CN201546625U - PDC drill bit for avoiding negative cutting angles of balling - Google Patents
PDC drill bit for avoiding negative cutting angles of balling Download PDFInfo
- Publication number
- CN201546625U CN201546625U CN2009202430719U CN200920243071U CN201546625U CN 201546625 U CN201546625 U CN 201546625U CN 2009202430719 U CN2009202430719 U CN 2009202430719U CN 200920243071 U CN200920243071 U CN 200920243071U CN 201546625 U CN201546625 U CN 201546625U
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- China
- Prior art keywords
- drill bit
- pdc drill
- cutting
- balling
- angles
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
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- Earth Drilling (AREA)
Abstract
A PDC drill bit for avoiding negative cutting angles of balling belongs to the technical field of manufacture of petroleum drilling tools. The PDC drill bit comprises a drill bit body, a cutter wing and a plurality of cutting teeth formed on the cutter wing, and is characterized in that a cutting surface of the cutting teeth adopts a beveling surface, and the cutting teeth at the negative cutting angles are formed on the cutter wing. The PDC drill bit has the advantages that the chip removal operation is smooth; and the phenomena of attachment and accumulation can not be generated so as to effectively avoid bit balling. In addition, the wedge angles of the cutting teeth with the negative cutting angles are small, and the PDC drill bit is easily wedged into the formation, so that the drilling efficiency of the PDC drill bit on the soft formation is favorably improved.
Description
Technical field
The utility model relates to oil and creeps into the PDC drill bit that uses in the operation.Belong to the oil drilling tool manufacture technology field.
Background technology
Existing P DC drill bit is made of bit body, wing, some cutting teeths of being installed on the wing.Its cutting teeth is cylindrical, and the cutting angle that is constituted is the tangent top rake.When the PDC drill bit of this tangent top rake creeps in mud stone, can produce forward and downward two component, in soft formation, this downward component has the extruding force of an obstruction all the time to the landwaste that cuts, and it is not smooth to make it chip removal, cut tiny landwaste and drilling mud and close on the mud stone, form very sticking clod, be bonded at earlier on the tooth, progressively pile up then, gradually whole chip area is piled with obstruction, form mud drum.The generation of mud drum has increased the number of times that makes a trip, and has seriously reduced drilling efficiency.
The utility model content
The purpose of this utility model is the above-mentioned shortcoming that overcomes the PDC drill bit of existing tangent top rake, and a kind of negative cutting angle PDC drill bit that can prevent mud drum is provided.
The formation that realizes the negative cutting angle PDC drill bit that prevents mud drum of the utility model purpose comprises bit body, wing, is installed in the some cutting teeths on the wing, the cutting face that it is characterized in that described cutting teeth is a scarf, and cutting teeth is negative cutting angle and is installed on the wing.
Operating principle of the present utility model is as follows:
When the PDC drill bit of this negative cutting angle crept in mud stone, owing to be negative cutting angle, the component of generation made progress, and the component that makes progress helps chip removal, makes chip removal smooth and easy, thereby can not produce and adhere to packing phenomenon and realize effectively preventing bit balling.In addition,, be easy to wedge the stratum, be of value to and improve the drilling efficiency of PDC drill bit at soft formation because the angle of wedge of the cutting teeth of negative cutting angle is little.
Below in conjunction with embodiment content of the present utility model is done further explanation.
Description of drawings
Fig. 1 is a structural representation of the present utility model
Fig. 2 is the vertical view of Fig. 1
Fig. 3 is that the A of Fig. 1 is to local enlarged diagram
Fig. 4 is a tangent top rake schematic diagram
The specific embodiment
Referring to Fig. 1～3, originally the formation that prevents the negative cutting angle PDC drill bit of mud drum comprises bit body 1, wing 2, is installed in the some cutting teeths 3 on the wing, the cutting face 4 of described cutting teeth is a scarf, and cutting angle β is installed on the wing 2 with the negative cutting angle less than 90 °.Be convenient relatively understanding, Fig. 4 has provided the schematic diagram of tangent top rake.F is the power that promotes the drill bit rotation among the figure, F
1, F
2Be two component of F.When the tangent top rake, F
2Be downward, work to hinder chip removal; When negative cutting angle, F
2Make progress, help chip removal.
Claims (1)
1. prevent the negative cutting angle PDC drill bit of mud drum, comprise bit body, wing, be installed in the some cutting teeths on the wing that the cutting face that it is characterized in that described cutting teeth is a scarf, cutting teeth is negative cutting angle and is installed on the wing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009202430719U CN201546625U (en) | 2009-11-09 | 2009-11-09 | PDC drill bit for avoiding negative cutting angles of balling |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009202430719U CN201546625U (en) | 2009-11-09 | 2009-11-09 | PDC drill bit for avoiding negative cutting angles of balling |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201546625U true CN201546625U (en) | 2010-08-11 |
Family
ID=42601799
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009202430719U Expired - Lifetime CN201546625U (en) | 2009-11-09 | 2009-11-09 | PDC drill bit for avoiding negative cutting angles of balling |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201546625U (en) |
Cited By (2)
| 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 |
| CN107023261A (en) * | 2017-06-14 | 2017-08-08 | 吉林大学 | A kind of hard slipping formation diamond compound bit and preparation method thereof |
-
2009
- 2009-11-09 CN CN2009202430719U patent/CN201546625U/en not_active Expired - Lifetime
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 |
| CN107023261A (en) * | 2017-06-14 | 2017-08-08 | 吉林大学 | A kind of hard slipping formation diamond compound bit and preparation method thereof |
| CN107023261B (en) * | 2017-06-14 | 2023-08-25 | 吉林大学 | Hard slipping stratum diamond composite drill bit and preparation method thereof |
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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: 20100811 |