CN2475815Y - A hydraulic structure for tri-cone rotary drill bit - Google Patents
A hydraulic structure for tri-cone rotary drill bit Download PDFInfo
- Publication number
- CN2475815Y CN2475815Y CN 01239801 CN01239801U CN2475815Y CN 2475815 Y CN2475815 Y CN 2475815Y CN 01239801 CN01239801 CN 01239801 CN 01239801 U CN01239801 U CN 01239801U CN 2475815 Y CN2475815 Y CN 2475815Y
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- bit
- central nozzle
- hydraulic structure
- pilot jet
- nozzle
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Abstract
The utility model relates to a cone bit, particularly a hydraulic structure for a tri-cone bit, which comprises three cone legs. The upper parts of the three cone legs are combined into a whole, the lower end of each cone leg is provided with a cone, and the middle part of the lower part of a bit body is provided with a center nozzle. The utility model is characterized in that the periphery of the bit body between the cone legs is provided with a wiper block which is provided with a reverse edge nozzle with an upward jet hole. An auxiliary nozzle can also be arranged along the circumferential direction of the center nozzle. The utility model can effectively improve a flow field at the bottom of a well and enhance the rock removing effect of main jet in order to enhance the speed rate of a well drilling to reduce the integrated cost of the well drilling.
Description
The utility model relates to a kind of rock bit that is used for oil and geological drilling, relates to the Hydraulic Power System structure of tricone bit particularly.
Existing tricone bit comprises the bit leg that three upper group are welded into one, and every bit leg bottom is installed on a gear wheel, and Monday, side was provided with the downward limit nozzle of jet hole outside the middle part of every bit leg, with the hydraulic structure as drill bit.The tricone bit of this hydraulic structure is that jet expansion is far away to the distance in shaft bottom on the one hand, and up liquid stream and descending mutual interference have mutually consumed a large amount of jet energy; Be that three strands of impinging jets are behind the shaft bottom, in three cross flow districts of shaft bottom formation, the mutual interference of each burst cross flow phase on the other hand, not only form the stagnant area in the shaft bottom, also can reduce the speed of cross flow mutually, so the effect of bottom-hole cleaning is relatively poor, and influences the Drilling performance and the efficient of drill bit.For solving the defective that exists on the above-mentioned hydraulic structure, proposed extended jet nozzle and shortened the technical scheme of nozzle bore to bottom hole spacing; In addition, proposed the low nozzle carrier hydraulic structure of dual channel in the Chinese patent 952211688, shortened the distance of jet expansion on the one hand, made the shaft bottom form asymmetric flow field on the other hand to the shaft bottom, but these structures all fail thoroughly to eliminate the stagnant area of shaft bottom cross flow layer.In order effectively to improve the stagnant area that the shaft bottom exists, designed the hydraulic structure that central nozzle adds 1-2 limit nozzle in the U.S. Pat 05853055, and have three side openings at central nozzle outlet lengthening section, the jet of side opening is used to clean gear wheel, mix at the discharge capacity branch, the central nozzle discharge capacity accounts for more than 75% of total displacement, the weak point of this rock bit hydraulic structure is: one, limit nozzle discharge capacity diminishes, its jet will be depleted before reaching the shaft bottom, this had not both reached rock purpose clearly, also can upset bottom-hole flow field; Its two, three side openings of central nozzle directly communicate with the center sprue, its effluxvelocity is higher, is directly injected to the erosion that easily causes on the gear wheel gear wheel.
The purpose of this utility model is to overcome the deficiency that above-mentioned prior art exists and a kind of hydraulic structure of tricone bit is provided, and it can effectively improve bottom-hole flow field, improves the large rock-clearing effect of power stream, thereby effectively improves the bit speed of tricone bit.
The purpose of this utility model is realized by following technical scheme: include three bit legs 1, the upper junction integrator of three bit legs, the lower end of every bit leg is installed on gear wheel 2, the middle part, lower end of bit body is provided with central nozzle 4, its difference is that the bit body periphery between each sheet bit leg is installed on wiper block 5, and wiper block is provided with spray orifice reverse edge nozzle 7 up.
Press such scheme, can central nozzle 4 pilot jet 16 circumferentially is set, pilot jet is connected with sprue by the decompression auxiliary flow; On the outer peripheral face of described wiper block, be provided with wear-resisting gauge teeth 6.
The central nozzle of drill bit ejected slurry jet at a high speed when main feature of the present utility model was to use, directly strike the shaft bottom core 8 of projection, under the guide functions of shaft bottom projection core to around diffusion, form the high speed cross flow, the shaft bottom landwaste leaves the shaft bottom under the shear action of high speed cross flow, move upward with drilling fluid, and the reverse edge nozzle is used to regulate the discharge capacity of mud on the one hand, its jet can be given birth to draw to returning the liquid miscarriage on the shaft bottom on the other hand, make the annular space that returns in its acceleration between the drill string and the borehole wall, this has not only eliminated the stagnant area of shaft bottom cross flow layer, improved bottom-hole flow field, also can reduce up liquid stream and the mutual interference mutually between the jet downwards to greatest extent, the large rock-clearing effect of jet is effectively improved.Secondly, the utility model circumferentially is provided with pilot jet at central nozzle, pilot jet produces the jet of rotation diffusion by the decompression auxiliary flow, can play the good result of cleaning and cooling off gear wheel, therefore, by adopting the utility model can effectively improve the drilling well speed of tricone bit, prolong drilling life of bit, reduce the integrated cost of drilling well.
Fig. 1 is elevation and the bottom-hole flow field schematic diagram of an embodiment of the utility model.
Fig. 2 is the oblique view of an embodiment of the utility model.
Fig. 3 is the upward view of an embodiment of the utility model.
Fig. 4 is the stereogram of central nozzle seat and central nozzle among embodiment of the utility model.
Fig. 5 is the full sectional view of central nozzle seat and central nozzle among Fig. 4.
Fig. 6 is the stereogram of central nozzle and pilot jet structure.
Fig. 7 is the stereogram of pilot jet cover.
Fig. 8 is the stereogram of central nozzle and decompression auxiliary flow.
Fig. 9 is the oblique vertical view of an embodiment of the utility model.
Figure 10 is the amplification stereogram of wiper block.
Further specify embodiment of the present utility model below in conjunction with accompanying drawing, become bit body by three bit leg 1 assembly weldings, on the bit leg axle of bit leg lower end, gear wheel 2 is installed, be installed on cutting teeth 3 on the gear wheel, constitute tricone bit, adopt non-engaging structure between gear wheel and the gear wheel, so that certain space is stayed at center, bit body lower end, also can make the center power stream be directly injected to the center, shaft bottom, to avoid gear wheel top tooth and tooth root gear wheel matrix by erosion, be provided with central nozzle 4 in the centre of bit body lower end, be circumferentially with pilot jet 16 on the top of central nozzle, pilot jet is formed by the top configuration of pilot jet cover 14 with central nozzle, central nozzle top offers helicla flute 12 along outer wall, helicla flute can be established the 3-9 root, the spiral fluted lower end communicates with annular groove as pressure regulating cavity 15, by overcoat pilot jet cover, promptly constitute the decompression auxiliary flow, wherein pressure regulating cavity 15 comprises taper contraction section 17, turn to bending section 18 and diffuser 19, its lower end outlet is pilot jet 16, the upper end of decompression auxiliary flow is connected with sprue 11, the decompression auxiliary flow adopts said structure, when fluid (mud) is flowed through helicla flute, the jet direction of motion becomes axially and compound motion radially, pressure regulating cavity through ring groove shape produces rotation diffusion jet again, from the pilot jet ejection, cleans gear wheel; The sprue upper end of central nozzle is contraction-like circular arc inlet, the runner of central nozzle can suitably extend and be controlled at best spray apart from scope so that central nozzle exports to the distance of shaft bottom central boss, the mud flow rate of central nozzle accounts for drill bit and sprays more than 50% of total flow, and the ratio of the mud flow rate of pilot jet and central nozzle flow is 1: 2-5, the top of central nozzle and pilot jet cover alignment pin 13 matched and by the upper end tightens up mutually, constituting the central nozzle assembly is installed in the central nozzle seat 9, lock sleeve 10 lockings by the upper end, the central nozzle seat is welded on center, bit body lower end, is linked into one with bit body; Between each bit leg of bit body periphery, be installed on wiper block 5, on the wear surface of wiper block outer peripheral face, be installed on wear-resisting gauge teeth 6, wear-resisting tooth can be the glomerocryst tooth, or Buddha's warrior attendant composite teeth or hard-metal insert, offer spray orifice reverse edge nozzle 7 up in the wiper block upper end, make that to return the liquid flow path direction on direction and the shaft bottom of reverse edge nozzle identical, on return the liquid miscarriage and give birth to certain draw, thereby improve bottom-hole flow field effectively.
Claims (7)
1, a kind of hydraulic structure of rock bit, especially the hydraulic structure of tricone bit, include three bit legs, the upper junction integrator of three bit legs, the lower end of every bit leg is installed on gear wheel, the middle part, lower end of bit body is provided with central nozzle, it is characterized in that the bit body periphery between each sheet bit leg is installed on wiper block, and wiper block is provided with spray orifice reverse edge nozzle up.
2, by the hydraulic structure of the described rock bit of claim 1, it is characterized in that central nozzle pilot jet circumferentially is set, pilot jet is connected with sprue by the decompression auxiliary flow.
3, by the hydraulic structure of claim 1 or 2 described rock bit, it is characterized in that on the outer peripheral face of described wiper block, being provided with wear-resisting gauge teeth.
4,, it is characterized in that adopting between gear wheel and the gear wheel non-engaging structure by the hydraulic structure of claim 1 or 2 described rock bit.
5, press the hydraulic structure of the described rock bit of claim 2, it is characterized in that being circumferentially with pilot jet on the top of central nozzle, pilot jet is formed by the top configuration of pilot jet cover with central nozzle, central nozzle top offers helicla flute along outer wall, helicla flute can be established the 3-9 root, the spiral fluted lower end communicates with annular groove as pressure regulating cavity, by overcoat pilot jet cover, promptly constitutes the decompression auxiliary flow.
6, by the hydraulic structure of the described rock bit of claim 5, it is characterized in that described pressure regulating cavity comprises the taper contraction section, turns to bending section and diffuser, its lower end outlet is pilot jet, and the upper end of decompression auxiliary flow is connected with sprue.
7, press the hydraulic structure of the described rock bit of claim 5, the top that it is characterized in that central nozzle alignment pin matched with the pilot jet cover and by the upper end tightens up mutually, constituting the central nozzle assembly is installed in the central nozzle seat, lock sleeve locking by the upper end, the central nozzle seat is welded on center, bit body lower end, is linked into one with bit body.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 01239801 CN2475815Y (en) | 2001-04-16 | 2001-04-16 | A hydraulic structure for tri-cone rotary drill bit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 01239801 CN2475815Y (en) | 2001-04-16 | 2001-04-16 | A hydraulic structure for tri-cone rotary drill bit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2475815Y true CN2475815Y (en) | 2002-02-06 |
Family
ID=33652165
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 01239801 Expired - Lifetime CN2475815Y (en) | 2001-04-16 | 2001-04-16 | A hydraulic structure for tri-cone rotary drill bit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2475815Y (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP3282083A1 (en) | 2016-08-09 | 2018-02-14 | Varel International, Ind., L.P. | Durable rock bit for blast hole drilling |
| CN116025290A (en) * | 2023-03-30 | 2023-04-28 | 成都迪普金刚石钻头有限责任公司 | Pressure self-adaptive PDC drill bit |
-
2001
- 2001-04-16 CN CN 01239801 patent/CN2475815Y/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP3282083A1 (en) | 2016-08-09 | 2018-02-14 | Varel International, Ind., L.P. | Durable rock bit for blast hole drilling |
| CN116025290A (en) * | 2023-03-30 | 2023-04-28 | 成都迪普金刚石钻头有限责任公司 | Pressure self-adaptive PDC drill bit |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CX01 | Expiry of patent term |
Expiration termination date: 20110416 Granted publication date: 20020206 |