CN201865584U - Pressure-relief acceleration drill bit structure - Google Patents
Pressure-relief acceleration drill bit structure Download PDFInfo
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- CN201865584U CN201865584U CN 201020606378 CN201020606378U CN201865584U CN 201865584 U CN201865584 U CN 201865584U CN 201020606378 CN201020606378 CN 201020606378 CN 201020606378 U CN201020606378 U CN 201020606378U CN 201865584 U CN201865584 U CN 201865584U
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- drill bit
- water hole
- transition region
- runner transition
- speed
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Abstract
A pressure-relief acceleration drill bit structure comprises a drill bit body, a main passage, a passage transition area, a water pore, a clamp spring groove, a seal groove and an erosion resistant layer, wherein the main passage, the passage transition area and the water pore are positioned in the drill bit body, the main passage is communicated with the water pore through the passage transition area, axes of the passage transition area, the water pore and the main passage are positioned in a same plane, the clamp spring groove and the seal groove are positioned in the water pore, and the erosion resistant layer is positioned on the surface of the passage transition area. An included angle between an outlet direction of the drill bit water pore and an axis of the drill bit is adjusted from 0-60 degrees to 90-180 degrees, direct downward impact to hole bottom of mud is changed into slantingly upward impact opposite to the hole bottom, a low-pressure vortex area is formed at the hole bottom under rotation driving of the drill bit, and accordingly local pressure of an acting face of the drill bit is reduced, hold-down effect of mud column to stone chips is reduced, drilling speed is increased and drilling cost is reduced.
Description
Technical field
The utility model relates to oil and geological drilling engineering field, particularly a kind of drill bit structure of the speed-raising of reducing pressure.
Background technology
For the petroleum resources of recovery of subterranean, need utilize drilling tool to drill subsurface formations.These drilling tools from ground to underground derrick, rotating disk, kelly bar, drilling rod, drill collar and the drill bit of generally comprising successively.Wherein thereby drill bit cuts the stratum and creeps into well.Produce a large amount of landwaste in the time of the bit cutting stratum in the shaft bottom, for these landwaste are scavenged into ground, must be when creeping into by the inner mud that injects of drill string, these mud turn back to ground from the drill bit ejection and through the annular space between drill string and the stratum, thereby landwaste is carried to ground.Yet mud produces a very large fluid column press force to the shaft bottom, for example, for 3000 meters dark wells, uses density to be 1.1g/cm
3Mud drilling, such pressure will reach 33MPa.The water hole outlet of existing drill bit is directed downwards along well depth, and with the drill axis angle be 0 °～60 °, slurry flows is directly impacted the shaft bottom behind nozzle, under huge press force effect, the landwaste that bit cutting gets off by pressure holding in the shaft bottom, thereby be unfavorable for the removing of landwaste, greatly reduced the landwaste elimination efficiency.Particularly in the drilling process of deep-well and ultradeep well, huge mud fluid column press force will greatly influence the timely removing of landwaste, causes the repetition fragmentation of drill bit, reduces bit speed.
In order to address this problem, people are usually by raising slush pump discharge capacity, increase pump pressure, and the method that adopts various nozzles combinations and change nozzle arrangements, rely on the impact force of high-pressure water jet increase to the shaft bottom, the broken rock of realization water jet and mechanically combining.Yet this method has strengthened the press force of mud fluid column to the shaft bottom landwaste, and particularly in deep-well and ultradeep well drilling well, because huge mud fluid column pressure, simple dependence high-pressure spray means improve drilling speed effect and not obvious.Therefore press for a kind of drill bit that can reduce the shaft bottom local pressure,, improve rate of penetration greatly thereby be implemented under the prerequisite that keeps wellbore stability keeping reducing the mud column pressure of drill bit acting surface under the constant situation of whole well mud head of liquid.
Summary of the invention
The purpose of this utility model is to overcome deficiency of the prior art, thereby provides a kind of mud column press force that can reduce shaft bottom drill bit acting surface to improve the drill bit structure of drilling speed.
The utility model solves the problems of the technologies described above the technical scheme of being taked: a kind of drill bit structure that reduces pressure speed-raising is made up of bit body, sprue, runner transition region, water hole, jump ring groove, seal groove and erosion resistance layer, sprue, runner transition region and water hole are positioned at bit body, the runner transition region is communicated with sprue and water hole, the axis in runner transition region and water hole and the axis of sprue are in the same plane, jump ring groove and seal groove are positioned at the water hole, and the erosion resistance layer is positioned at runner transition region surface.
Sprue is cylindrical, the dead in line of its axis and bit body; The upper end of sprue links to each other with drilling fluid passage in the drill string, and its lower end links to each other with the runner transition region.
The runner transition region comprises the taper contraction section, turns to bending section and the diffuser that makes progress, and it is conical that the taper contraction section is, and turns to bending section to be convexly curved and upwarp, and upwards diffuser is cylindrical, link to each other with the water hole, and its center line and water hole central lines.
The water hole is cylindrical, and Way out is tilted to, and the axis angle α of its axis and drill bit is: 90 °＜α＜180 °.
The jump ring groove is positioned at the water hole inner upper end, is used to place jump ring, so that bit nozzle is fixed in the water hole.
Seal groove is positioned at the water hole bosom, is used to place sealing device, reveals from the gap between nozzle and the water hole to prevent mud; Sealing device adopts " O " RunddichtringO and Expansion sealing structure.
The erosion resistance layer is the method that adopts oxy-acetylene, laser melting coating or plasma arc welding (PAW), and anti-erosion material is applied the surface that is welded in the runner transition region, and applying weldering thickness is 0.2～2.0mm.
The utility model will have the water hole Way out of drill bit now, by with the drill axis angle be 0 °～60 °, be adjusted into the drill axis angle be 90 °～180 °.Slurry flows by original direct impact shaft bottom downwards, changes over and deviates from the shaft bottom direction and be tilted to the directive borehole wall behind nozzle.Under the drive of drill bit rotary speed, after mud penetrates from the water hole, move in a circle with drill bit, near drill bit, form whirlpool, produce a low-pressure area in whirlpool bottom, thereby the mud fluid column press force in shaft bottom is reduced, the shaft bottom landwaste is under action of pressure up and down, left the shaft bottom by pumping, return ground with drilling fluid.On the one hand, drill bit structure of the present utility model produces a local depression whirlpool district in the shaft bottom, reduces the chip hold down of shaft bottom landwaste, realizes the pumping to the shaft bottom landwaste, quickens the removing of landwaste, reduces the repetition fragmentation of landwaste, improves drilling speed; On the other hand owing to do not need powerful slush pump and diesel engine, thereby reduce drilling cost, saved the energy.
Description of drawings
Fig. 1 is a vertical profile TV structure schematic diagram of the present utility model;
Fig. 2 is an embodiment tricone bit of a utility model bit leg sectional structure schematic diagram;
Fig. 3 is an embodiment PDC of a utility model drill bit sectional structure schematic diagram.
The specific embodiment
As shown in Figure 2, a kind of tricone bit that reduces pressure speed-raising is made up of bit leg 11, gear wheel 12, sprue 1, runner transition region 3, water hole 4, jump ring groove 5, seal groove 6 and erosion resistance layer 7.Runner transition region 3 by taper contraction section 8, turn to bending section 9 and upwards diffuser 10 form.Three identical runner transition regions 3 and water hole 4 are 120 ° and are symmetrically distributed in the bit body 2, and every group of runner transition region 3 is all identical or all inequality from the distance of shaft bottom horizontal plane with water hole 4, when all inequality, every group of adjacent described runner transition region 3 is identical from the spacing of the distance of shaft bottom horizontal plane with described water hole 4.In the accompanying drawings, the represented direction of solid arrow is the flow direction of mud in the drill bit.Drill string drives the tricone bit rotation, and gear wheel 12 rotates broken bottom rock.Mud enters in the sprue 1 of bit leg 11 inside in drill string, taper contraction section 8 speed through runner transition region 3 increase, pressure reduces, flow through turning to bending section 9 to become gradually to be tilted to by flowing straight down, again through upwards diffuser 10 diffusions, fluid pressure increases, the nozzle inclination directive borehole wall from water hole 4.Under the drive of drill bit rotary speed, after mud penetrates from water hole 4, move in a circle with drill bit, near drill bit, form whirlpool, produce a low-pressure area in whirlpool bottom, thereby the mud fluid column press force in shaft bottom is reduced, the shaft bottom landwaste is under action of pressure up and down, left the shaft bottom by pumping, return ground with drilling fluid.Erosion resistance layer 7 is to adopt anti-erosion material to apply the surface that is welded in runner transition region 3, to improve the anti-erosion property of runner transition region 3 under high speed mud washes away, improves drilling life of bit.
Shown in Figure 3, a kind of decompression speed-raising PDC drill bit is made up of bit body 2, runner 1, runner transition region 3, water hole 4, jump ring groove 5, seal groove 6, erosion resistance layer 7, wing 13 and diamond composite sheet-PDC14.Runner transition region 3 by taper contraction section 8, turn to bending section 9 and upwards diffuser 10 form.In the bit body 2 1～10 group of identical runner transition region 3 and water hole 4 can be set simultaneously, each organizes described runner transition region 3 and described water hole 4 is symmetrically distributed in the bit body 2 along circumference; Every group of described runner transition region 3 is all identical or inequality from the distance of shaft bottom horizontal plane with described water hole 4, and when inequality, adjacent every group or per two groups, per three groups of runner transition regions 3 are identical from the spacing of the distance of shaft bottom horizontal plane with water hole 4.Drill string drives the rotation of PDC drill bit, and the diamond composite sheet on the wing 13-PDC14 rotates the scraping bottom rock.Mud enters in the sprue 1 of bit body 2 inside in drill string, taper contraction section 8 speed through runner transition region 3 increase, pressure reduces, flow through turning to bending section 9 to become gradually to be tilted to by flowing straight down, again through upwards diffuser 10 diffusions, fluid pressure increases, the nozzle inclination directive borehole wall from water hole 4.Under the drive of drill bit rotary speed, after mud penetrates from water hole 4, move in a circle with drill bit, near drill bit, form whirlpool, produce a low-pressure area in whirlpool bottom, thereby the mud fluid column press force in shaft bottom is reduced, the shaft bottom landwaste is under action of pressure up and down, left the shaft bottom by pumping, return ground with drilling fluid.Erosion resistance layer 7 is to adopt anti-erosion material to apply the surface that is welded in runner transition region 3, to improve the anti-erosion property of runner transition region 3 under high speed mud washes away, improves drilling life of bit.
Claims (10)
- One kind reduce pressure the speed-raising drill bit structure, form by bit body, sprue, runner transition region, water hole, jump ring groove, seal groove and erosion resistance layer, it is characterized in that: sprue (1), runner transition region (3) and water hole (4) are positioned at bit body (2), runner transition region (3) is communicated with sprue (1) and water hole (4), the axis of the axis of runner transition region (3) and water hole (4) and sprue (1) is in the same plane, jump ring groove (5) is positioned at water hole (4) with seal groove (6), and erosion resistance layer (7) is positioned at runner transition region (3) surface; Sprue (1) is cylindrical, the dead in line of its axis and bit body (2); The upper end of sprue (1) links to each other with drilling fluid passage in the drill string, and its lower end links to each other with runner transition region (3); Runner transition region (3) comprises taper contraction section (8), turns to bending section (9) and the diffuser (10) that makes progress, it is conical that taper contraction section (8) is, turning to bending section (9) to be convexly curved upwarps, upwards diffuser (10) is cylindrical, link to each other with water hole (4), and its center line and water hole (4) central lines; Water hole (4) is cylindrical, and Way out is tilted to, and the axis angle α of its axis and drill bit is: 90 °＜α＜180 °.
- 2. the drill bit structure of a kind of speed-raising of reducing pressure according to claim 1, it is characterized in that: jump ring groove (5) is positioned at water hole (4) inner upper end, is used to place jump ring, bit nozzle is fixed in the water hole (4).
- 3. the drill bit structure of a kind of speed-raising of reducing pressure according to claim 1, it is characterized in that: seal groove (6) is positioned at water hole (4) bosom, is used to place sealing device, and sealing device adopts " O " RunddichtringO and Expansion sealing structure.
- 4. the drill bit structure of a kind of speed-raising of reducing pressure according to claim 1, it is characterized in that: erosion resistance layer (7) is the method that adopts oxy-acetylene, laser melting coating or plasma arc welding (PAW), anti-erosion material is applied the surface that is welded in runner transition region (3), and applying weldering thickness is 0.2～2mm.
- 5. the drill bit structure of a kind of speed-raising of reducing pressure according to claim 1, drill bit is a tricone bit, the bit leg (11) and the gear wheel (12) of three fractured rocks are arranged on the bit body (2), it is characterized in that: three groups of identical runner transition regions (3) and water hole (4) are 120 ° and are symmetrically distributed in the bit body (2).
- 6. the drill bit structure of a kind of speed-raising of reducing pressure according to claim 5, it is characterized in that: every group of runner transition region (3) is all identical from the distance of shaft bottom horizontal plane with water hole (4).
- 7. the drill bit structure of a kind of speed-raising of reducing pressure according to claim 5, it is characterized in that: every group of runner transition region (3) and water hole (4) are all inequality from the distance of shaft bottom horizontal plane, and adjacent every group of runner transition region (3) is identical from the spacing of the distance of shaft bottom horizontal plane with water hole (4).
- 8. the drill bit structure of a kind of speed-raising of reducing pressure according to claim 1, drill bit is the PDC drill bit, diamond composite sheet-PDC (14) that fractured rock is arranged on the bit body (2), it is characterized in that: in the bit body (2) 1～10 group of identical runner transition region (3) and water hole (4) can be set simultaneously, each organizes runner transition region (3) and water hole (4) are symmetrically distributed in the bit body (2) along circumference.
- 9. the drill bit structure of a kind of speed-raising of reducing pressure according to claim 8, it is characterized in that: every group of runner transition region (3) is all identical from the distance of shaft bottom horizontal plane with water hole (4).
- 10. the drill bit structure of a kind of speed-raising of reducing pressure according to claim 8, it is characterized in that: every group of runner transition region (3) and water hole (4) are all inequality from the distance of shaft bottom horizontal plane, and adjacent every group or per two groups, per three groups of runner transition regions (3) are identical from the spacing of the distance of shaft bottom horizontal plane with water hole (4).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201020606378 CN201865584U (en) | 2010-11-04 | 2010-11-04 | Pressure-relief acceleration drill bit structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201020606378 CN201865584U (en) | 2010-11-04 | 2010-11-04 | Pressure-relief acceleration drill bit structure |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201865584U true CN201865584U (en) | 2011-06-15 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201020606378 Expired - Fee Related CN201865584U (en) | 2010-11-04 | 2010-11-04 | Pressure-relief acceleration drill bit structure |
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| Country | Link |
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| CN (1) | CN201865584U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102220845A (en) * | 2010-11-04 | 2011-10-19 | 中国海洋石油总公司 | Pressure reducing and speed raising drill structure |
| CN103776712A (en) * | 2012-10-20 | 2014-05-07 | 中国石油化工股份有限公司 | Simulation bit for determining drilling characteristic of PDC |
-
2010
- 2010-11-04 CN CN 201020606378 patent/CN201865584U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102220845A (en) * | 2010-11-04 | 2011-10-19 | 中国海洋石油总公司 | Pressure reducing and speed raising drill structure |
| CN103776712A (en) * | 2012-10-20 | 2014-05-07 | 中国石油化工股份有限公司 | Simulation bit for determining drilling characteristic of PDC |
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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: 20110615 Termination date: 20151104 |
|
| EXPY | Termination of patent right or utility model |