CN204082011U - The concentric reaming while drilling drill bit of single cone PDC - Google Patents
The concentric reaming while drilling drill bit of single cone PDC Download PDFInfo
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- CN204082011U CN204082011U CN201420439785.8U CN201420439785U CN204082011U CN 204082011 U CN204082011 U CN 204082011U CN 201420439785 U CN201420439785 U CN 201420439785U CN 204082011 U CN204082011 U CN 204082011U
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Abstract
The utility model relates to the concentric reaming while drilling drill bit of a kind of single cone PDC for oil, natural gas probing, comprises PDC drill bit and single-cone rotary drill bit.Described single-cone rotary drill bit is pilot bit, and PDC drill bit is re-drill bit; The axis of rotation of single-cone rotary drill bit overlaps with the axis of rotation of PDC drill bit.The utility model is owing to utilizing single-cone rotary drill bit at the rate of penetration of slim-hole higher than the advantage of PDC drill bit, concentric reaming while drilling technology is combined with the efficient rock-breaking structure of single-cone rotary drill bit, form the concentric reaming while drilling drill bit of single cone PDC, expand the range of application of single-cone rotary drill bit in the drilling well of deep formation large-size well, and improve the rate of penetration of concentric reaming while drilling drill bit simultaneously.
Description
Technical field
The utility model relates to a kind of oil, natural gas probing reaming while drilling drill bit, the particularly concentric reaming while drilling drill bit of a kind of single cone PDC.
Background technology
Drill bit is as conventional downhole tool a kind of in oil, natural gas extraction industry.Reaming while drilling technology is a drilling well new technology of rising in recent years, and what it adopted is, and principle is expanded on brill limit, reaming while drilling instrument limit, finally realizes borehole size larger than pilot bit size, to widen the view the object of size, increase completion size to reach reduction.At present, in order to coordinate the application of bulged tube technology and unconventional well depth structure, reaming while drilling technical development is rapid with one heart abroad.It is by two aspect factor controllings that concentric reaming while drilling can improve drilling speed, and one is that reaming hole step place rock stress is concentrated, easily broken; Two is that pilot bit is less, can obtain enough mechanical energies.Therefore under identical shaft bottom area, adopt reaming while drilling technology to creep into effective than directly adopting the drill bit of large-size.
Drill bit is the principal element affecting deep formation drilling machinery drilling speed, the drill bit that present deep formation drilling well is commonly used has tricone bit, PDC drill bit and single-cone rotary drill bit, wherein the distinct disadvantage of tricone bit is that bearing life is little, it is mainly scraped crowded mode by impact, crushing and small distance and breaks rock, the tooth number change in bit contact shaft bottom greatly, tooth discontinuity, bearing life is short; PDC drill bit is due to the restriction of structure and operating principle, and not only operation moment of torsion is large, the flushing of tooth and cooling difficulty, and the sensitiveness of its formation lithology is comparatively strong, is not suitable for creeping into gravel stratum and the staggered stratum of soft or hard; Single cone is more suitable for the simultaneously all large stratum of plasticity and intensity than tricone bit, and be suitable for again hard interbedded layer that PDC drill bit is difficult to tackle and other bad ground, and structure is simple, bearing space is large, safe and reliable simultaneously.
The pilot bit (drill bit that external diameter is less) that in prior art, concentric reaming while drilling drill bit uses is PDC drill bit, poor to the compliance of the bad ground in deep, but rate of penetration is higher unstable, and application life is shorter.But due to the advantage that limitation and the single-cone rotary drill bit of single-cone rotary drill bit manufacturing technology level creep in slim-hole, present single-cone rotary drill bit external diameter is all less, be generally 4-1/8 cun to 7 cun (104.8mm-177.8mm).At deep formation big hole, borehole size is that 8-1/2 is very little to 10 cun (215.9mm-254mm), directly can't use single-cone rotary drill bit, limit the application of single-cone rotary drill bit at big hole.
Utility model content
For the above-mentioned shortcoming existed in prior art, the purpose of this utility model is to provide the concentric reaming while drilling drill bit of single cone PDC, concentric reaming while drilling technology is combined with the efficient rock-breaking structure of single-cone rotary drill bit, expand the range of application of single-cone rotary drill bit in the drilling well of deep formation large-size well, and improve the rate of penetration of concentric reaming while drilling drill bit simultaneously.
For achieving the above object, the utility model adopts following technical scheme: the concentric reaming while drilling drill bit of single cone PDC of the present utility model, comprise PDC drill bit and single-cone rotary drill bit, it is characterized in that: single-cone rotary drill bit is pilot bit, PDC drill bit is re-drill bit, and the axis of rotation of wherein said single-cone rotary drill bit overlaps with the axis of rotation of PDC drill bit.Single-cone rotary drill bit creeps into fractured rock and obtains the less well of internal diameter, and PDC drill bit creeps into the well of being crept into by single-cone rotary drill bit and expands.
Owing to having single-cone rotary drill bit as the existence of pilot bit, the hydraulic structure space for the PDC drill bit of jet drilling liquid, cooling PDC drill bit chip tooth and flushing manhole bed rock bits is affected.Therefore chip area between PDC drill bit adjacent blades is all evenly provided with a fixing hydrophthalmia.Fixing hydrophthalmia is compared with adjustable movable hydrophthalmia, and fixing space shared by hydrophthalmia is less, and for the hydrophthalmia of same internal diameter, the external diameter of conventional adjustable movable hydrophthalmia is 25-27mm, and the size of fixing hydrophthalmia is generally at below 15mm.As preferably, the internal diameter of described fixing hydrophthalmia is 8-15mm.
In technique scheme, the bit body of single-cone rotary drill bit can be threaded connection and be fixed on PDC drill bit; In order to increase the bonding strength of single-cone rotary drill bit and PDC drill bit, use the U-shaped groove of the gas shielded arc welding welding bit body of single-cone rotary drill bit and the crossing formation of the chip area of PDC drill bit simultaneously.
As the further improvement of the above-mentioned concentric reaming while drilling drill bit of the utility model, the bit body of described single-cone rotary drill bit becomes to be integrated with PDC drill bit, is monolithic construction, without the need to again with being threaded, reduces because of the shaft bottom accident risk lost efficacy that is threaded.
Usual single-cone rotary drill bit can obtain than tricone bit and the higher rate of penetration of PDC drill bit in slim-hole is crept into, and has higher stratum adaptive capacity.The stock size of existing slim-hole is 4-1/8 cun, 5-7/8 cun, 6 cun, 6-1/2 cun or 6-5/8 cun.Therefore be that 4-1/8 is cun to 7 cun (104.8mm-177.8mm) as the single-cone rotary drill bit external diameter of pilot bit in the concentric reaming while drilling drill bit of the utility model.Further, as preferably, the external diameter of described single-cone rotary drill bit is 4-1/8 cun, 5-7/8 cun, 6 cun, 6-1/2 cun or 6-5/8 cun.
Well that single-cone rotary drill bit bores by PDC drill bit expands, the big hole of usual deep formation be of a size of 8-1/2 cun, 8-3/4 cun, 9-1/2 cun, 9-7/8 cun or 10 cun.Therefore be 8-1/2 cun-10 cun (215.9mm-254mm) as the PDC outside diameter of re-drill bit in the concentric reaming while drilling drill bit of the utility model.Further, as preferably, the external diameter of described PDC drill bit is 8-1/2 cun, 8-3/4 cun, 9-1/2 cun, 9-7/8 cun or 10 cun.
Therefore, in technique scheme, single cone PDC of the present utility model concentric reaming while drilling drill bit beneficial effect is: adopt concentric reaming while drilling technology, undersized single-cone rotary drill bit is applied in the drilling engineering of deep formation big size hole, add the compliance of drill bit formation, improve rate of penetration simultaneously.
Accompanying drawing explanation
Fig. 1 is the structural representation of the first embodiment of the utility model.
Fig. 2 is the structural representation of the PDC drill bit of the first embodiment of the utility model.
Structural representation when Fig. 3 is the first embodiment of the utility model unassembled gear wheel.
Fig. 4 is the sectional view of the utility model the second embodiment.
Fig. 5 is three-dimensional appearance figure of the present utility model.
Fig. 6 is the top view of Fig. 5.
Mark in figure: 1-PDC drill bit, 2-single-cone rotary drill bit, 3-connecting thread, 4-U type groove, 11-wing, 12-chip area, 13-fix the link screw thread of hydrophthalmia, the bit body of 21-single-cone rotary drill bit, 22-gear wheel, 31-PDC drill bit.
Detailed description of the invention
In order to make the purpose of this utility model, technical scheme and advantage clearly understand, below in conjunction with drawings and Examples, the utility model is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the utility model, and be not used in restriction invention.
The structure of the first embodiment of the concentric reaming while drilling drill bit of the utility model single cone PDC as shown in Figure 1, this concentric reaming while drilling drill bit comprises PDC drill bit 1 and single-cone rotary drill bit 2, described single-cone rotary drill bit 2 is pilot bit, PDC drill bit 1 is re-drill bit, the radius of gyration of PDC drill bit 1 is greater than the radius of gyration of single-cone rotary drill bit 2, and the axis of rotation of PDC drill bit 1 overlaps with the axis of rotation of single-cone rotary drill bit 2.
In order to be connected and fixed PDC drill bit 1 and single-cone rotary drill bit 2, as shown in Figure 2, PDC drill bit 1 top is provided with connecting thread 31, for being fixedly connected with single-cone rotary drill bit 2.As shown in Figure 3, in order to strengthen the bonding strength between single-cone rotary drill bit 2 and PDC drill bit 1, use the U-shaped groove 4 of the gas shielded arc welding welding bit body 21 of single-cone rotary drill bit 2 and the crossing formation of the chip area 12 of PDC drill bit 1.Concentric reaming while drilling drill bit of the present utility model is adopted to the structure of the first embodiment, need to carry out machining to the bit body 21 of PDC drill bit 1 and single-cone rotary drill bit 2 respectively, then fit together, the structure after assembling as shown in Figure 3.
As shown in Figure 2, the hydraulic structure indicating PDC drill bit in the concentric reaming while drilling drill bit of the utility model of signal.Chip area 12 between PDC drill bit 1 adjacent blades 11 is all evenly provided with a fixing hydrophthalmia 13.Fixing hydrophthalmia 13 is compared with adjustable movable hydrophthalmia, and fixing space shared by hydrophthalmia 13 is less, and for the hydrophthalmia of same internal diameter, the external diameter of conventional adjustable movable hydrophthalmia is 25-27mm, and the size of fixing hydrophthalmia is generally at below 15mm.Therefore, as preferably, the internal diameter of described fixing hydrophthalmia 13 is 8-15mm.
As shown in Figure 4, be that concentric the first embodiment of reaming while drilling drill bit of the utility model is further improved, reduce PDC drill bit 1 with single-cone rotary drill bit 2 because Joint failure causes the risk of shaft bottom accident.Therefore, as the second embodiment of the present utility model by as a whole by being machined into for the bit body 21 of PDC drill bit 1 and single-cone rotary drill bit 2, without the need to again with being threaded, improve the bulk strength of drill bit, finally only needing gear wheel 22 to be assembled on bit body 21.
As shown in Figure 5 and Figure 6, wherein the external diameter of PDC drill bit 1 is greater than the external diameter of single-cone rotary drill bit 2 to the overall structure of the concentric reaming while drilling drill bit of the utility model single cone PDC, and described PDC drill bit 1 external diameter is that 8-1/2 is very little to 10 cun (215.9mm-254mm).Further, as preferably, the external diameter of described PDC drill bit 1 is 8-1/2 cun, 8-3/4 cun, 9-1/2 cun, 9-7/8 cun or 10 cun.The external diameter of described single-cone rotary drill bit 2 is that 4-1/8 is very little to 7 cun (104.8mm-177.8mm).Further, as preferably, the external diameter of described single-cone rotary drill bit 2 is 4-1/8 cun, 5-7/8 cun, 6 cun, 6-1/2 cun or 6-5/8 cun.
Adopt the concentric reaming while drilling drill bit of single cone PDC of the above-mentioned embodiment of the utility model, expand the range of application of single-cone rotary drill bit in the drilling well of deep formation large-size well, and improve the rate of penetration of concentric reaming while drilling drill bit simultaneously.Those of ordinary skill in the art will be appreciated that, above embodiment is only used to the utility model is described, and be not used as restriction of the present utility model, as long as in spirit of the present utility model, all will drop in Claims scope of the present utility model the change of the above embodiment, modification.
Claims (8)
1. the concentric reaming while drilling drill bit of single cone PDC, comprise PDC drill bit (1) and single-cone rotary drill bit (2), it is characterized in that: single-cone rotary drill bit (2) is pilot bit, PDC drill bit (1) is re-drill bit; The axis of rotation of wherein said single-cone rotary drill bit (2) overlaps with the axis of rotation of PDC drill bit (1).
2. the concentric reaming while drilling drill bit of single cone PDC according to claim 1, it is characterized in that: described PDC drill bit (1) is provided with several wing (11), be provided with chip area (12) between described wing (11), wherein on each chip area (12), be provided with a fixing hydrophthalmia (13); The internal diameter of wherein said fixing hydrophthalmia is 8-15mm.
3. the concentric reaming while drilling drill bit of single cone PDC according to claim 1, is characterized in that: the bit body (21) of described single-cone rotary drill bit (2) is fixedly connected on PDC drill bit (1) by screw thread (3); And the U-shaped groove (4) of the bit body (21) of single-cone rotary drill bit (2) and the crossing formation of the chip area (12) of PDC drill bit is welded with gas shielded arc welding.
4. the concentric reaming while drilling drill bit of single cone PDC according to claim 1, is characterized in that: the bit body (21) of described single-cone rotary drill bit (2) becomes to be integrated with PDC drill bit, is monolithic construction.
5. the concentric reaming while drilling drill bit of single cone PDC according to claim 1, is characterized in that: the external diameter of described single-cone rotary drill bit (2) is that 4-1/8 is very little to 7 cun.
6. the concentric reaming while drilling drill bit of single cone PDC according to claim 1, is characterized in that: the external diameter of described single-cone rotary drill bit (2) is 5-7/8 cun, 6 cun, 6-1/2 is very little or 6-5/8 is very little.
7. the concentric reaming while drilling drill bit of single cone PDC according to claim 1, is characterized in that: the external diameter of described PDC drill bit (1) is 8-1/2 cun-10 cun.
8. the concentric reaming while drilling drill bit of single cone PDC according to claim 1, is characterized in that: the external diameter of described PDC drill bit (1) is 8-1/2 cun, 8-3/4 cun, 9-1/2 cun, 9-7/8 cun or 10 cun.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420439785.8U CN204082011U (en) | 2014-08-06 | 2014-08-06 | The concentric reaming while drilling drill bit of single cone PDC |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420439785.8U CN204082011U (en) | 2014-08-06 | 2014-08-06 | The concentric reaming while drilling drill bit of single cone PDC |
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| Publication Number | Publication Date |
|---|---|
| CN204082011U true CN204082011U (en) | 2015-01-07 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420439785.8U Expired - Fee Related CN204082011U (en) | 2014-08-06 | 2014-08-06 | The concentric reaming while drilling drill bit of single cone PDC |
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| CN (1) | CN204082011U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104131785A (en) * | 2014-08-06 | 2014-11-05 | 四川万吉金刚石钻头有限公司 | Single-cone PDC concentric RWD drill bit |
| CN113216849A (en) * | 2021-05-27 | 2021-08-06 | 河北锐石钻头制造有限公司 | Single-cone PDC concentric reaming-while-drilling bit |
-
2014
- 2014-08-06 CN CN201420439785.8U patent/CN204082011U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104131785A (en) * | 2014-08-06 | 2014-11-05 | 四川万吉金刚石钻头有限公司 | Single-cone PDC concentric RWD drill bit |
| CN113216849A (en) * | 2021-05-27 | 2021-08-06 | 河北锐石钻头制造有限公司 | Single-cone PDC concentric reaming-while-drilling bit |
| CN113216849B (en) * | 2021-05-27 | 2022-03-18 | 河北锐石钻头制造有限公司 | Single-cone PDC concentric reaming-while-drilling bit |
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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: 20150107 Termination date: 20190806 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |