CN201050307Y - Low erosion coring bit - Google Patents
Low erosion coring bit Download PDFInfo
- Publication number
- CN201050307Y CN201050307Y CNU2007200123026U CN200720012302U CN201050307Y CN 201050307 Y CN201050307 Y CN 201050307Y CN U2007200123026 U CNU2007200123026 U CN U2007200123026U CN 200720012302 U CN200720012302 U CN 200720012302U CN 201050307 Y CN201050307 Y CN 201050307Y
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- CN
- China
- Prior art keywords
- core
- grabber
- bit
- seat
- bit body
- Prior art date
- 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 - Fee Related
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Abstract
The utility model relates to a low-erosion coring bit, which is composed of an inner cylinder, an outer cylinder, a connecting sleeve, a core grabber, a core grabber seat and a bit body. Inside the outer cylinder, an inner cylinder is provided. A connecting sleeve is arranged between the inner and outer cylinders so that both of them can be connected. The lower end of the outer cylinder is linked with a bit body through a thread, and the lower end of the inner cylinder is linked with the core grabber seat through a thread. The core grabber is arranged inside the core grabber seat. Such coring bit has an innovative structure with reliable performance, in which the erosion force of the drilling fluid to the core can be greatly reduced and in favour of the enhancement of the yield of the core of the loose formation.
Description
Technical field:
The utility model relates to a kind of particularly down-hole coring tool of loose soft formation of oil, gas drilling engineering that is used for.
Background technology:
Coring is an important flow chart of oil, gas drilling engineering.At present, the on-the-spot core bit that uses is that carbide alloy or diamond (containing PDC) drill bit all have bigger interior washing lotion runner, and hydrophthalmia outlet is near cutting position, shaft bottom, thereby the erosion effect that rock core is all had stronger wash-in and washout when creeping into.Under this stronger erosion effect, the unconsolidated core of scall just can be flushed away in advancing a process, the yield rate of rock core is caused have a strong impact on.
The utility model content:
The purpose of this utility model be to provide a kind of can scall creep into reduce significantly in the process of coring drilling fluid to the erosive force of rock core, help improving the low erosion core bit of core recovery.
The utility model is to realize like this.
This kind core bit is made up of inside and outside tube, adapter sleeve, core grabber, core grabber seat, bit body, is provided with inner core in the urceolus, is provided with adapter sleeve therebetween the two is connected, and the urceolus lower end is connected with bit body with screw thread; The inner core lower end is connected with the core grabber seat with screw thread, is provided with core grabber in the core grabber seat.After the assembling of this kind core bit, insert in " U " shape vallecular cavity of bit body inner chamber bottom the core grabber wall bottom of inner core, because " U " shape vallecular cavity has enough width, when flowing through, liquid stream can reduce eddy current as far as possible, in the circulation of drilling fluid process, the annular gap guided drilling liquid that bit body inner chamber and core grabber base form directly rushes at the shaft bottom with outward-dipping 15 directions of spending the oblique hydrophthalmia from bit body, avoid the problem of drilling fluid erosion rock core from the inside and outside both direction, thereby helped improving the scall core recovery.
The utility model novel structure, reliable operation utilizes it can reduce the erosive force of drilling fluid to rock core significantly, helps improving the core recovery of scall.
Description of drawings:
Accompanying drawing is a structural representation of the present utility model.
The specific embodiment:
The utility model is provided by following examples, is illustrated below in conjunction with accompanying drawing.
As shown in the figure, the utility model is made up of urceolus 1, inner core 2, adapter sleeve 3, core grabber seat 4, core grabber 5 and bit body 6, its structure, assembled relation are as follows: be provided with inner core 2 in the urceolus 1, be provided with adapter sleeve 3 therebetween the two is connected, urceolus 1 lower end is connected with bit body 6 with screw thread; Inner core 2 lower ends are connected with core grabber seat 4 with screw thread, are provided with core grabber 5 in the core grabber seat 4.Wherein, bit body 6 inner chambers are " U " shape groove shape, and core grabber seat 4 lower ends place in this vallecular cavity, play drainage and block the effect that drilling fluid washes, and bit body 6 lower ends are provided with the oblique hydrophthalmias 7 of outward-dipping 15 degree, make liquid stream can not directly wash away rock core.
Claims (2)
1. one kind low erosion core bit, form by urceolus (1), inner core (2), adapter sleeve (3), core grabber seat (4), core grabber (5) and bit body (6), it is characterized in that: be provided with inner core (2) in the urceolus (1), be provided with adapter sleeve (3) therebetween the two is connected; Urceolus (1) lower end is connected with bit body (6) with screw thread, and inner core (2) lower end is connected with core grabber seat (4) with screw thread, is provided with core grabber (5) in the core grabber seat (4).
2. low erosion core bit according to claim 1, it is characterized in that: bit body (6) inner chamber is " U " shape groove shape, core grabber seat (4) lower end places in this vallecular cavity, play drainage and block the effect that drilling fluid washes, bit body (6) lower end is provided with the oblique hydrophthalmias (7) of outward-dipping 15 degree.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007200123026U CN201050307Y (en) | 2007-05-22 | 2007-05-22 | Low erosion coring bit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007200123026U CN201050307Y (en) | 2007-05-22 | 2007-05-22 | Low erosion coring bit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201050307Y true CN201050307Y (en) | 2008-04-23 |
Family
ID=39336791
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2007200123026U Expired - Fee Related CN201050307Y (en) | 2007-05-22 | 2007-05-22 | Low erosion coring bit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201050307Y (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116104421A (en) * | 2023-04-04 | 2023-05-12 | 成都迪普金刚石钻头有限责任公司 | PDC mixed-inlaid drill bit suitable for coring of hard broken stratum |
-
2007
- 2007-05-22 CN CNU2007200123026U patent/CN201050307Y/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116104421A (en) * | 2023-04-04 | 2023-05-12 | 成都迪普金刚石钻头有限责任公司 | PDC mixed-inlaid drill bit suitable for coring of hard broken stratum |
| CN116104421B (en) * | 2023-04-04 | 2023-06-20 | 成都迪普金刚石钻头有限责任公司 | PDC mixed-inlaid drill bit suitable for coring of hard broken stratum |
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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 | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20080423 Termination date: 20110522 |