CN202659148U - Disc-cutter compound drill bit - Google Patents
Disc-cutter compound drill bit Download PDFInfo
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- CN202659148U CN202659148U CN 201220225374 CN201220225374U CN202659148U CN 202659148 U CN202659148 U CN 202659148U CN 201220225374 CN201220225374 CN 201220225374 CN 201220225374 U CN201220225374 U CN 201220225374U CN 202659148 U CN202659148 U CN 202659148U
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Abstract
The utility model discloses a disc-cutter compound drill bit, belonging to the field of the rock breaking tool for the drilling equipment of petroleum and gas, mine engineering, building foundation engineering construction, geology, hydrology and the like. The disc-cutter compound drill bit comprises a drill bit body and a disc-cutter cutting structure arranged on the drill bit body, wherein the drill bit body is further provided with an impact cutting structure; the impact cutting structure comprises a force transfer mechanism for transferring impact force and impact cutting teeth; the impact cutting teeth are fixedly connected to a punch at the tail end of the force transfer mechanism; and the punch is capable of sliding or performing sliding impact in relation to the drill bit body in the impact force transfer direction. Compared with the drill bit with a disc-cutter cutting structure (also known as a wheel type drill bit), the disc-cutter compound drill bit disclosed by the utility model is advantageous for the drill bit cutting teeth to penetrate into the stratum to improve the rock breaking efficiency and also is advantageous for reducing the rate of wear of the cutting teeth, and especially has obvious technical advantages in stratum high in strength, good in abrasiveness and difficult to drill.
Description
Technical field
The utility model belongs to the drilling equipments such as petroleum gas, mine engineering, building foundation engineering construction, geology, the hydrology and uses the rock crushing tool field.
Background technology
Drill bit be in the drilling engineering in order to fractured rock, form the rock crushing tool of pit shaft.Employed conventional bit mainly contains tricone bit, polycrystalline diamond compact bit (being the PDC drill bit) and percussion bit (also claiming rotary percussion drill bit or bore bit) etc. in the drilling engineering now.
Tricone bit mainly breaks rock with the form of crushing (tooth is pressed into rock and causes catalase), applicable stratum wider range, but capacity usage ratio is not high, and efficiency of breaking rock is relatively low.Particularly when deep formation crept into, the cuttings hold-down effect in shaft bottom was fairly obvious under the high density drilling fluid action condition, and tooth is difficult to be pressed into the stratum and forms effectively fragmentation, and the drill bit rate of penetration is very limited.Bearing life is low to be one of the principal element in restriction tricone bit application life.Tricone bit needs the higher efficiency of breaking rock of large the pressure of the drill guarantee, so the load amplitude of bearing is high, simultaneously the gear wheel upper teeth operating principle that replaces fractured rock must cause drill bit axially or extensional vibration, and bearing load by a relatively large margin fluctuates.Cone bit bearing is in the work under bad environment of down-hole in addition, and the life-span of bearing seal is difficult to ensure, so the bearing life of tricone bit is relatively short.
The PDC drill bit is that a kind of composite polycrystal-diamond (be the PDC tooth, also be called for short tooth) that utilizes is cut scraping of rock or the drill bit of the broken rock of shear action.Owing to possessing outstanding superiority aspect cutting element performance and the broken rock mode, thus the PDC drill bit at soft efficiency of breaking rock to medium ground apparently higher than tricone bit.Now, the PDC drill bit uses more and morely in drilling engineering, and ratio is increasing, but for hardness, stratum and serious inhomogeneous stratum that abrasiveness is high, the PDC drill bit still is difficult to adapt to.Existing PDC drill bit all belongs to fixed cutter drill bits (movement-less part on the drill bit).For the PDC drill bit, under the identical condition of drill speed, the pressure of the drill, the efficiency of breaking rock of drill bit depends primarily on the ability of PDC tooth wedging rock, and the degree of depth of PDC tooth wedging rock is larger, and the drill bit efficiency of breaking rock is just higher.Usually, when soft formation crept into, the depth of tooth penetration of PDC Cutter was larger, and the efficiency of breaking rock of drill bit is higher; When hard formation crept into, the wedging ability of cutting teeth just died down, and depth of tooth penetration diminishes, and the drilling efficiency of drill bit just obviously reduces.The shortcoming that mainly contains of PDC drill bit is: the first, and when the intensity of rock or hardness were higher, the PDC tooth is difficult to the wedging rock to be cut to form effectively to scrape, and particularly after the PDC tooth had wearing and tearing, tooth was difficult to the wedging stratum more, and the rate of penetration of drill bit can sharply reduce.Second, the PDC tooth is rock cutting continuously, because violent fricative heat can make tooth reach 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 was higher than a certain specified temp, the phenomenon that its abrasion resistance obviously descends was called the thermal wear phenomenon of PDC tooth) of thermal wear phenomenon.The 3rd, the rate of wear difference of the PDC tooth on the different radial zones of PDC drill bit is obvious, the cutter-wear rate in general bit exterior zone (particularly outer 1/3 zone of drill bit radius) is obviously faster than the tooth in heart section zone, and the cutting teeth abrasion equilibrium is poor, thereby has reduced the combination property of drill bit.
Percussion bit is the fixed teeth rock crushing tool that cooperates down-the-hole air hammer (being down-hole hammer) to use in the rotary percussion drilling.The structure of percussion bit is similar to the PDC drill bit, does not have moveable element on the drill bit, the fixed cutting teeth that can cover zone to be broken, shaft bottom of some on the bit body.Difference mainly is: the cutting element of PDC drill bit is mainly the PDC tooth, and the cutting element of percussion bit is mainly the carbide alloy similar to the rock bit teeth patterning or the compound tooth of diamond.The crushing mechanism of the rock breaking mechanism of percussion bit and rock bit and the cutting scheme of PDC drill bit all have significant difference.Percussion bit relies on the instant impact realization of its tooth to the fragmentation of bottom rock.The upper end of percussion bit is connecting down-the-hole air hammer, down-the-hole air hammer is when work, its block stamp moves back and forth under the effect of circulation of fluid (drilling fluid or recyclegas), repeatedly clash into drill bit or bore bit, thereby for providing pulsatile impact load with the contacted drill teeth of bottom rock, rock occurs broken under the instant impact effect of tooth.Because the shock loading of drill bit depends on down-the-hole air hammer, so, (these characteristics and rock bit have remarkable difference not need to apply very large the pressure of the drill in the percussion bit course of work, rock bit must be depressed at wammel could obtain higher efficiency of breaking rock), only need with very little the pressure of the drill drill bit to be pressed in the shaft bottom and get final product.Generally, percussion bit can be obtained higher efficiency of breaking rock in brittle formation when particularly harder brittle formation is crept into.In addition, at the larger easily layer tiltedly of stratigraphic dip, adopt percussion bit to creep into and be conducive to reduce hole deviation trend.But because percussion bit is the fixed teeth drill bit, when having a small amount of cutting teeth to damage inefficacy, it is responsible for broken well bottom zone can't be broken, this will affect efficiency of breaking rock and the drilling ability of whole drill bit, the inefficacy meeting of a small amount of cutting teeth causes the infringement of bit body very soon, and then affects the application life of drill bit.
Southwest Petrol University proposes " a kind of wheel-type drill with the broken rock of cutting form " (number of patent application: 201010229375.7), the runner of this drill bit (is dise knife, claim again flywheel knife) have larger deviation angle (scope of deviation angle is 20 °～90 °), large deviation angle makes the cutting teeth on the drill bit runner slowly replace fractured rock to cut or to scrape the butt formula.The utility model flywheel knife deviation angle is larger, and when bit crept into, the wheel body speed ratio ratio of drill speed (the runner rotating speed with) was less, and the runner rotation slowly.The slow alternation of the cutting teeth of this drill bit, the drill bit initial failure that reduces or avoided fixed cutter drill bits to lose efficacy and bring because of the minority cutting teeth; Cutting teeth alternation even wearing, the ability to work of each cutting teeth can be fully used; The cutting teeth good cooling results is difficult for occuring thermal wear; The pressure of the drill required when drill bit creeps into is little, and the suffered load of bearing is little, and the load fluctuation amplitude is low, and bearing relatively rotates slowly, generates heat few, and the bearing life of drill bit is long.This drill bit still mainly relies on the pressure of the drill to make cutting teeth wedging stratum, the degree of depth of the larger PDC tooth of the pressure of the drill wedging rock is larger, and the drill bit efficiency of breaking rock is just higher, but the increase of the pressure of the drill is limited, and increase the wearing and tearing that the pressure of the drill can aggravate PDC tooth and bearing, reduce the working life of drill bit.In the creeping into of hard formation, this drill bit is because the cutting teeth depth of tooth penetration is little, and the drilling efficiency of drill bit is not high.
The utility model content
The purpose of this utility model is: a kind of dise knife composite drill bit is provided, increase the impact cutting structure on dise knife drill bit (or claiming wheel-type drill) basis, take full advantage of the advantage of rock fracture in dynamic indentation mode, promote Cutter to the wedging of rock, improve efficiency of breaking rock, slow down the rate of wear of cutting teeth, increase drilling life of bit, promote drill bit in the service behaviour of the more high bad ground of intensity.
The utility model purpose realizes by following technical proposals:
A kind of dise knife composite drill bit (abbreviation composite drill bit), comprise bit body and the dise knife cutting structure that is arranged on the bit body, be provided with the impact cutting structure on the composite drill bit, impacting cutting structure comprises the force transmission mechanism that transmits impact force and impacts cutting teeth, impact cutting teeth and be cemented on the drift of force transmission mechanism end, described drift can be done slip with respect to bit body or slide and impact on the impact force direction of transfer.
Particularly, the dise knife composite drill bit comprises bit body, the dise knife cutting structure, impact cutting structure and hydraulic structure, also can comprise the beater mechanism that produces impact force, impacting cutting structure comprises the force transmission mechanism that transmits impact force and impacts cutting teeth, force transmission mechanism comprises the anvil body that connects successively, dowel bar and drift, form relative sliding between anvil body and the bit body, form relative sliding between dowel bar and the bit body, or form and both allowed relative sliding by swinging slide block, allow again to connect in relative rotation, drift is connected to the end of dowel bar, impact cutting teeth and be cemented on the drift, drift can be done slip with respect to bit body or slide and impact on the impact force direction of transfer.Described bit body is to adhere to, supporting or receiving drill bit dise knife cutting structure, impact the matrix of cutting structure and beater mechanism, also is the matrix of nozzle being installed, being formed the drill bit runner.The upper end of bit body (also be the circulation of fluid arrival end, be called for short arrival end) is provided with to connect the screw thread of drill string.The top of bit body is tubular structure, and its tube wall had both had the function of transmitting the pressure of the drill, also plays effect pipe is interior, that the pipe external space is isolated, and its endoporus space is used for arranging the elements such as anvil body of force transmission mechanism, and beater mechanism also can be located therein.The bottom of bit body is mainly the matrix of dise knife cutting structure, has offered hole or groove in order to hold dowel bar on it, has also offered the circulation of fluid spray-hole.Except the extending part of drift, impact cutting teeth and dowel bar, the other parts of impacting cutting structure all are positioned at the inner space of bit body, and install from top to bottom according to the order of anvil body-dowel bar-drift.When composite drill bit comprised beater mechanism, top-down erection sequence was: beater mechanism-anvil body-dowel bar-drift, the impact force action that beater mechanism produces are passed to dowel bar, drift by the anvil body on the anvil body again.The upper surface of anvil body is the work plane of load of withstanding shocks, and the lower end is connected with dowel bar, can be to be slidingly connected, and also can be hinged (being chain connection), perhaps directly connects etc.When employing is slidingly connected, can be along the contact surface relative sliding between anvil body and the dowel bar; When adopting articulated manner to connect, can relatively rotate around hinged center between anvil body and the dowel bar.Drift is connected to the other end of dowel bar with modes such as screw thread, interference fit, pin, welding, or consists of an integral element with dowel bar.Drift, fixed impact cutting teeth and the dowel bar that matches thereon consist of one and impact cutting unit, impact the quantity of cutting unit and can only have one, also several can be arranged.In same impact cutting unit, the quantity of dowel bar is one or more than one, and when the quantity of dowel bar during more than one, each dowel bar is mutually connected in series, wherein has each other between the adjacent dowel bar of relative motion to be connected through the hinge.Between force transmission mechanism and the bit body and being connected or mounting means between each element of force transmission mechanism, make drift on the shock loading direction of transfer, do slip with respect to bit body.The dise knife cutting structure is arranged on the bit body bottom, includes the wheel palm and dise knife (also claiming runner), and the wheel palm is integrated with bit body is fixed, and dise knife is installed on the axle journal of the wheel palm, forms with the wheel palm to be rotationally connected, and is provided with the dise knife cutting teeth on the dise knife.Hydraulic structure mainly comprises inside and outside runner of drilling well circulatory mediator, and the nozzle that is installed in the inner flow passage exit.On drill bit, also be provided with some auxiliary elements, be included as the location centralizing cover that guarantees the correct operating position of anvil body and arrange, and be the elements such as the slide block realizing arranging being connected between anvil body and the dowel bar, bearing pin, and potted component etc.
One of key of the present utility model is: dise knife cutting structure and impact cutting structure combine and consist of the combined cut structure, impact cutting teeth on the drift constantly impacts the shaft bottom with certain frequency under impact force action, cooperation dise knife cutting structure is finished the fragmentation to bottom rock jointly.Arrangement and the quantity on bit body about dise knife cutting structure and impact cutting structure, those skilled in the art can have numerous selections in conjunction with prior art under the instruction of this manual, and these technical schemes are all within the utility model protection domain.
Two of key of the present utility model is: drift can be done slip with respect to bit body or slide and impact on the impact force direction of transfer.Resultant effect is: the first, and the pressure of the drill that is delivered on the bit body by drill string can not be applied on the impact cutting teeth, thereby has avoided impacting cutting teeth at the Fast Wearing that continues under large the pressure of the drill pressure holding; The second, the pulsatile impact load of impacting cutting structure can not be delivered on bit body and even the drill string, the adverse effect of having avoided pulsatile impact load may cause the safety of bit body and even drill string; The 3rd, help the realization of beater mechanism blank-run prevention function.About impacting the frame mode in order to realize that drift slides with respect to bit body on impact direction in the cutting structure; those skilled in the art can have numerous selections in conjunction with prior art under the instruction of this manual, these technical schemes are all within the utility model protection domain.
Dise knife cutting teeth on the described dise knife cutting structure is composite polycrystal-diamond, also can be TSP, natural diamond and impregnated with diamond cutting teeth, the impact cutting teeth that impacts on the cutting structure is hard-metal insert, or does the hard-metal insert that the surface is strengthened with diamond.Profile of tooth as the hard-metal insert that impacts cutting teeth can be hemi-spherical ended shape insert, blunt conical-ended shape insert, chisel teeth, wedge crested chisel insert and scoop chisel insert, also can be the tooth with other shape of good rock fracture in dynamic indentation effect.
The slide plane that matches with bit body at force transmission mechanism (mainly being dowel bar) arranges sealing device, avoid the erosion to dowel bar, bit body in the leakage process of the leakage of circulation of fluid and fluid, simultaneously, because circulation of fluid is higher than outside the bit body at the pressure of bit body inner chamber, the poor force transmission mechanism that acts on of external and internal pressure, generation is with the thrust of drift to extrapolation, and this thrust can make the cutting teeth on the drift press rock surface, is conducive to improve the rock fracture in dynamic indentation efficient of cutting teeth.
The impact cutting teeth of described impact cutting structure can be arranged within the radially coverage of described dise knife cutting structure dise knife cutting teeth, also can independently arrange the radially coverage overlaid of dise knife cutting structure dise knife cutting teeth (not with), or part is independent arranges.
As optimal way, the impact cutting teeth of described impact cutting structure and described dise knife cutting structure dise knife cutting teeth arrange that in radially overlapping covering the impact cutting teeth that impacts cutting structure is arranged within drill bit radius 1/3rd radial zone in addition.
As optimal way, the impact cutting teeth of described impact cutting structure and described dise knife cutting structure dise knife cutting teeth arrange that in radially overlapping covering the impact cutting teeth that impacts cutting structure is arranged within drill bit radius 1/2nd radial zone in addition.
As optimal way, the impact cutting teeth of described impact cutting structure and described dise knife cutting structure dise knife cutting teeth arrange that in radially overlapping covering the impact cutting teeth that impacts cutting structure is arranged within drill bit radius 2/3rds radial zone in addition.
As optimal way, the impact cutting teeth of described impact cutting structure is arranged in drill bit radius 1/3rd with within the interior radial zone.
Also can be provided with anti-rotation structure on the described force transmission mechanism, rotate around the dowel bar axle in the course of the work to avoid drift.
Also can be provided with anti-drop structure on the described force transmission mechanism, come off from drill bit under the extrapolability of drilling fluid, gravity etc. or pulling capacity effect to avoid drift and dowel bar.
As optimal way, the cutting teeth of described dise knife cutting structure adopts the PDC tooth, the carbide alloy tooth that the cutting teeth of described impact cutting structure adopts the carbide alloy tooth or strengthens with superhard materials such as diamonds.
As optimal way, the cutting teeth of described dise knife cutting structure adopts circular composite polycrystal-diamond, and the cutting teeth of described impact cutting structure adopts hard-metal insert or the diamond composite hard alloy tooth of conisphere shape or wedge shape.
As optimal way, when described composite drill bit comprised beater mechanism, bit body adopted split-type structural, beater mechanism and corresponding bit body part thereof can be separated from composite drill bit, consisted of independent parts.This moment, bit body was formed by connecting by the impactor body that is provided with beater mechanism and the cutting structure body that is provided with dise knife cutting structure and impact cutting structure, beater mechanism is installed in the hollow part of impactor body, and the impactor body is used for holding, installing beater mechanism.At this moment, composite drill bit just is divided into two on the function and make relatively independent part, the i.e. rock crushing tool of the impactor on top and bottom.The function of impactor just provides pulsatile impact power, and the function of rock crushing tool is transmitted impact force exactly, and implements direct fragmentation to rock with the dise knife cutting structure.Adopt split-type structural more to be conducive to manufacturing and the use of composite drill bit, impactor parts and rock crushing tool parts can be made respectively, enter to fit together before well uses again.
For the dise knife composite drill bit that comprises beater mechanism, its course of work is:
The dise knife composite drill bit is connected to the least significant end of drill string.Enter after the well, drill bit moves closer to, arrives the shaft bottom.(when circulation of fluid was drilling fluid, driving arrangement was borehole pump to start the circulation of fluid driving arrangement; When circulation of fluid be gas or when being mainly gas, driving arrangement is gas compressor), make circulation of fluid in the inside and outside circulation of drill string.Apply the pressure of the drill at drill bit, the beginning rotary drilling, the cutting teeth on the drill bit dise knife cutting structure namely begins broken bottom rock.Meanwhile, because circulation of fluid has begun circulation, under the driving of drill string inner loop fluid, beater mechanism is started working, apply continuously the pulsatile impact load of certain frequency scope to the anvil body, shock loading is passed to dowel bar by the anvil body, is passed to drift again, finally be applied to and impact on the cutting teeth, thereby realize impacting cutting structure to the fragmentation of bottom rock.After circulation of fluid flows through beater mechanism, flow out from bit port or nozzle by inner flow passage again, finish the cooling cutting teeth, clean drill bit, bottom-hole cleaning and cutting carring function.Although the broken rock work of dise knife cutting structure and impact cutting structure is carried out separately, rock breaking mechanism is also different, each other useful influencing each other can occur.Combined drill is usually take the dise knife cutting structure as the main cutting structure, and impacting cutting structure is the assisted machining structure.Cutting teeth in the dise knife cutting structure is generally PDC tooth (or take PDC tooth as main), so it (is wheel-type drill that the dise knife cutting structure on the composite drill bit just is equivalent to a common dise knife cutter drill bits, or pan of a steelyard cutter drill bit, flywheel knife drill bit), the key of its efficiency of breaking rock is that the PDC tooth is to the wedging effect of bottom rock.Increase the depth of tooth penetration of PDC tooth, usually can only increase the pressure of the drill, and the increase of the pressure of the drill is limited, and increase the wearing and tearing that the pressure of the drill can aggravate PDC tooth and bearing, reduce the working life of drill bit.The essence of technical solutions of the utility model is exactly to introduce in the dise knife cutter drill bits to impact cutting structure, this technical scheme can effectively be utilized the characteristics and advantages of rock fracture in dynamic indentation mode, promotes significantly efficiency of breaking rock and the cutting teeth working life of dise knife cutting structure.Impact cutting structure and rely on the impact cutting teeth to the pulsatile impact load fractured rock of the certain frequency of rock, therefore very low to the requirement of work the pressure of the drill, cutting teeth is that the hole is cheated or is pressed in the fragmentation that the respective regions in the shaft bottom forms one by one to the impact effect of bottom rock, these broken generations of cheating or being pressed into the hole have directly promoted the wedging of dise knife cutting structure respective regions PDC tooth to bottom rock, have alleviated simultaneously the live load of these PDC teeth.In other words, when the cutting teeth of dise knife cutting structure creeps in the scraggly shaft bottom with many broken holes, its rate of penetration will be apparently higher than the rate of penetration at the bottom of without broken mine pit, and the rate of wear of its cutting teeth is starkly lower than the rate of wear when creeping at the bottom of without broken mine pit.
In the impact cutting structure of composite drill bit, impact each element (comprising anvil body, dowel bar, drift and cutting teeth etc.) that bears pulsatile impact load in the cutting structure and can on the shock loading direction of transfer, do slip or the impact of sliding with respect to bit body.Like this, in the normal drilling process of drill bit, impact cutting structure and do not bear the pressure of the drill from drill string and bit body, also the do not withstand shocks pulsatile impact load of cutting structure of dise knife cutting structure.These characteristics both can avoid pulsatile impact load to damage or the adverse effect of dise knife cutting structure cutting teeth, bearing, bit body and even upper drilling string, also can avoid impacting cutting teeth because continuing to bear the Fast Wearing that large work the pressure of the drill causes.In addition, these characteristics also provide necessary condition for the blank-run prevention function that realizes composite drill bit.Being lowered in the process of drill bit; because the effect of gravity and circulation of fluid inside and outside differential pressure; impact anvil body, dowel bar, the drift in the cutting structure and impact together down sliding one segment distance of cutting teeth; the impact cutting teeth is protruded from outside the dise knife cutting structure cutting teeth envelope contour face; impact the residing position of cutting structure this moment is the blank-run prevention position; on this position; the design of the blank-run prevention of beater mechanism can make the impact hammer in the beater mechanism stop hammering to the anvil body, to realize the no-load protection of impact cutting structure.Move closer at drill bit, when arriving the shaft bottom, outstanding impact cutting teeth at first contacts the shaft bottom, further in place along with drill bit then, the said elements that impacts in the cutting structure is retracted to normal operation position gradually.When drill bit after the shaft bottom is fully in place, drill bit begins rotary drilling, impacts cutting structure and dise knife cutting structure and begins to break normally rock work.When carrying drill bit on the needs when (as pulling out of hole or the continued access drill string), gradually rising along with bit location, opposite with going down process, dise knife cutting structure on the drill bit at first leaves the shaft bottom, still keeps contacting with bottom rock and impact cutting teeth, simultaneously, impact the downward slippage of the relative bit body of aforementioned other related elements in the cutting structure until arrive the blank-run prevention position, after this impact the cutting teeth load that no longer withstands shocks, then break away from the shaft bottom, rise with the drill bit other parts.
For the dise knife composite drill bit that does not comprise beater mechanism, the course of work that produces pulsatile impact load is no longer finished by composite drill bit, finishes and change by impactor.In addition, all the other courses of work are identical with the course of work of the dise knife composite drill bit that comprises beater mechanism.The dise knife composite drill bit that does not comprise beater mechanism is not the drill bit of a telotism, must with the use of just going into the well after the supporting installation of corresponding impactor.In fact the composite drill bit of this moment is exactly the rock crushing tool parts of split type dise knife composite drill bit.When concrete the use, generally should first supporting impactor and composite drill bit be linked together (impactor is connected on the composite drill bit), and then impactor, the composite drill bit that combines be connected to the drill string end.After installing, the use of can going into the well.
The beneficial effects of the utility model:
(1) when composite drill bit during in the shaft bottom rotary drilling, in dise knife cutting teeth and the well bottom zone of impacting the overlapping covering of cutting teeth, owing to impact cutting teeth to the continuous impact of rock, the surface, shaft bottom has formed and has been pressed into hole or broken hole.Under the identical condition of cutting depth (depth of tooth penetration) or ablation volume (being cut the fragmented rock volume), wedging power (perpendicular to the pressing-in force of rock surface), main cutting force (at cutting force cutting speed direction on) and the cutting power of PDC tooth when having formed the rock surface cutting that is pressed into hole or broken hole is starkly lower than the working angles under rock surface opposed flattened (the not having broken hole) condition, the difficulty of cutting teeth wedging rock obviously reduces, and broken rock energy consumption also obviously reduces.So, to compare with wheel-type drill, composite drill bit can reach higher efficiency of breaking rock on the stratum (stratum that hardness is higher) that cutting teeth is difficult to wedging when creeping into.
(2) as previously mentioned, under the identical condition of cutting depth or ablation volume, the friction power loss of PDC tooth when the rock surface cutting that broken hole is arranged is starkly lower than the working angles under rock surface opposed flattened (the not having broken hole) condition, and the heat that produces owing to friction also obviously reduces.On the other hand, when the rock surface cutting that broken hole is arranged, frequent variations can occur in the contact area between cutting teeth and the rock and contact condition, and the cooling effect of cutting teeth can improve.So, compare with wheel-type drill, the cutter-wear rate of composite drill bit dise knife cutting structure is lower, can reach higher working life, thereby when the bad grounds such as high abrasive, high rigidity and high inhomogeneity that wheel-type drill is difficult to adapt to used, composite drill bit can reach better drilling effect.
(3) force transmission mechanism in the composite drill bit can be done slip with respect to bit body on the shock loading direction of transfer, resultant beneficial effect is: first, the pressure of the drill that is delivered on the bit body by drill string can not be applied on the impact cutting teeth, thereby has avoided impacting cutting teeth at the Fast Wearing that continues under large the pressure of the drill pressure holding; Second, the pulsatile impact load of impacting cutting structure can not be delivered on bit body and even the drill string, the do not withstand shocks pulsatile impact load of cutting structure of dise knife cutting structure, this can be avoided pulsatile impact load to damage or the adverse effect of dise knife cutting structure cutting teeth, bearing, bit body and even upper drilling string; The 3rd, help the realization of beater mechanism blank-run prevention function.
(4) centre of dise knife cutter drill bits has an inner cone zone usually, composite drill bit can impact cutting structure at this region division, easier generation volumetric fracture under the impact force action that impacts cutting teeth at the bottom of the tapered well of protuberance, the catalase speed in centre, shaft bottom is significantly accelerated, thereby promotes the raising of drill bit efficiency of breaking rock.
(5) can cover all composite drill bits of (or approaching all) radial zone of shaft bottom for the dise knife cutting structure, when beater mechanism or impact cutting structure because a variety of causes causes losing efficacy or during inefficiency, the dise knife cutting structure still can work alone.These characteristics of composite drill bit are better than conventional percussion bit.
Description of drawings
Fig. 1 is structural representation of the present utility model, and composite drill bit does not comprise beater mechanism among the figure, has 2 runners, and 2 covers impact cutting unit, the alternate layout of runner and drift.
Fig. 2 is composite drill bit shown in Figure 1 view (top view) when seeing from the cutting structure end to tip side.
Fig. 3 does the impact cutting structure cross-sectional schematic of part after dissecing to composite drill bit shown in Figure 1.
Fig. 4 is the decomposing schematic representation (for showing the relation of installation, bit body 1 having been carried out horizontal subdivision from the middle part) to composite drill bit shown in Figure 1.
Fig. 5 is the structural principle schematic diagram that is provided with anvil body supporting positive cover between anvil body of the present utility model and the bit body, and supporting positive cover plays the righting location to the anvil body.
Fig. 6 is the righting positioning principle schematic diagram (anvil body 323 with the endoporus hole wall of bit body 1 contact, form matched in clearance, realize the righting location of anvil body) of the utility model anvil body during without supporting positive cover.
Fig. 7 is the composite drill bit drape tooth figure radially when impacting cutting teeth and being arranged in zone beyond the drill bit radius 1/3rd.
Fig. 8 is the composite drill bit drape tooth figure radially when impacting cutting teeth and being arranged in zone beyond the drill bit radius 1/2nd.
Fig. 9 is the composite drill bit drape tooth figure radially when impacting cutting teeth and being arranged in drill bit radius 2/3rds with exterior domain.
Figure 10 is the composite drill bit drape tooth figure radially when impacting cutting teeth and being arranged in drill bit radius 1/3rd with inner region.
Figure 11 is the composite drill bit drape tooth figure radially when impacting cutting teeth and being arranged in whole radial extension except bit central and zone such as fraction such as grade, rule footpath.
Figure 12 is that the utility model composite drill bit has 3 wheel discs and 1 cover impacts cutting unit, and the top view when impacting cutting unit and being arranged in drill bit heart section.
Figure 13 is the force transmission mechanism principle schematic of structure shown in Figure 1, and in this force transmission mechanism, drift is fixedly connected with dowel bar, and dowel bar and anvil body form and be slidingly connected (sliding pair).
Figure 14 is the principle schematic of a kind of force transmission mechanism of the present utility model, in this force transmission mechanism, impact in the cutting unit 2 dowel bars are arranged, one of them dowel bar (one) is fixedly connected with (or being the integral type structure) with drift, another dowel bar (two) is connected (formation revolute pair) by hinge with the anvil body, between 2 dowel bars also by hinge be connected (formation revolute pair).
Figure 15 is the principle schematic of a kind of force transmission mechanism of the present utility model, in this force transmission mechanism, drift is fixedly connected with dowel bar, dowel bar and anvil body are connected through the hinge, be provided with the swing slide block between dowel bar and the bit body, it is hinged to swing slide block and dowel bar, swinging slide block and bit body is slidingly connected, be to have formed and both allow relative sliding by swinging slide block between dowel bar and the bit body, allow again to connect in relative rotation, dowel bar both can slide by relative bit body with drift, also can rotate around the center of rotation that swings slide block.
Figure 16 is provided with the swing slide block between the dowel bar of force transmission mechanism shown in Figure 15 and the bit body, and it is hinged with dowel bar to swing slide block, the structural representation when swing slide block and bit body are slidingly connected.
Figure 17 is the principle schematic of a kind of force transmission mechanism of the present utility model, in this force transmission mechanism, drift is fixedly connected with dowel bar, dowel bar and anvil body are connected through the hinge, be provided with the swing slide block between dowel bar and the bit body, swing slide block and dowel bar and be slidingly connected, it is hinged to swing slide block and bit body, dowel bar both can slide by relative bit body with drift, also can rotate around the center of rotation that swings slide block.
Figure 18 is the structural representation of a kind of force transmission mechanism of the present utility model, and in this force transmission mechanism, drive link and drift are fixed, and the impact direction that impacts cutting structure is parallel to the drill axis direction.
Figure 19 is impact cutting teeth of the present utility model schematic diagram when adopting diamond to do the hard-metal insert of strengthening on the surface.
Figure 20 comprises beater mechanism, and the composite drill bit structural representation when adopting integral structure.
Figure 21 comprises beater mechanism, and adopts the composite drill bit structural representation of split-type structural.
Figure 22 is for preventing that drift and dowel bar from rotating, the structural concept schematic diagram when adopting spline joint between dowel bar and bit body.
Figure 23 is for preventing coming off of drift and dowel bar etc., the structural concept schematic diagram when dowel bar and bit body are provided with the slip-off preventing step.
Figure 24 is the structural representation of composite drill bit when being in the blank-run prevention position.
Wherein: 1, bit body, 12, bit body slip-off preventing step, 2, the dise knife cutting structure, 21, the dise knife cutting teeth, 22, runner, 3, impact cutting structure, 31, impact cutting teeth, 311, carbide alloy, 312, the diamond enhancement Layer, 32, force transmission mechanism, 321, drift, 322, dowel bar, 323, the anvil body, 324, supporting positive cover, 325, sealing ring, 328, swing slide block, 3221, dowel bar (one), 3222, dowel bar (two), 3223, dowel bar slip-off preventing step, 33, beater mechanism, 331, block stamp, 41, runner, 42, nozzle, 5, the impactor parts, 51, the impactor body, 52, the impactor block stamp, 6, the cutting structure parts, 61, the cutting structure body.
The specific embodiment
Following non-limiting examples is used for explanation the utility model.
Embodiment 1:
Such as Fig. 1 to Fig. 4, Fig. 7, Figure 13 and shown in Figure 19, a kind of dise knife composite drill bit, comprise bit body 1, bit body 1 is provided with dise knife cutting structure 2, the hydraulic structure that impacts cutting structure 3 and formed by runner 41 and nozzle 42, dise knife cutting structure 2 includes dise knife cutting teeth 21, impacting cutting structure 3 comprises the force transmission mechanism 32 that transmits impact force and impacts cutting teeth 31, force transmission mechanism 32 comprises drift 321, dowel bar 322 and anvil body 323, impact cutting teeth 31 and be cemented on the drift 321 of force transmission mechanism 32 ends, drift 321 can be done slip with respect to bit body 1 on the impact force direction of transfer.Composite drill bit does not comprise beater mechanism, has 2 runners, and 2 covers impact cutting unit, runner 22 and drift 321 alternate layouts.Be provided with sealing device (such as the sealing ring 325 between dowel bar among Fig. 3 322 and the bit body 1) between bit body 1 and the force transmission mechanism 32.Dise knife cutting teeth 21 can be composite polycrystal-diamond, TSP tooth, natural diamond tooth, impregnated with diamond tooth.The impact cutting teeth 31 that impacts on the cutting structure 3 is hard-metal insert, or does the hard-metal insert that the surface is strengthened with diamond.Composite polycrystal-diamond, TSP tooth, natural diamond tooth and impregnated with diamond tooth all have fabulous abrasion resistance, usually be applied on the stationary cutting structure drill bit, wherein for TSP tooth, natural diamond tooth and impregnated with diamond tooth, because characteristics and the restriction of material structure own, its application conditions normally adopts high cutter set density to be arranged on the stationary cutting structure bit body.Because cutter set density is high, cutting teeth wedging depth of stratum is limited, and fixedly cutting teeth often is difficult to effectively scrape and cuts the broken rock in stratum, even creeps into the broken rock of the extremely low lapping mode of efficient, and therefore generally these three kinds of teeth effect of being applied to wheel-type drill is unsatisfactory.And the utility model combines dise knife cutting structure 2 with impact cutting structure 3, under the percussion of impacting cutting teeth 31, make the shaft bottom form rough broken hole, the wedging that can help dise knife cutting teeth 21, the quantity of the cutting teeth synchronization contact bottom rock on the dise knife cutting structure 2 is generally few simultaneously, the cutting teeth density that namely participates in simultaneously broken rock is not high, the pressure of the drill that single tooth is shared is larger, cutting teeth is larger to the pressing-in force on stratum, be easy to the wedging stratum, therefore, these three kinds of teeth also can be obtained good effect in the utility model; Simultaneously, the cutting teeth that above-mentioned abrasion resistance is good is applied on the dise knife cutting structure 2 of composite drill bit, preferably rock breaking efficiency and drilling life of bit can be obtained, drill bit can be widened again in the scope of application of the bad grounds such as high abrasive, high rigidity and high inhomogeneity.As shown in figure 19, the impact cutting teeth 31 on the drift 321 adopts diamond to do the hard-metal insert that the surface is strengthened, and the abrasion resistance that diamond strengthens obviously improving cutting teeth is done on the surface of hard-metal insert.The profile of tooth of impacting cutting teeth 31 can be blunt conical-ended shape insert, chisel teeth, hemi-spherical ended shape insert, wedge crested chisel insert and scoop chisel insert, also can be the tooth with other shape of good rock fracture in dynamic indentation effect.The impact cutting teeth 31 that impacts cutting structure 3 can be arranged within the radially coverage of dise knife cutting teeth 21 of dise knife cutting structure 2, also can independently arrange the radially coverage overlaid of dise knife cutting structure cutting teeth (not with), or part is independent arranges.As preferably, impact cutting teeth 31 and arrange in radially overlapping covering with dise knife cutting teeth 21, the cutting teeth that impacts cutting structure 3 is arranged within drill bit radius 1/3rd radial extension in addition (as shown in Figure 7).Generally, the broken task amount in drill bit heart section zone is less and be easy to fragmentation, and heart section is relatively large with the broken task amount of exterior domain, the cutting teeth wearing and tearing want fast than heart section, therefore, arrange that with exterior domain impacting cutting teeth is conducive to the fragmentation of corresponding region rock in heart section, and slow down the wearing and tearing of dise knife cutting teeth.Drift 321 on the impact cutting structure 3 is mutually fixed with dowel bar 322 to be a fixing integral body, and dowel bar 322 and anvil body 323 are slidingly connected (mechanism principle figure as shown in figure 13).
Embodiment 2:
Present embodiment is substantially the same manner as Example 1, its difference is: it is shown in Figure 5 to be provided with anvil body supporting positive cover 324(between anvil body 323 and the bit body 1), or directly process the surface that forms matched in clearance with bit body 1 endoporus on the anvil body 323, realize relative sliding and righting location (as shown in Figure 6) between anvil body and bit body.
Embodiment 3:
Present embodiment and above-described embodiment are basic identical, its difference is: certain or each impact that dowel bar has two in the cutting unit, the characteristics of motion of two dowel bars is different, has each other relative motion, one of them dowel bar (one) 3221 is fixedly connected with drift 321, another dowel bar (two) 3222 is hinged with anvil body 323, is connected through the hinge (as shown in figure 14) between two dowel bars.When drift 321 from bit central away from and its impact direction and drill axis angle when larger, adopt two dowel bars that are hinged to be easier to realize the transformation of impact direction and the transmission of impact force.
Embodiment 4:
Present embodiment and above-described embodiment are basic identical, and its difference is: the impact cutting teeth 31 that impacts cutting structure 3 is arranged within drill bit radius 1/2nd radial extension in addition (as shown in Figure 8).
Embodiment 5:
Present embodiment is substantially the same manner as Example 4, and its difference is: the impact cutting teeth 31 that impacts cutting structure 3 is arranged within drill bit radius 2/3rds radial extension in addition (as shown in Figure 9).Generally, the live load (the broken rock amount of on average bearing that refers to cutting teeth) of (the particularly zone beyond the drill bit radius 2/3rds) cutting teeth is larger more outward on the drill bit radius region, the wearing and tearing of cutting teeth or rate of decay are got over the tooth faster than heart section zone, arrange the impact cutting teeth in this zone, can also reduce its rate of decay when this zone dise knife cutter breaking rock efficient is improved, thereby prolong the application life of Cutter.
Embodiment 6:
Present embodiment and above-described embodiment are basic identical, and its difference is: the impact cutting teeth 31 that impacts cutting structure 3 is arranged in drill bit radius 1/3rd with (such as Figure 10 and shown in Figure 12) within the interior radial extension.The centre of drill bit has an inner cone zone usually, when in the large stratum of the high fragility of hardness, creeping into, impact cutting teeth near drill bit heart section region division, under the percussion of impacting cutting teeth, be easier to the brittle crush (being volumetric fracture) of heart section rock, be conducive to improve the drill bit drilling efficiency.
Embodiment 7:
Present embodiment and above-described embodiment are basic identical, and its difference is: the impact cutting teeth 31 that impacts cutting structure 3 is arranged in the whole radial extension except bit central and zone such as fraction such as grade, rule footpath (as shown in figure 11).In the bad ground high in intensity, that plasticity is large, all be furnished with the impact cutting teeth in the whole radial extension of drill bit, can in whole radial zone, strengthen the rock breaking capacity of drill bit, improve the efficiency of breaking rock of composite drill bit in this kind bad ground.
Embodiment 8:
Present embodiment and above-described embodiment are basic identical, its difference is: drift 321 is fixedly connected with dowel bar 322, dowel bar 322 and anvil body 323 chain connections, be provided with between dowel bar 322 and the bit body 1 and swing slide block 328, it is hinged with dowel bar 322 to swing slide block 328, swing slide block 328 and bit body 1 be slidingly connected (such as Figure 15 and shown in Figure 16), be to have formed and both allow relative sliding by swinging sliding 328 between dowel bar 322 and the bit body 1, allow again to connect in relative rotation, dowel bar 322 both can slide by relative bit body 1 with drift 321, also can rotate around the center of rotation that swings slide block 328.When the impact direction of drift 321 and drill bit shaft were larger to angle, the introducing that swings slide block 328 can make the transmission of impact force more smooth and easy.
Embodiment 9:
Present embodiment is substantially the same manner as Example 8, its difference is: as shown in figure 17, swinging slide block 328 is slidingly connected with dowel bar 322, it is hinged with bit body 1 to swing slide block 328, dowel bar 322 both can slide by relative bit body 1 with drift 321, also can rotate around the center of rotation that swings slide block 328.The effect of present embodiment is substantially the same manner as Example 8.
Embodiment 10:
In the present embodiment, the impact direction of described impact cutting structure is parallel to the drill axis direction.As shown in figure 18, with this understanding, transmission mechanism 32 need not labyrinth, only needs dowel bar 322 fixed drifts 321 to get final product.Other technologies scheme those skilled in the art can be under feasible prerequisite independent assortment in the manual technical scheme or other embodiment.
Embodiment 11:
Present embodiment and above-described embodiment are basic identical, and its difference is: composite drill bit comprises beater mechanism 33, and beater mechanism 33 is integral type structure (as shown in figure 20) with bit body.The impact force that beater mechanism 33 produces during drill bit work acts on the anvil body 323 of force transmission mechanism 32 by the block stamp 331 on the beater mechanism 33.Integral structure makes that the composite drill bit internal construction is compacter, reliability is higher.
Embodiment 12:
Present embodiment is substantially the same manner as Example 11, its difference is: bit body 1 adopts split-type structural, be formed by connecting by the impactor body 51 that is provided with beater mechanism and the cutting structure body 61 that is provided with dise knife cutting structure 2 and impact cutting structure 3, the hollow part that beater mechanism is installed in impactor body 51 forms impactor parts 5, and dise knife structure 2, impact cutting structure 3 and cutting structure body 61 consist of cutting structure parts 6(as shown in figure 21).The impact force that impactor parts 5 produce during drill bit work acts on the anvil body 323 of force transmission mechanism by the upper block stamp 52 of beater mechanism.Adopt split-type structural to be conducive to manufacturing and the use of composite drill bit, impactor parts and rock crushing tool parts can be made respectively, enter to fit together before well uses again.
Embodiment 13:
In the present embodiment, for preventing the rotation of drill bit when work dowel bar 322 and drift 321 etc., between drift 321 and the bit body 1 or (and) be provided with anti-rotation structure between dowel bar 322 and the bit body 1.As shown in figure 22, between dowel bar 322 and the bit body 1 spline joint is set, rotates around the dowel bar axle in the course of the work to avoid dowel bar 322 and drift 321 etc.
Embodiment 14:
In the present embodiment, for preventing coming off of dowel bar 322 and drift 321 etc., between drift 321 and the bit body 1 or (and) be provided with anti-drop structure between dowel bar 322 and the bit body 1.As shown in figure 23, be respectively arranged with slip-off preventing step 3223 and 12 at dowel bar 322 and bit body 1, come off from drill bit under the pulling capacity effect in order to avoid dowel bar 322 and drift 321 etc.
Embodiment 15:
In the present embodiment, for prevent that drill bit is lowered in the process or on block stamp is to the hammering of anvil body 323 when carrying drill bit, composite drill bit is provided with the blank-run prevention structure.As shown in figure 24, when drill bit does not contact the shaft bottom, because the effect of gravity and circulation of fluid inside and outside differential pressure, impact anvil body 323, dowel bar 322, the drift 321 in the cutting structure 3 and impact together down sliding one segment distance of cutting teeth 31, impact cutting teeth 31 is protruded from outside the envelope contour face of dise knife cutting structure cutting teeth 21, and impact cutting structure 3 residing positions this moment is the blank-run prevention position.On this position, the blank-run prevention of beater mechanism design can make the jump bit in the beater mechanism stop hammering to the anvil body, to realize the no-load protection of impact cutting structure.。
The above only is preferred embodiment of the present utility model; not in order to limit the utility model; all any modifications of within spirit of the present utility model and principle, doing, be equal to and replace and improvement etc., all should be included within the protection domain of the present utility model.
Claims (10)
1. dise knife composite drill bit, comprise bit body (1) and be arranged on dise knife cutting structure (2) on the bit body (1), it is characterized in that: described bit body (1) also is provided with and impacts cutting structure (3), impacting cutting structure (3) comprises the force transmission mechanism (32) that transmits impact force and impacts cutting teeth (31), impact cutting teeth (31) and be cemented on the terminal drift (321) of force transmission mechanism (32), described drift (321) can be done slip with respect to bit body (1) or slide and impact on the impact force direction of transfer.
2. a kind of dise knife composite drill bit according to claim 1 is characterized in that: described bit body (1) also is provided with the beater mechanism (33) that produces impact force and transmitted impact force by described force transmission mechanism (32).
3. a kind of dise knife composite drill bit according to claim 2, it is characterized in that: described bit body (1) adopts split-type structural, be formed by connecting by the impactor body (51) that is provided with described beater mechanism and the cutting structure body (61) that is provided with described dise knife cutting structure (2) and impacts cutting structure (3), beater mechanism is installed in the hollow part of impactor body (51).
According to claim 1 with 2 or 3 described a kind of dise knife composite drill bits, it is characterized in that: be furnished with described impact cutting teeth (31) in the radial zone beyond the drill bit radius 1/3rd.
According to claim 1 with 2 or 3 described a kind of dise knife composite drill bits, it is characterized in that: be furnished with described impact cutting teeth (31) in the radial zone beyond the drill bit radius 1/2nd.
According to claim 1 with 2 or 3 described a kind of dise knife composite drill bits, it is characterized in that: be furnished with described impact cutting teeth (31) in the radial zone beyond the drill bit radius 2/3rds.
According to claim 1 with 2 or 3 described a kind of dise knife composite drill bits, it is characterized in that: drill bit radius 1/3rd is to be furnished with described impact cutting teeth (31) in the interior radial zone.
According to claim 1 with 2 or 3 described a kind of dise knife composite drill bits, it is characterized in that: described force transmission mechanism (32) comprises the anvil body (323) that connects successively, dowel bar (322) and drift (321), form relative sliding between anvil body (323) and the bit body (1), form relative sliding between dowel bar (322) and the bit body (1), or form and both allowed relative sliding by swinging slide block (328), allow again to connect in relative rotation, described drift (321) is connected to the end of dowel bar (322), or consists of an integral element with dowel bar (322).
9. a kind of dise knife composite drill bit according to claim 8, it is characterized in that: in same impact cutting unit, the quantity of dowel bar is one or more than one, when the quantity of dowel bar during more than one, each dowel bar is mutually connected in series, wherein has each other between the adjacent dowel bar of relative motion to be connected through the hinge.
10. according to claim 1 and 2 or 3 described a kind of dise knife composite drill bits, it is characterized in that: the dise knife cutting teeth (21) on the described dise knife cutting structure (2) is composite polycrystal-diamond, also can be TSP, natural diamond and impregnated with diamond cutting teeth, the impact cutting teeth (31) that impacts on the cutting structure (3) is hard-metal insert, or does the hard-metal insert that the surface is strengthened with diamond.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220225374 CN202659148U (en) | 2012-05-18 | 2012-05-18 | Disc-cutter compound drill bit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220225374 CN202659148U (en) | 2012-05-18 | 2012-05-18 | Disc-cutter compound drill bit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202659148U true CN202659148U (en) | 2013-01-09 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220225374 Expired - Lifetime CN202659148U (en) | 2012-05-18 | 2012-05-18 | Disc-cutter compound drill bit |
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| Country | Link |
|---|---|
| CN (1) | CN202659148U (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102678052A (en) * | 2012-05-18 | 2012-09-19 | 西南石油大学 | Disc cutter composite drill bit |
| WO2013170788A1 (en) * | 2012-05-18 | 2013-11-21 | 西南石油大学 | Combination scraping and impacting drill bit |
| CN108868625A (en) * | 2017-05-12 | 2018-11-23 | 西南石油大学 | A kind of combined cut diamond bit |
| CN111411897A (en) * | 2020-05-28 | 2020-07-14 | 西南石油大学 | Punching PDC drill bit |
-
2012
- 2012-05-18 CN CN 201220225374 patent/CN202659148U/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102678052A (en) * | 2012-05-18 | 2012-09-19 | 西南石油大学 | Disc cutter composite drill bit |
| WO2013170788A1 (en) * | 2012-05-18 | 2013-11-21 | 西南石油大学 | Combination scraping and impacting drill bit |
| CN108868625A (en) * | 2017-05-12 | 2018-11-23 | 西南石油大学 | A kind of combined cut diamond bit |
| CN111411897A (en) * | 2020-05-28 | 2020-07-14 | 西南石油大学 | Punching PDC drill bit |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
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Granted publication date: 20130109 |