CN106089086A - 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 bit, including the drill body being made up of neck eye body and reaming hole body, extend from leading eye body and multiple wings of reaming hole body, runner between wing is provided with hydrophthalmia or nozzle, several first group cutting tooth it is provided with on wing, the wing cloth flank of tooth arranges recess and cuts tooth in order to fix first group, and at least, also there are coincidence point or overlapping region in two neck eye sections and/or the existing misaligned region of body profiles line of two reaming hole section wings.This architectural feature can make re-drill bit work with asynchronous cutting way, the abrasion length of wing can not only be increased, extend bit life, and drill bit can be made to creep into state at whole drilling process all in high specific pressure, strengthen drill bit and invade the ability of rock, so that drill bit was all improved in drilling speed and the life-span of bad ground.

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 construction, geological drilling, tunnel The technical equipment fields such as engineering, the hydrology, shield and no-dig technique, particularly relate to a kind of Drilling bore bit.

Background technology

Along with the secondary development of casing window sidetracking and old well gets more and more, hole reaming tool is widely applied.Drilling well Reaming hole in engineering is constructed generally two ways: one, first gets out neck eyelet (i.e. pilot hole) with conventional bit, then uses expansion instead Drill or instrument carry out reaming construction, namely brill neck eye construction is carried out respectively with reaming hole construction；Two, with " expanding with boring Eye " mode, creep into while reaming hole, disposably complete to bore, expand construction.Reaming while drilling drill bit (also referred to as reaming while drilling instrument) is usual Being made up of neck eye portion (boring the part of pilot hole) and reaming hole part, neck eye portion is also referred to as pilot bit, and reaming hole part also referred to as expands Eye drill bit or hole reaming tool.Neck eye portion and reaming hole part can use integral type body construction, it is possible to use split type body Structure.Reaming while drilling instrument divides fixed and telescopic two big classes, and both differences essentially consist in the structure of reaming hole part, the former Reaming hole part be the stationary structure (or fixing toothing) without movement parts, the reaming hole cutting structure of the latter or reamer wing can With flexible.Owing to fixed reaming while drilling drill bit structure is simple, functional reliability is high, so application is the most extensive.

Fixed reaming while drilling drill bit mainly has a two types: staged and diplocardia formula.Staged re-drill bit is actually It is exactly a kind of total cost management drill bit having piece-wise step on cutting wheel profile, heart portion neck eye portion and the cutting of outside reaming hole part Tooth lays respectively at different height and positions, makes to produce on the cutting wheel profile of shaft bottom step.Because the rock at step is more broken, So when borehole size is bigger, using this drill bit can improve efficiency of breaking rock, it is simultaneously also beneficial to promote wellbore quality.

Diplocardia reaming while drilling drill bit also known as " diplocardia re-drill bit ", " Double Circular Bit ", " diplocardia hole reaming tool " etc., be one Plant one of conventional reaming while drilling instrument or re-drill bit, be frequently utilized for the reaming while drilling under the conditions of old well depth brill, sidetracking etc. and execute Work, its performance characteristics is can to get out than the hole bigger by diameter (such as casing inner diameter).In reaming while drilling instrument, PDC expands Drill bit is safe and reliable with it, rate of penetration is high for eye, the pressure of the drill and the advantage such as moment of torsion is less, becomes the main shape of reaming while drilling drill bit Formula.But, owing in use being affected by factors such as drillstring vibrations and stratum soft or hard interlock, PDC re-drill bit Cutting tooth, especially the cutting tooth of its neck eye section, is generally easy to because shock loading or the unequal factor of depth of tooth penetration caused Early destroy, thus cause drilling life of bit the longest, add time and the Financial 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 one-level counter bore diameter Structure, it is possible to for having the multistage reaming hole structure of at least 2 grades of counter bore diameters.

As conventional PDC drill bit, its neck eye section of existing PDC re-drill bit and reaming hole section the most all have several cuttves The wing, wing has been radially arranged multiple cutting element along drill bit, and (to PDC drill bit, it is multiple that cutting element is mainly polycrystalline diamond Close sheet, be called for short composite sheet or PDC tooth).In existing PDC drill bit technology, the wing in fixed cutter drill bits is all according to same Step cutting principle is designed, on the most each wing the cutting tooth of different radial positions simultaneously or synchronize (or basic simultaneously, basic Synchronize) enter duty, start to cut bottom rock, and start simultaneously at and wear and tear.Green bit is under preferable duty During (bit central stablizes, with well center superposition, the state of creeping into) drilling rock, simultaneously participate in and scrape all cutting teeth cutting rock Being main cutting tooth, main cutting tooth is the primary cutting element of drill bit fractured rock, is typically provided at the front side of each wing, with It is beneficial to reach preferably to cool down and cleaning performance.In addition to cutting tooth, standby cutting also can be set as required on drill bit Tooth (i.e. when main cutting odontotripsis to a certain extent after the cutting tooth just devoted oneself to work, such as rear toothrow etc.) and assisted machining structure (refer mainly to the structure helping main cutting tooth to break rock, as bored tooth, or the buffer structure of protection cutting tooth effect, as buffered joint or delaying Rush tooth etc.).

In PDC drill bit design process, it will usually arbitrarily determine one by the plane of drill bit central axis as cloth tooth Axial plane (is also referred to simply as axial plane), and on drill bit, the radial and axial position of each cutting tooth all can obtain table accurately on this axial plane Reach.When drill bit rotates around own axes under conditions of axial location is constant, the land contour line of cutting tooth intersects with axial plane Forming intersection, this intersection is the axial plane contour line of cutting tooth, then by main cutting teeth all on drill bit (or on some appointment wings All main cutting teeth) axial plane contour line collect in this axial plane, be the formation of axial plane cloth tooth figure (or some appointment cuttves of drill bit The axial plane cloth tooth figure of the wing).Because axial plane cloth tooth figure can accurately reflect the cutting tooth radial direction coverage condition to bottom rock on drill bit, Therefore it is again shaft bottom drape tooth figure, it is called for short drape tooth figure or shaft bottom coverage diagram.

In the shaft bottom coverage diagram of drill bit, make an external envelope tangent with the axial plane contour line of all main cutting teeth bent Line, is the cutting wheel profile (namely crown profile line of drill bit) of drill bit, as in figure 2 it is shown, be re-drill bit in prior art Shaft bottom coverage diagram, wherein, horizontal direction R is drill bit radial coordinate, and vertical direction Z is drill bit axial coordinate, the song of label 11 Line is the cutting wheel profile of drill bit in 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 certain, and by other cutter Cutting tooth on the wing conceals, and is the formation of the axial plane cloth tooth figure of this wing.In the axial plane cloth tooth figure of wing, make one and each master Cutting the external envelope curve that the axial plane contour line of tooth is tangent, this envelope is then referred to as the cutting wheel profile of this wing.Wing Cutting wheel profile reflects and (the shaft bottom radial portion at this wing place can be completely covered when the distribution of main cutting tooth is the closeest on wing Territory) time, the basic or desired profile shape feature in the shaft bottom that this wing independently cuts.

If drill bit rotates around own axes under conditions of axial location is constant, then for a certain wing body, on front side of it Face will form a surface of revolution with drill bit central axis as axis along with the rotation of drill bit is scanned with the intersection of its cloth flank of tooth, The intersection of this surface of revolution and axial plane is the body profiles line of wing, as in figure 2 it is shown, be wherein numbered the curve of 32, is The body profiles line of wing.Under normal circumstances, it is identical owing to being arranged in the proud exposure of the main cutting tooth on the wing cloth flank of tooth Or close (except closing on the region of gage land), so the shape of the cutting wheel profile of wing and its body profiles line substantially in Parastate, only may have notable difference in the region closing on rule footpath.Therefore, based on realizing the needs of synchronous cutting principle, existing The body profiles line having each wing of drill bit in technology coincides mutually or essentially coincides.In other words, each cutter of drill bit in theory The body profiles line of the wing is all on the same surface of revolution with drill bit central axis as axis, thus they are all identical one On bar curve or same curve one section.This feature can be referred to as concordance or the conllinear of drill bit each wing body profiles line Property.Obviously, this concordance or synteny are not only present in the body profiles line of each wing, and the cutting profile to each wing Line is also to set up.This architectural feature just so that being fixedly arranged at the main cutting tooth on each wing of drill bit can simultaneously or synchronize Cutting bottom rock, and then form pit shaft.

Utility model patent " there is the polycrystalline diamond compact bit of secondary gear structure " (Patent No.: And utility model patent " has the composite polycrystal-diamond of the longitudinal standby cutting structure of stand alone type ZL200620033337.3) Drill bit " in (Patent No.: ZL200720082270.7), all disclose one and there is the PDC drill bit of standby (two grades) toothing, Its common feature is that standby tooth is all consolidated in the bit body under main cutting tooth, and i.e. standby tooth is relative to the inside cloth of bit body Put, thus indulge at drill bit and be upwardly formed multiple step structure.The purpose arranging longitudinal standby tooth in two patents is to increase drill bit The longitudinal direction of Adamas cutting tooth can be worn and torn length, extends drilling life of bit.But the longitudinal standby tooth in above-mentioned two schemes is In inserted, and its main cutting tooth all by synchronous cutting principle work, as inserted in assisted machining structure must be at main cutting tooth Abrasion totally and body have part wears after just start working, but while interior inserted rock cutting, wing body with The contact of stratum occurrence of large-area, significantly reduces standby cutting tooth and acts on the ratio pressure of rock so that drill bit creep into effect Rate is very limited.

Similar with conventional PDC drill bit, the existing PDC re-drill bit with synchronous cutting principle is boring ground in the face of complicated difficult During layer (high rigidity, high abrasive or even containing the heterogeneity such as gravel layer, interlayer stratum), not only drilling efficiency is restricted, and it makes The most undesirable with the life-span.Its main cause is: first, in order to ensure that drill bit can possess stronger wedging when hard formation creeps into Or invade the ability of rock surface, it is necessary to use the cutting tooth that size (diameter) is less, but minor diameter cuts the exposure of tooth The least, wear height can be substantially less than major diameter cutting tooth, but now cut the rate of wear of tooth faster, therefore be formed for Insoluble contradiction in one bad ground drill bit design: cut tooth according to major diameter, cutting tooth is difficult to invade rock (after particularly occurring to a certain degree to wear and tear), drill bit efficiency of breaking rock is low；Tooth, the work longevity of cutting tooth is cut according to minor diameter Order the most inadequate.Second, cut tooth when drill bit creeps in hard formation, heterogeneity stratum and be frequently subjected to stronger shock loading, easily Occur the coming off of a small amount of tooth of cutting the most individually, rupture, fragmentation, the rapid failure phenomenon such as burst apart of diamond layer, this phenomenon Once occur, the chain inefficacy that close region cutting tooth will be caused to cause because workload increases, then produce ring cutting phenomenon, The i.e. exposure part of drill bit cutting tooth in this radial zone is ground off by whole or big portion, and and then at drill bit each wing body On grind cannelure.Ring cutting phenomenon once occurs, on drill bit, the body of each wing all directly contacts with rock formation face, even if cutter Cutting tooth on the wing has the most all ground, but owing to ratio presses serious reduction, so the efficiency of breaking rock of drill bit can be remarkably decreased.Institute With, after grinding annular groove on drill bit, typically it is considered as drill bit and has lost or close to losing cutting power, not only can not reenter well and make With, even repair (changing or renovate worn-out cutting tooth) time serious and be all difficult to carry out.

In order to solve the problems referred to above, improving efficiency of breaking rock and working life that re-drill bit creeps at bad ground, this is specially Profit proposes a kind of long-life re-drill bit being applicable to bad ground and method for designing thereof.

Summary of the invention

It is an object of the invention to: a kind of bad ground long-life re-drill bit and method for designing thereof, brill can be obviously improved Head service behaviour under the formation conditions such as complicated applications condition particularly 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, including the drill body being made up of neck eye body and reaming hole body, extends from Neck eye body and multiple neck eye section wings of reaming hole body and reaming hole section wing (extend from leading the wing of eye body i.e. to lead eye section wing, prolong Stretch from reaming hole body wing i.e. reaming hole section wing.Reaming hole body can be the single-stage reaming hole body of only one-level counter bore diameter, it is possible to for having The multistage reaming hole body of at least 2 grades of counter bore diameters.Neck eye body and reaming hole body can be by threaded split-type structural, also Can be integral structure).Runner between wing is provided with hydrophthalmia or nozzle, wing is provided with several first group and cuts Cutting tooth, the wing cloth flank of tooth arranges recess in order to fix first group of cutting tooth, at least a neck eye section and/or reaming hole section cutter The body profiles line of the wing is covering jointly with the body profiles line of at least another one neck eye section and/or another one reaming hole section wing There is in the range of lid at least one misaligned region (or the most different wide region), and at least one coincidence point or overlapping region (or being referred to as with wide region).I.e., at least body profiles line of a neck eye section wing and at least another one neck eye section wing Body profiles line there is in the range of collectively covering at least one misaligned region (or the most different wide region), and at least one Individual coincidence point or overlapping region (or being referred to as with wide region), or, at least the body profiles line of a reaming hole section wing with extremely The body profiles line of few another one reaming hole section wing has at least one misaligned region in the range of collectively covering and (or is referred to as Different wide region), and at least one coincidence point or overlapping region (or being referred to as with wide region), or, an at least neck eye section Take turns with the body of at least another one neck eye section and another one reaming hole section wing with the body profiles line of a reaming hole section wing Profile has at least one misaligned region (or the most different wide region), and at least one coincidence point in the range of collectively covering Or overlapping region (or being referred to as with wide region) is because neck eye section is different with the locus of reaming hole section wing, so for The contrast of so-called " coincidence/misaligned " is to contrast between neck eye section wing and neck eye section wing, reaming hole section wing and reaming hole section cutter Contrast between the wing.Similarly, in this patent, relate to the concepts such as " coincidence/misaligned ", " mutually staggering ", " similar or identical " The most all represent and contrast between neck eye section wing and neck eye section wing, right between reaming hole section wing and reaming hole section wing Ratio, hereafter repeats no more.

For drill body involved in 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, the concept being known in the art, at this Do not repeat, be referred to as shown in Figure 13, Figure 14, Figure 20, Figure 22 and Figure 23, for the structural representation of re-drill bit of the present invention Figure, wherein, 1 for drill body, 1a be drill bit neck eye body, 1b be drill bit reaming hole body, 2 for connect screw thread, 3 be wing, 33 be cutter The wing cloth flank of tooth, 41 be first group of cutting tooth, 6 for hydrophthalmia；7 is nozzle；As shown in Figure 10, Figure 15, for neck eye section each in the present invention Wing body profiles line schematic diagram, wherein, 32 is neck eye section wing body profiles line.

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

What deserves to be explained is, the coverage of wing (namely the radial cutting working range of wing or region) refers to wing On radial extension between inner side cutting tooth and outermost cutting tooth.Can also use between wing contour line Origin And Destination Radial extension is as the coverage of wing.Specifically described herein collectively covers scope, refers to two or more wing phases Overlapping (being i.e. collectively responsible for) radially working region, the four-headed arrow indication region as shown in Fig. 5 (a) collectively cover scope Four-headed arrow indication region shown in a and Fig. 5 (b) collectively cover scope b, wherein Fig. 5 (a) show on same drill bit one Long wing (the operator wing) and the body profiles line schematic diagram of short sword wing (secondary wing), Fig. 5 (b) show on same drill bit two The body profiles line schematic diagram of individual long wing (the operator wing), it is clear that wing represented by Fig. 5 (a) and Fig. 5 (b) collectively covers scope It is different.Further, each wing body profiles line coincidence point in the range of it collectively covers can be the friendship of each curve Point, it is also possible to be 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 Line overlapping region in the range of it collectively covers is the part that each wing body profiles line overlaps or essentially coincides, such as Fig. 5 Overlapping region shown in dash area 34 in (a), Fig. 5 (b)；On the other hand, in the range of collectively covering, wing body profiles line On (be also the misaligned region of wing body profiles line except the part of coincidence point and overlapping region (also known as with wide region) It is referred to as different wide region).In addition to coincidence point, it is the most shared wide along drill bit that the width of misaligned region and overlapping region is defined as it Degree.

In the prior art, on drill bit, the cutting wheel profile of each wing generally overlaps as same song in the coverage diagram of shaft bottom Line.And in the present invention, each wing body profiles line with misaligned region will have misaligned region by self-assembling formation Wing cutting wheel profile.The cutting wheel profile of drill bit is actually each wing cutting wheel profile shape after superposition in same axial plane Becoming, 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 i.e. For wing cutting wheel profile.If the body profiles line of some wing is collectively covering model with the body profiles line of another wing Enclose and interior there is different wide region and with wide region simultaneously, then the cutting wheel profile of the two wing the most just certainly exist overlapping region and Misaligned region.In the region that wing cutting wheel profile coincides, the cutting tooth on wing is synchronous working, therefore claims this region For synchronous cutting region (abbreviation retaining zone)；In like manner, in the region that wing cutting wheel profile is misaligned, the cutting tooth on wing Work asynchronous, therefore this region is asynchronous cutting zone (abbreviation asynchronous area).Obviously, the different wide region of wing body profiles line Corresponding to the asynchronous area of wing cutting wheel profile, then corresponding with retaining zone with wide region.

For two wings with asynchronous area, the cutting tooth of two wing asynchronous area not starts simultaneously at entrance and cuts Cut work, but part cutting tooth (from shaft bottom closer to cutting tooth) first starts rock cutting, along with the abrasion of cutting tooth, other Cutting tooth (the cutting tooth of asynchronous area) just can touch rock and start rock cutting work.There is the cutting of this asynchronous area The wing of the asynchronous work characteristics of tooth is referred to as asynchronous cutting wing (being called for short asynchronous wing).The drill bit comprising asynchronous wing is the most different Step cut drill (being called for short asynchronous drill bit).

For asynchronous drill bit, if only a single point or single the narrowest on the cutting wheel profile of certain asynchronous wing on it Region coincides with bit cutting contour line or essentially coincides, then mean that the cutting wheel profile of this wing is at this point or very It is evagination on the position at place, narrow region.Obviously, the cutting tooth at boss is to work from the beginning, along with this or The continuous abrasion of these teeth, on wing, from shaft bottom, cutting tooth farther out the most gradually comes into contact with and rock cutting.Equally, if certain The regional area having several points or some mutual interruptions on the cutting wheel profile of asynchronous wing is mutually overlapping with bit cutting contour line Close, then the cutting wheel profile of this wing is local evagination in these positions, and remaining region is then relative 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 at rock cutting, and remaining is from shaft bottom farther out Cutting tooth then at male part position cutting odontotripsis to just progressing into the process of rock cutting after to a certain degree, thus realize with On one wing, different parts cutting tooth works stage by stage.Obviously, asynchronous wing substantially has local cutting feature Wing, when the pressure of the drill that wing undertakes is identical, this wing acts on the ratio of rock in the cutting zone of local and presses obvious exceeding Conventional wing.Asynchronous wing number is the most, and this effectiveness (being called for short supercharging effectiveness) promoted than pressing is the most notable.If drill bit all knives The wing all uses asynchronous wing, and the most now drill bit can be described as disparate step drill bit, and its supercharging effectiveness is more prominent, is advantageous to promote Drill bit invades the ability of rock at bad ground.

Corresponding to foregoing teachings, if participating in some regional areas that has of initial cuts on asynchronous wing, then its cutting profile Line should be evagination at these regional areas, the wing body profiles line naturally also evagination of relevant position.It is to say, wing is originally There are several local crownings, so that the shape that wing body profiles presents ridges and peaks or heaving of the sea shape is special on body contour line Levy, as shown in Fig. 6, Figure 11 and Figure 16.For the asynchronous wing that two body profiles shapes differ, the Local Convex on wing Rise the most, then, within it collectively covers region, intersection or joining between two wing body profiles lines are the most.If will bore On head, the local crowning of multiple asynchronous wings is interspersed, and the most overlapping multiple local crownings just can be utilized to complete bottom Divide the covering of even all radial zones.In drilling process, as long as the local crowning on drill bit is not smoothed, pressurized effect is just Also exist to some extent.Additionally, the height of local crowning can significantly higher than cut diameter (knuckle-tooth) or the work height of tooth Degree (non-knuckle-tooth), the biggest, not only the supercharging shear action timeliness of wing is the longest, the on the other hand length of wing body profiles line Spending the longest, the cloth tooth region on the most same wing is the biggest, and cutting number of teeth amount is the most, and the number of teeth increases and cutting tooth The feature worked stage by stage is mutually matched, thus is adding the work extending asynchronous drill bit on the basis of wing creeps into than pressure Life-span.

Therefore, according to above to the object of the invention and rationale, it is possible to understand that and confirm, the present invention is defined " the body profiles line of wing and the body profiles line of other wings have at least one misaligned district in the range of collectively covering Territory (or the most different wide region) " should not do absolute understanding, the most should be not that may be present in prior art, some is not intended to Know lower or the most lower or for the body profiles line of wing that causes under other purposes of wide of the mark of the present invention and other cuttves The body profiles line of the wing exist lesser degree of misaligned contain including；Those skilled in the art based on aforementioned the object of the invention and Rationale, according to the prior art grasped, common knowledge, the degree for described " misaligned region " obviously can be correct Understand, it is not necessary to defined especially；Typically, in order to preferably realize the present invention " promote drill bit bad ground invade The ability of rock " purpose, this misaligned region accounts for the whole ratio collectively covering range areas and is preferably not less than 25%

As preferably, at least the body profiles line of two neck eye sections and/or two reaming hole section wings is entirety or big The curve of part evagination, and described each neck eye section wing body profiles line extra curvature male portion summit is along the radial direction position of drill bit radial direction Putting and differ, the axial location on described each reaming hole section wing body profiles line extra curvature male portion summit differs.

In this programme, the outer convex domain substantially only a fraction of wing body profiles line corresponding to wing cutting wheel profile 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 misaligned with bit cutting contour line.The radial direction position on the summit of two wing concave portion Put and differ, wing cutting wheel profile just can be made to coincide with bit cutting contour line in relevant position, summit when design, Now the cutting tooth of two wing summits and adjacent locations just becomes the initial cutting tooth participating in work, and cutting away from this region Cut tooth (except retaining zone) and cutwork wouldn't be participated in.So, the ratio pressure on initialization cutting tooth is acted on higher than routine Drill bit, is conducive to improving drill bit and invades the ability of rock.

As preferably, at least the body profiles line of two neck eye sections and/or two reaming hole section wings is and has at least It is respectively arranged with at least one local crowning between the curve of one local crowning, and described curve radially or to take turns along bit cutting along drill bit Profile the most mutually staggers.

The wing body profiles line of entirety only from aforementioned schemes or major part evagination is different, the wing in this programme Body profiles line has multiple local crowning, and therefore, the distribution of each local crowning can have different situations, to lead eye section wing As a example by body profiles line, as shown in Figure 4, wherein, Fig. 4 (a) show each neck eye section wing body profiles line local crowning along boring In head radial distribution, and different wing body profiles line, local crowning is part or all of along drill bit radially (arrow A direction in figure) Stagger；Fig. 4 (b) show each neck eye section wing body profiles line local crowning and is distributed along bit cutting contour line, and different On wing body profiles line, local crowning partly or entirely staggers along bit cutting contour line (arrow B direction in figure).It is worth saying Bright, local crowning distribution represented in Fig. 4 (a) and Fig. 4 (b) and displaced manner are only two kinds and are the most typically distributed Mode, but it is not limited to this two ways.

In such scheme, wing body profiles line is the curve with one or more local crowning, just may be used when design So that wing cutting wheel profile coincides with bit cutting contour line in the relevant position, summit of local crowning, the most each wing office Summit and the cutting tooth of adjacent locations that portion is protruding just become the initial cutting tooth participating in work, and away from the cutting tooth in this region (except retaining zone) wouldn't participate in cutwork.Such structure make drill bit in drilling process, on synchronization wing only There is the part cutting tooth contact shaft bottom at the top of local crowning, reduce the contact area of drill bit and rock, the ratio on cutting tooth Pressure, higher than conventional bit, makes the effective wedging stratum of drill bit energy；Even if drill bit weares and teares, part cutting tooth is caused to be destroyed, Still suffer from remaining part not being worn cutting tooth following contacts shaft bottom, put into cutwork, it is ensured that drill bit creeps into overall process It is all high specific pressure, the beneficially raising of drill bit rate of penetration.

Secondly, the wing body profiles line of fluctuating not only makes the cutting tooth on same wing body profiles line join stage by stage With broken rock, also making its cloth tine length longer, the cloth number of teeth amount on the most same wing is the most more, and the number of teeth increases divides with cutting tooth The stage feature of work is mutually matched, thus is adding the working life extending drill bit on the basis of wing creeps into than pressure.

Meanwhile, wing has the existence of several local crownings, add the chip space of drill bit, reduce landwaste in cutting Accumulation near tooth, is conducive to heat radiation and the cooling of cutting tooth, reduces the thermal wear of cutting tooth, improve drill bit from another point of view Service behaviour.

As preferably, at least the neck eye section of 40% quantity and/or the body profiles line of reaming hole section wing be have to The curve of a few local crowning, and it is respectively arranged with at least one local crowning between described curve along drill bit radial direction or along bit cutting Contour line the most mutually staggers.

In such scheme, if the wing quantity of different exterior feature is maintained at certain proportion scope, it is possible to play different better and more scientifically The asynchronous shear action of wide wing.Obviously, the ratio of 40% may result in a non-integral result in this scenario, this Time, according to the understanding of general knowledge, need to carry out rounding: such as, a total of 6 wings of drill bit, then 40% is exactly 2.4, and rounding is 2 Individual wing.

As preferably, at least the body profiles line of two neck eye section wings is the song with at least one local crowning Line, and the misaligned peak width of described curve at least accounts for 1/4th of drill bit radius.

In such scheme, if asynchronous area scope is maintained at certain proportion, it is possible to preferably play the asynchronous cutting of drill bit Effect.The width increasing asynchronous area can allow the life-span of drill bit regional interior cutting tooth be mutually matched, and reduces and creeps into The purpose of cost.

As preferably, at least the body profiles line of two neck eye section wings is the song with at least one local crowning The local crowning mutually staggered between line, and described curve is distributed in the radial zone beyond drill bit three/Radius.

PDC drill bit is generally located in the radial zone beyond drill bit three/Radius in crown, crown (also referred to as nose) with And and crown very fast with the cutter-wear rate of exterior domain (external taper and shoulder).On the one hand, the cutting tooth in crown region Being positioned at the least significant end of drill bit, the change (replacing stratum etc. such as soft or hard) to formation lithology is more sensitive, and drill bit is passing through soft or hard friendship During the interface replaced, easily cause the overload of crown region cutting tooth and collapse the failure phenomenons such as damage.On the other hand, beyond crown Cutting tooth movement velocity during rock cutting in region is higher, cuts tooth punching when hard formation and heterogeneity stratum creep into Hitting load relatively large, frictional heat also ratio is more serious, so the speed of its wear out failure is apparently higher than near centre Cutting tooth.Using such scheme, asynchronous area can cover cuts the fireballing region of tooth inefficacy on drill bit, thus significantly improves brill Head these positions can wear height, increase cutting structure invade rock ability, promote bit life, reduce creep into into This.

As preferably, at least the body profiles line of two neck eye section wings is the song with at least one local crowning The local crowning mutually staggered between line, and described curve is distributed in the radial zone within drill bit 2/3rds radius.

Under some special operation condition, during combined drilling, drill bit movement complicated condition, do not only exist oscillation crosswise, And exist shimmy, and drill bit is likely to be at duty uneven with hole axis.Under these conditions, drill bit internal Easily there is Fast Wearing because of unbalance loading in the cutting tooth in region.Owing to the interior zone number of teeth of PDC drill bit is less, so, once Indivedual teeth lost efficacy, it is easy to chain reaction occurs, and caused the generation of internal ring cutting failure phenomenon, and this failure phenomenon is commonly called as " drawing The heart " phenomenon.In the program, asynchronous area is arranged in the region within drill bit 2/3rds radius, it is possible to significantly improve drill bit These positions can wear height, thus extend PDC drill bit service life under the Special complex operating modes such as combined drilling, Reduce the generation even avoiding phenomenon from the bottom of one's heart.

As preferably, the neck eye section of at least 50% quantity and/or the local crowning shape of reaming hole section wing body profiles line Similar or identical.

Obviously, the ratio of 50% may result in a non-integral result in this scenario, at this time, it may be necessary to justify Whole.Such as, a total of 5 wing body profiles lines of drill bit, then 50% is exactly 2.5, rounding is 2 wing body profiles lines.

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

As preferably, at least the body profiles line of two neck eye section wings is the song with at least one local crowning Line, between described curve, misaligned area distribution is in drill bit radially 1/3rd with exterior domain, and the height of local crowning is from boring Head center outwards becomes larger.

In the program, the height of neck eye section wing body profiles line local crowning outwards becomes larger from bit central, makes Obtain drill bit and can better adapt to the bad ground such as high abrasive stratum, gravel layer, and under the contour speed conditions of combined drilling, Asynchronous cutting principle is utilized to extend the working life of these regions cutting tooth.

As preferably, the different wide wing local crowning height in drill bit neck eye section crown region or nasal region is more than other Region.

When drill bit passes through the heterogeneity formation condition such as interlayer, gravel layer, the nose of drill bit, shoulder 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 Drill bit crown region or the local crowning of nasal region, not only improve the drill bit rock wedging ability at these positions, also increase Add its abrasion length, thus extend bit life on the basis of promoting drilling efficiency.

As preferably, at least the body profiles line of two neck eye sections and/or two reaming hole section wings is and has at least An at least local between the curve of one local crowning, described each neck eye section and/or two reaming hole section wing body profiles lines Projection overlaps or essentially coincides, and be arranged in the local crowning that coincides between different wing body profiles line first group is cut Cut tooth mutually to stagger.

As preferably, at least a neck eye section and/or reaming hole section wing have simultaneously preposition wing body profiles line and At least one rearmounted wing body profiles line, preposition wing body profiles line and rearmounted wing body profiles line are and have at least The curve of one local crowning.Preferably, local crowning is along drill bit radial direction or partly or entirely the most wrong along bit cutting contour line Open.

The cutting structure of two asynchronous wings is substantially incorporated on a wing body by such scheme.In the program, On same wing, two different wing body profiles lines are provided with at least two rows and cut tooth, therefore can not increase wing number Under conditions of amount, increase the cutter set density of drill bit, the asynchronous cutting structure of strengthening drill bit, be the most also beneficial to expand the stream of drill bit Road, more fully, effectively utilizes bit operation space, improves the combination property of drill bit.

As preferably, at least a neck eye section and/or reaming hole section wing have simultaneously preposition wing body profiles line and At least one rearmounted wing body profiles line, preposition wing body profiles line and rearmounted wing body profiles line are and have at least A local crowning at least it is respectively arranged with on the curve of one local crowning, described neck eye section and/or reaming hole section wing body profiles line Overlap or essentially coincide, and on different wing body profiles line, being arranged in first group of cutting tooth phase of the local crowning that coincides Stagger mutually.The asynchronous cutting structure of privileged sites on drill bit so can be made to be strengthened.

As preferably, described neck eye section wing is provided with second group less than or equal to zero of at least one proud exposure and cuts Cut tooth, or at least one dead slot is or/and second group be fixed in dead slot is cut tooth.

In the program, it is less than or equal to second group of cutting tooth and the sky of zero relative to wing its proud exposure of body profiles line Groove (including that built-in tooth and built-in table are inserted etc.) is arranged in wing body the most simultaneously, can not only be greatly increased wing Abrasion length, is also effectively utilized wing body space, while guaranteeing to creep into than pressure, extends bit life further.

As preferably, overall or most of evagination or cutter corresponding to local crowning on described neck eye section wing body profiles line Be disposed with at least one proud exposure in wing area less than or equal to second group of zero cutting tooth, or at least one dead slot or/ With the second group of cutting tooth being fixed in dead slot.

In the program, owing to the local crowning of wing body creeps into higher than pressure, cutting tooth arranges negligible amounts, the most general Logical wing is easier to abrasion, and after the abrasion of this part wing body, this region arranges dead slot can make worn-out cutting tooth carry in outside Depart from rapidly wing body under lotus, and then expose dead slot and second group of cutting tooth, worn-out region is repaired, is ensureing On the basis of drilling life of bit, the ability of bit cutting rock updated.

As preferably, corresponding to wing cutting wheel profile and the bit cutting contour line of wing body profiles line local crowning Tangent.

As preferably, corresponding to wing cutting wheel profile and the bit cutting contour line of wing body profiles line local crowning Partially overlap.

As preferably, described re-drill bit is ladder (with one heart) re-drill bit (single-stage or multistage).Ladder (with one heart) is with brill Re-drill bit produces reaming hole step by reaming hole section in shaft bottom, and rock at step is more broken makes more the pressure of the drill be divided It is fitted on neck eye section, while increasing efficiency of breaking rock, also improves wellbore quality.

As preferably, described re-drill bit is diplocardia re-drill bit (single-stage or multistage).Diplocardia reaming while drilling drill bit is usually Reaming while drilling construction under the conditions of old well depth brill, sidetracking etc., have safe and reliable, rate of penetration is high, the pressure of the drill and moment of torsion relatively The advantage such as little.

As preferably, described cutting tooth is composite polycrystal-diamond, polycrystal diamond composite teeth, thermally-stabilised glomerocryst 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 cuts tooth or the cutting tooth comprising diamond or cubic boron nitride.

Aforementioned main formula case of the present invention and each further selection scheme thereof can be this with independent assortment to form multiple schemes Invention can use and claimed scheme；And the present invention, (each non conflicting selection) select between and and other select between Can also independent assortment.Those skilled in the art can understand have according to prior art and common knowledge after understanding the present invention program Multiple combination, is the claimed technical scheme of the present invention, does not do at this exhaustive.

Explanation of nouns:

The proud exposure of cutting tooth: refer to the peak the cutting land distance to wing body profiles line.Exposure is high Degree just can be, be negative, it is also possible to equal to zero, and when cutting outside land is exposed to wing body, the proud exposure of tooth is just Value.

First group of cutting tooth: be arranged in the proud exposure cutting tooth more than zero on the wing body cloth flank of tooth.

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

Interior inserted: be less than or equal to the cutting tooth of zero relative to wing body profiles line proud exposure, cutting tooth is except cutting Other surface (mainly side and bottom end face) beyond working face and wing body comprehensive engagement, and rely on this contact to close System realizes the consolidation of cutting tooth.

Dead slot: be arranged on the wing body below first group of cutting, can be through slot, it is possible to for non-penetrating blind slot. The effect one of dead slot is can to play to reduce invalid the pressure of the drill disadvantageous to rock cutting that wing body is undertaken after bit wear, Two is to provide cloth tooth space for built-in table is inserted.

Built-in table is inserted: be fixed on wing body in the dead slot arranged, and its land exposure is in its dead slot surface, place Cutting tooth.When first group of the inserted front of built-in table cutting tooth and wing body completely worn out after, built-in table is inserted can be as the One group of cutting tooth, like that with the high specific pressure mode rock cutting that table is inserted, makes the stock-removing efficiency of drill bit obtain a certain degree of extensive Multiple.

Cloth tooth axial plane or axial plane: by the plane of drill bit central axis, be mainly used in expressing each footpath cutting tooth on drill bit To and axial location, and the cutting tooth coverage condition to bottom rock, and the elementary contour feature in shaft bottom.

Shaft bottom coverage diagram: when drill bit rotates around own axes under conditions of axial location is constant, the land of cutting tooth Contour line and axial plane are crossed to form intersection, and this intersection is the axial plane contour line of cutting tooth, then is taken turns by the axial plane of all main cutting teeth Profile collects in this axial plane, is the formation of the axial plane cloth tooth figure of drill bit.Because axial plane cloth tooth figure can accurately reflect on drill bit cut Cut the tooth coverage condition to bottom rock, therefore be again shaft bottom drape tooth figure, be called for short drape tooth figure or shaft bottom coverage diagram.

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

Wing cutting wheel profile: in the shaft bottom coverage diagram of drill bit, only specifies the cutting tooth on wing to represent certain Come, and the cutting tooth on other wing is concealed, be the formation of the axial plane cloth tooth figure of this wing.Axial plane cloth tooth figure at wing In, make an external envelope curve tangent with the axial plane contour line of each main cutting tooth, this envelope is the cutting wheel of this wing Profile.

Wing body profiles line: definition cloth tooth axial plane in, if drill bit under conditions of axial location is constant around self axle Line rotates, then, for a certain wing body, its leading flank will scan formation one along with the rotation of drill bit with the intersection of its cloth flank of tooth The intersection of individual space curved surface, this space curved surface and axial plane is the body profiles line of wing.

Wing body profiles line preposition, rearmounted: if each there is the adjacent of wing body profiles line by two or more Wing merges into same wing, then arise that a plurality of wing body profiles line, in this case, edge on the wing body after merging The referred to as preposition wing body profiles line of forefront, bit direction, remaining is rearmounted 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 is:

(1) in the present invention, different wide wing body profiles line is to rise and fall for height and curve interlaced with each other, and this curve is It is formed by connecting by multiple local crownings.Part cutting tooth contact shaft bottom on the most different wide wing, reduces cutting tooth and rock The contact area of stone, cutting tooth produces high specific pressure, makes drill bit effective wedging stratum.On the other hand, even if drill bit has abrasion In the case of, still only have part cutting tooth contact shaft bottom so that drill bit creeps into state at whole drilling process all in high specific pressure, Be conducive to drill bit in high intensity, the raising of high abrasive stratum rate of penetration.

(2) the wing body profiles line of drill bit of the present invention differs, and forms superposition in drill bit overlay area, by increasing capacitance it is possible to increase The axial wear volume of drill bit, extends the service life of drill bit；Even if occurring that indivedual cutting tooth lost efficacy or abrasion, it is not easy to cause The chain inefficacy of inefficacy tooth shaft bottom adjacent annular bands cutting tooth, can be prevented effectively from each wing body and occur in same radial region simultaneously The situation contacted with bottom rock, desirably prevents drill bit and causes because of ring cutting phenomenon losing efficacy.

(3) the wing body profiles line length risen and fallen is longer, and the cloth number of teeth amount on the most same wing is the most more, the number of teeth Increase the feature worked stage by stage with cutting tooth to be mutually matched, thus extend brill improve on the basis of wing creeps into than 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 on beyond drill bit three/Radius Radial zone, can increase drill bit crown and the friction durability with exterior domain, so that the work that drill bit creeps at bad ground Performance gets a promotion.

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

(6) present invention arranges second group of cutting tooth on drill bit wing body, makes drill bit after first group of cutting tooth lost efficacy Remain to continuous firing, and cutting tooth than pressure higher than the conventional bit under equal conditions, be conducive to promoting the working life of drill bit and Efficiency of breaking rock.

(7) present invention can reduce the drill bit sensitivity to formation condition, widens drill bit to the subject range on stratum (from soft Layer is to hard formation), in soft formation, the cutting tooth near local crowning can be regarded a big cutting element as and scrape and cut ground Layer, it is thus achieved that higher rate of penetration and drilling efficiency；In hard formation, rely on omnidistance high specific pressure and axial multilayer can wear and tear body Long-pending, it is thus achieved that higher rate of penetration and service life.

Accompanying drawing explanation

Fig. 1 is the structural representation 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 prior art.

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

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

Fig. 5 be in the present invention reamer header eye section wing body profiles line collectively cover region, coincidence point, coincidence district Territory and the schematic diagram in misaligned 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 crowning.

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

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

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

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

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

Figure 12 is the embodiment of the present invention four reamer header's eye section shaft bottom coverage diagram and neck eye section cutting profile schematic diagram.

Figure 13 is the structural representation of the embodiment of the present invention five.

Figure 14 is the structural representation of the embodiment of the present invention six.

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

Figure 16 is cloth tooth schematic diagram and the neck eye section wing body wheel of each neck asynchronous wing of eye section in the embodiment of the present invention seven Profile schematic diagram.

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

Figure 18 is the A-A sectional view leading eye section wing 1 in Figure 16.

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

Figure 20 is the structural representation of the embodiment of the present invention eight.

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

Figure 22 is the structural representation of the embodiment of the present invention nine.

Figure 23 is the structural representation of the embodiment of the present invention ten.

Figure 24 is the structural representation of the embodiment of the present invention 11.

In figure: 1, re-drill bit body；1a, reamer header's eye body；1b, re-drill bit reaming hole body；11, bit cutting wheel Profile；2, screw thread is connected；3, wing；31, wing cutting wheel profile；32, wing body profiles line；32a, (preposition) wing body Contour line；32b, rearmounted wing body profiles line；321, the bossing of wing body profiles line；322, protruding 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；42b, interior inserted；5, dead slot；6, hydrophthalmia；7, nozzle.

Detailed description of the invention

Following non-limiting examples is used for the present invention is described.

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 The drill body 1 become and the multiple wings 3 extending from body, wing 3 is provided with several first group cutting tooth 41, wing 3 Recess is set on the cloth flank of tooth 33 and cuts tooth 41 in order to fix first group, the runner between wing is provided with hydrophthalmia 6 or nozzle 7, at least the body profiles line 32 of a neck eye section and/or reaming hole section wing 3 (can comprise preposition wing body profiles line 32a and rearmounted wing body profiles line 32b) lead eye section and/or the body profiles line 32 of reaming hole section wing 3 with at least another one There is in the range of collectively covering at least one misaligned region, and at least one coincidence point or overlapping region.Described first Group cutting tooth 41 can be that composite polycrystal-diamond, polycrystal diamond composite teeth, TSP cut tooth, natural Adamas cutting tooth, impregnated Adamas cutting tooth, carbide cutting tooth, cubic boron nitride cutting tooth, ceramic cutting tooth or bag Cutting tooth containing diamond or cubic boron nitride.

The body profiles line of described wing 3 can be only an entirety or major part evagination unimodal curve, to lead eye As a example by section wing, as shown in Figure 3, it is also possible to be the polymodal curve with multiple local crowning as shown in Figure 6, wherein, level 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 In the schematic diagram that figure etc. represent in drill bit axial plane, the drill bit of indication radially, axially all should so understand, repeats no more.With drill bit Drilling direction be axis of ordinates, be radially axis of abscissas.Overall or most of evagination refers on single wing body profiles line Whole section or major part (ratio of concave portion width and drill bit radius is more than 1/2) be a curve in spirogyrate, this curve It is formed by connecting with one or more straightways by one or more convex outer curve sections.The body profiles curve one of existing PDC drill bit As be to be made up of (such as the dotted line in Fig. 3 an arc section and another different arc section or the straightway being smoothly connected therewith Shown in), the top area of its evagination is referred to as " crown " region or the nasal region of drill bit.The basis that existing PDC drill bit is commonly used Body contour curve mainly includes following several types (disregarding and the little chamfering of joint, bit gauge footpath): 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).These a few class contour curves broadly fall into entirety or the feelings of major part evagination Condition, more specifically, is the unimodal curve of overall evagination.As shown in Fig. 3 (a), Fig. 3 (b), the wherein cutter shown in Fig. 3 (a) Wing body profiles line is the curve of overall evagination, and the wing body profiles line shown in Fig. 3 (b) is the curve of major part evagination, The curve of label 32c is the body profiles line of conventional wing in prior art, marks in phantom at this, in order to highlight this Entirety described in bright or the feature of major part evagination wing body profiles line.Several situations shown in Fig. 8, Fig. 9 are the present invention Middle re-drill bit respectively leads eye section wing body profiles line overall or the radial position on summit of most of concave portion differs Reference example.

Local crowning in the present invention, refers to be arranged on regional area (bossing width on single wing body profiles line Spend with the ratio of drill bit radius less than or equal to 1/2) bossing 321, each bossing is referred to as a local crowning.Structure The curve becoming local crowning can be smooth curve, it is also possible to be non-smooth curve.Several as shown in Fig. 6 (a), (b), (c) The situation of kind, during wherein the curve of label 32c is prior art, the body profiles line of conventional wing, marks in phantom, in order to Highlight the feature of the heretofore described wing body profiles line with multiple local crowning.Local crowning can be continuous song Crest on line and near zone thereof, such as Fig. 6 (a), it is also possible to be the convex hull shape curve on multistage curve, such as Fig. 6 (b), goes back Can be rectangle, the projection of the broken line shape such as trapezoidal, such as Fig. 6 (c), and the curve form of other shapes, only list it at this In more typical portion-form.Each curve local crowning along drill bit radial component (preferably major part) or all mutually staggers Mode is distributed, and is referred to two shown in Figure 10, Figure 15 kind situation.

Overall or most of evagination, or the defining of the elevated regions of local crowning, and the most protruding width and height Degree is defined as follows: with elevated regions circle point for calculating benchmark, arbitrary elevated regions all comprises Liang Ge circle point.Further, right In the region of overall evagination, its protruding boundary point should be respectively the wing body profiles line end points near drill bit heart portion and wing basis Body contour line bizet and the separation of gage areas, the point 322 as shown in Fig. 7 (a)；For major part evagination or local crowning Region, if whole projection occupy between two troughs of same smoothed curve, then the two trough must have public affairs to cut Line and inside and outside two point of contacts, the two point of contact is its protruding boundary point, the point 322 as shown in Fig. 7 (b)；If whole projection Two ends are the Non-smooth surface junction point of different curved section, then this junction point is i.e. as boundary's point of this projection, as shown in Fig. 7 (c) Point 322；If the side of certain projection is the continuously smooth curve with trough, opposite side is previously described curved section Non-smooth surface Junction point, then this junction point is first as one of its boundary's point, and another boundary's point is from this point to protruding opposite side smoothed curve section The point of contact of made tangent line at trough, the point 322 as shown in Fig. 7 (d).Accordingly, certain projection (includes outside overall evagination, major part Convex and local crowning) width be defined as the length of this projection both sides circle point line, W as shown in Figure 7, it is the most fixed Justice is the point on fillet curve to the maximum distance of both sides circle point line, H as shown in Figure 7, fillet curve obtains this Point is the summit of this projection at a distance.It should be noted that owing to protruding shape can have a lot of situations of change, on Although stating what definition was made just for a limited number of kind of convex shape, but its essence spirit is equally applicable to difformity projection Other situation of (including overall evagination, major part evagination and local crowning).

As the further improvement of the embodiment above, can be according to the actual requirements in wing certain bits on described wing 3 The one or more of one or more put in arranging in inserted 42b, dead slot 5 and the inserted 42a of built-in table 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 rearmounted wing contour line 32b, and be fixed with altogether 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's eye section, in this reality Executing in example, two neck eye section wings 3 all cover whole radial zone, and its body profiles line 32 is the curve of overall evagination, and Two wing body profiles lines are at drill bit heart portion area coincidence, and misaligned in exterior lateral area, the outer concave vertex 323 of two wings is same Drill bit axial plane internal phase staggers mutually.

Embodiment three

As shown in Fig. 9 (a), Fig. 9 (b), on the present embodiment drill bit wherein certain three neck the asynchronous wings of eye section cloth teeth show Being intended to, in the present embodiment, the unimodal curve that body profiles line 32 is overall evagination of described three neck eye section wings 3, it is convex Play the whole radial zone at the center that overlay area is drill bit to the edge of part 321, and the concave portion 321 of different wing 3 Summit 323 stagger mutually in same drill bit axial plane internal phase.Wherein, the wing body profiles line shown in Fig. 9 (a) is straight line and circular arc The curve that the outer convex domain that is formed by connecting is the most sharp-pointed, the wing body profiles line shown in Fig. 9 (b) is circular arc or generally radiused The more smooth curve become.

Embodiment four

As shown in figs. 10-12, the present embodiment is essentially identical with embodiment one, and its difference is: described neck eye section wing 3 Body profiles line 32 is the polymodal curve with multiple bossing 321 (local crowning), and the local crowning of different wings is same One drill bit axial plane internal phase staggers mutually, and corresponds to wing cutting wheel profile and the bit cutting of wing body profiles line local crowning Contour line is tangent.Wherein, each body profiles line showing in same axial plane leading the asynchronous wing of eye section during Figure 10 is the present embodiment It is intended to；Figure 11 is cloth tooth schematic diagram and the wing body profiles line schematic diagram of each neck asynchronous wing of eye section in the present embodiment；Figure 12 It is the shaft bottom coverage diagram of reamer header eye section and cutting profile schematic diagram in the present embodiment.

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

Embodiment five

As shown in figure 13, for the drill bit structure schematic diagram of the present embodiment, the present embodiment is essentially identical with embodiment four, its district Be not: described neck eye section wing body profiles line bossing 321 (local crowning) be shaped as trapezoidal or approximate trapezoid, and Wing cutting wheel profile corresponding to wing body profiles line local crowning partially overlaps with bit cutting contour line.

Embodiment six

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

Embodiment seven

As Figure 15-19 shows, the present embodiment is essentially identical with embodiment four, and its difference is: described neck eye section wing 3 convex Play part 321 (local crowning) and near zone is provided with dead slot 5 and the inserted 42a of built-in table, as reamer header's eye section Second group cutting tooth.Wherein, dead slot 5 can be the groove as run through wing front and back sides in Figure 12 (a), it is also possible to be such as figure The groove of recessed wing leading flank in 12 (b).Wherein, during Figure 15 is the present embodiment, drill bit respectively leads the body of the asynchronous wing of eye section to take turns Profile schematic diagram；Figure 16 is cloth tooth schematic diagram and the signal of wing body profiles line of each neck asynchronous wing of eye section in the present embodiment Figure；Figure 17 is the partial enlarged view leading eye section wing 1 local crowning in the present embodiment；Figure 18 is neck eye section wing 1 in Figure 16 A-A sectional view；Figure 19 is shaft bottom coverage diagram and the cutting profile schematic diagram of reamer header eye section in the present embodiment.

Embodiment eight

As shown in Figure 20, Figure 21, the present embodiment is essentially identical with embodiment four, and its difference is: same neck eye section wing 3 Possess a preposition wing body profiles line 32a and at least one rearmounted wing additional wheel profile 32b, and along preposition wing body Contour line 32a and rearmounted wing additional wheel profile 32b is fixed with at least two and ranked first group cutting tooth 41.Wherein, Figure 20 is this reality Execute the re-drill bit structural representation in example；Figure 21 is the body 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 essentially identical with embodiment one, and its difference is: the basis of described reaming hole section wing 3 Body contour line 32 is the curve with multiple local crowning 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, essentially identical with embodiment one for the present embodiment, its difference is: described re-drill bit is ladder Formula re-drill bit.It is asynchronous wing schematic diagram (on the left of centrage) and the cloth tooth signal of each wing of the present embodiment shown in figure Figure (on the right side of centrage).

Embodiment 11

As shown in figure 24, the present embodiment is essentially identical with embodiment one, and its difference is: described re-drill bit is multistage expansion Eye drill bit.It it is the structural representation of the present embodiment shown in figure.

The foregoing is only presently preferred embodiments of the present invention, not in order to limit the present invention, all essences in the present invention Any amendment, equivalent and the improvement etc. made within god and principle, should be included within the scope of the present invention.

Claims (10)

1. a bad ground long-life re-drill bit, including the drill body being made up of neck eye body and reaming hole body, extends from neck Eye body and multiple neck eye section wings of reaming hole body and reaming hole section wing, be provided with hydrophthalmia or nozzle, cutter in the runner between wing Being provided with several first group cutting tooth on the wing, the wing cloth flank of tooth arranges recess and cuts tooth in order to fix first group, and its feature exists In: at least body profiles line of a neck eye section and/or a reaming hole section wing and at least another one neck eye section and/or another The body profiles line of an outer reaming hole section wing has at least one misaligned region, and at least one in the range of collectively covering Individual coincidence point or overlapping region.

A kind of bad ground long-life re-drill bit the most according to claim 1, it is characterised in that: at least two neck eyes The body profiles line of section and/or two reaming hole section wings is entirety or the curve of major part evagination, and described each neck eye section cutter The outer convex domain summit of wing body profiles line is different, outside described each reaming hole section wing body profiles line along the radial position of drill bit radial direction The axial location on convex domain summit is different.

A kind of bad ground long-life re-drill bit the most according to claim 1, it is characterised in that: at least two neck eyes Section and/or the body profiles line of two reaming hole section wings are the curve with at least one local crowning, and described curve it Between be respectively arranged with at least one local crowning and radially or the most mutually stagger along bit cutting contour line along drill bit.

A kind of bad ground long-life re-drill bit the most 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 with at least one local crowning, and described curve Between be respectively arranged with at least one local crowning and radially or the most mutually stagger along bit cutting contour line along drill bit.

A kind of bad ground long-life re-drill bit the most according to claim 3, it is characterised in that: described neck eye section wing The local crowning mutually staggered between body profiles line is distributed in the radial zone beyond drill bit three/Radius.

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

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

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

A kind of bad ground long-life re-drill bit the most according to claim 1, it is characterised in that: described neck eye section and/ Or be provided with at least one proud exposure second group of cutting tooth less than or equal to zero on reaming hole section wing, or at least one is empty Groove is or/and second group be fixed in dead slot is cut tooth.

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