CN203796171U - Composite drill bit - Google Patents
Composite drill bit Download PDFInfo
- Publication number
- CN203796171U CN203796171U CN201320697497.8U CN201320697497U CN203796171U CN 203796171 U CN203796171 U CN 203796171U CN 201320697497 U CN201320697497 U CN 201320697497U CN 203796171 U CN203796171 U CN 203796171U
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- drill bit
- gear wheel
- bit
- cutting
- cutting teeth
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- Expired - Lifetime
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- 239000002131 composite material Substances 0.000 title claims abstract description 33
- 230000036346 tooth eruption Effects 0.000 claims abstract description 75
- 238000013459 approach Methods 0.000 claims description 3
- 239000011435 rock Substances 0.000 abstract description 55
- 238000005553 drilling Methods 0.000 abstract description 15
- 238000007790 scraping Methods 0.000 abstract description 8
- 238000010276 construction Methods 0.000 abstract description 2
- 239000003209 petroleum derivative Substances 0.000 abstract description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 abstract 2
- 239000003345 natural gas Substances 0.000 abstract 1
- 230000002035 prolonged effect Effects 0.000 abstract 1
- 210000000515 tooth Anatomy 0.000 description 41
- 229910003460 diamond Inorganic materials 0.000 description 18
- 239000010432 diamond Substances 0.000 description 18
- 239000004744 fabric Substances 0.000 description 9
- 230000015572 biosynthetic process Effects 0.000 description 8
- 230000000694 effects Effects 0.000 description 8
- 238000010586 diagram Methods 0.000 description 5
- 229910052582 BN Inorganic materials 0.000 description 4
- PZNSFCLAULLKQX-UHFFFAOYSA-N Boron nitride Chemical compound N#B PZNSFCLAULLKQX-UHFFFAOYSA-N 0.000 description 4
- 239000000956 alloy Substances 0.000 description 4
- 229910045601 alloy Inorganic materials 0.000 description 4
- 150000001875 compounds Chemical class 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 230000007704 transition Effects 0.000 description 4
- 241000237942 Conidae Species 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 3
- 230000008901 benefit Effects 0.000 description 2
- 238000004140 cleaning Methods 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 238000005336 cracking Methods 0.000 description 2
- 238000013467 fragmentation Methods 0.000 description 2
- 238000006062 fragmentation reaction Methods 0.000 description 2
- 230000033001 locomotion Effects 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 238000005299 abrasion Methods 0.000 description 1
- 235000008429 bread Nutrition 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B10/00—Drill bits
- E21B10/46—Drill bits characterised by wear resisting parts, e.g. diamond inserts
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B10/00—Drill bits
- E21B10/46—Drill bits characterised by wear resisting parts, e.g. diamond inserts
- E21B10/50—Drill bits characterised by wear resisting parts, e.g. diamond inserts the bit being of roller type
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B10/00—Drill bits
- E21B10/46—Drill bits characterised by wear resisting parts, e.g. diamond inserts
- E21B10/54—Drill bits characterised by wear resisting parts, e.g. diamond inserts the bit being of the rotary drag type, e.g. fork-type bits
- E21B10/55—Drill bits characterised by wear resisting parts, e.g. diamond inserts the bit being of the rotary drag type, e.g. fork-type bits with preformed cutting elements
Landscapes
- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Earth Drilling (AREA)
Abstract
The utility model discloses a composite drill bit, and belongs to the technical field of drilling equipment for petroleum and natural gas, mine engineering, building foundation engineering construction, geology, hydrology and the like. The composite drill bit comprises a drill bit body and a fixed cutting structure fixedly combined with the drill bit body. The fixed cutting structure is provided with fixed cutting teeth. The drill bit body is provided with at least one cone. The cone is provided with a journal. The drill bit body is provided with a bearing hole. The cone is in rotary connection with the bearing hole in the drill bit body through the journal. The composite drill bit can realize intersecting scraping and cutting rock breaking; the rock breaking efficiency of the drilling bit is enhanced, the service life of the cutting teeth of the drill bit and the service life of the bearing can be prolonged, and the safe reliability of the drill bit is improved.
Description
Technical field
The utility model belongs to the drilling equipment technical fields such as petroleum gas, mine engineering, building foundation engineering construction, geology, the hydrology, relates to concretely a kind of composite drill bit.
Background technology
Drill bit be in drilling engineering in order to fractured rock, form the rock crushing tool of pit shaft.Rock bit and PDC drill bit are drill bits conventional in drilling engineering.The rock bit of using in drilling engineering is at present mainly tricone bit and single-cone rotary drill bit.Tricone bit is the broken rock of form impact to crush mainly, and tooth is by the impact of rock, extruding with scrape and cut fractured rock with a small amount of slippage, and its shortcoming is that capacity usage ratio is not high, efficiency of breaking rock is lower, and in the drill bit course of work, the impact that bearing is subject to is large, and dynamic load factor is large.Single-cone rotary drill bit mainly utilize tooth on gear wheel to the extruding of rock, scrape and cut effect fractured rock.No matter be single-cone rotary drill bit or tricone bit, all have a key factor that affects its application life, that is exactly bearing life.The bearing of existing rock bit is built-in bearing, and bearing type is that dead eye is set in gear wheel, and the axle journal of protrusion is set on the bit leg on drill body, and gear wheel is sleeved on and on axle journal, forms bearing pair.Because bearing is the built-in bearing being arranged in gear wheel, therefore there is following drawback in the bearing arrangement of existing rock bit: 1. in gear wheel, have dead eye, gear wheel is that shell structure is sleeved on axle journal, may cause gear wheel cracking or broken during drill bit work, forms down-hole accident; 2. on gear wheel, be provided with tooth, particularly, to insert bit, for guaranteeing cone shell quality and permanent tooth intensity, cone shell need meet certain thickness, therefore the bearing size in gear wheel can not be done intensity and the application life that bearing size too much, less has limited bearing; 3. enough large bearing width is the necessary condition that ensures bearing intensity and service behaviour, therefore, need to guarantee larger gear wheel height (distance from gear wheel baseplane to gear wheel tip), generally, the ratio of height to diameter of gear wheel (ratio of gear wheel cloth flank of tooth height and gear wheel external diameter) is all greater than 0.6, though larger ratio of height to diameter is conducive to increase the width of gear wheel inner bearing, the structure of gear wheel and the structure of drill bit have also been limited.Because bearing is arranged in gear wheel, larger gear wheel size and larger ratio of height to diameter, make the gear wheel of existing drill bit occupy preciousness on drill bit and limited space.The profile form of bearing of existing rock bit can obviously affect the bearing life of drill bit and the safety and reliability of drill bit under certain conditions.
Existing PDC drill bit all belongs to fixed cutter drill bits, as the composite polycrystal-diamond (being PDC tooth) of cutting element, according to certain rule, arranges and is cemented on drill body, forms the cutting structure of PDC drill bit fractured rock.Under desirable condition of work (being the condition that center line of bit overlaps with hole axis), when drill bit creeps into, to be responsible for broken region be relatively-stationary concentric circles endless belt to each cutting teeth.This fixed teeth PDC drill bit mainly contains the shortcoming of four aspects: first, the inefficacy of indivedual teeth on drill bit (the coming off of tooth, fracture or excessive wear etc.) can significantly increase near the live load of the PDC tooth endless belt of inefficacy tooth shaft bottom, accelerate its rate of wear, and then cause drill bit to lose efficacy in advance.The second, the rate of wear difference of the PDC tooth on the different radial zones of drill bit is obvious, and the cutter-wear rate in general bit exterior region (particularly outer 1/3 region of drill bit radius) is obviously faster than the tooth in heart portion region.The 3rd, when drill bit is when creeping into compared with hard formation, PDC tooth is difficult to invade (wedging) bottom rock surface, and particularly, when PDC tooth occurs after to a certain degree wearing and tearing, intrusion difficulty is higher, causes drill bit to skid in shaft bottom, and drilling speed is extremely slow.The 4th, PDC tooth is rock cutting continuously, because can making tooth, violent fricative heat reaches quite high temperature, when temperature surpasses certain limit, the rate of wear of PDC tooth obviously rises, thereby cause the generation of (when PDC tooth operating temperature is during higher than a certain specified temp, the phenomenon that its abrasion resistance obviously declines is called the thermal wear phenomenon of PDC tooth) of thermal wear phenomenon.
Utility model content
The purpose of this utility model is: propose a kind of can form intersect to scrape cut brokenly rock, when increasing drill bit efficiency of breaking rock, can extend Cutter and bearing life, improve the composite drill bit of the security reliability of drill bit.
The purpose of this utility model realizes by following technical proposals:
A kind of composite drill bit, comprise bit body and be cemented in the stationary cutting structure on bit body, on described stationary cutting structure, be provided with fixedly cutting teeth, on described bit body, be also provided with at least one gear wheel, described gear wheel is provided with axle journal, on described bit body, be provided with dead eye, described gear wheel is formed and is rotationally connected by the dead eye on axle journal and described bit body.
In such scheme, this composite drill bit has proposed a kind of new form of structure: between the gear wheel of conventional rock bit (and the composite drill bit with gear wheel cutting structure) and bit body, by axle journal is set on bit body, axis hole formation is set on gear wheel and is rotatably assorted.And the utility model scheme is on the contrary, axle journal is set on gear wheel, gear wheel and axle journal, as integral structure, arrange dead eye on bit body, and gear wheel and bit body are formed and are rotatably assorted by the dead eye on gear wheel axle journal and bit body.When this drill bit has conventional stationary cutting structure, also have gear wheel cutting structure, the cutting teeth on the stationary cutting structure under this form of structure acts on bottom rock in the mode of concentric circles cutting, and formation concentric circles annular is scraped and cut track; Cutting teeth on gear wheel is scraped the broken bottom rock of the mode of cutting with extruding, and the cutting teeth on gear wheel is scraped and cut track at shaft bottom formation space curve.Two covers are scraped and are cut the compound of track, will form in shaft bottom cross network and scrape and cut.
Compared with prior art, its beneficial effect is the utility model:
(1) cutting structure of the present utility model is combined by stationary cutting structure and revocable gear wheel cutting structure, fixedly the concentric circles of cutting teeth is scraped to cut to scrape to cut with the space curve of gear wheel and in shaft bottom, is formed complicated cross network and scrape and cut, it is mutually compound that two covers are scraped cut channel mark, be conducive to cutting teeth wedging formation rock, intersect to scrape and cut the fragmentation that is easier to rock, therefore the utility model can obviously improve the efficiency of breaking rock of drill bit, compared with hard formation or heterogeneity stratum, is creeping into Shi Gengneng embodiment superiority.
(2) cutting teeth on gear wheel cutting structure of the present utility model is on-fixed cutting teeth, gear wheel cutting teeth is space curve at the cut channel mark of scraping in shaft bottom, intersect broken region gear wheel cutting teeth and fixing cutting teeth are overlapping, even if there is a small amount of fixedly cutting teeth to lose efficacy, under the effect of gear wheel cutting teeth, this region still can be broken, and drill bit still can continue to creep into.Be that the intersection of the utility model combined cut structure is scraped to cut and can be reduced or avoid fixed cutter drill bits because of the drill bit initial failure that minority cutting teeth lost efficacy and brings, can extend drilling life of bit.
(3) axle journal stretching out by gear wheel baseplane between the utility model gear wheel and bit body and the dead eye on bit body form bearing pair, and gear wheel and axle journal are integral type structure, and gear wheel is no longer the shell structure of interior sky.Therefore, the intensity of gear wheel will strengthen greatly, can effectively avoid cracking or the failure phenomenon such as damaged of cone shell; Meanwhile, the permanent tooth intensity of gear wheel cutting teeth also can strengthen because of the increase of the inlaid solid degree of depth; In addition, be easy to realize larger bearing width, be conducive to reduce the possibility that cone shedding is fallen into shaft bottom.
(4) while a gear wheel being only set on bit body, the bearing arrangement form that gear wheel of the present utility model is connected with bit body can make full use of and bring into play the space on drill bit, when acquisition larger axis holds size, occupied drill bit space is relatively little, and because only have a gear wheel, so be easier to realize on small size (minor diameter) drill bit, be also more suitable for slim-hole and creep into.
(5) the utility model frees bearing in gear wheel, and gear wheel size is no longer subject to its interior bearing size and the restriction of requirement of strength, so the variation space of cone structure design is very large.The ratio of height to diameter of gear wheel can be obtained very littlely, desirable less gear wheel height under larger gear wheel diameter prerequisite, is about to limited gear wheel space fully for cloth tooth and broken rock, can be when guaranteeing gear wheel intensity, for other structures are abdicated more space.
As selection, quantity >=2 of the fixedly wing of described stationary cutting structure.
As selection, described bit body is provided with 2 to 4 gear wheels.
Gear wheel of the present utility model can be one, can be also two to four and even more.When gear wheel number of the present utility model is while being a plurality of, gear wheel can be symmetrical uniform on bit body, stability when gear wheel is evenly equipped with and is beneficial to drill bit and creeps into.
As shown in Figure 1, the plane projection by gear wheel axis, drill axis to the common vertical line perpendicular to these two lines, the projection line of gear wheel axis is AB, and the projection line of drill axis is CD, and the intersection point of AB and CD is O.The angle α of gear wheel axis and drill axis refers to, ray OA(points to spearpoint from O) and ray OC(from O, point to drill bit) between angle.When gear wheel axis is parallel with drill axis or overlap, angle α is 0 °.
Roller axle side-play amount S refers to: when gear wheel axis is not parallel with drill axis and do not overlap, gear wheel axis and through drill axis and be parallel to the distance between the plane of gear wheel axis, as shown in Figure 5, and regulation: while seeing towards bit body from gear wheel cutting profile, the relative drill axis of gear wheel axis is turned right skew for being just offset, otherwise for negative bias moves; When gear wheel axis is parallel with drill axis, roller axle side-play amount S is the distance between two axial lines; When gear wheel axis overlaps with drill axis or intersects, side-play amount S is zero.
As selection, the span of the angle α of gear wheel axis and drill axis is 0 ° of < α≤90 °, and the scope of roller axle side-play amount S is-D0/4 < S < D0/4 that D0 is bit diameter.
When 90 ° of the angle α of bit cone axis and drill axis >, the length that the region that cutting teeth on gear wheel contacts with shaft bottom makes progress in gear wheel footpath will be less than gear wheel radius, or the cutting teeth on gear wheel can not contact with shaft bottom, this will affect normal work and the broken rock of cutting teeth on gear wheel.
When roller axle has skew, on gear wheel, will have part cutting teeth and can not contact brokenly with bottom rock rock when larger (be offset), or, there is the deep (tooth enters the degree of depth of rock) that contacts of part cutting teeth and rock to contact the degree of depth (skew hour) by what be less than other cutting teeths and rock.When bit creeps into, when gear wheel rotates around drill axis, also at the axis around himself, do rotation, the cutting teeth on gear wheel is on-fixed cutting teeth, and gear wheel cutting teeth is more complicated space curve at the cut channel mark of scraping in shaft bottom.When roller axle has skew, the part cutting teeth on gear wheel contacts brokenly rock with shaft bottom, and under the effect of gear wheel rotation, gear wheel cutting teeth enters the broken rock in shaft bottom in turn by the mode to replace.The alternation in turn of gear wheel cutting teeth, what become cutting teeth continues (cutting) broken rock for intermittently breaking rock, is conducive to slow down wearing and tearing, cutting teeth cooling of gear wheel cutting teeth, is conducive to taking away and the cleaning of cutting teeth of shaft bottom landwaste.Therefore, roller axle skew can extend the application life of drill bit.
As further selection, the span of the angle α of described gear wheel axis and drill axis is 15 °≤α≤75 °, and the scope of roller axle side-play amount S is-D0/8 < S < D0/8.
The cutter-wear rate in (particularly outer 1/3 region of drill bit radius) is obviously faster than the tooth in heart portion region in bit exterior region for stationary cutting structure on drill bit, and the broken rock task amount of exterior zone is also maximum.When the span of the angle α of gear wheel axis and drill axis is during 15 °≤α≤75 °, gear wheel cutting teeth is in bit exterior region and the fixedly overlapping covering of cutting teeth, the region that can be easy to wearing and tearing at drill bit stationary cutting structure forms compound intersection and scrapes and cut, be conducive to the fragmentation of exterior zone rock, slow down the fixedly wearing and tearing of cutting teeth of this region, therefore can improve efficiency of breaking rock and the drilling life of bit of drill bit.The skew of roller axle can make the alternation in turn of gear wheel cutting teeth, but roller axle side-play amount is greatly to a certain extent time, will affect the size of bearing, unsuitable excessive for the small bits roller axle side-play amount compared with slim-hole.
As selection, the described drill bit fixedly radially overlay area of cutting teeth at least reaches 60% of drill bit radial zone, and the radially overlay area of gear wheel cutting teeth at least reaches 30% of drill bit radial zone.
The radially overlay area of the fixedly cutting teeth of drill bit at least reaches 60% of drill bit radial zone, bit cutting structure be take stationary cutting structure as main, gear wheel cutting structure is auxiliary, it can give full play on stationary cutting structure the effect of cutting of scraping of fixing cutting teeth, the space curve that is aided with gear wheel cutting teeth is scraped and is cut, reach to intersect and scrape the effect of cutting, promote the raising of drill bit efficiency of breaking rock.The stationary cutting structure of take can give full play to as main the advantage that stationary cutting structure efficiency of breaking rock is high.
As selection, the cutting contoured surface of described drill bit is spherical crown surface or approximate spherical crown surface.
When the cutting contoured surface of drill bit is spherical crown surface or approximate spherical crown surface, the shaft bottom that drill bit gets out is also spherical crown surface or approximate spherical crown surface, spherical crown surface is easy to make bit cutting work plane and shaft bottom better to coincide, and stability when drill bit creeps into, the guidance quality of creeping into and controllability are all better.
As further selection, the cutting profile work plane of described drill bit is hemisphere face or approximate hemisphere face.
Hemisphere face can make bit cutting work plane and shaft bottom reach farthest identical, and regularly, hemispherical bit cutting profile is larger with the identical area of contacting of shaft bottom for borehole diameter one, and stability when drill bit creeps into, the guidance quality of creeping into and controllability will be better.
As further selection, the cutting contoured surface of described drill bit and the cutting contoured surface of gear wheel are spherical crown surface or approximate spherical crown surface, and the centre of sphere of two spherical crown surfaces overlaps or approaches coincidence.
As selection, the scope of the ratio of height to diameter N of described gear wheel is 0 < N≤0.4.
The ratio of height to diameter of gear wheel refers to distance h (length that does not comprise axle journal, as Fig. 4, Figure 16) and the ratio between gear wheel diameter D, the i.e. N=h/D at cloth flank of tooth bottom to the gear wheel top of gear wheel.
As further selection, the scope of the ratio of height to diameter N of described gear wheel is 0.1 < N≤0.3.
Axle journal of the present utility model stretches out from gear wheel baseplane, and the dead eye being mated is arranged on bit body, and bearing size is not subject to the restriction of gear wheel size, can design as required larger bearing size to guarantee enough bearing intensity.Dead eye is set in bit body, when not affecting stationary cutting structure cloth tooth, takes full advantage of the inner space of bit body, and can make full use of abundant bit body and provide enough intensity for dead eye.Therefore bearing intensity of the present utility model and life-span will be far away higher than existing rock bit.
As preferably, at least 1 parameter on described drill bit in the angle α of the side-play amount S of at least 2 gear wheels, gear wheel axis and drill axis is unequal.
Gear wheel upper teeth material comprises carbide alloy, composite polycrystal-diamond/tooth, TSP, impregnated, natural diamond impregnated of diamond, cubic boron nitride or pottery, or the composite material that comprises carbide alloy, diamond or cubic boron nitride.
The material of the cutting teeth on stationary cutting structure comprises impregnated, natural diamond impregnated, composite polycrystal-diamond/tooth, TSP, diamond etc.
As preferably, on bit body, the fixedly cutting teeth of stationary cutting structure and the cutting teeth on gear wheel are partly or entirely PDC tooth.
The beneficial effects of the utility model: when can obviously improve the efficiency of breaking rock of drill bit, can extend the life-span of Cutter and the life-span of bearing, and then prolongation drilling life of bit, there is high safety and reliability, and this drill bit have good stability, the guidance quality of creeping into and controllability.
Accompanying drawing explanation
Fig. 1 is the structural representation of the utility model composite drill bit.
The view of Fig. 2 when to be structure shown in Fig. 1 overlook (contrary drill bit drilling direction is seen) along drill axis, i.e. top view.
The sectional view of Fig. 3 when to be the utility model dissect along the plane of crossing gear wheel axis and being parallel to drill axis.
Fig. 4 is gear wheel basic size schematic diagram of the present utility model.
Fig. 5 is roller axle side-play amount S schematic diagram.
Fig. 6 is the structural representation of the utility model composite drill bit.
The view of Fig. 7 when to be structure shown in Fig. 6 overlook (contrary drill bit drilling direction is seen) along drill axis, i.e. top view.
Fig. 8 is the structural representation of the utility model composite drill bit.
Fig. 9 is the drill bit structure schematic diagram while using diamond (PDC) cutting teeth on gear wheel of the present utility model.
The view of Figure 10 when to be structure shown in Fig. 9 overlook (contrary drill bit drilling direction is seen) along drill axis, i.e. top view.
Figure 11 is the structural representation of the utility model composite drill bit.
The view of Figure 12 when to be structure shown in Figure 11 overlook (contrary drill bit drilling direction is seen) along drill axis, i.e. top view.
Figure 13 is the structural representation of the utility model composite drill bit.
The view of Figure 14 when to be structure shown in Figure 13 overlook (contrary drill bit drilling direction is seen) along drill axis, i.e. top view.
Figure 15 is radially coverage diagram of the fixedly cutting teeth of structure drill bit shown in Figure 13 and the cloth tooth of gear wheel cutting teeth.
Figure 16 is a kind of schematic diagram of gear wheel of the present utility model.
Mark in figure: 1-gear wheel, 11-gear wheel cutting teeth, 12-axle journal, 2-bit body, 3-stationary cutting structure, 31-be cutting teeth, 4-nozzle, 5-locking ball, 6-sealing ring fixedly.
The specific embodiment
Below in conjunction with specific embodiments and the drawings, the utility model is further described.
In Fig. 1, on drill bit, be only provided with a gear wheel; In Fig. 4, between the gear wheel cloth flank of tooth and axle journal, there is step transition; In Figure 11, drill bit is provided with two gear wheels; In Figure 13, drill bit is provided with three gear wheels; In Figure 16, between the gear wheel cloth flank of tooth and axle journal without step transition.
As shown in Fig. 1 to 16, basic example is: a kind of composite drill bit, comprise bit body 2 and be cemented in the stationary cutting structure 3 on bit body 2, on stationary cutting structure 3, be provided with fixedly cutting teeth 31, on bit body 2, be also provided with at least one gear wheel 1, on gear wheel 1, be provided with gear wheel cutting teeth 11, on gear wheel 1, be provided with axle journal 12, on bit body 2, be provided with dead eye, gear wheel 1 is rotationally connected by axle journal 12 and the dead eye formation on bit body 2.Preferably, as shown in Figure 3, on gear wheel 1, be provided with nozzle bore and nozzle 4, between the axle journal 12 of gear wheel 1 and dead eye, be provided with locking device (as the locking ball 5 in Fig. 3), between gear wheel 1, gear wheel axle journal 12 and bit body 1, dead eye, be provided with sealing 6.
Preferably, quantity >=2 of the fixedly wing of stationary cutting structure 3.As selection, bit body 2 is provided with 1 or 2 to 4 gear wheels 1.Gear wheel is 1, as Fig. 1,2,3,5,6,7,8,9,10; Gear wheel is 2, as Figure 11,12, preferably, the alternate layout of gear wheel and fixedly wing; Gear wheel is 3, as Figure 13,14, preferably, the alternate layout of gear wheel and fixedly wing.
Wherein, gear wheel 1 upper tooth wheel cutting teeth 11 materials comprise carbide alloy, composite polycrystal-diamond/tooth, TSP, impregnated, natural diamond impregnated of diamond, cubic boron nitride or pottery, or the composite material that comprises carbide alloy, diamond or cubic boron nitride.
The material of the fixedly cutting teeth 31 on stationary cutting structure comprises impregnated, natural diamond impregnated, composite polycrystal-diamond/tooth, TSP, diamond etc.
Preferably, gear wheel 1 upper tooth wheel cutting teeth 11 is diamond class cutting teeth, particularly elects as and is extremely applicable to scraping the PDC tooth (as Fig. 9,10) of the broken rock of butt formula.During bit work, gear wheel 1, when drill axis is rotated, also can rotate around the axis of self, and the motion of the gear wheel cutting teeth 11 on gear wheel 1 is the compound of above-mentioned two kinds of motions, and gear wheel cutting teeth 11 is scraped and cut track at shaft bottom formation space curve.Cutting teeth 11 on gear wheel is when contacting mutual effect with rock, its direction of scraping the speed of cutting with respect to rock is in continuous variation, when roller axle has obvious skew, part cutting teeth on gear wheel 1 contacts brokenly rock with shaft bottom, there is part cutting teeth not contact with bottom rock, gear wheel 1 is under the effect of gear wheel rotation, gear wheel cutting teeth 11 enters the broken rock in shaft bottom in turn by the mode to replace, gear wheel cutting teeth 11 on gear wheel 1 is scraped and is cut in mutual effect process with rock, the scraping of its relative rock cut the variation of velocity attitude will be little, this is conducive to diamond class cutting teeth, particularly scraping of PDC tooth cut brokenly rock.In addition, the 11 one after the other work of gear wheel cutting teeth, what become cutting teeth continues (cutting) broken rock for intermittently breaking rock, is conducive to slow down wearing and tearing, cutting teeth cooling of gear wheel cutting teeth 11, is conducive to taking away and the cleaning of cutting teeth of shaft bottom landwaste.
Selection one as basic example: as shown in Fig. 4,16, the scope of the ratio of height to diameter N of gear wheel 1 is 0 < N≤0.4.Further, the scope of the ratio of height to diameter N of gear wheel 1 is 0.1 < N≤0.3.Between the cloth flank of tooth of gear wheel 1 and axle journal 12, have step transition, as Fig. 4, step can be used as the axial thrust face of gear wheel 1; Between the cloth flank of tooth of gear wheel 1 and axle journal 12, without step transition, as Figure 16, the end plane of axle journal can be used as the axial thrust face of gear wheel 1.
Selection two as basic example: the cutting contoured surface of gear wheel 1 dorsad drill axis towards drill bit outside, as shown in Fig. 1-3,5-14.
Selection three as basic example: the cutting contoured surface of drill bit is spherical crown surface or approximate spherical crown surface.Further, the cutting contoured surface of drill bit is hemisphere face or approximate hemisphere face, as shown in Fig. 1-3,5-12.
Selection four as basic example: as shown in Fig. 1,6,8,9, the span of the angle α of gear wheel axis and drill axis be 0 °≤| α |≤90 °, the scope of roller axle side-play amount S is-D0/4 < S < D0/4 that D0 is bit diameter.Further, the span of the angle α of gear wheel axis and drill axis be 15 °≤| α |≤75 °, the scope of roller axle side-play amount S is-D0/8 < S < D0/8.
Selection five as basic example: as shown in Fig. 6,1,8,9, angle α reduces gradually, as shown in Fig. 7,2,10, the cutting contoured surface of gear wheel is drawn close to drill bit end face gradually, until as shown in Fig. 9,10, the cutting contoured surface of gear wheel is positioned at drill bit end face and is enclosed by the cutting profile bread of stationary cutting structure around.
Selection six as basic example: as Fig. 1,3,6,8,9,11, the cutting contoured surface of drill bit and the cutting contoured surface of gear wheel are spherical crown surface or approximate spherical crown surface, and the centre of sphere of two spherical crown surfaces overlaps or approaches coincidence.
Selection seven as basic example: the described drill bit fixedly radially overlay area of cutting teeth at least reaches 60% of drill bit radial zone, and the radially overlay area of gear wheel cutting teeth at least reaches 30% of drill bit radial zone.
Selection eight as basic example: at least 1 parameter on described drill bit in the angle α of the side-play amount S of at least 2 gear wheels, gear wheel axis and drill axis is unequal.
The basic example of aforementioned the utility model and each further select example can independent assortment to form a plurality of embodiment, be that the utility model can adopt and claimed embodiment.In this programme, each selects example, with other basic examples and select example be combined all can, at this, do not do exhaustively, those skilled in the art are known numerous combinations.
The foregoing is only preferred embodiment of the present utility model; not in order to limit the utility model; all any modifications of doing within spirit of the present utility model and principle, be equal to and replace and improvement etc., within all should being included in protection domain of the present utility model.
Claims (10)
1. a composite drill bit, comprise bit body and be cemented in the stationary cutting structure on bit body, on described stationary cutting structure, be provided with fixedly cutting teeth, it is characterized in that: on described bit body, be also provided with at least one gear wheel, described gear wheel is provided with axle journal, on described bit body, be provided with dead eye, described gear wheel is formed and is rotationally connected by the dead eye on axle journal and described bit body.
2. composite drill bit as claimed in claim 1, is characterized in that: described bit body is provided with 2 to 4 gear wheels.
3. composite drill bit as claimed in claim 1, it is characterized in that: the span of the angle α of described gear wheel axis and drill axis is 0 ° of < α≤90 °, the scope of roller axle side-play amount S is-D0/4 < S < D0/4 that D0 is bit diameter.
4. composite drill bit as claimed in claim 3, it is characterized in that: the span of the angle α of described gear wheel axis and drill axis is 15 °≤α |≤75 °, the scope of roller axle side-play amount S is-D0/8 < S < D0/8.
5. composite drill bit as claimed in claim 4, is characterized in that: the described drill bit fixedly radially overlay area of cutting teeth at least reaches 60% of drill bit radial zone, and the radially overlay area of gear wheel cutting teeth at least reaches 30% of drill bit radial zone.
6. composite drill bit as claimed in claim 1, is characterized in that: the cutting contoured surface of described drill bit is spherical crown surface or approximate spherical crown surface.
7. composite drill bit as claimed in claim 1, is characterized in that: the cutting contoured surface of described drill bit and the cutting contoured surface of gear wheel are spherical crown surface or approximate spherical crown surface, and the centre of sphere of two spherical crown surfaces overlaps or approaches coincidence.
8. composite drill bit as claimed in claim 1, is characterized in that: the scope of the ratio of height to diameter N of described gear wheel is 0 < N≤0.4.
9. composite drill bit as claimed in claim 2, is characterized in that: the scope of the ratio of height to diameter N of described gear wheel is 0.1 < N≤0.3.
10. composite drill bit as claimed in claim 1, is characterized in that: at least 1 parameter on described drill bit in the angle α of the side-play amount S of at least 2 gear wheels, gear wheel axis and drill axis is unequal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320697497.8U CN203796171U (en) | 2013-11-07 | 2013-11-07 | Composite drill bit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320697497.8U CN203796171U (en) | 2013-11-07 | 2013-11-07 | Composite drill bit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203796171U true CN203796171U (en) | 2014-08-27 |
Family
ID=51378392
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320697497.8U Expired - Lifetime CN203796171U (en) | 2013-11-07 | 2013-11-07 | Composite drill bit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203796171U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103541659A (en) * | 2013-11-07 | 2014-01-29 | 杨立源 | Single-cone compound drill bit |
| CN107060653A (en) * | 2017-04-27 | 2017-08-18 | 西南石油大学 | One kind mixing broken rock mechanism and a kind of long-life Mixed drilling bit |
| CN108798514A (en) * | 2017-04-27 | 2018-11-13 | 西南石油大学 | A kind of directed drilling diamond bit |
-
2013
- 2013-11-07 CN CN201320697497.8U patent/CN203796171U/en not_active Expired - Lifetime
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103541659A (en) * | 2013-11-07 | 2014-01-29 | 杨立源 | Single-cone compound drill bit |
| CN107060653A (en) * | 2017-04-27 | 2017-08-18 | 西南石油大学 | One kind mixing broken rock mechanism and a kind of long-life Mixed drilling bit |
| CN108798514A (en) * | 2017-04-27 | 2018-11-13 | 西南石油大学 | A kind of directed drilling diamond bit |
| CN107060653B (en) * | 2017-04-27 | 2023-11-21 | 西南石油大学 | Mixed rock breaking mechanism and long-service-life mixed drill bit |
| CN108798514B (en) * | 2017-04-27 | 2024-01-05 | 西南石油大学 | Directional drilling diamond drill bit |
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Effective date of registration: 20201222 Address after: 610500 Room 202, Southwest Petroleum University science and Technology Park, 8 Xindu Avenue, Xindu District, Chengdu, Sichuan Patentee after: CHENGDU WEIYI PETROLEUM TECHNOLOGY Co.,Ltd. Address before: No.18 Fuxue Road, Changping District, Beijing 102249 Patentee before: Yang Liyuan |
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Granted publication date: 20140827 |
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| CX01 | Expiry of patent term |