CN109441360A - Discharge in water plasma stock wave PDC drill bit - Google Patents
Discharge in water plasma stock wave PDC drill bit Download PDFInfo
- Publication number
- CN109441360A CN109441360A CN201811171756.7A CN201811171756A CN109441360A CN 109441360 A CN109441360 A CN 109441360A CN 201811171756 A CN201811171756 A CN 201811171756A CN 109441360 A CN109441360 A CN 109441360A
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- Prior art keywords
- drill bit
- discharge
- wave
- rock
- water plasma
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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
- 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
-
- 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
-
- 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
Abstract
The present invention is a kind of discharge in water plasma stock wave PDC drill bit, including drill body, the circumferentially spaced setting drill bit wing in one end of drill body, the cutting tooth of setting energy machine cut rock on drill bit wing, drilling fluid runner is set at the center of drill body, the central ports that perforation setting is connected to the drilling fluid runner at the center of one end of drill body, connection setting centric(al) impact wave producer in central ports, the side hydrophthalmia that perforation setting is connected to the drilling fluid runner on the side wall of one end of drill body, surge generator when connection setting in hydrophthalmia, centric(al) impact wave producer and side surge generator are used to generate the discharge in water plasma stock wave of energy impact grinding rock.The drill bit is based on discharge in water plasma stock wave broken rock, supplemented by mechanical rock breaking, improves the drillability of rock, accelerates bit speed, improves hard formation efficiency of breaking rock, and bit life is high, is conducive to promote the use of.
Description
Technical field
The present invention relates to petroleum drilling engineering technical fields, more particularly to one kind is suitable for deep hard formation and abrasiveness
The discharge in water plasma stock wave PDC drill bit of layer drilling well.
Background technique
China's oil-gas exploration and development turns to Deep Oil And Gas Exploration resource from middle-shallow layer, and during deep-well and ultra-deep well drilling
Stratum it is fine and close, intensity is big, abrasiveness is strong, conventional PDC drill bit by the way of mechanical rock breaking, mechanical energy utilization rate is low,
Lead to that drilling speed is slow, the period is long, at high cost.Therefore it is badly in need of finding new drilling mode raising well drilling and rock crushing efficiency, realizes oil-gas reservoir
Quick, low cost development.
The present inventor based on years of experience and practice in relevant industries, proposes a kind of discharge in water plasma as a result,
Body shock wave PDC drill bit, to overcome defect existing in the prior art.
Summary of the invention
The purpose of the present invention is to provide a kind of discharge in water plasma stock wave PDC drill bits, overcome existing PDC drill bit
To the inadaptability of deep complexity bad ground drilling, the problem that bit speed is slow, low efficiency, bit life are low, the drill bit with
Based on discharge in water plasma stock wave broken rock, supplemented by mechanical rock breaking, improves the drillability of rock, accelerate bit speed, improve
Hard formation efficiency of breaking rock, bit life is high, is conducive to promote the use of.
The object of the present invention is achieved like this, a kind of discharge in water plasma stock wave PDC drill bit, including drill bit sheet
Body, the circumferentially spaced setting drill bit wing in one end of the drill body, setting can machine cut rock on the drill bit wing
Cutting tooth, drilling fluid runner is set at the center of the drill body, penetrates through and sets at the center of one end of the drill body
The central ports being connected to the drilling fluid runner are set, connection setting centric(al) impact wave producer, described in the central ports
The side hydrophthalmia that perforation setting is connected to the drilling fluid runner on the side wall of one end of drill body, the interior connection of the side hydrophthalmia are set
Setting side surge generator, the centric(al) impact wave producer and the side surge generator can impact cutting detritus for generating
The discharge in water plasma stock wave of stone.
In a preferred embodiment of the present invention, the centric(al) impact wave producer includes the first generator body, institute
The one end for stating the first generator body is inwardly arranged the first rotation semielliptical type groove, the other end of first generator body to
Interior setting can be connected to the first generator runner hole of the first rotation semielliptical type groove；The first rotation semielliptical type groove tool
There are the first focus and the second focus, first focus is located in the first rotation semielliptical type groove, second focus position
In in the minimum point of the drill bit wing and the face of rock contact；With described the on the side wall of the first rotation semielliptical type groove
The corresponding position of one focus is equipped with the first high-field electrode and the first grounding electrode, first high-field electrode and first ground connection
Electrode is arranged radially along first generator body, and first high-field electrode and first grounding electrode can act on
Drilling fluid forms discharge in water plasma stock wave, and the is arranged between first high-field electrode and first grounding electrode
One electrode gap, the center in the first electrode gap are overlapped with first focus, discharge in water plasma stock wave energy
It results from first focal point and second focal point can be converged at；First high-field electrode and the first ground connection electricity
Pole is electrically connected by the first cable with power supply unit.
In a preferred embodiment of the present invention, one end of first cable is insulated across the first generator shell
The side wall of body is electrically connected with first high-field electrode and first grounding electrode respectively, the other end of first cable with
Power supply unit electrical connection.
In a preferred embodiment of the present invention, the side surge generator includes the second generator body, described
The second rotation semielliptical type groove is inwardly arranged in one end of second generator body, and the other end of second generator body is inside
The second generator runner hole that the second rotation semielliptical type groove can be connected to is set；The second rotation semielliptical type groove has
Third focus and the 4th focus, the third focus are located in the second rotation semielliptical type groove, and the 4th focus is located at
In the minimum point of the drill bit wing and the face of rock contact；It is described second rotation semielliptical type groove side wall on the third
The corresponding position of focus is equipped with the second high-field electrode and the second grounding electrode, second high-field electrode and the second ground connection electricity
Pole is arranged radially along second generator body, and second high-field electrode and second grounding electrode can act on brill
Well liquid forms discharge in water plasma stock wave, is arranged second between second high-field electrode and second grounding electrode
Electrode gap, the center in the second electrode gap are overlapped with the third focus, and discharge in water plasma stock wave can produce
It is born in the third focal point and the 4th focal point can be converged at；Second high-field electrode and second grounding electrode
It is electrically connected by the second cable with power supply unit.
In a preferred embodiment of the present invention, one end of second cable is insulated across the second generator shell
The side wall of body is electrically connected with second high-field electrode and second grounding electrode respectively, the other end of second cable with
Power supply unit electrical connection.
In a preferred embodiment of the present invention, the first generator runner hole and the second generator runner hole
It is the taper hole that diameter is inwardly tapered from end.
In a preferred embodiment of the present invention, chip space is set between the adjacent drill bit wing.
In a preferred embodiment of the present invention, multiple cuttings are arranged on the end face of the drill bit wing
Multiple gauge teeths are arranged on the circumference side of the drill bit wing in tooth.
In a preferred embodiment of the present invention, 5 bit wings of the circumferentially spaced setting in one end of the drill body
The wing is respectively set a side hydrophthalmia between the two neighboring drill bit wing, is separately connected setting one in each side hydrophthalmia
The side surge generator；Two central ports, each central ports are set at the center of one end of the drill body
Inside it is separately connected the one centric(al) impact wave producer of setting.
In a preferred embodiment of the present invention, interior spiral shell is respectively provided on the inner wall of the central ports and the side hydrophthalmia
Being respectively provided on the outer wall of line portion, the centric(al) impact wave producer and the side surge generator can be close with the internal thread part
Seal the external thread part of connection.
From the above mentioned, discharge in water plasma stock wave PDC drill bit provided by the invention has the following beneficial effects:
Discharge in water plasma stock wave PDC drill bit of the invention is with discharge in water plasma stock wave broken rock
It is main, supplemented by mechanical rock breaking, electrohydraulic effect occurs between the electrode gap inside surge generator, generates discharge in water plasma
Body shock wave converges at drill bit wing bottom end and rock contact by the reflex of ellipsoid inside surge generator
Near focal point on face forms an impacting with high pressure area, forms broken hole and crack by shock wave fractured rock, improves rock
Drillability, reduces rock drillability, and the cutting tooth on drill bit further cuts the rock for improving drillability and cutting well
Wall protects drill body, and in deep well hard formation, shaft bottom capacity usage ratio is high, and the shock wave pressure of generation is big, accelerates drilling well speed
Degree, improves hard formation efficiency of breaking rock, and bit life is high；Side surge generator cooperates jointly with centric(al) impact wave producer, leads to
Cross the side surge generator of the multiple and different geometric parameters of reasonable Arrangement and centric(al) impact wave in the suitable position of drill body
Generator makes impacting with high pressure area cover shaft bottom, improves efficiency of breaking rock；By changing electrode gap length, electrode both end voltage, each
Generator body inner cavity geometry can control the focal point shock strength outside surge generator, to adapt to different rocks
The demand of layer improves broken rock speed and efficiency；Discharge in water plasma stock wave PDC drill bit simple process of the invention is bored
Well process safety is reliable, is conducive to promote the use of.
Detailed description of the invention
The following drawings are only intended to schematically illustrate and explain the present invention, not delimit the scope of the invention.Wherein:
Fig. 1: for the bottom view of discharge in water plasma stock wave PDC drill bit of the invention.
Fig. 2: for the main view of discharge in water plasma stock wave PDC drill bit of the invention.
Fig. 3: for the cross-sectional view of centric(al) impact wave producer of the invention.
Fig. 4: for the bottom view of centric(al) impact wave producer of the invention.
Fig. 5: for the normal axomometric drawing of centric(al) impact wave producer of the invention.
In figure:
100, discharge in water plasma stock wave PDC drill bit；
1, drill body；
2, drill bit wing；
21, cutting tooth；22, gauge teeth；
3, centric(al) impact wave producer；
31, the first generator body；32, the first rotation semielliptical type groove；33, the first generator runner hole；34, external screw thread
Portion；
4, side surge generator；
51, the first high-field electrode；52, the first grounding electrode；53, the first cable；
6, chip space.
Specific embodiment
For a clearer understanding of the technical characteristics, objects and effects of the present invention, this hair of Detailed description of the invention is now compareed
Bright specific embodiment.
As shown in Figures 1 to 5, the present invention provides a kind of discharge in water plasma stock wave PDC drill bit 100, including bores
Head ontology 1, the circumferentially spaced setting drill bit wing 2 in one end of drill body 1, setting energy machine cut rock on drill bit wing 2
Cutting tooth 21, drilling fluid runner is set at the center of drill body 1, at the center of one end of drill body 1 perforation setting with
The central ports of drilling fluid runner connection, the interior connection setting centric(al) impact wave producer 3 of central ports, one end of drill body 1
Side wall on the side hydrophthalmia that be connected to drilling fluid runner of perforation setting, surge generator 4 when being arranged, center are connected in hydrophthalmia
Surge generator 3 and side surge generator 4 are used to generate the discharge in water plasma stock wave of energy impact grinding rock.
The principle of discharge in water plasma stock wave broken rock is as follows: centric(al) impact wave producer 3 and side shock wave occur
Pulsed high voltage discharges act on drilling fluid in device 4, form TRANSIENT HIGH TEMPERATURE (tens of thousands of degree) circumference of plasma discharge channels
Liquid, the pressure in guiding discharge channel sharply increase, and pressure is generated in drilling fluid and is up to 103~104The shock wave of MPa is made
For rock, when the stress that rock is subject to is more than its compression strength, rock surface generates broken hole, later in rock interior shape
At stress wave, tensile stress is generated in stress wave propagation, when tensile stress is greater than Tensile Strength of Rock, rock interior generates big
Measure crackle, discharge in water plasma stock wave drilling technology can direct fractured rock, rock drillability can also be improved.
Discharge in water plasma stock wave PDC drill bit 100 of the invention is with discharge in water plasma stock wave broken rock
Based on, supplemented by mechanical rock breaking, broken hole and crack are formed by shock wave fractured rock, improves the drillability of rock, reduces rock
Rock-drillability index value, the cutting tooth on drill bit further cut the rock for improving drillability and the cutting borehole wall, protect drill body,
In deep well hard formation, shaft bottom capacity usage ratio is high, and the shock wave pressure of generation is big, accelerates bit speed, and it is broken to improve hard formation
Rock efficiency, bit life are high；Side surge generator cooperates jointly with centric(al) impact wave producer, by the suitable of drill body
Coincidence sets the side surge generator and centric(al) impact wave producer of the multiple and different geometric parameters of reasonable Arrangement, makes impacting with high pressure
Area covers shaft bottom, improves efficiency of breaking rock；100 simple process of discharge in water plasma stock wave PDC drill bit of the invention, drilling well
Process safety is reliable, is conducive to promote the use of.
Further, as shown in Fig. 3, Fig. 4 and Fig. 5, centric(al) impact wave producer 3 include the first generator body 31, first
The first rotation semielliptical type groove 32 is inwardly arranged in one end of generator body 31, and the other end of the first generator body 31 is inwardly set
Set the first generator runner hole 33 that can be connected to the first rotation semielliptical type groove 32；First rotation semielliptical type groove 32 has first
Focus F1 and the second focus F2, the first focus F1 are located at first and rotate in semielliptical type groove 32, and the second focus F2 is located at bit wing
The minimum point (minimum point of drill bit wing in drilling at first wedging stratum) of the wing on the face of rock contact, the first focus F1 and
Second focus F2 is located on the long axis of the first rotation semielliptical type groove 32, and the position of the first focus F1 and the second focus F2 can lead to
The size for crossing adjustment long axis is adjusted, and the geometric parameter of adjustment the first rotation semielliptical type groove 32 makes the coke of the second focus F2
Area is located in the minimum point of drill bit wing and the face of rock contact, and the shock wave after can making convergence destroys rock.First rotation half
Position corresponding with first focus is equipped with the first high-field electrode 51 and the first grounding electrode 52 on the side wall of ellipsoid type groove 32,
First high-field electrode 51 and the first grounding electrode 52 being arranged radially along the first generator body 31, the first high-field electrode 51 and
One grounding electrode 52 can act on drilling fluid and form discharge in water plasma stock wave, the first high-field electrode 51 and the first ground connection
First electrode gap is set between electrode 52, and the center in first electrode gap is overlapped with the first focus F1, discharge in water plasma
Body shock wave energy results from the first focal point and can converge at the second focal point；First high-field electrode 51 and the first grounding electrode 52
It is electrically connected by the first cable 53 with power supply unit (power supply unit, the prior art in downhole generator or well).First high-voltage electricity
Pole 51 and the first grounding electrode 52 are placed at the first focus F1 of the first rotation semielliptical type groove 32, when drillng operation, drilling fluid
The first rotation semielliptical type groove 32 is flowed into through drilling fluid runner, the first generator runner hole 33, utilizes 51 He of the first high-field electrode
First grounding electrode 52 (high-field electrode and grounding electrode) carries out pulsed high voltage discharges in drilling fluid, forms plasma discharge
TRANSIENT HIGH TEMPERATURE (tens of thousands of degree) the circumference liquid in channel, the pressure in guiding discharge channel are sharply increased, are produced in drilling fluid
Raw pressure is up to 103~104The shock wave of MPa, shock wave near zone at the second focus F2 after shaped reflector reflects
(Jiao Qu) convergence, improves shock wave peak pressure, forms powerful impacting with high pressure area, when the stress that rock is subject to is more than its resistance to compression
Rock surface generates broken hole when intensity, forms stress wave in rock interior later, generates tensile stress in stress wave propagation,
When tensile stress is greater than Tensile Strength of Rock, rock interior generates a large amount of crackles, discharge in water plasma stock wave drilling well skill
Art can direct fractured rock, rock drillability can also be improved.By changing first electrode gap length, electrode both ends electricity
Pressure, 31 inner cavity geometry of the first generator body (long axis and short axle of the first rotation semielliptical type groove 32) can control second
Shock strength at focus F2 improves broken rock speed and efficiency to adapt to the demand of different rock-layers.
As shown in figure 3, in the present embodiment, one end of the first cable 53 is insulated across the side of the first generator body 31
Wall is electrically connected with the first high-field electrode 51 and the first grounding electrode 52 respectively, and the other end of the first cable 53 is electrically connected with power supply unit
It connects.
Further, side surge generator is (identical as 3 structure type of centric(al) impact wave producer, but there are geometric parameters
Number difference, can refer to the structure of Fig. 3 to Fig. 5) it include the second generator body, one end of the second generator body is inwardly arranged the
Two rotation semielliptical type grooves, the other end of the second generator body, which is inwardly arranged, can be connected to the second of the second rotation semielliptical type groove
Generator runner hole；Second rotation semielliptical type groove has third focus and the 4th focus, and third focus is located at the second rotation half
In ellipsoid type groove, the 4th focus is located in the minimum point of drill bit wing and the face of rock contact；Third focus and the 4th focus position
In on the long axis of the second rotation semielliptical type groove, the position of third focus and the 4th focus can by adjusting long axis size into
Row adjustment, the geometric parameter of adjustment the second rotation semielliptical type groove, makes the Jiao Qu of the 4th focus be located at the minimum point of drill bit wing
On the face of rock contact, the shock wave after can making convergence destroys rock.The major axis dimension of second rotation semielliptical type groove is greater than
The major axis dimension of first rotation semielliptical type groove 32, so that the 4th focus can reach the minimum point and rock contact of drill bit wing
Face on.Position corresponding with third focus is equipped with the second high-field electrode and second and connects on the side wall of second rotation semielliptical type groove
Ground electrode, the second high-field electrode and the second grounding electrode being arranged radially along the second generator body, the second high-field electrode and
Two grounding electrodes can act on drilling fluid and form discharge in water plasma stock wave, the second high-field electrode and the second grounding electrode
Between second electrode gap is set, the center in second electrode gap is overlapped with third focus, discharge in water plasma stock wave
Third focal point can be resulted from and the 4th focal point can be converged at；Second high-field electrode and second grounding electrode pass through second
Cable is electrically connected with power supply unit.Second high-field electrode and second grounding electrode are placed in the of the second rotation semielliptical type groove
Three focal points, when drillng operation, drilling fluid flows into the second rotation semielliptical type through drilling fluid runner, the second generator runner hole
Slot carries out pulse height using the second high-field electrode and second grounding electrode (high-field electrode and grounding electrode) in drilling fluid
Electricity is pressed, TRANSIENT HIGH TEMPERATURE (tens of thousands of degree) circumference liquid of plasma discharge channels, the pressure in guiding discharge channel are formed
Power sharply increases, and pressure is generated in drilling fluid and is up to 103~104The shock wave of MPa, shock wave is after shaped reflector reflects
It is converged in the 4th focal point near zone (Jiao Qu), improves shock wave peak pressure, form powerful impacting with high pressure area, work as rock
Rock surface generates broken hole when the stress being subject to is more than its compression strength, forms stress wave, stress wave in rock interior later
Tensile stress is generated in communication process, when tensile stress is greater than Tensile Strength of Rock, rock interior generates a large amount of crackles, discharge in water
Plasma stock wave drilling technology can direct fractured rock, rock drillability can also be improved.By changing the second electricity
Clearance between poles length, electrode both end voltage, the second generator body inner cavity geometry (second rotation semielliptical type groove long axis and
Short axle) it can control the shock strength of the 4th focal point, to adapt to the demand of different rock-layers, improve broken rock speed and efficiency.
Side surge generator 4 and centric(al) impact wave producer 3 cooperate jointly, pass through the reasonable Arrangement in the suitable position of drill body
The side surge generator 4 and centric(al) impact wave producer 3 of multiple and different geometric parameters, make impacting with high pressure area cover shaft bottom, mention
High efficiency of breaking rock.
In the present embodiment, one end insulation of the second cable is high with second respectively across the side wall of the second generator body
Piezoelectricity pole and the electrical connection of the second grounding electrode, the other end of the second cable are electrically connected with power supply unit.
In a specific embodiment of the invention, the first generator runner hole and the second generator runner hole be diameter from
The taper hole that end is inwardly tapered.
Further, as shown in Fig. 2, chip space 6 is arranged between adjacent drill bit wing 2, convenient for rock debris in drilling process
Discharge, avoid rock debris block rock drilling.
Further, as shown in Fig. 2, multiple cutting tooths 21 are arranged on the end face of drill bit wing 2, multiple cutting tooths 21 are pressed
According to the end face for being centainly regularly distributed on drill bit wing 2；Multiple gauge teeths 22 are arranged on the circumference side of drill bit wing 2, it is more
A gauge teeth 22 is regularly distributed on 2 outer surface of drill bit wing according to certain.Drill bit wing 2 is rotated with drill body 1, cutting
Tooth 21 and gauge teeth 22 cut to scrape jointly cuts rock, achievees the purpose that mechanical drilling.
In a specific embodiment of the invention, 5 drill bit wings of the circumferentially spaced setting in one end of drill body are adjacent
One side hydrophthalmia is respectively set between two drill bit wings, setting one side surge generator is separately connected in each side hydrophthalmia；Drill bit
Two central ports are set at the center of one end of ontology, one centric(al) impact wave of setting is separately connected in each central ports and is occurred
Device.
As shown in figs. 3 and 5, in the present embodiment, it is respectively provided with internal thread part on the inner wall of central ports and side hydrophthalmia,
The external screw thread that can be tightly connected with internal thread part is respectively provided on the outer wall of centric(al) impact wave producer 3 and side surge generator 4
Portion 34.
When carrying out rock drilling using discharge in water plasma stock wave PDC drill bit 100 of the invention, part drilling fluid
The first rotation semielliptical type groove 32, the first high-field electrode 51 and first are flowed into through drilling fluid runner, the first generator runner hole 33
(the first focal point) generates discharge in water plasma spherical surface shock wave by electrohydraulic effect between grounding electrode 52, and shock wave exists
First rotation 32 internal reflection of semielliptical type groove (utilizing the reflex of ellipsoid), converges at the second focus F2 near zone,
Form impacting with high pressure area；Part drilling fluid flows into the second rotation semielliptical type groove through drilling fluid runner, the second generator runner hole,
(third focal point) generates discharge in water plasma ball by electrohydraulic effect between second high-field electrode and the second grounding electrode
Face shock wave, shock wave rotate the internal reflection of semielliptical type groove second, converge at the 4th near focal point region, form high pressure punching
Hit area；The discharge in water plasma stock wave fractured rock shape that centric(al) impact wave producer 3 and side surge generator 4 generate
At broken hole and crack, improve the drillability of rock；Meanwhile drill bit wing 2 is rotated with drill body 1, cutting tooth 21 and gauge
Tooth 22 cuts to scrape jointly cuts rock, completes mechanical-assisted broken rock.
From the above mentioned, discharge in water plasma stock wave PDC drill bit provided by the invention has the following beneficial effects:
Discharge in water plasma stock wave PDC drill bit of the invention is with discharge in water plasma stock wave broken rock
It is main, supplemented by mechanical rock breaking, electrohydraulic effect occurs between the electrode gap inside surge generator, generates discharge in water plasma
Body shock wave converges at drill bit wing bottom end and rock contact by the reflex of ellipsoid inside surge generator
Near focal point on face forms an impacting with high pressure area, forms broken hole and crack by shock wave fractured rock, improves rock
Drillability, reduces rock drillability, and the cutting tooth on drill bit further cuts the rock for improving drillability and cutting well
Wall protects drill body, and in deep well hard formation, shaft bottom capacity usage ratio is high, and the shock wave pressure of generation is big, accelerates drilling well speed
Degree, improves hard formation efficiency of breaking rock, and bit life is high；Side surge generator cooperates jointly with centric(al) impact wave producer, leads to
Cross the side surge generator of the multiple and different geometric parameters of reasonable Arrangement and centric(al) impact wave in the suitable position of drill body
Generator makes impacting with high pressure area cover shaft bottom, improves efficiency of breaking rock；By changing electrode gap length, electrode both end voltage, each
Generator body inner cavity geometry can control the focal point shock strength outside surge generator, to adapt to different rocks
The demand of layer improves broken rock speed and efficiency；Discharge in water plasma stock wave PDC drill bit simple process of the invention is bored
Well process safety is reliable, is conducive to promote the use of.
The foregoing is merely the schematical specific embodiment of the present invention, the range being not intended to limit the invention.It is any
Those skilled in the art, made equivalent changes and modifications under the premise of not departing from design and the principle of the present invention,
It should belong to the scope of protection of the invention.
Claims (10)
1. a kind of discharge in water plasma stock wave PDC drill bit, including drill body, one end of the drill body is circumferentially
Drill bit wing is arranged in interval, the cutting tooth of setting energy machine cut rock, the center of the drill body on the drill bit wing
Place's setting drilling fluid runner, which is characterized in that perforation setting and the drilling well liquid stream at the center of one end of the drill body
The central ports of road connection, the interior connection setting centric(al) impact wave producer of the central ports, one end of the drill body
The side hydrophthalmia that perforation setting is connected to the drilling fluid runner on side wall, described shock wave occurs when connection setting in hydrophthalmia
Device, the centric(al) impact wave producer and the side surge generator are used to generate the discharge in water etc. of energy impact grinding rock
Gas ions shock wave.
2. discharge in water plasma stock wave PDC drill bit as described in claim 1, which is characterized in that the centric(al) impact
Wave producer includes the first generator body, and the first rotation semielliptical type is inwardly arranged in one end of first generator body
The first generator that can be connected to the first rotation semielliptical type groove is inwardly arranged in slot, the other end of first generator body
Runner hole；The first rotation semielliptical type groove has the first focus and the second focus, and first focus is located at described first
It rotates in semielliptical type groove, second focus is located in the minimum point of the drill bit wing and the face of rock contact；Described
Position corresponding with first focus is equipped with the first high-field electrode and the first ground connection electricity on the side wall of one rotation semielliptical type groove
Pole, first high-field electrode and the first grounding electrode being arranged radially along first generator body, described first
High-field electrode and first grounding electrode can act on drilling fluid and form discharge in water plasma stock wave, and described first is high
First electrode gap, the center in the first electrode gap and described first are set between piezoelectricity pole and first grounding electrode
Focus is overlapped, and discharge in water plasma stock wave can result from first focal point and can converge at second focus
Place；First high-field electrode and first grounding electrode are electrically connected by the first cable with power supply unit.
3. discharge in water plasma stock wave PDC drill bit as claimed in claim 2, which is characterized in that first cable
One end insulation across first generator body side wall respectively with first high-field electrode and it is described first ground connection electricity
Pole electrical connection, the other end of first cable are electrically connected with power supply unit.
4. discharge in water plasma stock wave PDC drill bit as claimed in claim 2, which is characterized in that the side shock wave
Generator includes the second generator body, and the second rotation semielliptical type groove is inwardly arranged in one end of second generator body,
The the second generator stream that can be connected to the second rotation semielliptical type groove is inwardly arranged in the other end of second generator body
Road hole；The second rotation semielliptical type groove has third focus and the 4th focus, and the third focus is located at second rotation
Turn in semielliptical type groove, the 4th focus is located in the minimum point of the drill bit wing and the face of rock contact；Described second
It rotates position corresponding with the third focus on the side wall of semielliptical type groove and is equipped with the second high-field electrode and the second grounding electrode,
Second high-field electrode and the second grounding electrode being arranged radially along second generator body, second high pressure
Electrode and second grounding electrode can act on drilling fluid and form discharge in water plasma stock wave, second high-voltage electricity
Second electrode gap, the center in the second electrode gap and the third focus are set between pole and second grounding electrode
It is overlapped, discharge in water plasma stock wave can result from the third focal point and can converge at the 4th focal point；Institute
The second high-field electrode and second grounding electrode is stated to be electrically connected by the second cable with power supply unit.
5. discharge in water plasma stock wave PDC drill bit as claimed in claim 4, which is characterized in that second cable
One end insulation across second generator body side wall respectively with second high-field electrode and it is described second ground connection electricity
Pole electrical connection, the other end of second cable are electrically connected with power supply unit.
6. discharge in water plasma stock wave PDC drill bit as claimed in claim 4, which is characterized in that described first occurs
Device runner hole and the second generator runner hole are the taper hole that diameter is inwardly tapered from end.
7. discharge in water plasma stock wave PDC drill bit as described in claim 1, which is characterized in that the adjacent drill bit
Chip space is set between wing.
8. discharge in water plasma stock wave PDC drill bit as described in claim 1, which is characterized in that the drill bit wing
End face on multiple cutting tooths are arranged, multiple gauge teeths are arranged on the circumference side of the drill bit wing.
9. discharge in water plasma stock wave PDC drill bit as described in claim 1, which is characterized in that the drill body
5 drill bit wings of the circumferentially spaced setting in one end, a side hydrophthalmia is respectively set between the two neighboring drill bit wing,
It is each it is described be separately connected in hydrophthalmia setting one it is described while surge generator；It is arranged at the center of one end of the drill body
Two central ports are separately connected the one centric(al) impact wave producer of setting in each central ports.
10. discharge in water plasma stock wave PDC drill bit as described in claim 1, which is characterized in that the central ports
Be respectively provided with internal thread part on the inner wall of the side hydrophthalmia, the centric(al) impact wave producer and the side surge generator
The external thread part that can be tightly connected with the internal thread part is respectively provided on outer wall.
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| CN201811171756.7A CN109441360B (en) | 2018-10-09 | 2018-10-09 | Liquid phase discharge plasma shock wave PDC drill bit |
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| CN109441360A true CN109441360A (en) | 2019-03-08 |
| CN109441360B CN109441360B (en) | 2019-12-31 |
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| CN110388206A (en) * | 2019-06-13 | 2019-10-29 | 太原理工大学 | A kind of method and apparatus that coal column is left in the residual exploiting field of plasma uplink fracturing |
| CN110552616A (en) * | 2019-09-24 | 2019-12-10 | 中国石油大学(北京) | Liquid phase discharge shock wave drilling device |
| CN111101868A (en) * | 2019-11-14 | 2020-05-05 | 中国石油大学(北京) | Jet flow PDC drill bit |
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| CN112983283A (en) * | 2019-12-18 | 2021-06-18 | 新奥科技发展有限公司 | Plasma torch rock breaking composite drill bit and plasma torch rock breaking composite drill |
| CN113216853A (en) * | 2020-01-21 | 2021-08-06 | 新奥科技发展有限公司 | Composite drill bit and rock drilling device |
| CN113216853B (en) * | 2020-01-21 | 2023-04-11 | 新奥科技发展有限公司 | Composite drill bit and rock drilling device |
| CN112227959A (en) * | 2020-10-09 | 2021-01-15 | 江苏刘一刀精密机械有限公司 | Drill bit with self-lubricating protection function |
| CN112227959B (en) * | 2020-10-09 | 2023-09-22 | 江苏刘一刀精密机械有限公司 | Drill bit with self-lubricating protection function |
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| CN112593849A (en) * | 2020-12-16 | 2021-04-02 | 西南石油大学 | Electric pulse-mechanical composite rock breaking drill bit for deep difficult-to-drill stratum |
| CN113187405A (en) * | 2021-06-02 | 2021-07-30 | 辽宁石油化工大学 | Hydraulic drive multidimensional plasma combined drill bit and drilling method thereof |
| CN113187405B (en) * | 2021-06-02 | 2023-08-18 | 辽宁石油化工大学 | Hydraulic drive multi-dimensional plasma combined drill bit and drilling method thereof |
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