CN2592843Y - Eccentric tri-cone rotary drill bit - Google Patents
Eccentric tri-cone rotary drill bit Download PDFInfo
- Publication number
- CN2592843Y CN2592843Y CN 02290357 CN02290357U CN2592843Y CN 2592843 Y CN2592843 Y CN 2592843Y CN 02290357 CN02290357 CN 02290357 CN 02290357 U CN02290357 U CN 02290357U CN 2592843 Y CN2592843 Y CN 2592843Y
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- CN
- China
- Prior art keywords
- bit
- eccentric
- gear wheel
- roller cone
- cone
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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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Abstract
The utility model relates to an eccentric roller cone bit for petroleum, mine and geologic drilling, particularly an eccentric single roller cone bit. The utility model comprises a cone leg and a roller cone, wherein, the roller cone is matched and connected with a journal of the cone leg through an inner hole of the roller cone. The utility model is characterized in that the central axis of a roller cone body and the central axis of the inner hole of the roller cone shift a distance D, and the eccentric roller cone and the journal of the cone leg are in matching connection. The utility model changes the number of cutting teeth which are arranged on the roller cone and are contacted with the bottom of a well, and the friction stroke of the cutting tooth scrape on a rock can be shortened; the roller cone bit has the rock drilling characteristics of impact, crushability and small distance scrap and squeeze, the impact rock drilling performance of the bit can be improved, the footage of the roller cone bit in the middle and the hard stratums can be increased, and the composite cost of the drilling can be lowered. On the other hand, because the biggest radius of gyration of the eccentric roller cone is enlarged, the eccentric roller cone can also have the function of enlarging the bore diameter of a well bore during the underground work. The utility model has the characteristics that the eccentric structure is simple, and the manufacture is easy.
Description
Technical field
The utility model relates to a kind of eccentric rock bit that is used for oil, mine and geological drilling, relates in particular to a kind of eccentric single-cone rotary drill bit.
Background technology
Existing rock bit as single-cone rotary drill bit, mainly is made of bit leg and gear wheel, and gear wheel is connected by its endoporus and bit leg journel.In the prior art, the central axis of cone body overlaps with the central axis of gear wheel endoporus, and promptly cone body is to rotate around self central axis relative to bit leg.The edge cover of gear wheel endoporus is that edge overlaps with one heart, this concentric cone structure stable working, but the broken rock characteristic of impacting, crushing is strong not enough, does not fit into the drilling well of hard formation.
Summary of the invention
The purpose of this utility model is to provide a kind of eccentric rock bit, makes rock bit not only possess the broken rock characteristic of stronger impact, crushing, and the while can also reach the effect of reaming.
The technical scheme that the utility model is adopted for achieving the above object is: include bit leg 1 and gear wheel 3, gear wheel is connected by its endoporus and bit leg journel 2, its difference is space D of central axis skew of the central axis and the gear wheel endoporus of cone body, and it is matched to constitute eccentric gear wheel and bit leg journel.
The beneficial effects of the utility model are: produce a skew between the eccentric gear wheel and the drill bit centre of gyration, changed the quantity of the cutting teeth in contact shaft bottom on the gear wheel, shortened the friction stroke that cutting teeth streaks on rock, made rock bit have impact, crushing and small distance and scrape crowded broken rock characteristic.This impact, crushing and small distance are scraped crowded broken rock characteristic, have improved the impact cutting lithology energy of drill bit, can increase rock bit in firmly with the drilling depth of overlying strata, reduce the integrated cost of drilling well.On the other hand, eccentric gear wheel is because the increase of the maximum radius of gyration during underground work, can also be played the effect that enlarges the well aperture.It is simple to the utlity model has eccentric structure, is easy to machining characteristics.
Description of drawings
Fig. 1 is the structure chart of facing of an embodiment of the utility model.
Fig. 2 is the F-F sectional view among Fig. 1, also is the structural representation of gear wheel off-centre.
Fig. 3 is the gear wheel eccentric structure schematic diagram that has the edge cover.
Fig. 4 is the gear wheel eccentric structure schematic diagram that not contour cutting teeth forms.
The specific embodiment
Further specify embodiment of the present utility model below in conjunction with accompanying drawing, it is a single-cone rotary drill bit, include bit leg 1, the bit leg lower end is provided with bit leg journel 2, be installed on spherical gear wheel 3 on the bit leg journel, gear wheel is matched by its endoporus and bit leg journel, the central axis A of cone body ' central axis A of gear wheel endoporus is offset a space D relatively, the value of D is 1～15mm, constituting eccentric gear wheel links to each other with bit leg, eccentric gear wheel can directly be offered the endoporus of skew and constitute on cone body, perhaps constitute eccentric gear wheel by install eccentric edge cover 5 in endoporus, as shown in Figure 3, on the spherical of gear wheel, also be installed with cutting teeth, cutting teeth is contour cutting teeth, and the central axis and the cone body central axis of the formed envelope sphere 6 of cutting teeth coincide, and depart from mutually with the central axis of gear wheel endoporus.In addition, can also be by the not contour cutting teeth of insert on the gear wheel cloth flank of tooth, the central axis of the formed envelope sphere 6 of not contour cutting teeth departs from mutually with the central axis of gear wheel endoporus, constitute eccentric gear wheel thus, matched with bit leg journel, form eccentric rock bit, as shown in Figure 4.
Eccentric rock bit of the present utility model also can be double-cone bit or tricone bit or polydonita wheel drill bit.
Claims (7)
1, a kind of eccentric rock bit, include bit leg (1) and gear wheel (3), gear wheel is connected by its endoporus and bit leg journel (2), it is characterized in that space D of central axis skew of the central axis and the gear wheel endoporus of cone body, and it is matched to constitute eccentric gear wheel and bit leg journel.
2, by the described eccentric rock bit of claim 1, it is characterized in that being a single-cone rotary drill bit, include bit leg (1), the bit leg lower end is provided with bit leg journel (2), be installed on spherical gear wheel (3) on the bit leg journel, gear wheel is matched by its endoporus and bit leg journel, and the central axis A of cone body ' central axis A of gear wheel endoporus is offset a space D relatively.
3, by claim 1 or 2 described eccentric rock bit, the value that it is characterized in that being offset space D is 1～15mm.
4,, it is characterized in that eccentric gear wheel directly offers the endoporus of skew and constitute on cone body by claim 1 or 2 described eccentric rock bit.
5,, it is characterized in that constituting eccentric gear wheel by in endoporus, installing eccentric edge cover by claim 1 or 2 described eccentric rock bit.
6, by claim 1 or 2 described eccentric rock bit, it is characterized in that the not contour cutting teeth of insert on the gear wheel cloth flank of tooth, the central axis of the formed envelope sphere of not contour cutting teeth (6) departs from mutually with the central axis of gear wheel endoporus, constitute eccentric gear wheel thus, matched with bit leg journel, form eccentric rock bit.
7,, it is characterized in that described eccentric rock bit is double-cone bit or tricone bit or polydonita wheel drill bit by the described eccentric rock bit of claim 1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02290357 CN2592843Y (en) | 2002-12-12 | 2002-12-12 | Eccentric tri-cone rotary drill bit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02290357 CN2592843Y (en) | 2002-12-12 | 2002-12-12 | Eccentric tri-cone rotary drill bit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2592843Y true CN2592843Y (en) | 2003-12-17 |
Family
ID=33749607
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 02290357 Expired - Lifetime CN2592843Y (en) | 2002-12-12 | 2002-12-12 | Eccentric tri-cone rotary drill bit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2592843Y (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103541660A (en) * | 2013-11-07 | 2014-01-29 | 西南石油大学 | Composite type eccentric one-cone bit |
| CN103711435A (en) * | 2014-01-15 | 2014-04-09 | 宜昌神达石油机械有限公司 | Crankset diamond bit for well drilling |
-
2002
- 2002-12-12 CN CN 02290357 patent/CN2592843Y/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103541660A (en) * | 2013-11-07 | 2014-01-29 | 西南石油大学 | Composite type eccentric one-cone bit |
| CN103711435A (en) * | 2014-01-15 | 2014-04-09 | 宜昌神达石油机械有限公司 | Crankset diamond bit for well drilling |
| CN103711435B (en) * | 2014-01-15 | 2016-01-06 | 宜昌神达石油机械有限公司 | A kind of drilling well chain wheel diamond bit |
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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 | ||
| CX01 | Expiry of patent term |
Expiration termination date: 20121212 Granted publication date: 20031217 |