CN201401131Y - PDC drill bit equipped with longitudinal cutting teeth - Google Patents
PDC drill bit equipped with longitudinal cutting teeth Download PDFInfo
- Publication number
- CN201401131Y CN201401131Y CN200920080452XU CN200920080452U CN201401131Y CN 201401131 Y CN201401131 Y CN 201401131Y CN 200920080452X U CN200920080452X U CN 200920080452XU CN 200920080452 U CN200920080452 U CN 200920080452U CN 201401131 Y CN201401131 Y CN 201401131Y
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- Prior art keywords
- drill bit
- cutting teeth
- tooth
- cutting
- cut
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Abstract
A PDC drill bit equipped with longitudinal cutting teeth belongs to the technical field of petroleum drilling tools. The drill bit comprises a drill bit body, a cutter wing and a plurality of transversal cutting teeth arranged on each cutting circumference of the cutter wing, and is characterized in that the cutting teeth have at least a longitudinal cutting tooth arranged in a T-shape with the transversal cutting teeth, and the cutter exposure of the longitudinal cutting tooth is higher than that of the transversal cutting teeth. The drill bit has the advantages of small cutting resistance, enhances the durableness of the cutting teeth, and prolongs the service life of the drill bit, thereby being favorable for reducing the manufacture and use costs. The drill bit is especially suitable for the drilling of superhard formation.
Description
Technical field
The utility model relates to the drill bit that uses in a kind of petroleum drilling operation.Belong to the oil drilling tool technical field.
Background technology
The PDC drill bit is a kind of diamond bit of extensive use in present oil, the natural gas drilling.This drill bit is made of bit body, wing, some cutting teeths of being made by diamond compact of being installed on the wing.It fast, efficiently, applied widely, obtained numerous users and insider's approval, but it also exists certain limitation, such as, cutting teeth is horizontal laying, its cutting principle is that work plane pushes, wedges then the stratum and shears by the edge of work plane, therefore in the face of superhard stratum the time, this extruding, wedging and shearing are difficult to carry out, so efficient is very low, when running into superhard stratum, it is unusual painstaking that this PDC drill bit that has only the cross cutting tooth just seems, drilling depth also unusual slowly.
The utility model content
In order to overcome this phenomenon, the utility model proposes a kind of PDC drill bit that except that having the cross cutting tooth, also is laid with the straight-cut tooth.This drill bit by bit body, wing, be installed in the some cross cutting teeth that respectively cut on the wing on the circumference and constituted, it is characterized in that described cutting teeth has one at least for being the straight-cut tooth that the T font is laid with the cross cutting tooth, the sword that goes out of described straight-cut tooth is higher than the cross cutting tooth.
We know that superhard stratum is stiff on the one hand, and plasticity is very poor on the other hand, in case its top layer of thing wedging is arranged, will rising, it is scarce to split and collapse.Just as cutting a piece of glass, when glazing knife on glass streak gently after, cut of appearance behind the cutter, the width of cut and the degree of depth are all big more than 10 times than the cutting edge of glazing knife.This cut is collapsed by glass and spatters back formation.Just after the glazing knife wedging, owing to glass plasticity difference rise split formed.We are designed to vertical layout to a part of cutting teeth, just will make in this way superhard stratum is attacked, cut.Be that this drill bit is when rotary work, (along the drill bit direction of rotation) forward of straight-cut tooth and the downward sharp-pointed angle of wedge (and the cross cutting tooth is a face at this moment) that all formed, this angle of wedge makes that no matter the straight-cut tooth is forward or downwards, all is easier to wedge the stratum.Promptly, going out the sharp-pointed angle of wedge that straight-cut tooth that sword is higher than the cross cutting tooth forms can more easily wedge the stratum and leave a groove on its surface, we know, remaining will be easy to many as long as anything tears an openning, so, by cross cutting tooth along groove doing a cleaning, can finish once combination cutting, thereby reach the purpose that the PDC drill bit creeps into fast to superhard stratum thereafter.
The straight-cut tooth can have multiple laying mode.Such as, for large-sized drill bit, can cut at each and all lay the straight-cut tooth on the circumference.Can all be laid on the wing, also can be laid in respectively on each wing.
Compared with the aforementioned existing similar products, the utility model has the advantages that resistance to cutting is little, on the one hand it requiredly gives its moment of torsion also little by drill pipe transmission, at the drill bit of superhard stratum this under the same conditions cloth tooth mode can bore undoubtedly darker.Can effectively improve the durability of cutting teeth on the other hand, prolong drilling life of bit, be of value to the reduction manufacturing cost and use cost.Utilize that the cutting way on sharp-pointed angle of wedge wedging stratum is easier finishes creeping into fast superhard stratum.
Content of the present utility model further illustrates with the following Examples, but content of the present utility model is not limited only to content related among the embodiment.
Description of drawings
Fig. 1 is the structural representation of utility model
Fig. 2 is the upward view of Fig. 1
The specific embodiment
Referring to Fig. 1,2, the utility model by bit body 1, wing 2, be installed in some cross cutting teeth 3 of respectively cutting on the wing 2 on the circumference and be the straight-cut tooth 4 that the T font lays and constituted with cross cutting tooth 3, the sword that goes out of described straight-cut tooth 4 is higher than cross cutting tooth 3.Straight-cut tooth 4 is laid on three wings in the present embodiment.Certainly, also straight-cut tooth 4 can be interspersed on each wing.
Claims (1)
1, a kind of PDC drill bit that is laid with the straight-cut tooth, by bit body, wing, be installed in the some cross cutting teeth that respectively cut on the wing on the circumference and constituted, it is characterized in that described cutting teeth has one at least for being the straight-cut tooth that the T font is laid with the cross cutting tooth, the sword that goes out of described straight-cut tooth is higher than the cross cutting tooth.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200920080452XU CN201401131Y (en) | 2009-04-28 | 2009-04-28 | PDC drill bit equipped with longitudinal cutting teeth |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200920080452XU CN201401131Y (en) | 2009-04-28 | 2009-04-28 | PDC drill bit equipped with longitudinal cutting teeth |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201401131Y true CN201401131Y (en) | 2010-02-10 |
Family
ID=41660931
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200920080452XU Expired - Lifetime CN201401131Y (en) | 2009-04-28 | 2009-04-28 | PDC drill bit equipped with longitudinal cutting teeth |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201401131Y (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105443043A (en) * | 2014-09-27 | 2016-03-30 | 中国石油化工集团公司 | PDC drill bit capable of changing blade number |
-
2009
- 2009-04-28 CN CN200920080452XU patent/CN201401131Y/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105443043A (en) * | 2014-09-27 | 2016-03-30 | 中国石油化工集团公司 | PDC drill bit capable of changing blade number |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20100210 |
|
| DD01 | Delivery of document by public notice | ||
| DD01 | Delivery of document by public notice |
Addressee: Chengdu Deep Diamond Bit Co., Ltd. Document name: Notification of Expiration of Patent Right Duration |