CN2711368Y - Composite drill-bit made of poly-crystal diamond - Google Patents
Composite drill-bit made of poly-crystal diamond Download PDFInfo
- Publication number
- CN2711368Y CN2711368Y CN 200420028670 CN200420028670U CN2711368Y CN 2711368 Y CN2711368 Y CN 2711368Y CN 200420028670 CN200420028670 CN 200420028670 CN 200420028670 U CN200420028670 U CN 200420028670U CN 2711368 Y CN2711368 Y CN 2711368Y
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- drill bit
- cutting teeth
- drill
- bit
- cutting
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Abstract
The utility model relates to a composite drill-bit made of poly-crystal diamond. The spaced teeth of the drill-bit are double protective spaced teeth which can organically divide cutting teeth into two cross teams, so that the drill-bit can stagingly bear the drilling load of different stratums, and the drilling efficiency can be improved. Furthermore, the back obliquity and side obliquity of the cutting teeth are adjusted according to the characteristics of different lithology, the back obliquity of the cutting teeth is adjusted to 21 degree, and the side obliquity of the cutting teeth is adjusted to 3 degree, so that the crown shape of the drill bit can be the best for the rock. In addition, the composite drill-bit made of poly-crystal diamond can provide drill-bits with deep chip-removing flutes and powerful chip removing ability.
Description
Technical field
The utility model relates to a kind of composite polycrystal-diamond (PDC) drill bit that can pass through layer of gravel.
Background technology
Drill bit of the prior art as shown in Figure 1, 2.Above-mentioned brill is six wings, and the cutting contour shape of wing 1 is middle long parabola.When layer of gravel is carried out drilling well, damage very serious to above-mentioned drill bit impact.Great majority have to pull out of hole, and next rock bit is finished and drilled group stratum, Guantao more subsequently.So not only used a rock bit more, and more than once making a trip, cause drilling period to increase.
The utility model content
At existing drill bit insufficient strength, situation that can not a drilling well, the utility model provides a kind of improved drill bit structure.
The utility model provides a kind of drill bit structure, it is characterized in that: for its cutting teeth, for twin-stage protection cloth tooth, cutting teeth is divided into two groups of ranks, wherein one group cutting power is much larger than the cutting power of another group.
In addition, the cutting teeth back rake angle of drill bit is 21 °.
In addition, drill bit increases the back toothrow at local location.
In addition, the cutting teeth angle of heel of drill bit is 3 °.
In addition, drill bit is taked dark chip area structure, and the most shallow place of chip area is 45mm, chip area bosom 72mm.
In addition, the solid capacity in conjunction with wing is equipped with rational water horse power, increasing nozzle spray angle, 16 ° in heart portion, 35 ° of noses.
Technique effect of the present utility model is:
1, because the cloth tooth of the utility model PDC drill bit is a twin-stage protection cloth tooth, organically cutting teeth is divided into two groups of ranks, allows drill bit bear the drilling well load of Different Strata stage by stage, improve drilling efficiency best.
2, according to different lithological characteristics, cutting teeth back rake angle and angle of heel are made adjustment, make the drill bit crown type help damaged this rocks most.
3, the chip area structure is dark, and the chip removal ability of drill bit is strong.
Description of drawings
Fig. 1 is a drill bit lateral view in the prior art;
Fig. 2 is a drill bit end face schematic diagram in the prior art;
Fig. 3 is the utility model drill bit lateral view;
Fig. 4 is the utility model drill bit end face schematic diagram;
Fig. 5 is two groups of cutting teeth areas of cut of the utility model drill bit schematic diagram;
Fig. 6 increases the schematic diagram of back toothrow for the utility model local location;
Fig. 7 shows the schematic diagram of the angle of the utility model bit cutting teeth directional rear-inclined;
Fig. 8 shows the utility model cutting teeth angle of heel schematic diagram.
The specific embodiment
The situation that drill bit design that the utility model provides is used with reference to existing drill bit changes the cloth tooth of PDC drill bit into twin-stage protection cloth tooth, promptly shown in Fig. 3,4, organically cutting teeth is divided into two groups of ranks 11,12.By inhomogeneous design, wherein one group cutting power is much larger than the cutting power of another group the cutting shaded area of two groups of cutting teeths among Fig. 5 (see shown in) with the cutting power of each cutting teeth in this design.
In the previous stage of drilling well, main the pressure of the drill on the drill bit is born by first group of cutting teeth 1, and the load that second group of cutting teeth 2 born is very little, cuts the ability on stratum to improve this stage drill bit in drilling process, also promptly eat as ability, improve the rate of penetration of drilling well best.
When drill bit entered middle and lower part, group stratum, Guantao, bit wear speeded up, and at this moment, second group of cutting teeth 2 begins to bring into play its effect, strengthened the anti-grainding capacity of drill bit.According to drill bit mode of occupation in early stage, increase back toothrow 13 (see figure 6)s simultaneously, further improve the overall performance of drill bit, improve the rate that drills in group stratum, Guantao at local location.
In addition, in drill bit design, also cutting teeth back rake angle, angle of heel are adjusted, select a kind of mode that helps damaged this rocks most to cooperate corresponding drill bit crown type to come designing bits according to special lithology.
The rear-inclined angle on relative stratum when above-mentioned cutting teeth back rake angle is the cutting teeth cutting, promptly as shown in Figure 7, the angle on the cutting teeth 72 relative stratum 71 of wing 70.Preferably change cutting teeth back rake angle α into 21 ° by original 25 °.
As shown in Figure 8, cutting teeth was at radially sweptback angle beta when the cutting teeth angle of heel was drill bit, and this angle helps chip removal, and cutting teeth angle of heel β is 3 ° in this design, to reach the best stressed and MaLS of cutting teeth.
In addition, the utility model is taked dark chip area structure, and the most shallow place changes 45mm into by original 38mm with chip area, changes the chip area bosom into 72mm by original 58mm.
Solid capacity in conjunction with wing is equipped with rational water horse power, promptly three operator wings are finished 61% of overall bit cutting landwaste amount, thereby designs of nozzles make these three the operator wings injection flow account for 61% of drill bit total flow, make that the chip removal of drill bit in drilling process is reasonable, best.Strengthen nozzle spray angle, with 11 ° in former heart portion, nose changes 16 ° in heart portion into for 25 °, and 35 ° of noses its objective is to make the chip removal smoothness, avoid Repeated Cutting.
Claims (6)
1, a kind of drill bit structure is characterized in that:
For its cutting teeth, for twin-stage protection cloth tooth, cutting teeth is divided into two groups of ranks, wherein one group cutting power is much larger than the cutting power of another group.
2, drill bit structure according to claim 1 is characterized in that:
The cutting teeth back rake angle is 21 °.
3, according to the described drill bit structure of claim 1, it is characterized in that:
Increase the back toothrow at local location.
4, drill bit structure according to claim 1 is characterized in that:
The cutting teeth angle of heel is 3 °.
5, drill bit structure according to claim 1 is characterized in that:
Dark chip area structure, the most shallow place of chip area is 45mm, chip area bosom 72mm.
6, drill bit structure according to claim 5 is characterized in that:
Solid capacity in conjunction with wing is equipped with rational water horse power, strengthens nozzle spray angle, 16 ° in heart portion, 35 ° of noses.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200420028670 CN2711368Y (en) | 2004-04-02 | 2004-04-02 | Composite drill-bit made of poly-crystal diamond |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200420028670 CN2711368Y (en) | 2004-04-02 | 2004-04-02 | Composite drill-bit made of poly-crystal diamond |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2711368Y true CN2711368Y (en) | 2005-07-20 |
Family
ID=36192471
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200420028670 Expired - Lifetime CN2711368Y (en) | 2004-04-02 | 2004-04-02 | Composite drill-bit made of poly-crystal diamond |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2711368Y (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101975025A (en) * | 2010-10-09 | 2011-02-16 | 东北石油大学 | Fractal design method for diamond particle distribution on diamond bit |
-
2004
- 2004-04-02 CN CN 200420028670 patent/CN2711368Y/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101975025A (en) * | 2010-10-09 | 2011-02-16 | 东北石油大学 | Fractal design method for diamond particle distribution on diamond bit |
| CN101975025B (en) * | 2010-10-09 | 2012-11-21 | 东北石油大学 | Fractal design method for diamond particle distribution on diamond 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: 20140402 Granted publication date: 20050720 |