line.

Embodiment six

It as shown in figure 14, is the drill bit structure schematic diagram of the present embodiment, the present embodiment is essentially identical with example IV, area It is not: is provided with interior inserted 42b on the neck eye section wing 3, second group of cutting tooth as reamer header's eye section.

Embodiment seven

If Figure 15-19 shows, the present embodiment is essentially identical with example IV, and difference is: described to lead the convex of eye section wing 3 It plays part 321 (local crowning) and its near zone is provided with empty slot 5 and the inserted 42a of built-in table, as reamer header's eye section Second group of cutting tooth.Wherein, empty slot 5 can be the through slot as run through wing front and back sides in Figure 18 (a), be also possible to such as figure The groove of recessed wing leading flank in 18 (b).Wherein, Figure 15 is the ontology wheel that drill bit respectively leads the asynchronous wing of eye section in the present embodiment Profile schematic diagram；Figure 16 is cloth tooth schematic diagram and the signal of wing body profiles line that the asynchronous wing of eye section is respectively led in the present embodiment Figure；Figure 17 is the partial enlarged view that 1 local crowning of eye section wing is led in the present embodiment；Figure 18 is neck eye section wing 1 in Figure 16 A-A cross-sectional view；Figure 19 is the shaft bottom coverage diagram and cutting outline drawing of reamer header eye section in the present embodiment.

Embodiment eight

As shown in Figure 20, Figure 21, the present embodiment and example IV are essentially identical, and difference is: same neck eye section wing 3 Have a preposition wing body profiles line 32a and at least one postposition wing additional wheel profile 32b, and along preposition wing ontology Contour line 32a and postposition wing additional wheel profile 32b are fixed at least two and ranked first group cutting tooth 41.Wherein, Figure 20 is this reality Apply the re-drill bit structural schematic diagram in example；Figure 21 is the ontology wheel of certain two asynchronous wing in the eye section of reamer header shown in Figure 20 Profile schematic diagram.

Embodiment nine

As shown in figure 22, the present embodiment is basically the same as the first embodiment, and difference is: the sheet of the reaming hole section wing 3 Body contour line 32 is the curve with multiple local crownings 321, and the local crowning of different reaming hole section wing body profiles line 32 321 mutually stagger along bit cutting contour line 11.

Embodiment ten

As shown in figure 23, be basically the same as the first embodiment for the present embodiment, difference is: the re-drill bit is ladder Formula re-drill bit.The cloth tooth signal of asynchronous wing schematic diagram (on the left of center line) and each wing as shown in the figure for the present embodiment Figure (on the right side of center line).

Embodiment 11

As shown in figure 24, the present embodiment is basically the same as the first embodiment, and difference is: the re-drill bit expands to be multistage Eye drill bit.As shown in the figure is the structural schematic diagram of the present embodiment.

The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all in essence of the invention Made any modifications, equivalent replacements, and improvements etc., should all be included in the protection scope of the present invention within mind and principle.

Claims (10)

1. a kind of bad ground long-life re-drill bit extends from neck including the drill body being made of neck eye body and reaming hole body The multiple neck eye section wings and reaming hole section wing of eye body and reaming hole body are provided with hydrophthalmia or nozzle, knife in the runner between wing Several first group of cutting tooth is provided on the wing, wing cloth flank of tooth setting recess exists to fix first group of cutting tooth, feature In: the body profiles line of at least one neck eye section and/or a reaming hole section wing is at least another neck eye section and/or separately The body profiles line of outer reaming hole section wing has at least one not overlapping region collectively covering in range, and at least one A coincidence point or overlapping region, and described these have each neck eye section of not overlapping region and coincidence point or overlapping region simultaneously Wing simultaneously participates in drilling, and has each reaming hole section wing of not overlapping region and coincidence point or overlapping region simultaneously simultaneously Participate in drilling.

2. a kind of bad ground long-life re-drill bit according to claim 1, it is characterised in that: at least there are two lead eye The body profiles line of section and/or two reaming hole section wings is the curve of whole or most of evagination, and each neck eye section knife The outer convex domain vertex of wing body profiles line is different along the radial position of drill bit radial direction, outside each reaming hole section wing body profiles line The axial position on convex domain vertex is different.

3. a kind of bad ground long-life re-drill bit according to claim 1, it is characterised in that: at least there are two lead eye The body profiles line of section and/or two reaming hole section wings is the curve at least one local crowning, and the curve it Between respectively have at least one local crowning radial along drill bit or partly or entirely mutually staggered along bit cutting contour line.

4. a kind of bad ground long-life re-drill bit according to claim 1, it is characterised in that: at least 40% quantity Neck eye section and/or the body profiles line of reaming hole section wing be the curve at least one local crowning, and the curve Between respectively have at least one local crowning radial along drill bit or partly or entirely mutually staggered along bit cutting contour line.

5. a kind of bad ground long-life re-drill bit according to claim 3, it is characterised in that: the neck eye section wing The local crowning mutually staggered between body profiles line is distributed in the radial zone other than drill bit one third radius.

6. a kind of bad ground long-life re-drill bit according to claim 3, it is characterised in that: the neck eye section wing The local crowning mutually staggered between body profiles line is distributed in the radial zone within radial 2/3rds radiuses of drill bit.

7. a kind of bad ground long-life re-drill bit according to claim 1, it is characterised in that: at least there are two lead eye Section and/or the body profiles lines of two reaming hole section wings are the curve at least one local crowning, the neck eye section with/ Or at least one local crowning is overlapped or is essentially coincided between reaming hole section wing body profiles line, and lead eye section and/or First group of cutting tooth that the local crowning that coincides is arranged between the different wing body profiles lines of reaming hole section mutually staggers.

8. a kind of bad ground long-life re-drill bit according to claim 1, it is characterised in that: at least one neck eye Section and/or a reaming hole section wing have preposition wing body profiles line and at least one postposition wing body profiles line simultaneously, Preposition wing body profiles line and postposition wing body profiles line are the curve at least one local crowning.

9. a kind of bad ground long-life re-drill bit according to claim 1, it is characterised in that: the neck eye section and/ Or second group cutting tooth of at least one proud exposure less than or equal to zero or at least one sky are provided on reaming hole section wing Slot or/and second group of cutting tooth being fixed in empty slot.

10. a kind of bad ground long-life re-drill bit according to claim 1, it is characterised in that: neck eye section and/or expansion At least one proud exposure is disposed in whole evagination or the corresponding wing region of local crowning on eye section wing body profiles line Second group of cutting tooth or at least one empty slot less than or equal to zero or/and second group of cutting tooth being fixed in empty slot.