CN204212697U - Be adapted to the PDC drill bit that shale gas well shale formation creeps into - Google Patents
Be adapted to the PDC drill bit that shale gas well shale formation creeps into Download PDFInfo
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- CN204212697U CN204212697U CN201420657527.7U CN201420657527U CN204212697U CN 204212697 U CN204212697 U CN 204212697U CN 201420657527 U CN201420657527 U CN 201420657527U CN 204212697 U CN204212697 U CN 204212697U
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- drill bit
- section
- cutting teeth
- arc
- inner cone
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Abstract
The utility model relates to the drilling equipment of shale gas, specifically a kind of PDC drill bit being adapted to shale gas well shale formation and creeping into.This drill bit includes the bizet that has multiple wing, the gyroscope wheel profile of described bizet is made up of along the outward extending inner cone section of inner cone, the gauge section these three sections of arc section and outline of straight line that extends to outside gauge section by inner cone edge the center of drill bit indent, wherein arc section is combined by multistage different radii circular arc, and arc radius increases from the inside to the outside gradually; These three sections of profiles are distributed with cutting teeth.What the utility model can adapt to shale formation creeps into operation, and drilling efficiency is high, long service life.
Description
Technical field
The utility model relates to the drilling equipment of shale gas, specifically a kind of PDC drill bit being adapted to shale gas well shale formation and creeping into.
Background technology
Shale gas resource is as effective making & breaking attention in recent years of conventional gas and oil resource, but in shale gas well actual well drilled, especially in shale formation drilling process due to shortcoming specific aim PDC drill bit, cause drilling efficiency low, and have a strong impact on the Efficient Exploration exploitation of shale gas.Because shale formation ubiquity stratum is ancient, compressive strength is high, siliceous in shale, carbonaceous content is high, even siliceous bands sheet grow feature.Conventional PDC drill bit cannot merely with cut mode fractured rock, but to roll, the multiple broken rock mode such as grinding and shearing works, especially when siliceous bands met by brill, the cutting teeth of the drill bit vertex of a cone and shoulder is caused easily to produce cracked and wear and tear in advance, lose brokenly rock effect, thus have impact on drilling life of bit, ideal machine drilling speed and drilling depth cannot be obtained.
Summary of the invention
Technical problem to be solved in the utility model is, provide a kind of can adapt to shale formation creep into operation, and drilling efficiency is high, long service life be adapted to the PDC drill bit that shale gas well shale formation creeps into.
The utility model is adapted to the PDC drill bit that shale gas well shale formation creeps into and includes the bizet that has multiple wing, the gyroscope wheel profile of described bizet is made up of along the outward extending inner cone section of inner cone, the gauge section these three sections of arc section and outline of straight line that extends to outside gauge section by inner cone edge the center of drill bit indent, wherein arc section is combined by multistage different radii circular arc, and arc radius increases from the inside to the outside gradually; These three sections of profiles are distributed with cutting teeth.
Described cutting teeth is uniformly distributed in described inner cone section and gauge section, and described arc section cutter set density increases with the increase of arc radius.
The negative cutting angle number of degrees of described cutting teeth are-15 ° in inner cone section, fade to-19 ° gradually, be-20 ° in gauge section at arc section with the increase of arc radius by-16 °.
The cutting teeth of described arc section is made up of the main cutting tooth arranged in pairs and secondary cutting teeth, wherein main cutting tooth diameter is greater than negative cutting teeth diameter, the ride out difference of major and minor cutting teeth is 1/2 of major and minor cutting teeth diameter difference, every a pair major and minor cutting teeth is all on the circle of the same diameter being the center of circle with drill bit center, and negative cutting angle is identical.
Be provided with interchangeable nozzles between each wing stage casing, before the cutting teeth that bizet center is nearest, be provided with a not interchangeable nozzles, interchangeable nozzles diameter is greater than not interchangeable nozzle diameter.
The beneficial effects of the utility model are, inner cone section to gauge section stress equalization, negative cutting angle and cutter set density suitable, ensure that this position cutting teeth can even effective wedging stratum, fractured rock, avoids owing to repeatedly rolling, cutting teeth that grinding causes damages in advance; Simultaneously arranging of secondary cutting teeth avoids bit drills on the one hand to meet the high rigidity stratum such as siliceous bands excessive and cracked because the pressure of the drill loads the excessive cutting teeth local pressure caused; On the other hand when main cutting tooth damages, main cutting tooth is replaced to break rock.Compared with conventional PDC drill bit, the utility model improves the application life of drill bit by multiple technologies means, adds the comprehensive utilization benefit of single PDC drill bit.
Accompanying drawing explanation
Fig. 1 is end face structure schematic diagram of the present utility model;
Fig. 2 is the outline line schematic diagram of bizet half of the present utility model.
Detailed description of the invention
As shown in Figure 1, this PDC drill bit includes the bizet 2 that has multiple wing 1; As shown in Figure 2, the gyroscope wheel profile of described bizet forms by three sections: by the center of drill bit indent along the outward extending inner cone section 3 of inner cone, extend to the arc section 4 of outside gauge section and the gauge section 5 of outline of straight line by inner cone edge; Wherein arc section 4 is combined by multistage different radii circular arc, and arc radius increases from the inside to the outside gradually, ensure that bit force equilibrium change, avoid local tooth too stressed from structure; These three sections of profiles are distributed with cutting teeth 6.
Cutting teeth 6 is uniformly distributed in inner cone section 3 and gauge section 4, and arc section cutter set density increases with the increase of arc radius.According to the difference of drill bit different parts shear action power size, adjustment cutter set density, ensures drill bit uniform wear.
The negative cutting angle number of degrees of cutting teeth 6 are-15 ° in inner cone section 3, fade to-19 ° gradually, be-20 ° in gauge section 5 at arc section 4 with the increase of arc radius by-16 °.Bizet center is sharper keen to the negative cutting angle of inner cone, can accelerate broken centre rock, and with arc radius change, arc section negative cutting angle ensures that each cutting teeth is can under the prerequisite on effective wedging stratum, uniform force.
The cutting teeth 6 of arc section 4 is made up of the main cutting tooth 61 arranged in pairs and secondary cutting teeth 62, wherein main cutting tooth diameter is greater than negative cutting teeth diameter, the ride out difference of major and minor cutting teeth is 1/2 of major and minor cutting teeth diameter difference, every a pair major and minor cutting teeth is all on the circle of the same diameter being the center of circle with drill bit center, and negative cutting angle is identical.Avoid the high rigidity stratum such as bit drills chance siliceous bands on the one hand excessive and cracked because the pressure of the drill loads the excessive cutting teeth local pressure caused; On the other hand when main cutting tooth damages, main cutting tooth is replaced to break rock.
Be provided with interchangeable nozzles 7 between each wing 1 stage casing, before the cutting teeth that bizet center is nearest, be provided with a not interchangeable nozzles 8, interchangeable nozzles diameter is greater than not interchangeable nozzle diameter.Ensure that several key positions that drill bit breaks rock cool in time, and fully take rock.
Claims (5)
1. be adapted to the PDC drill bit that shale gas well shale formation creeps into, include the bizet (2) with multiple wing (1); The gyroscope wheel profile of described bizet forms by three sections: by the center of drill bit indent along the outward extending inner cone section (3) of inner cone, extend to the arc section (4) of outside gauge section and the gauge section (5) of outline of straight line by inner cone edge; It is characterized in that: arc section (4) is combined by multistage different radii circular arc, and arc radius increases from the inside to the outside gradually; These three sections of profiles are distributed with cutting teeth (6).
2. the PDC drill bit being adapted to shale gas well shale formation and creeping into according to claim 1, is characterized in that: cutting teeth (6) is uniformly distributed in inner cone section (3) and gauge section (4), and arc section (4) cutter set density increases with the increase of arc radius.
3. the PDC drill bit being adapted to shale gas well shale formation and creeping into according to claim 1, it is characterized in that: the negative cutting angle number of degrees of cutting teeth (6) are-15 ° in inner cone section (3), gradually fade to-19 ° with the increase of arc radius by-16 ° at arc section (4), be-20 ° in gauge section (5).
4. the PDC drill bit being adapted to shale gas well shale formation and creeping into according to claim 1, it is characterized in that: the cutting teeth (6) of arc section (4) is made up of the main cutting tooth (61) arranged in pairs and secondary cutting teeth (62), wherein main cutting tooth diameter is greater than negative cutting teeth diameter, the ride out difference of major and minor cutting teeth is 1/2 of major and minor cutting teeth diameter difference, every a pair major and minor cutting teeth is all on the circle of the same diameter being the center of circle with drill bit center, and negative cutting angle is identical.
5. the PDC drill bit being adapted to shale gas well shale formation and creeping into according to claim 1, it is characterized in that: between each wing (1) stage casing, be provided with interchangeable nozzles (7), before the cutting teeth that bizet center is nearest, be provided with a not interchangeable nozzles (8), interchangeable nozzles diameter is greater than not interchangeable nozzle diameter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420657527.7U CN204212697U (en) | 2014-11-06 | 2014-11-06 | Be adapted to the PDC drill bit that shale gas well shale formation creeps into |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420657527.7U CN204212697U (en) | 2014-11-06 | 2014-11-06 | Be adapted to the PDC drill bit that shale gas well shale formation creeps into |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204212697U true CN204212697U (en) | 2015-03-18 |
Family
ID=52981378
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420657527.7U Expired - Fee Related CN204212697U (en) | 2014-11-06 | 2014-11-06 | Be adapted to the PDC drill bit that shale gas well shale formation creeps into |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204212697U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104358522A (en) * | 2014-11-06 | 2015-02-18 | 中国石油化工股份有限公司 | PDC (Polycrystalline Diamond Compact) drill bit suitable for shale gas well shale stratum drilling |
| CN105134084A (en) * | 2015-08-17 | 2015-12-09 | 宝鸡石油机械有限责任公司 | PDC drilling bit with mixed pre-crushing tooth arrangement |
| CN114776226A (en) * | 2022-04-21 | 2022-07-22 | 中国石油大学(北京) | PDC drill bit with different inner and outer parts and manufacturing method of PDC drill bit |
-
2014
- 2014-11-06 CN CN201420657527.7U patent/CN204212697U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104358522A (en) * | 2014-11-06 | 2015-02-18 | 中国石油化工股份有限公司 | PDC (Polycrystalline Diamond Compact) drill bit suitable for shale gas well shale stratum drilling |
| CN105134084A (en) * | 2015-08-17 | 2015-12-09 | 宝鸡石油机械有限责任公司 | PDC drilling bit with mixed pre-crushing tooth arrangement |
| CN114776226A (en) * | 2022-04-21 | 2022-07-22 | 中国石油大学(北京) | PDC drill bit with different inner and outer parts and manufacturing method of PDC drill bit |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150318 Termination date: 20191106 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |