CN2727379Y - Low resistance diamond bit for stratigraphic drilling - Google Patents
Low resistance diamond bit for stratigraphic drilling Download PDFInfo
- Publication number
- CN2727379Y CN2727379Y CN 200420064863 CN200420064863U CN2727379Y CN 2727379 Y CN2727379 Y CN 2727379Y CN 200420064863 CN200420064863 CN 200420064863 CN 200420064863 U CN200420064863 U CN 200420064863U CN 2727379 Y CN2727379 Y CN 2727379Y
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- pad
- gauge
- gauge pad
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Abstract
The utility model relates to a low resistance diamond bit for stratigraphic drilling, which comprises a bit body and a waterpower framework. A cutting tooth and a diameter-maintainer tooth are arranged on the lower end of the bit body; blocky diameter-maintainer pad is arranged above the diameter-maintainer tooth along the circumference of the bit body. The differences are that the blocky diameter-maintainer pad is partly or totally the short diameter-maintainer pad, the axial length of which is maller than the total length of the diameter-maintainer pad; or the inner part of the blocky diameter-maintainer pad is provided with the diameter-maintainer pad with minor diameter, the radius of which is smaller than a half of the bit nominal diameter. The beneficial effects of the utility model are that under the condition of keeping the total length of the diameter-maintainer pads constant, through the provided short diameter-maintainer pads and the diameter-maintainer pads with the minor diameter, the contact faces of the diameter-maintainer pads and the borehole wall are made to be decreased, and the contact drag correspondingly cut down. In this way, the diamond bit can not only keep stronger diameter-maintainer ability, but also the rotational drag between the diameter-maintainer pad and the borehole wall is decreased, and thus the operation torque of the diamond bit can be effectively lowered, and the goals of saving energy consumption, improving drilling efficiency, and lowering the drilling integrated cost can be obtained.
Description
Technical field
The utility model relates to a kind of diamond bit that strata drilling is used that is used for.
Background technology
In recent years, diamond bit has obtained using widely in the strata drilling engineering.Diamond bit is made up of bit body, cutting teeth, gauge pad and hydraulic structure etc., and it is with contacting of formation rock its generation extruding and shearing rock stratum to be come fractured rock by its cutting teeth.For prevent drill bit in when work because the wearing and tearing of formation rock cause bit diameter to dwindle, i.e. so-called " undergauge " is furnished with the gauge teeth of some in the outside of drill bit, the while directly fills up the guarantor of drill bit and is furnished with wear-resisting, impact-resistant inserting.
Usually diamond bit moment of torsion when work is bigger, in serious situation even can cause the stall of mud motor.This is because diamond bit mainly is by the shear action fractured rock on the one hand, the circumferential shearing force that produces in the course of work reacts on drill bit makes it produce bigger moment of torsion, because the area of this bit gauge protection face is generally all bigger on the other hand, can produce bigger rotational resistance when the coarse borehole wall contacts, thereby the moment of torsion of drill bit work is increased.Too high drill bit operation torque can increase the drilling tool load, reduces the rig life-span, also may trigger down-hole accident simultaneously, so how the continuous research of people can effectively reduce the operation torque of diamond bit.
In order to reach this purpose, a kind of mode commonly used is to improve the cloth tooth mode of drill bit.For example increase the back rake angle of cutting teeth, design " cushion blocking " that can limit cutting teeth incision depth of stratum at the cutting teeth rear, perhaps increase the layout density of cutting teeth, or the like.These methods all are to reach the purpose that reduces torque-on-bit to a certain extent by the workload in the unit interval that reduces cutting teeth, but this is to be cost with the operating efficiency of sacrificing cutting teeth, a lot of be during the engineering of first demand is used with rate of penetration, whether this method desirable is to be worth discussion.
Another mode is the spin friction resistance that produces when reducing drill bit work, thereby reduces the rotation torque of drill bit.In order to reach this purpose, a kind of the most common structure is exactly that so-called " low friction resistance " protects the footpath pad, the guarantor that the key of this structure is at drill bit directly fills up wear-resisting, impact-resistant the inserting of flat edge, hard alloy blocks for example, pass through mechanical processing tools then, for example protect the footpath pad, make smooth surface, thereby reach the effect that reduces to protect footpath pad and the friction of the borehole wall with grinding machine.But on-the-spot the use shows, this structure can only guarantee the gauge ability of drill bit, thereby reduce the effect of moment of torsion and be difficult to reach reduce to rub, because gauge pad surface was under the long-term corrasion of rock of borehole when drill bit was worked in the shaft bottom, its surface just becomes very coarse after often using a period of time, and reverse side has increased friction.Another kind of structure is to adopt the method for so-called " segmented " gauge, namely design the part of different-diameter at same gauge pad, a gauge is divided into some sections that vary in size, reduced so the most at the beginning contact area of gauge pad and the borehole wall, can play the effect of certain reduction spin friction moment of torsion, Chinese patent 93214106 has been described this method.But the shortcoming one of this method is to be after the bit gauge protection pad may wear to a certain degree, it is the same that the each several part diameter of gauge pad just becomes, it just becomes the same with common drill bit high with the contact resistance of the borehole wall, the 2nd, the gauge pad limited length of drill bit, can only reduce the length of drill bit nominal diameter section gauge pad (being first order gauge) for the purpose that reaches " segmentation ", reduced so on the contrary the initial gauge ability of drill bit, the possibility that " undergauge " phenomenon takes place is improved greatly.
Summary of the invention
Technical problem to be solved in the utility model is to provide a kind of to the further improved lower resistance diamond bit for strata drilling of gauge structure for the deficiency of above-mentioned present technology existence, it not only makes drill bit maintain stronger gauge ability, and can reduce rotational resistance between gauge pad and the borehole wall, thereby reduce the operation torque of diamond bit.
The utility model is that the technical scheme that the problem of the above-mentioned proposition of solution adopts is: include bit body 6 and hydraulic structure 4, the lower end of bit body is laid with cutting teeth 1 and gauge teeth 2, circumferentially be installed on block gauge pad along bit body above gauge teeth, its difference is that described block gauge pad partly or entirely is the short gauge pad 3 of axial length less than gauge pad length overall.
Press such scheme, described whole gauge pad is short gauge pad, the length of every short gauge pad equals 1/2～2/3 gauge pad length overall L, and each short gauge pad is along the up and down interlaced arrangement laying of bit body week, be the up and down staggered transposition laying in gauge pad length overall scope of each adjacent short gauge pad, the upper the next two gauge pads up and down maximum axial spacing of two ends are gauge pad length overall L.
Press such scheme, described part gauge pad is short gauge pad, and the gauge pad of remaining part is the gauge pad that axial length equals total gauge pad length, and short gauge pad and gauge pad are laid along the circumferential interlaced arrangement of bit body, and namely length is laid staggeredly.
Second technical scheme that technical problem adopted that the utility model proposes for solution is: include bit body 6 and hydraulic structure 4, the lower end of bit body is laid with cutting teeth 1 and gauge teeth 2, circumferentially be installed on the block footpath of protecting along bit body and fill up above gauge teeth, its difference is that described block guarantor is provided with the path guarantor footpath pad of radius less than 1/2 drill bit nominal diameter in the pad of footpath.
Press such scheme, the radius of described path gauge pad is 0.5～5 millimeter less than the amount of 1/2 drill bit nominal diameter, is generally 1～3 millimeter.Described path gauge pad can be the radius of whole section gauge pad less than 1/2 drill bit nominal diameter; Or be the radius of 1/3～2/3 segmentation of gauge pad less than 1/2 drill bit nominal diameter, the radius of remaining section equals the segmented path gauge pad of 1/2 drill bit nominal diameter.
Press such scheme, the gauge pad of circumferentially laying at bit body is segmented path gauge pad, and segmented path gauge pad lays along circumferential interlaced arrangement, namely first path down, second path is upwards.
Press such scheme, a gauge pad part of circumferentially laying at bit body is path gauge pad, and path gauge pad and gauge pad are laid along circumferential interlaced arrangement.
Press such scheme, described gauge pad and/or path gauge pad can be axial length less than the short gauge pad of total gauge pad length, and described short gauge pad equals 1/2～2/3 gauge pad length overall; Short gauge pad along bit body week up and down interlaced arrangement lay, namely each adjacent short gauge pad in gauge pad length overall scope up and down staggered transposition lay, wherein go up the next two gauge pads up and down the maximum axial spacing of two ends be gauge pad length overall L.Also can lack gauge pad and gauge pad and lay along the circumferential interlaced arrangement of bit body, be i.e. the staggered laying that combines of length.
The beneficial effects of the utility model are keeping in the constant situation of gauge pad length overall, by short gauge pad and path gauge pad are set, the contact-making surface of gauge pad and the borehole wall is reduced, the corresponding minimizing of contact resistance so not only makes diamond bit can keep stronger gauge ability, and has reduced the rotational resistance between gauge pad and the borehole wall, thereby effectively reduce the operation torque of diamond bit, reach the saving energy consumption, improve drilling efficiency, reduce the purpose of drilling well integrated cost.
Description of drawings
Fig. 1 is the positive view of an embodiment of the utility model.
Fig. 2 is the positive view of second embodiment of the utility model.
Fig. 3, Fig. 4 are the positive view of the 3rd embodiment of the utility model.
Fig. 5 is the positive view of the 4th embodiment of the utility model.
Fig. 6 is the positive view of the 5th embodiment of the utility model.
The specific embodiment
Further specify embodiment of the present utility model below in conjunction with accompanying drawing.
First embodiment as shown in Figure 1, include bit body 6 and hydraulic structure 4, be laid with cutting teeth 1 and gauge teeth 2 at the lower end of bit body bizet, above gauge teeth, circumferentially be installed on the up and down short gauge pad 3 of interlaced arrangement along bit body, the length addition L1+L2 of upper and lower short gauge pad equals gauge pad length overall L, wherein desirable L1=L2=1/2L; Wear-resistingly insert 5 flat the studding with of short gauge pad, wear-resisting inserting made by hard alloy blocks, and its termination maintains an equal level with short gauge pad or be slightly high.
Second embodiment as shown in Figure 2, the length addition L1+L2 that the main difference part of it and a upper embodiment is upper and lower short gauge pad is greater than gauge pad length overall L, wherein the length of every short gauge piece is all greater than 1/2L.The upper the next two short gauge pads up and down maximum axial spacing of two ends are gauge pad length overall L.
The 3rd embodiment of the utility model is shown in Fig. 3,4, its feature is to install segmented path guarantor footpath in the circumferential interlaced arrangement of bit body to fill up 7, wherein the every little length of protecting the footpath pad of segmented is filled up length overall L for protecting the footpath, every segmented is little protects and has its radius on the pad of footpath and directly fill up segmentation less than the guarantor of 1/2 drill bit nominal diameter, and radius equals the length addition L3+L4=L that the footpath pad is protected in the remaining segmentation of 1/2 drill bit nominal diameter, and it is interlaced, be first path down, second path is upwards.Can put down all on the pad of whole guarantor footpath that edge is wear-resisting inserts 5, as shown in Figure 3, can directly fill up also that flat edge is wear-resisting inserts 5 the guarantor that radius equals 1/2 drill bit nominal diameter, on the pad of path guarantor footpath, install cutting teeth 8, pad flushes the tooth top of cutting teeth with protecting directly, all become the guarantor of band cutting teeth directly to fill up thus, as shown in Figure 4.
The 4th embodiment as shown in Figure 5, its main feature is to lay short gauge pad 3 and segmented path gauge pad 7 along the circumferential interlaced arrangement of bit body, namely a short gauge pad adjacent block is segmented path gauge pad, and short gauge pad is upper, the path of segmented path gauge pad up, and short gauge pad length L 1 equals path gauge pad length (L-L4).All can put down edge on the whole gauge pad and wear-resistingly insert 5.
The 5th embodiment as shown in Figure 6, its difference is that laying guarantor footpath piece 10 in the circumferential interlaced arrangement of bit body fills up 7 with segmented path guarantor footpath, protecting the footpath, to fill up length be L, wear-resistingly inserts 5 protecting on the pad of footpath flat studding with, and protects at the segmented path and can put down also on the pad of footpath that edge is wear-resisting inserts 5.
Claims (15)
1, a kind of lower resistance diamond bit that is used for strata drilling, include bit body (6) and hydraulic structure (4), the lower end of bit body is laid with cutting teeth (1) and gauge teeth (2), above gauge teeth, circumferentially be installed on the block footpath pad of protecting, it is characterized in that the described block footpath pad of protecting partly or entirely fills up the short footpath pad (3) of protecting of length overall for axial length less than protecting the footpath along bit body.
2, by the described lower resistance diamond bit of claim 1, it is characterized in that described whole gauge pad is short gauge pad (3), the length of every short gauge pad equals 1/2～2/3 gauge pad length overall, and each short gauge pad is along the up and down interlaced arrangement laying of bit body week.
3, by the described lower resistance diamond bit of claim 1, it is characterized in that described part gauge pad is short gauge pad, the gauge pad of remaining part is the gauge pad that axial length equals total gauge pad length, and short gauge pad and gauge pad are laid along the circumferential interlaced arrangement of bit body.
4, by claim 2 or 3 described lower resistance diamond bits, it is characterized in that the upper and lower short length addition L1+L2 that protects the footpath pad equals to protect the footpath and fills up length overall L, wherein get L1=L2=1/2L.
5,, it is characterized in that filling up flat wear-resisting the inserting (5) that stud with in the short footpath of protecting by the described lower resistance diamond bit of claim 2.
6, by the described lower resistance diamond bit of claim 2, it is characterized in that the length addition L1+L2 of upper and lower short gauge pad is greater than gauge pad length overall L.
7, a kind of lower resistance diamond bit that is used for strata drilling, include bit body (6) and hydraulic structure (4), the lower end of bit body is laid with cutting teeth (1) and gauge teeth (2), above gauge teeth, circumferentially be installed on the block footpath of protecting and fill up, it is characterized in that described block guarantor is provided with the path guarantor footpath pad of radius less than 1/2 drill bit nominal diameter in the pad of footpath along bit body.
8,, it is characterized in that radius that described path protects the footpath pad is 0.5～5 millimeter less than the amount of 1/2 drill bit nominal diameter by the described lower resistance diamond bit of claim 7.
9, by claim 7 or 8 described lower resistance diamond bits, it is characterized in that it is that the whole section radius of protecting the footpath pad is less than 1/2 drill bit nominal diameter that described path is protected the footpath pad, or be to protect the radius of directly 1/3～2/3 segmentation of pad less than 1/2 drill bit nominal diameter, remaining section radius equals the segmented path of 1/2 drill bit nominal diameter and protects directly pad (7).
10, by the described lower resistance diamond bit of claim 9, it is characterized in that being segmented path gauge pad (7) at the gauge pad that bit body is circumferentially laid, and segmented path gauge pad is laid along circumferential interlaced arrangement.
11, by claim 7 or 8 described lower resistance diamond bits, it is characterized in that a gauge pad part of circumferentially laying at bit body is path gauge pad, path gauge pad and gauge pad are laid along circumferential interlaced arrangement.
12, by the described lower resistance diamond bit of claim 10, it is characterized in that described gauge pad and/or path gauge pad be axial length less than the short gauge pad of total gauge pad length, described short gauge pad equals 1/2～2/3 gauge pad length overall.
13, by the described lower resistance diamond bit of claim 9, it is characterized in that the guarantor who equals 1/2 drill bit nominal diameter at radius directly fills up flat wear-resisting the inserting (5) of inlaying, to protect on the pad of footpath at path and install cutting teeth (8), pad flushes the tooth top of cutting teeth with protecting directly.
14, by the described lower resistance diamond bit of claim 9, it is characterized in that laying short gauge pad (3) and segmented path gauge pad (7) along the circumferential interlaced arrangement of bit body, namely a short gauge pad adjacent block is segmented path gauge pad, and short gauge pad is upper, the path of segmented path gauge pad up, and short gauge pad length L 1 equals path gauge pad length.
15, by claim 7 or 8 described lower resistance diamond bits, it is characterized in that laying gauge piece (10) and segmented path gauge pad (7) in the circumferential interlaced arrangement of bit body, gauge pad length is L, stud with wear-resisting inserting (5) in that the gauge pad is flat, also flat edge wear-resisting inserting (5) on segmented path gauge pad.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200420064863 CN2727379Y (en) | 2004-06-07 | 2004-06-07 | Low resistance diamond bit for stratigraphic drilling |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200420064863 CN2727379Y (en) | 2004-06-07 | 2004-06-07 | Low resistance diamond bit for stratigraphic drilling |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2727379Y true CN2727379Y (en) | 2005-09-21 |
Family
ID=35043396
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200420064863 Expired - Lifetime CN2727379Y (en) | 2004-06-07 | 2004-06-07 | Low resistance diamond bit for stratigraphic drilling |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2727379Y (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101688434B (en) * | 2007-05-30 | 2013-06-19 | 霍利贝顿能源服务公司 | Rotary drill bit with gage pads having improved steerability and reduced wear |
| CN104499947A (en) * | 2014-12-22 | 2015-04-08 | 泰州市宝锐石油设备制造有限公司 | Gravel-resistant drill |
-
2004
- 2004-06-07 CN CN 200420064863 patent/CN2727379Y/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101688434B (en) * | 2007-05-30 | 2013-06-19 | 霍利贝顿能源服务公司 | Rotary drill bit with gage pads having improved steerability and reduced wear |
| CN104499947A (en) * | 2014-12-22 | 2015-04-08 | 泰州市宝锐石油设备制造有限公司 | Gravel-resistant drill |
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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: 20140607 Granted publication date: 20050921 |