CN201448058U - Bottom blowout stepped PDC coal fetching drill bit - Google Patents
Bottom blowout stepped PDC coal fetching drill bit Download PDFInfo
- Publication number
- CN201448058U CN201448058U CN2009200341068U CN200920034106U CN201448058U CN 201448058 U CN201448058 U CN 201448058U CN 2009200341068 U CN2009200341068 U CN 2009200341068U CN 200920034106 U CN200920034106 U CN 200920034106U CN 201448058 U CN201448058 U CN 201448058U
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- drill bit
- steel body
- coal
- pdc
- drill steel
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Abstract
The utility model discloses a bottom blowout stepped PDC coal fetching drill bit, which belongs to coal exploration core bits. The coal fetching drill bit comprises a drill bit steel body, wherein, the outer part of the drill bit steel body is stair-stepping, a large-diameter through-hole penetrates the inner part from top to bottom, an inner ring of the drill bit steel body protrudes out, cutting tools are welded on the lower end surface of the drill bit steel body and that of the outer wall step of the drill bit steel body, a gage protection hard alloy is embedded on the outer side of the step, and a bottom blowout hole is formed in the front of the cutting tools. The coal fetching drill bit provided by the utility model has the characteristics that the designs of the bottom blowout hole and the protruding inner ring avoid the direct washing of a washing fluid to the powdered coal core, thereby greatly improving the percentage recovery and quality of the coal powder core.
Description
Technical field
The utility model belongs to the geological exploration techniques field, relates to a kind of coal exploration fine coal core bit, particularly relates to a kind of end spray staged PDC and gets Coal drill bit.
Background technology
When creeping into the coal seam in coal exploration, the quantity that is retained in the coal heart in the basket is often represented with coal core recovery percentage.Traditional fine coal core bit, the problem that exists flushing liquor that the fine coal heart is directly washed away during use, thus reduced the taking rate and the fine coal heart quality of the fine coal heart greatly.
The utility model content
The purpose of this utility model is to overcome above-mentioned deficiency of the prior art, provides a kind of flushing liquor of can avoiding that the fine coal heart is directly washed away, and improves the taking rate of the fine coal heart and the end spray staged PDC of fine coal heart quality greatly and gets Coal drill bit.
For achieving the above object, the technical solution adopted in the utility model is: it comprises the drill steel body, it is characterized in that: described drill steel external body is stepped, the inner diameter through hole that runs through that from top to bottom is provided with, described drill steel body inner ring stretches out, the external wall step of drill steel body lower surface and drill steel lower surface all is welded with cutting element, and the step outside is inlaid with protects the footpath carbide alloy, and described cutting element the place ahead is provided with end water spray eye.
Described cutting element is composite polycrystal-diamond PDC.
The utility model compared with prior art has the following advantages: the drill bit inner ring stretches out and the design of end water spray eye, has avoided flushing liquor to directly the washing away of the fine coal heart, and has improved the taking rate and the fine coal heart quality of the fine coal heart greatly.
Below by drawings and Examples, the technical solution of the utility model is described in further detail.
Description of drawings
Fig. 1 is a structural representation of the present utility model.
Description of reference numerals:
1-drill steel body; The 2-cutting element; Water spray eye at the bottom of the 3-;
The 4-diameter through hole; The 5-carbide alloy.
The specific embodiment
As shown in Figure 1, the utility model comprises drill steel body 1, described drill steel body 1 outside is stepped, the inner diameter through hole 4 that runs through that from top to bottom is provided with, described drill steel body 1 inner ring stretches out, drill steel body 1 lower surface and drill steel body 1 outer wall step lower surface all are welded with cutting element 2, and the step outside is inlaid with protects footpath carbide alloy 5, and described cutting element 2 the place aheads are provided with end water spray eye 3.
Described cutting element 2 is to be micron-sized diamond particles with after metal dusts such as Co, Ni evenly mix by granularity for composite polycrystal-diamond PDC. composite polycrystal-diamond PDC, under high-temperature and high-pressure conditions, at the last synthetic a kind of new material of tungsten carbide (WC) substrate. because composite polycrystal-diamond PDC has the following advantages: 1. have very high hardness and intensity, its hardness is only second to natural diamond, and its hardness is consistent in all directions with abrasion resistance, need not select to. its intensity because the higher carbide alloy of flexible supports its compound flexural strength σ
bCan reach 1500MPa.2. have very high abrasion resistance, its abrasion resistance is generally 60～80 times of carbide alloy.When the higher nonmetals of cutting hardness, its tool life is high.3. have lower friction factor, the friction factor of composite polycrystal-diamond PDC and cutting material is 1/3～1/2 of carbide alloy and a cutting material friction factor.When using the PDC cutter, can reduce cutting force and cutting degree about 1/3～1/2.4. have very high thermal conductivity, the coefficient of thermal conductivity of composite polycrystal-diamond PDC is 1.5～7 times of carbide alloy.Can reduce the temperature of cutting region when using the PDC cutter greatly, improve tool life.So, when using composite polycrystal-diamond PDC as the bit cutting tool, the bit cutting tool not only has superior functions such as adamantine high rigidity, high-wearing feature, high-termal conductivity, low-friction coefficient, low thermal coefficient of expansion, also have good intensity of carbide alloy and toughness simultaneously, its application life big leap ahead.
During use, drill bit is screwed on the rock core outer tube, when drill bit creeps into fine coal, because the drill bit inner ring stretches out and the design of end water spray eye, flushing liquor is flowed between inside and outside basket, flow out from end water spray eye, avoided flushing liquor that the fine coal heart is directly washed away, improve the taking rate and the fine coal heart quality of the fine coal heart greatly.
The above; it only is preferred embodiment of the present utility model; be not that the utility model is imposed any restrictions; every according to the utility model technical spirit to any simple modification, change and equivalent structure transformation that above embodiment did, all still belong in the protection domain of technical solutions of the utility model.
Claims (2)
1. spray staged PDC Coal drill bit at the bottom of a kind, comprise drill steel body (1), it is characterized in that: described drill steel body (1) is outside stepped, the inner diameter through hole (4) that runs through that from top to bottom is provided with, described drill steel body (1) inner ring stretches out, drill steel body (1) lower surface and drill steel body (1) outer wall step lower surface all are welded with cutting element (2), and the step outside is inlaid with protects footpath carbide alloy (5), and described cutting element (2) the place ahead is provided with end water spray eye (3).
2. get Coal drill bit according to the described end spray of claim 1 staged PDC, it is characterized in that: described cutting element (2) is composite polycrystal-diamond PDC.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009200341068U CN201448058U (en) | 2009-08-04 | 2009-08-04 | Bottom blowout stepped PDC coal fetching drill bit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009200341068U CN201448058U (en) | 2009-08-04 | 2009-08-04 | Bottom blowout stepped PDC coal fetching drill bit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201448058U true CN201448058U (en) | 2010-05-05 |
Family
ID=42552773
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009200341068U Expired - Fee Related CN201448058U (en) | 2009-08-04 | 2009-08-04 | Bottom blowout stepped PDC coal fetching drill bit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201448058U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103510861A (en) * | 2013-10-09 | 2014-01-15 | 无锡中地地质装备有限公司 | Stepped drill bit for exploration drilling |
| CN105041219A (en) * | 2015-08-27 | 2015-11-11 | 淮北矿业（集团）勘探工程有限责任公司 | Large-caliber stepped combined drill |
| CN112112575A (en) * | 2020-09-17 | 2020-12-22 | 中煤科工集团西安研究院有限公司 | Garrulous soft coal seam airtight coring bit suitable for ground drilling |
-
2009
- 2009-08-04 CN CN2009200341068U patent/CN201448058U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103510861A (en) * | 2013-10-09 | 2014-01-15 | 无锡中地地质装备有限公司 | Stepped drill bit for exploration drilling |
| CN105041219A (en) * | 2015-08-27 | 2015-11-11 | 淮北矿业（集团）勘探工程有限责任公司 | Large-caliber stepped combined drill |
| CN112112575A (en) * | 2020-09-17 | 2020-12-22 | 中煤科工集团西安研究院有限公司 | Garrulous soft coal seam airtight coring bit suitable for ground drilling |
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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: 20100505 Termination date: 20100804 |