CN202627971U - Air hammer drill bit for novel debris discharging structure - Google Patents
Air hammer drill bit for novel debris discharging structure Download PDFInfo
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- CN202627971U CN202627971U CN 201220289906 CN201220289906U CN202627971U CN 202627971 U CN202627971 U CN 202627971U CN 201220289906 CN201220289906 CN 201220289906 CN 201220289906 U CN201220289906 U CN 201220289906U CN 202627971 U CN202627971 U CN 202627971U
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- drill bit
- fan
- air hammer
- central plane
- hammer drill
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Abstract
The utility model relates to an air hammer drill bit for a novel debris discharging structure, and belongs to the field of gas drilling downhole tools for petroleum and gas. The air hammer drill bit mainly comprises a drill bit body and drill bit teeth, wherein the drill bit body mainly comprises a central plane, small debris discharging grooves, main nozzles, side nozzles and fan-shaped debris discharging grooves, wherein the two main nozzles are symmetrically designed on the central plane of the drill bit body; the diameter of each main nozzle is 28 to 30 mm; the distance between the centers of the circles of the two main nozzles is 58 to 64 mm; the inclination angle of each main nozzle is 10 to 15 degrees; simultaneously, four fan-shaped debris discharging grooves are designed; the angle of each fan-shaped debris discharging groove is 5 to 8 degrees; each fan-shaped debris discharging groove is provided with a side nozzle; the diameter of each side nozzle is 18 to 22 mm; and the inclination angle of each side nozzle is 30 to 35 degrees. By using the air hammer drill bit, the rock debris carrying capacity of gas can be improved, and the erosion of a well wall caused by a gas flow is reduced, so that the effect of protecting the well wall is achieved.
Description
Technical field
The utility model relates to a kind of air hammer drill bit of novel chip removal structure, belongs to petroleum gas gas drilling downhole tool field.
Background technology
The gas drilling technology is with a kind of under-balanced drilling technology of air as circulatory mediator.Air substitutes the drilling fluid in the conventional drilling, outer circulation in drill string, and it mainly bears the following aspects effect: be air hammer drill bit transferring power; Cutting carring, the bottom-hole cleaning; Cools reamer head and drilling tool.Can air hammer drill bit chip removal structure directly influences the chip removal ability of drill bit, protect the borehole wall effectively, reduces its erosion attack effect to the borehole wall, for the discharge of shaft bottom landwaste provides good passage.
Find that according to Field Research the air hammer drill bit exists chip removal not smooth, especially there is the phenomenon of mud drum in the bit central position; Cause landwaste can not in time discharge the shaft bottom; Landwaste is piled up in the shaft bottom and is repeated fragmentation, has a strong impact on efficiency of breaking rock and bit speed, causes the application life of drill bit short; Increase the drill bit number of times that makes a trip, greatly increase drilling cost.Because high velocity air is very serious to the erosion damage phenomenon of the borehole wall, often cause the generation of leakage on the other hand, a large amount of gases can cause the borehole wall to collapse when serious, and then cause the generation of down-hole accidents such as bit freezing, bury drills from the leakage of borehole wall cracks.Therefore, press for and develop a kind of chip removal ability and air hammer drill bit of improving, to promote the development of air hammer drilling technology with protection borehole wall stability.
Summary of the invention
The purpose of the utility model is in order to overcome the deficiency of prior art, a kind of air hammer drill bit of novel chip removal structure to be provided, can improve drill bit chip removal ability, reduce bottom hole temperature (BHT), the protection borehole wall.
To achieve these goals, the utility model adopts following technical scheme:
The air hammer drill bit of a kind of novel chip removal structure of the utility model mainly is made up of bit body and bit teeth.Bit body comprises that mainly central plane, little chip area, main burner, side nozzle, fan-shaped chip area constitute; Bit teeth is hard alloy spherical-teeth.In the central plane symmetric design of bit body two main burners, the diameter of said main burner is 28-30mm, the distance of center circle between two main burners is from being 58-64mm, the main burner inclination angle is 10 °-15 °; Central plane at bit body is provided with four fan-shaped chip areas simultaneously, and fan-shaped chip area angle is 5 °-8 °, and each fan-shaped chip area is provided with a side nozzle, and the diameter of side nozzle is 18-22mm, and the side nozzle inclination angle is 30 °-35 °.Drill margin is provided with a plurality of little chip areas, to increase drill bit chip removal ability.Said drill teeth all is hard-metal inserts.
The beneficial effect of the utility model: the size and the intensity that 1, reduce whirlpool zone in the flow field; Eliminate the viscous flow and the backflow phenomenon at center, shaft bottom; Reduce the probability that landwaste is repeated to take back the shaft bottom, avoided the repetition of shaft bottom landwaste broken, improve the chip removal ability of central area.2, more conventional air hammer drill bit is compared, and has increased the cross flow layer region in gases at high pressure flow fields, can play the reduction bottom hole temperature (BHT); The heat fatigue effect that the protection bit teeth produces when well drilling and rock crushing; Improve the application life of drill bit, reach the shortening drilling period, reduce production costs.3, improve gas-entrained landwaste ability, reduced air-flow, thereby played the effect of the protection borehole wall the washing away of the borehole wall.
Description of drawings
Fig. 1 is the structural representation of the air hammer drill bit of a kind of novel chip removal structure of the utility model.
Fig. 2 is the main burner structural representation of the utility model.
Fig. 3 is the side nozzle structural representation of the utility model.
Among the figure: 1. central plane; 2. little chip area; 3. hard-metal insert; 4. main burner; 5. side nozzle; 6. fan-shaped chip area; 7. main burner runner; 8. side nozzle runner.
The specific embodiment
Below in conjunction with accompanying drawing and embodiment the present invention is described further:
Like Fig. 1, Fig. 2 and shown in Figure 3; The air hammer drill bit of a kind of novel chip removal structure of the utility model; Mainly be made up of bit body and bit teeth, bit body comprises that mainly central plane 1, little chip area 2, main burner 4, side nozzle 5, fan-shaped chip area 6 constitute, and bit teeth is hard alloy spherical-teeth 3.In central plane 1 symmetric design of bit body two main burners 4; The diameter of said main burner 4 is 28-30mm, and the distance of center circle between two main burners 4 is from being 58-64mm, and the angle of main burner runner 7 center lines and central plane 1 vertical line is α; Be the main burner inclination angle, α is 10 °-15 °.Gases at high pressure form the cross flow layer through main burner runner 7 impact shaft bottoms in the shaft bottom, and landwaste is separated with basement rock; Overcome the mud drum phenomenon that conventional bit central plane 1 central area exists; Improved efficiency of breaking rock, the cross flow layer is carried into little chip area with landwaste, discharges outside the well.Simultaneously, the cross flow layer is full of whole shaft bottom, can reduce hard-metal insert 3 temperature, reduces the heat fatigue effect of hard-metal insert 3, improves the application life of hard-metal insert 3.
Claims (2)
1. the air hammer drill bit of a novel chip removal structure; Mainly form by bit body and bit teeth; Bit body comprises that mainly central plane (1), little chip area (2), main burner (4), side nozzle (5), fan-shaped chip area (6) constitute; It is characterized in that: at the central plane (1) of bit body two main burners (4) of having gone up symmetric design, the diameter of said main burner (4) is 28-30mm, and the distance of center circle between two main burners (4) is from being 58-64mm; The angle of main burner runner (7) center line and central plane (1) vertical line is α, i.e. main burner inclination angle, and α is 10 °-15 °.
2. the air hammer drill bit of a kind of novel chip removal structure according to claim 1; It is characterized in that: the central plane (1) at bit body is provided with four fan-shaped chip areas (6); The anglec of rotation of fan-shaped chip area (6) is 5 °-8 °; Each fan-shaped chip area (6) has designed a side nozzle (5), and the diameter of side nozzle (5) is 18-22mm; The angle of side nozzle runner (8) center line and central plane (1) vertical line is β, and β is 30 °-35 °.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220289906 CN202627971U (en) | 2012-06-20 | 2012-06-20 | Air hammer drill bit for novel debris discharging structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220289906 CN202627971U (en) | 2012-06-20 | 2012-06-20 | Air hammer drill bit for novel debris discharging structure |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202627971U true CN202627971U (en) | 2012-12-26 |
Family
ID=47381179
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220289906 Expired - Fee Related CN202627971U (en) | 2012-06-20 | 2012-06-20 | Air hammer drill bit for novel debris discharging structure |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202627971U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103266854A (en) * | 2013-05-14 | 2013-08-28 | 常州大学 | Hydraulic drive percussion primary-secondary drilling bit |
| CN104747084A (en) * | 2015-04-03 | 2015-07-01 | 核工业井巷建设公司 | Pneumatic drill reamer bit suitable for underwater rock plug blasting construction |
-
2012
- 2012-06-20 CN CN 201220289906 patent/CN202627971U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103266854A (en) * | 2013-05-14 | 2013-08-28 | 常州大学 | Hydraulic drive percussion primary-secondary drilling bit |
| CN104747084A (en) * | 2015-04-03 | 2015-07-01 | 核工业井巷建设公司 | Pneumatic drill reamer bit suitable for underwater rock plug blasting construction |
| CN104747084B (en) * | 2015-04-03 | 2017-06-13 | 核工业井巷建设集团公司 | A kind of air drill reaming bit suitable for underwater rock plug burst construction |
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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: 20121226 Termination date: 20140620 |
|
| EXPY | Termination of patent right or utility model |