CN204040915U - horizontal well safe and efficient gas drilling jet mill drill bit - Google Patents
horizontal well safe and efficient gas drilling jet mill drill bit Download PDFInfo
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- CN204040915U CN204040915U CN201320799366.0U CN201320799366U CN204040915U CN 204040915 U CN204040915 U CN 204040915U CN 201320799366 U CN201320799366 U CN 201320799366U CN 204040915 U CN204040915 U CN 204040915U
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- China
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- landwaste
- drill bit
- jet mill
- horizontal well
- shaft bottom
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Abstract
The utility model discloses a kind of for horizontal well safe and efficient gas drilling jet mill drill bit, it is characterized in that having installed jet mill device additional on existing drill bit and high concentration turbulent flow takes out sand device, jet mill drill bit comprises: jet mill portion, and high concentration turbulent flow takes out sand portion; Described jet mill portion it is characterized in that having reverse high-speed jet nozzle, mixing chamber, trunnion, landwaste dissociate accelerating tube, pulverize target body, crushing bin, bypass; High concentration turbulent flow takes out sand portion, and it is characterized in that has shaft bottom landwaste to stir and cleaning runner, landwaste suction pipe.Landwaste suction pipe, shaft bottom landwaste stir and aspirate high concentration turbulent flow landwaste with cleaning runner based on the principle of sand pump, reduce bottom hole pressure difference further, improve drilling speed; Shaft bottom landwaste is discharged from the suction of landwaste suction pipe, avoids nearly drill bit place borehole wall erosion in gas drilling and collapses; Shaft bottom landwaste stirs and avoids drill bit ice bag in gas drilling with the particular design of cleaning runner.Based on jet mill principle, landwaste is pulverized further through high velocity air superfine technique, reaches the standard of gas-solid suspension flowing, eliminates the cutting bed in gas horizontal well drilling.
Description
Technical field
The invention belongs to oil/gas drilling field, be specifically related to a kind of for horizontal well safe and efficient gas drilling jet mill drill bit.
Background technology
As everyone knows, take the important problem that rock is gas horizontal well drilling, landwaste, once produce, departs from shaft bottom, is then all difficult to return shaft bottom whether great or small and is repeated fragmentation.Granule can be carried by air-flow, enter people's vertical section, then takes well head out of, and bulky grain is just detained the lower borehole wall, is piled into bed.The accumulation of cutting bed, hinders from geometry further and hydrodynamics two aspects affect the pit shaft at its rear normally takes rock, and hole cleaning is worsened further.If landwaste carries effect and do not reach requirement, can cause the generation of various problem, as high moment of torsion and high-drag, sand setting bit freezing, setting of casing and well cementation difficulty, drill tool wear is large, and it is difficult etc. that logger is gone into the well, and so drilling well may be forced to stop.On-the-spot in order to control cutting bed, often carry out very short distance and put on the ground and put drilling tool, return shaft bottom after making drill bit lift-off shaft bottom, bulky grain landwaste near drill bit is pushed back shaft bottom and repeat broken; Restriction drilling speed, low the pressure of the drill, high rotating speed, make the landwaste of drill bit first time broken generation be unlikely excessive, but this all greatly reduces rate of penetration.Add atm number and have certain help for the large rock-carrying ability improving eccentric annulus lower flow passage, but the non-constant of effect, and nearly drill bit place high velocity air is washed away seriously the borehole wall, causes hole collapse.Moreover, the high velocity air at bit nozzle place is easy to produce sonic flow, temperature of diamond bit is declined, drill bit ice bag, high velocity air erosion shaft bottom, makes drilling trace off-design track.
Summary of the invention
The first object of the present invention is to pulverize landwaste, and what solve gas horizontal well drilling takes a rock difficult problem, eliminates cutting bed.
The second object of the present invention is to solve in gas drilling, because the high velocity air of bit nozzle ejection makes the problems such as the borehole wall erosion at nearly drill bit place is collapsed, well off-design track, drill bit ice bag.
The third object of the present invention is to utilize backward jet to aspirate well fluids downhole and landwaste, reduces bottom hole pressure difference, eliminates chip hold down effect, improve rate of penetration further.
For realizing the first object, the jet mill of jet mill drill bit of the present invention comprises:
Reverse high-speed jet nozzle, for generation of high energy-gathering jetting; By appropriate design nozzle chamber shape, fluid is made to accelerate, for high energy-gathering jetting, fully to pulverize landwaste by nozzle.
Mixing chamber, is connected with high-speed jet nozzle, for landwaste is mixed into high-speed jet; High-pressure fluid sprays through nozzle at high speeds, pressure discharges rapidly, negative pressure is produced in mixing chamber, landwaste is sucked at a high speed, and is entrainmented by high-speed jet bundle and return stream, and the peripheral landwaste of jet beam is by the impact of mixing chamber end-contraction Dam Configuration Design, produce at contraction section and reflux and import high-speed jet main flow, form two-phase mixtures jet, at the landwaste of mixing jet space outerpace then under shear action, flow into accelerating tube at a high speed.
Landwaste dissociates accelerating tube, is connected with mixing chamber, for the landwaste of the band microcrack that dissociates, realizes dissociating fragmentation, and the surge that the collision between alternate and particle, attrition produce and shearing force cause the fragmentation of particle, and realize the acceleration to landwaste; In order to avoid attached jet and raising jet energy utilization rate, nozzle diameter and accelerating tube caliber are configured and is optimized.
Pulverize target body, be connected with the landwaste accelerating tube that dissociates, utilize instant impact, gas wedge pulverizing landwaste; Increase resistance to the adverse effect pulverized to reduce air cushion, target surface and accelerating tube axis designs are at an angle.
Crushing bin, is connected, for the pulverizing again to landwaste at an angle with pulverizing target surface.
Bypass, is connected at an angle with crushing bin and T-Ring is empty, for reducing the flow velocity of mixed flow, and the landwaste after pulverizing is entered annular space.
For realizing the second object, the sand pump of jet mill drill bit of the present invention comprises:
Shaft bottom landwaste stirs and cleaning runner, be communicated with shaft bottom, for stirring landwaste and cooling drill bit, shaft bottom landwaste is impacted into the turbulent flow of high concentration by the asymmetric high-velocity fluid of this runner injection, makes jet mill when need not realize high concentration and suck landwaste when fixture; The asymmetrical design of runner improves landwaste and stirs efficiency, and for increasing the impact area of fluid, runner does not fill nozzle, and is convergent divergent channel, in gas drilling, solves the problem of drill bit ice bag.
Landwaste suction pipe, at the bottom of connected well and mixing chamber, for siphoning away shaft bottom landwaste, allows shaft bottom landwaste and air-flow return from suction pipe.
Reverse high-speed jet nozzle, it is connected by mixing chamber with landwaste suction pipe, for generation of negative pressure.Contrainjector avoids gas drilling high speed air-flow and the borehole wall erosion at nearly drill bit place is collapsed, and air-flow erosion well makes its off-design track.
Bypass, is connected at an angle with crushing bin and T-Ring is empty, for reducing the flow velocity of mixed flow, reduces mixed flow to the erosion of the borehole wall, and the landwaste after pulverizing is entered annular space.
For realizing the 3rd object, jet mill drill bit of the present invention devise reverse high-speed jet nozzle:
Reverse high-speed jet nozzle, it makes use of the principle of jet pump, namely aspirates well fluids downhole and shaft bottom local pressure is reduced, reduce bottom hole pressure difference, thus impels landwaste to depart from shaft bottom and accelerate to return, and avoids repetition broken, realizes the raising of rate of penetration further.
In sum, compared with prior art, the present invention has following beneficial effect:
(1), described jet mill utilizes the superfine technique of high energy-gathering jetting can pulverize landwaste, greatly reduces the terminal velocity of landwaste in horizontal well, improves and takes rock efficiency, the cutting bed in elimination of level well.Compare and adopt low the pressure of the drill height rotating speed, short trip to control cutting bed, the present invention fundamentally solves cutting bed problem, and has liberated the pressure of the drill, improves drilling speed.
(2), in gas horizontal well drilling, usually gas injection rate is strengthened in order to control cutting bed, the high velocity air of bottom hole flow bean ejection, make that the borehole wall erosion at nearly drill bit place is collapsed, well off-design track, drill bit ice bag, jet mill bit hydraulic structure of the present invention solves the problems referred to above in the lump.
(3), reverse high-speed jet nozzle of the present invention utilizes the principle of jet pump, suction well fluids downhole makes shaft bottom local pressure reduce, and reduces bottom hole pressure difference, thus impels landwaste to depart from shaft bottom and accelerate to return, avoid repetition broken, improve rate of penetration.
Accompanying drawing explanation
Fig. 1 is a kind of schematic diagram for horizontal well safe and efficient gas drilling jet mill drill bit.
Fig. 2 is A-A generalized section in Fig. 1.
Fig. 3 is B-B generalized section in Fig. 1.
Fig. 4 is C-C generalized section in Fig. 1.
Fig. 5 is D-D generalized section in Fig. 1.
Fig. 6 is E-E generalized section in Fig. 1.
Fig. 7 is that a kind of hydrophthalmia for horizontal well safe and efficient gas drilling jet mill drill bit and chip-removal hole arrange schematic diagram;
Fig. 8 is a kind of high-speed jet nozzle schematic diagram for horizontal well safe and efficient gas drilling jet mill drill bit;
In figure: 1, bypass, 2, crushing bin, 3, trunnion, 4, oppositely high-speed jet nozzle, 5, PDC drill body, 6, drill bit wing, 7, pulverize target body, 8, dissociate accelerating tube, 9, mixing chamber, 10, landwaste suction pipe, 11, shaft bottom landwaste stirs and cleaning runner.
Detailed description of the invention
As shown in Figure 1, a kind of for horizontal well safe and efficient gas drilling jet mill drill bit, comprising: 1, bypass, 2, crushing bin, 3, trunnion, 4, oppositely high-speed jet nozzle, 5, PDC drill body, 6, drill bit wing, 7, target body is pulverized, 8, dissociate accelerating tube, 9, mixing chamber, 10, landwaste suction pipe, 11, shaft bottom landwaste stir with cleaning runner.Sum up and be mainly three major parts: the sand pump bottom drill bit, jet pump, jet mill.
In drilling process, high pressure draught is entered by sprue, part air-flow is sprayed by reverse high-speed jet nozzle 4, form high-speed jet, high-speed jet produces negative pressure at mixing chamber 9, and this negative pressure is aspirated by landwaste suction pipe 10 pairs of well fluids downhole and landwaste, thus reduction bottom hole pressure difference, reduce the chip hold down effect of landwaste, create the insufficient balance condition in shaft bottom, improve rate of penetration further.This part is jet pump.
High pressure draught is entered by sprue, part fluid is stirred by shaft bottom landwaste and sprays with cleaning runner 11, shaft bottom landwaste is impacted into the turbulent flow of high concentration by the asymmetric high-velocity fluid of described runner injection, make jet mill when need not realize high concentration and suck landwaste when fixture, the asymmetrical design of runner improves landwaste and stirs efficiency.Shaft bottom high concentration landwaste turbulent flow enters mixing chamber 9 through landwaste suction pipe 10 under the swabbing action of reverse high-speed jet nozzle 4.In gas drilling, shaft bottom landwaste stirs and can not fill nozzle with cleaning runner 11, because its ejection air-flow velocity is lower, and landwaste all returns from landwaste suction pipe 10, avoids high velocity air and makes the problems such as the borehole wall erosion at nearly drill bit place is collapsed, well off-design track, drill bit ice bag.This part is sand pump.
Reverse high-speed jet nozzle 4 sprays high energy-gathering jetting, produce negative pressure at mixing chamber 9 and entrainment landwaste, landwaste is imported high energy-gathering jetting at mixing chamber 9 and trunnion 3 place, high energy-gathering jetting dissociates at the accelerating tube 8 that dissociates and is with the landwaste of microcrack, realization is dissociated fragmentation, the surge that collision between alternate and particle, attrition produce and shearing force cause the fragmentation of particle, and realize the acceleration to landwaste.High speed landwaste high speed impact pulverizes target body 7, utilizes instant impact, gas wedge to pulverize landwaste.Fine rock chips with microcrack is pulverized through multiple reflections collision further at crushing bin 2, enters annular space after its speed lowers by bypass.This part is jet mill.
Claims (6)
1. a horizontal well safe and efficient gas drilling jet mill drill bit, comprise PDC drill bit, PDC drill bit wing, it is characterized in that at the chip area eliminating PDC bit gauge protection position, and installed jet mill device additional and high concentration turbulent flow takes out sand device at PDC drill bit internal, therefore jet mill drill bit mainly comprises: jet mill portion, and high concentration turbulent flow takes out sand portion;
Described jet mill portion, comprises reverse high-speed jet nozzle, mixing chamber, trunnion, landwaste dissociates accelerating tube, pulverize target body, crushing bin and bypass; Reverse high-speed jet nozzle entrance is communicated with the sprue of drill bit, the jet expansion of reverse high-speed jet nozzle is positioned at mixing chamber, mixing chamber and trunnion are docked and connected, trunnion and the landwaste accelerating tube that dissociates is docked and connected, landwaste dissociate accelerating tube outlet be communicated with crushing bin, be equipped with in crushing bin pulverize target body face landwaste dissociate accelerating tube outlet, crushing bin is communicated with bypass;
Described high concentration turbulent flow takes out sand portion, comprises shaft bottom landwaste and stirs and cleaning runner, landwaste suction pipe and bit nozzle; Shaft bottom landwaste stirs and is communicated with the sprue of drill bit with cleaning flow channel entry point, and shaft bottom landwaste stirs and is connected with the cleaning runner of drill bit end with cleaning runner exit; Landwaste suction pipe entrance is connected with the outer end of drill bit end chip area, and the outlet of landwaste suction pipe is connected with mixing chamber.
2. horizontal well according to claim 1 safe and efficient gas drilling jet mill drill bit, is characterized in that shaft bottom landwaste stirs and is divided into rear three runners with cleaning runner by previous runner; The sprue of previous flow passage PDC drill bit is pipe; Rear three runners are the pipe that point diameter little rear end diameter is large, and one end that diameter is large connects the cleaning runner of drill bit end, and is unsymmetrical arrangement.
3. horizontal well according to claim 1 safe and efficient gas drilling jet mill drill bit, is characterized in that landwaste suction pipe is pipe, and entrance connects the outer end of drill bit end chip area, and arranges near cutting teeth side.
4. horizontal well according to claim 1 safe and efficient gas drilling jet mill drill bit, is characterized in that the landwaste accelerating tube that dissociates is pipe, and its axis is 135 ° of angles with the target surface pulverizing target body.
5. horizontal well according to claim 1 safe and efficient gas drilling jet mill drill bit, is characterized in that the shape of crushing bin is tetragonal body, and its cross section is that described landwaste dissociates the external square in accelerating tube cross section.
6. horizontal well safe and efficient gas drilling jet mill drill bit according to claim 1 or 5, it is characterized in that bypass is pipe, its cross section is the circumscribed circle of described crushing bin cross section.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320799366.0U CN204040915U (en) | 2013-12-09 | 2013-12-09 | horizontal well safe and efficient gas drilling jet mill drill bit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320799366.0U CN204040915U (en) | 2013-12-09 | 2013-12-09 | horizontal well safe and efficient gas drilling jet mill drill bit |
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| Publication Number | Publication Date |
|---|---|
| CN204040915U true CN204040915U (en) | 2014-12-24 |
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Family Applications (1)
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|---|---|---|---|
| CN201320799366.0U Withdrawn - After Issue CN204040915U (en) | 2013-12-09 | 2013-12-09 | horizontal well safe and efficient gas drilling jet mill drill bit |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103628822A (en) * | 2013-12-09 | 2014-03-12 | 中国石油大学(北京) | Safe and efficient gas drilling jet flow abrasive drilling bit of horizontal well |
| CN107386987A (en) * | 2017-08-23 | 2017-11-24 | 中国石油大学(北京) | Interior chip removal jet stream decompression drill bit |
| CN107642335A (en) * | 2017-10-27 | 2018-01-30 | 中国水利水电第十工程局有限公司 | Can in interbedding of soft and hard rocks rock fast drilling PDC drill bit |
-
2013
- 2013-12-09 CN CN201320799366.0U patent/CN204040915U/en not_active Withdrawn - After Issue
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103628822A (en) * | 2013-12-09 | 2014-03-12 | 中国石油大学(北京) | Safe and efficient gas drilling jet flow abrasive drilling bit of horizontal well |
| CN103628822B (en) * | 2013-12-09 | 2016-01-20 | 中国石油大学(北京) | Horizontal well safe and efficient gas drilling jet mill drill bit |
| CN107386987A (en) * | 2017-08-23 | 2017-11-24 | 中国石油大学(北京) | Interior chip removal jet stream decompression drill bit |
| CN107386987B (en) * | 2017-08-23 | 2023-09-26 | 中国石油大学(北京) | Internal chip removal jet flow pressure reducing drill bit |
| CN107642335A (en) * | 2017-10-27 | 2018-01-30 | 中国水利水电第十工程局有限公司 | Can in interbedding of soft and hard rocks rock fast drilling PDC drill bit |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20141224 Effective date of abandoning: 20160120 |
|
| C25 | Abandonment of patent right or utility model to avoid double patenting |