CN106917588B - Split type reverse jet polycrystalline diamond drill bit - Google Patents
Split type reverse jet polycrystalline diamond drill bit Download PDFInfo
- Publication number
- CN106917588B CN106917588B CN201510981508.9A CN201510981508A CN106917588B CN 106917588 B CN106917588 B CN 106917588B CN 201510981508 A CN201510981508 A CN 201510981508A CN 106917588 B CN106917588 B CN 106917588B
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- CN
- China
- Prior art keywords
- channel
- drill bit
- chip removal
- drilling
- nozzle
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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.)
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Classifications
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
- E21B17/02—Couplings; joints
- E21B17/04—Couplings; joints between rod or the like and bit or between rod and rod or the like
- E21B17/042—Threaded
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP 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
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP 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
- E21B10/602—Drill bits characterised by conduits or nozzles for drilling fluids the bit being a rotary drag type bit with blades
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP 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
- E21B10/61—Drill bits characterised by conduits or nozzles for drilling fluids characterised by the nozzle structure
Abstract
The invention belongs to the field of drilling equipment, and particularly relates to a split type reverse jet polycrystalline diamond drill bit which comprises a drill bit body, wherein the drill bit body comprises a joint part and a drilling part, the joint part and the drilling part are welded at an outer seam after being connected through threads, a liquid injection channel is arranged at the center of the joint part, an upper section of a chip removal channel is arranged around the liquid injection channel, a nozzle channel is arranged at the center of the drilling part, a detachable nozzle connected through threads is arranged at the tail end of the nozzle channel, a lower section of the chip removal channel is arranged around the nozzle channel, and an annular groove with a circular arc-shaped cross section is arranged on. The split type design is adopted, so that the use function of the drill bit is ensured, and the processing cost is effectively reduced; the invention reduces the load of the pump, improves the pump efficiency, reduces the bottom hole pressure difference, improves the chip removal effect and further improves the mechanical drilling speed.
Description
Technical Field
The invention belongs to the technical field of drilling equipment, and particularly relates to a split type reverse jet polycrystalline diamond drill bit.
Background
In the drilling operation, the rock carrying capacity is an important index for measuring the using effect of the drill bit, and if the rock debris carrying effect does not meet the requirement, various problems can be caused, such as high friction and high torque, sand setting and drilling blockage, difficulty in casing and well cementation, serious abrasion of a drilling tool, difficulty in running a logging instrument, and the like, and even the drilling operation can be forced to be stopped. In recent years, some drill bits with reverse jet flow suction function are provided, part of drilling fluid is directly led to the upper section of a chip removal channel in the drill bit, chip removal is promoted through suction generated by the part of drilling fluid in an upward direction, and the structure not only can reduce the pressure difference at the bottom of a well and improve the mechanical drilling speed, but also can fundamentally eliminate a detritus bed in a horizontal well. However, due to the adoption of the integrated structure, the drill bit is difficult to manufacture and high in manufacturing cost. In addition, in the process that the drilling fluid turns to the upper section of the chip removal channel, the kinetic energy loss of the drilling fluid is large, the load of a pump is invisibly increased, and the pump efficiency is reduced.
Disclosure of Invention
The invention provides a split type reverse jet polycrystalline diamond drill bit, which aims to solve the problems of high manufacturing cost and reduced pump efficiency of the conventional drill bit in the background technology.
The technical problem solved by the invention is realized by adopting the following technical scheme: the invention provides a split type reverse jet polycrystalline diamond drill bit which comprises a drill bit body, wherein the drill bit body comprises a joint part and a drilling part, the joint part and the drilling part are welded at an outer seam after being connected through threads, threads for connecting a drill rod are arranged at one end, far away from the drilling part, of the joint part, a liquid injection channel is arranged at the center of the joint part, an upper section of a chip removal channel is arranged around the liquid injection channel, a horn mouth is arranged at one end, close to the drilling part, of the upper section of the chip removal channel, the outer side of the drilling part is diameter-preserving, a cutter blade is arranged on the end face of the outer side of the drilling part, a nozzle channel is arranged at the center of the drilling part, a detachable nozzle connected through threads is arranged at the tail end of the nozzle channel, a lower section of the chip removal channel is arranged around the nozzle channel, an annular groove with a circular arc-shaped cross section And the diameter of the edge with smaller size on the groove is smaller than that of the liquid injection channel.
The upper section of the chip removal channel and the lower section of the chip removal channel are at least three.
The nozzle channels are at least three groups, and the liquid inlet ends of all the nozzle channels are converged at one position.
The distance between the point on the groove closest to the joint part and the joint part is 5mm to 10 mm.
Compared with the prior art, the invention has the following good effects:
1. the split type design is adopted, so that the use function of the drill bit is ensured, and the processing cost is effectively reduced;
2. due to the adoption of the split design, the annular groove with the arc-shaped cross section and the flow guiding function is processed, so that the kinetic energy loss of the drilling fluid is greatly reduced in the process that the drilling fluid turns to the upper section of the chip removal channel, the load of the pump is reduced under the same working condition, the pump efficiency is improved, the bottom hole pressure difference is reduced, the chip removal effect is improved, and the mechanical drilling speed is further improved.
3. The setting of the detachable nozzle can facilitate the adjustment of the liquid injection amount during drilling.
Drawings
FIG. 1 is a schematic structural view of the present invention;
fig. 2 is a partial enlarged view at the detachable nozzle.
In the figure: 1-chip removal channel upper section, 2-joint part, 3-bell mouth, 4-groove, 5-chip removal channel lower section, 6-drilling part, 7-blade, 8-nozzle, 9-nozzle channel and 10-liquid injection channel.
Detailed Description
The invention is further described below with reference to the accompanying drawings:
the invention comprises a drill bit body, the drill bit body comprises a joint part 2 and a drilling part 6, the joint part 2 and the drilling part are welded at an outer seam after being connected through threads, one end of the joint part 2, which is far away from the drilling part 6, is provided with threads for connecting a drill rod, the center of the joint part 2 is provided with a liquid injection channel 10, a chip removal channel upper section 1 is arranged around the liquid injection channel 10, one end of the chip removal channel upper section 1, which is close to the drilling part 6, is provided with a bell mouth 3, the outer side of the drilling part 6 is diameter-protected, the outer end surface of the drilling part 6 is provided with a blade 7, the center of the drilling part 6 is provided with a nozzle channel 9, the tail end of the nozzle channel 9 is provided with a detachable nozzle 8 connected through threads, the chip removal channel lower section 5 is arranged around the nozzle channel, the diameter of the edge with larger size on the groove 4 is smaller than the maximum distance between the point on the edge of the bell mouth 3 and the axis of the drill bit, and the diameter of the edge with smaller size on the groove 4 is smaller than the diameter of the liquid injection channel 10. The number of the upper section 1 of the chip removal channel and the number of the lower section 5 of the chip removal channel are at least three. The nozzle channels 9 are at least three groups, and the liquid inlet ends of all the nozzle channels 9 are converged at one position. The distance between the point of the groove 4 nearest to the joint part 2 and the joint part 2 is 5mm to 10 mm.
The working process of the invention is as follows:
during drilling operation, drilling fluid is injected from the fluid injection channel 10, when the drilling fluid enters the drill bit, one part of drilling fluid is sprayed out from the nozzle 8 and then carries rock debris to flow back from the chip removal channel, and the other part of drilling fluid changes the flow direction under the guiding action of the groove 4 and is sprayed into the upper section 1 of the chip removal channel to play a role in pumping.
The technical advantages and effects of the present invention will now be explained from the specific features:
1. the manufacturing process comprises the following steps:
(1) if the drill bit is designed in an integrated manner, a plurality of complex internal structures cannot be realized by mechanical processing means, some structures cannot be realized by conventional mechanical processing means even if the structures can be processed, and only unconventional processing technologies such as lost foam casting, electrochemical processing and the like can be adopted, so that the processing difficulty is high, and the processing cost is high, therefore, the split type structure is adopted in the invention, the design not only enables the annular groove 4 with the arc-shaped cross section and having the flow guide function to be processed technically, but also enables the chip removal channel to be processed more easily, and the processing cost is lower;
(2) due to the split design, quality parameters such as surface roughness, flow linearity and the like of the groove 4 are easier to guarantee, so that the using effect is fully guaranteed;
(3) the joint part 2 and the drilling part 6 adopt a connection mode of welding after threaded connection, so that the connection coaxiality of the joint part and the drilling part is ensured, and the connection reliability is also ensured.
2. In terms of using effect:
(1) the groove 4 arranged in the invention can divide the drilling fluid flowing out of the fluid injection channel 10 into the upper section 1 of the chip removal channel, the drilling fluid is injected into the upper section 1 of the chip removal channel after changing the flow direction under the guiding action of the groove 4, and the drilling fluid entering the upper section 1 of the chip removal channel flows upwards under the pressure action to form a suction effect, so that the flow of rock debris flow is promoted, the bottom hole pressure difference is reduced, the chip removal efficiency is improved, and the mechanical drilling speed is further improved;
(2) the requirements for the liquid passing amount of the nozzle are different due to different actual production conditions such as stratum conditions, pump pressure and the like, and the arrangement of the nozzle 8 can be disassembled, so that an operator can replace the nozzle with different drift diameters, the liquid injection amount can be conveniently adjusted, and different working conditions can be adapted;
(3) at least three groups of chip removal channels and nozzle channels 9 can effectively ensure the liquid injection amount or the chip removal amount;
(4) the diameter of the edge with larger size on the groove 4 is smaller than the maximum distance between the point on the edge of the bell mouth 3 and the axis of the drill bit, and the diameter of the edge with smaller size on the groove 4 is smaller than the diameter of the liquid injection channel 10. The design requirement ensures that the groove 4 can smoothly split and the split part can be shot into the upper section 1 of the chip removal channel as accurately as possible;
(5) the distance between the point on the groove 4 closest to the joint part 2 and the joint part 2 is 5 mm-10 mm, so that the smooth flow of rock debris can be ensured, and the accurate flow direction of the drilling fluid after the drilling fluid is divided by the groove 4 can be ensured;
(6) the flare opening 3 further improves the smoothness of the rock debris flow.
Claims (1)
1. The utility model provides a split type reverse jet polycrystalline diamond drill bit, includes the drill bit body, its characterized in that: the drill bit body comprises a joint part (2) and a drilling part (6), the two are welded at an outer seam after being connected through threads, one end, far away from the drilling part (6), of the joint part (2) is provided with threads for connecting a drill rod, the center of the joint part (2) is provided with a liquid injection channel (10), a chip removal channel upper section (1) is arranged around the liquid injection channel (10), one end, close to the drilling part (6), of the chip removal channel upper section (1) is provided with a horn mouth (3), the outer side of the drilling part (6) is of a gauge, a cutter wing (7) is arranged on the outer end face of the drilling part (6), a nozzle channel (9) is arranged at the center of the drilling part (6), the tail end of the nozzle channel (9) is provided with a detachable nozzle (8) connected through threads, and a chip removal channel lower section (5) is, the length direction of the lower section (5) of the chip removal channel is consistent with the axial direction of the drill bit, an annular groove (4) with a circular arc-shaped cross section is arranged on the end surface of the inner side of the drilling part (6), the diameter of the edge with a larger size on the groove is smaller than the maximum distance between the point on the edge of the horn mouth (3) and the axial line of the drill bit, and the diameter of the edge with a smaller size on the groove (4) is smaller than the diameter of the liquid injection channel (10);
at least three chip removal channel upper sections (1) and chip removal channel lower sections (5) are provided;
the number of the nozzle channels (9) is at least three, and the liquid inlet ends of all the nozzle channels (9) are converged at one position;
the distance between the point on the groove (4) closest to the joint part (2) and the joint part (2) is 5mm to 10 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510981508.9A CN106917588B (en) | 2015-12-24 | 2015-12-24 | Split type reverse jet polycrystalline diamond drill bit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510981508.9A CN106917588B (en) | 2015-12-24 | 2015-12-24 | Split type reverse jet polycrystalline diamond drill bit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106917588A CN106917588A (en) | 2017-07-04 |
| CN106917588B true CN106917588B (en) | 2020-02-07 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510981508.9A Active CN106917588B (en) | 2015-12-24 | 2015-12-24 | Split type reverse jet polycrystalline diamond drill bit |
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| Country | Link |
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| CN (1) | CN106917588B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110303012A (en) * | 2019-07-29 | 2019-10-08 | 武汉特瑞升电子科技有限公司 | A kind of pipe dredging device |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102345445A (en) * | 2011-06-10 | 2012-02-08 | 中国石油大学(华东) | Drill bit for particle impact drilling technology |
| CN103835659B (en) * | 2014-03-18 | 2016-09-07 | 西南石油大学 | A kind of drill bit improving center chip removal efficiency |
| US11428050B2 (en) * | 2014-10-20 | 2022-08-30 | Baker Hughes Holdings Llc | Reverse circulation hybrid bit |
| CN104329028B (en) * | 2014-11-16 | 2016-08-24 | 吉林大学 | Split type interior injection reacting cycle rotary percussion drill bit |
| CN204663403U (en) * | 2015-05-11 | 2015-09-23 | 中国石油大学(北京) | Mixing jet mill drill bit after a kind of horizontal well oblique |
| CN104806173A (en) * | 2015-05-11 | 2015-07-29 | 中国石油大学(北京) | Oblique-crossing back mixing type jet mill drill bit of horizontal well |
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- 2015-12-24 CN CN201510981508.9A patent/CN106917588B/en active Active
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| Publication number | Publication date |
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| CN106917588A (en) | 2017-07-04 |
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