CN104763347A - Sweat cooling PDC drill bit - Google Patents
Sweat cooling PDC drill bit Download PDFInfo
- Publication number
- CN104763347A CN104763347A CN201510046506.0A CN201510046506A CN104763347A CN 104763347 A CN104763347 A CN 104763347A CN 201510046506 A CN201510046506 A CN 201510046506A CN 104763347 A CN104763347 A CN 104763347A
- Authority
- CN
- China
- Prior art keywords
- drill bit
- storage chamber
- cutting teeth
- pdc drill
- hole
- 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.)
- Granted
Links
- 210000004243 sweat Anatomy 0.000 title claims abstract description 30
- 238000001816 cooling Methods 0.000 title abstract description 13
- 230000036346 tooth eruption Effects 0.000 claims abstract description 43
- 239000002826 coolant Substances 0.000 claims abstract description 32
- 230000035900 sweating Effects 0.000 claims abstract description 23
- 239000011148 porous material Substances 0.000 claims description 7
- 239000000446 fuel Substances 0.000 claims description 6
- 229910003460 diamond Inorganic materials 0.000 claims description 5
- 239000010432 diamond Substances 0.000 claims description 5
- 238000007789 sealing Methods 0.000 claims description 5
- 238000005553 drilling Methods 0.000 abstract description 21
- 239000012530 fluid Substances 0.000 abstract description 6
- 239000010720 hydraulic oil Substances 0.000 description 7
- 238000005516 engineering process Methods 0.000 description 3
- 239000002828 fuel tank Substances 0.000 description 3
- 239000011435 rock Substances 0.000 description 3
- 239000007788 liquid Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000010412 perfusion Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B10/00—Drill bits
- E21B10/60—Drill bits characterised by conduits or nozzles for drilling fluids
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B10/00—Drill bits
- E21B10/42—Rotary drag type drill bits with teeth, blades or like cutting elements, e.g. fork-type bits, fish tail bits
- E21B10/43—Rotary drag type drill bits with teeth, blades or like cutting elements, e.g. fork-type bits, fish tail bits characterised by the arrangement of teeth or other cutting elements
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B10/00—Drill bits
- E21B10/46—Drill bits characterised by wear resisting parts, e.g. diamond inserts
Landscapes
- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Earth Drilling (AREA)
- Processing Of Stones Or Stones Resemblance Materials (AREA)
Abstract
The invention provides a sweat cooling PDC drill bit comprising a drill bit body. A through hole that is axially running through the drill bit body is arranged inside the drill bit body; the drill bit body is provided with an annular storage chamber; a piston is installed inside the storage chamber. The sweat cooling PDC drill bit further comprises a plurality of cutter wings that is equidistantly connected on an end of the drill bit body along the circumferential direction thereof. Cooling medium flow channels are arranged inside the cutter wings; and the cooling medium flow channels are communicated with the storage chamber. One side of each of the cutter wings is provided with a plurality of cutting teeth in parallel; the cutting teeth are provided with a plurality of sweating through holes which are communicated with the cooling medium flow channels. The provided sweat cooling PDC drill bit can be applied to the self-burying well drilling without a drilling fluid, the heat can be effectively dissipated by the cutting teeth thereof, accordingly reducing the temperature of the cutting teeth and extending the service life of the PDC drill bit.
Description
Technical field
The present invention has about a kind of PDC drill bit, especially has about a kind of from burying the Sweat coolling PDC drill bit applied in drilling field.
Background technology
Be first by drill bit fractured rock from burying drilling well, then take landwaste to upper wellbore compacting through mechanical device, realize the drilling well new technology that drilling well limit, limit is buried.Relative to existing drilling technology, certainly bury drilling well and have without rig, without drilling fluid, pollution-free, the feature of automatically burying.Drill bit is as the rock crushing tool of certainly burying drilling well, and the cooling of cutting teeth gives prominence to very much and urgent need to solve the problem.Certainly burying Cutter drilled dry bottom rock in drilling process, the temperature of cutting teeth can sharply raise rapidly, and owing to not having drilling fluid to cool, when temperature reaches certain high temperature, cutter-wear rate is accelerated greatly, even loses efficacy, and bit life then reduces greatly.In conventional drilling, Cutter realizes cooling by the drilling fluid circulated, and by the quick flowing of drilling fluid, takes away the heat of cutting teeth, reduce cutting teeth temperature, improve bit life.Therefore, the drill bit of conventional drilling is not suitable for from burying drilling well.
Therefore, be necessary to provide a kind of new PDC drill bit, overcome the problems referred to above.
Summary of the invention
The object of this invention is to provide a kind of Sweat coolling PDC drill bit, can be applicable to and certainly bury in drilling well without drilling fluid, its cutting teeth can effective dissipate heat, reduces cutting teeth temperature, improves the application life of PDC drill bit.
Above-mentioned purpose of the present invention can adopt following technical proposal to realize:
The invention provides a kind of Sweat coolling PDC drill bit, it comprises:
Drill body, is provided with through hole through vertically in it, described drill body offers the storage chamber of annular, be provided with piston in described storage chamber;
Multiple wing, it is along the circumferential direction connected to the end of described drill body at equal intervals, cooling medium runner is provided with in described wing, described cooling medium runner is connected with described storage chamber, the side of described wing is provided with multiple cutting teeth side by side, described cutting teeth is provided with multiple sweating through hole, and described sweating through hole is connected with described cooling medium runner.
In a preferred embodiment, the diameter of described sweating through hole is 200 μm ~ 400 μm.
In a preferred embodiment, the angle between described sweating through hole and the axis of described cutting teeth is 25 ° ~ 50 °.
In a preferred embodiment, described cutting teeth is cylindrical, and its external surface has been sticked polycrystalline diamond layer.
In a preferred embodiment, fairlead is provided with between the inwall of described piston and described storage chamber.
In a preferred embodiment, back-up ring and sealing ring is provided with between the inwall of described piston and described storage chamber.
In a preferred embodiment, described drill body is formed with connector away from one end of described wing, and described connector offers axial fuel feed hole, and described fuel feed hole is connected with described storage chamber.
In a preferred embodiment, be provided with intercommunicating pore in described drill body, described storage chamber is connected with described cooling medium runner by described intercommunicating pore.
Feature and the advantage of Sweat coolling PDC drill bit of the present invention are: this Sweat coolling PDC drill bit, when cutting teeth temperature is very high need cooling time, hydraulic oil is filled with by the oiling chamber to storage chamber, oiling cavity pressure is increased, piston moves, cooling medium in the cooling medium storage chamber of storage chamber is flowed out by sweating through hole, realizes the Sweat coolling to cutting teeth; When cutting teeth temperature drop to uniform temperature do not need cooling time, stop being filled with hydraulic oil in oiling chamber, oiling cavity pressure reduces and disappears, because sweating through-hole diameter is very little, cannot flow voluntarily in sweating through hole without cooling medium under ambient pressure, thus one, both the loss of cooling medium can have been greatly reduced, effectively can control again the temperature of cutting teeth, the application life of PDC drill bit can also be improved, this Sweat coolling PDC drill bit can overcome the shortcoming that existing drill bit exists, and meets from burying the cooling requirement of drilling well to Cutter.
Accompanying drawing explanation
In order to be illustrated more clearly in the technical scheme in the embodiment of the present invention, below the accompanying drawing used required in describing embodiment is briefly described, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
Fig. 1 is the stereogram of Sweat coolling PDC drill bit of the present invention.
Fig. 2 is the half sectional view of Sweat coolling PDC drill bit of the present invention.
Fig. 3 is the stereogram of the cutting teeth of Sweat coolling PDC drill bit of the present invention.
Fig. 4 is the sectional drawing of the cutting teeth of Sweat coolling PDC drill bit of the present invention.
Fig. 5 is the schematic diagram of the hydraulic system that Sweat coolling PDC drill bit of the present invention connects.
Detailed description of the invention
Below in conjunction with the accompanying drawing in the embodiment of the present invention, be clearly and completely described the technical scheme in the embodiment of the present invention, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.
As shown in Figures 1 and 2, the invention provides a kind of Sweat coolling PDC drill bit (Polycrystalline DiamondCompact bit, polycrystalline diamond compact bit), it comprises drill body 1 and multiple wing 2, wherein: in drill body 1, be provided with through hole 11 through vertically, described drill body 1 offers the storage chamber 12 of annular, in described storage chamber 12, be provided with piston 121; Multiple wing 2 is along the circumferential direction connected to the end of described drill body 1 at equal intervals, cooling medium runner 21 is provided with in described wing 2, described cooling medium runner 21 is connected with described storage chamber 12, the side of described wing 2 is provided with multiple cutting teeth 22 side by side, described cutting teeth 22 is provided with multiple sweating through hole 221, and described sweating through hole 221 is connected with described cooling medium runner 21.
Specifically, drill body 1 is substantially in cylindrical, through hole 11 through is vertically provided with in it, the storage chamber 12 of annular is provided with in drill body 1, the piston 121 of annular is provided with in this storage chamber 12, this storage chamber 12 is divided into oiling chamber 12a and cooling medium storage chamber 12b by piston 121, in the present embodiment, fairlead 122 is provided with between the inwall of piston 121 and storage chamber 12, and further, back-up ring 123 and sealing ring 124 is also provided with between the inwall of piston 121 and storage chamber 12, fairlead 122, the setting of back-up ring 123 and sealing ring 124 can improve the sealing performance between the inwall of piston 121 and storage chamber 12.One end of drill body 1 is formed with connector 13, connector 13 offers axial fuel feed hole 131, and this fuel feed hole 131 is connected with oiling chamber 12a.
Multiple wing 2 is along the circumferential direction equally spaced connected to drill body 1 one end away from its connector 13, in the present invention, four wings 2 are connected with in the end of drill body 1, four wings 2 are arranged on the end of drill body 1 along the radial direction of drill body 1, the cross section of wing 2 shrinks to small end along drill bit radial direction gradually by holding greatly, and the small end of four wings 2 converges at through hole 11 place of drill body 1.Shown in Fig. 3 and Fig. 4, the side outer rim of wing 2 is welded with multiple cutting teeth 22, this cutting teeth 22 is provided with multiple sweating through hole 221, in the present invention, the diameter of sweating through hole 221 is 200 μm ~ 400 μm, and the angle theta between this sweating through hole 221 and axis 222 of cutting teeth 22 is 25 ° ~ 50 °; Cutting teeth 22 is cylindrical, and its external surface has been sticked polycrystalline diamond layer 223, and those sweating through holes 221 run through this polycrystalline diamond layer 223.
Further, the inside, side away from its cutting teeth 22 on wing 2 is provided with cooling medium runner 21, has certain distance between this cooling medium runner 21 and cutting teeth 22, and the multiple sweating through hole 221 on cutting teeth 22 is connected with this cooling medium runner 21; Be provided with intercommunicating pore 14 in drill body 1, the cooling medium storage chamber 12b in drill body 1 is connected with the cooling medium runner 21 in wing 2 by this intercommunicating pore 14.
In the process that this Sweat coolling PDC drill bit creeps into, shown in Fig. 5, when the rising of cutting teeth 22 temperature needs cooling, by on drill body 1 connect hydraulic system 3 to perfusion liquid force feed in the oiling chamber 12a of drill body 1, particular by the through hole 131 on drill body 1, hydraulic oil is filled in the 12a of oiling chamber, hydraulic system 3 has reversal valve 31, this reversal valve 31 is connected with hydraulic pump 32 by choke valve 34, before perfusion, reversal valve 31 is positioned at left position, hydraulic pump 32 rotates and from fuel tank 33 inhalant liquid force feed, hydraulic oil arrives in the 12a of oiling chamber through choke valve 34 and reversal valve 31, now promote piston 121 to move, be contained in cooling medium in cooling medium storage chamber 12b in advance under the promotion of piston 121 by intercommunicating pore 14, cooling medium runner 21 and sweating through hole 221 arrive in cutting teeth 22, take away the heat gathered in cutting teeth 22, reduce cutting teeth 22 temperature.After cutting teeth 22 temperature declines, hydraulic pump 32 is closed down, right position changed to by reversal valve 31, hydraulic oil in the 12a of oiling chamber is back to fuel tank 33, oiling chamber 12a pressure reduces thereupon and disappears, cooling medium no longer flows, thus can greatly reduce the loss of cooling medium, effectively can control again the temperature of cutting teeth 22.
Sweat coolling PDC drill bit of the present invention, when cutting teeth 22 temperature is very high need cooling time, hydraulic oil is filled with to oiling chamber 12a by hydraulic system 3, make oiling chamber 12a pressure increase, piston 121 moves, cooling medium is flowed out by sweating through hole 221 under the effect of piston 121 pressure, realizes the Sweat coolling to cutting teeth 22, when cutting teeth 22 temperature drop to uniform temperature do not need cooling time, right position changed to by the reversal valve 31 of the hydraulic system 3 that drill body 1 top connects, in the 12a of oiling chamber, hydraulic oil is back to fuel tank 33, oiling chamber 12a pressure reduces and disappears, because sweating through hole 221 diameter is very little, cannot flow voluntarily in sweating through hole 221 without cooling medium under ambient pressure, thus one, both the loss of cooling medium can have been greatly reduced, effectively can control again the temperature of cutting teeth 22, the application life of PDC drill bit can also be improved, this Sweat coolling PDC drill bit can overcome the shortcoming that existing drill bit exists, meet from burying the cooling requirement of drilling well to Cutter.
The foregoing is only several embodiments of the present invention, those skilled in the art can carry out various change or modification to the embodiment of the present invention according to content disclosed in application documents and not depart from the spirit and scope of the present invention.
Claims (8)
1. a Sweat coolling PDC drill bit, is characterized in that, it comprises:
Drill body, is provided with through hole through vertically in it, described drill body offers the storage chamber of annular, be provided with piston in described storage chamber;
Multiple wing, it is along the circumferential direction connected to the end of described drill body at equal intervals, cooling medium runner is provided with in described wing, described cooling medium runner is connected with described storage chamber, the side of described wing is provided with multiple cutting teeth side by side, described cutting teeth is provided with multiple sweating through hole, and described sweating through hole is connected with described cooling medium runner.
2. Sweat coolling PDC drill bit as claimed in claim 1, it is characterized in that, the diameter of described sweating through hole is 200 μm ~ 400 μm.
3. Sweat coolling PDC drill bit as claimed in claim 1, it is characterized in that, the angle between described sweating through hole and the axis of described cutting teeth is 25 ° ~ 50 °.
4. Sweat coolling PDC drill bit as claimed in claim 1, it is characterized in that, described cutting teeth is cylindrical, and its external surface has been sticked polycrystalline diamond layer.
5. Sweat coolling PDC drill bit as claimed in claim 1, is characterized in that, be provided with fairlead between the inwall of described piston and described storage chamber.
6. Sweat coolling PDC drill bit as claimed in claim 1, is characterized in that, be provided with back-up ring and sealing ring between the inwall of described piston and described storage chamber.
7. Sweat coolling PDC drill bit as claimed in claim 1, it is characterized in that, described drill body is formed with connector away from one end of described wing, and described connector offers axial fuel feed hole, and described fuel feed hole is connected with described storage chamber.
8. Sweat coolling PDC drill bit as claimed in claim 1, it is characterized in that, be provided with intercommunicating pore in described drill body, described storage chamber is connected with described cooling medium runner by described intercommunicating pore.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510046506.0A CN104763347B (en) | 2015-01-23 | 2015-01-23 | Sweat coolling PDC drill bit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510046506.0A CN104763347B (en) | 2015-01-23 | 2015-01-23 | Sweat coolling PDC drill bit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104763347A true CN104763347A (en) | 2015-07-08 |
| CN104763347B CN104763347B (en) | 2017-01-04 |
Family
ID=53645404
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510046506.0A Active CN104763347B (en) | 2015-01-23 | 2015-01-23 | Sweat coolling PDC drill bit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104763347B (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108533183A (en) * | 2018-06-22 | 2018-09-14 | 西南石油大学 | The PDC drill bit of passive swivel nozzle is provided on a kind of wing |
| CN108661563A (en) * | 2018-05-16 | 2018-10-16 | 中国石油天然气集团有限公司 | Cutting tooth contains the PDC drill bit of fluid channel |
| CN109138829A (en) * | 2017-06-28 | 2019-01-04 | 盐城市新永佳石油机械制造有限公司 | A kind of helicoid hydraulic motor that can cool down automatically |
| US10577869B2 (en) | 2017-05-17 | 2020-03-03 | Baker Hughes, A Ge Company, Llc | Cutting elements including internal fluid flow pathways, and related earth-boring tools |
| US10584540B2 (en) | 2017-05-01 | 2020-03-10 | Baker Hughes, A Ge Company, Llc | Cutting tables including fluid flow pathways, and related cutting elements, and earth-boring tools |
| CN113216861A (en) * | 2021-05-27 | 2021-08-06 | 河北锐石钻头制造有限公司 | PDC drill bit suitable for directional drilling |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2268527A (en) * | 1992-07-07 | 1994-01-12 | Baker Hughes Inc | Drill bit cutting element with cooling channels |
| CN1091066A (en) * | 1992-12-10 | 1994-08-24 | 桑德维克公司 | The method of the augers of carrying coolant passage and manufacturing drill bit |
| JP2007154526A (en) * | 2005-12-06 | 2007-06-21 | Giken Seisakusho Co Ltd | Excavation tip and excavation tool |
| WO2008055349A1 (en) * | 2006-11-08 | 2008-05-15 | Nd Downhole Technology Ltd. | Reverse nozzle drill bit |
| CN202689950U (en) * | 2012-07-26 | 2013-01-23 | 贾鑫玉 | PDC (Polycrystalline Diamond Compact) drill with cooling channel |
| CN203459723U (en) * | 2013-08-01 | 2014-03-05 | 江苏天工工具有限公司 | Drill bit with coolant channel |
| CN204024483U (en) * | 2014-09-04 | 2014-12-17 | 廊坊市鼎鑫联拓工贸有限公司 | A kind of PDC drill bit |
-
2015
- 2015-01-23 CN CN201510046506.0A patent/CN104763347B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2268527A (en) * | 1992-07-07 | 1994-01-12 | Baker Hughes Inc | Drill bit cutting element with cooling channels |
| CN1091066A (en) * | 1992-12-10 | 1994-08-24 | 桑德维克公司 | The method of the augers of carrying coolant passage and manufacturing drill bit |
| JP2007154526A (en) * | 2005-12-06 | 2007-06-21 | Giken Seisakusho Co Ltd | Excavation tip and excavation tool |
| WO2008055349A1 (en) * | 2006-11-08 | 2008-05-15 | Nd Downhole Technology Ltd. | Reverse nozzle drill bit |
| CN202689950U (en) * | 2012-07-26 | 2013-01-23 | 贾鑫玉 | PDC (Polycrystalline Diamond Compact) drill with cooling channel |
| CN203459723U (en) * | 2013-08-01 | 2014-03-05 | 江苏天工工具有限公司 | Drill bit with coolant channel |
| CN204024483U (en) * | 2014-09-04 | 2014-12-17 | 廊坊市鼎鑫联拓工贸有限公司 | A kind of PDC drill bit |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US10584540B2 (en) | 2017-05-01 | 2020-03-10 | Baker Hughes, A Ge Company, Llc | Cutting tables including fluid flow pathways, and related cutting elements, and earth-boring tools |
| US10577869B2 (en) | 2017-05-17 | 2020-03-03 | Baker Hughes, A Ge Company, Llc | Cutting elements including internal fluid flow pathways, and related earth-boring tools |
| US11732532B2 (en) | 2017-05-17 | 2023-08-22 | Baker Hughes Holdings Llc | Methods of forming cutting elements |
| CN109138829A (en) * | 2017-06-28 | 2019-01-04 | 盐城市新永佳石油机械制造有限公司 | A kind of helicoid hydraulic motor that can cool down automatically |
| CN108661563A (en) * | 2018-05-16 | 2018-10-16 | 中国石油天然气集团有限公司 | Cutting tooth contains the PDC drill bit of fluid channel |
| CN108533183A (en) * | 2018-06-22 | 2018-09-14 | 西南石油大学 | The PDC drill bit of passive swivel nozzle is provided on a kind of wing |
| CN108533183B (en) * | 2018-06-22 | 2023-08-15 | 西南石油大学 | PDC drill bit with passive rotary nozzle arranged on blade |
| CN113216861A (en) * | 2021-05-27 | 2021-08-06 | 河北锐石钻头制造有限公司 | PDC drill bit suitable for directional drilling |
Also Published As
| Publication number | Publication date |
|---|---|
| CN104763347B (en) | 2017-01-04 |
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