CN106761388A - Rotary impact type drilling tool - Google Patents
Rotary impact type drilling tool Download PDFInfo
- Publication number
- CN106761388A CN106761388A CN201710125553.3A CN201710125553A CN106761388A CN 106761388 A CN106761388 A CN 106761388A CN 201710125553 A CN201710125553 A CN 201710125553A CN 106761388 A CN106761388 A CN 106761388A
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- current divider
- rotary impact
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- hammer
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- 238000005553 drilling Methods 0.000 title claims abstract description 67
- 230000007246 mechanism Effects 0.000 claims abstract description 66
- 230000005540 biological transmission Effects 0.000 claims abstract description 39
- 238000009527 percussion Methods 0.000 claims abstract description 36
- 230000033001 locomotion Effects 0.000 claims abstract description 14
- 239000007788 liquid Substances 0.000 claims description 83
- 239000012530 fluid Substances 0.000 claims description 36
- 230000001681 protective effect Effects 0.000 claims description 24
- 238000003860 storage Methods 0.000 claims description 12
- 230000037361 pathway Effects 0.000 claims description 10
- 229910000831 Steel Inorganic materials 0.000 claims description 9
- 238000000034 method Methods 0.000 claims description 9
- 239000010959 steel Substances 0.000 claims description 9
- 230000008569 process Effects 0.000 claims description 7
- 210000004907 gland Anatomy 0.000 claims description 6
- 239000012188 paraffin wax Substances 0.000 claims description 5
- 238000009434 installation Methods 0.000 claims description 4
- 229910001105 martensitic stainless steel Inorganic materials 0.000 claims description 4
- 230000013011 mating Effects 0.000 claims description 4
- 230000001360 synchronised effect Effects 0.000 claims description 3
- 230000035939 shock Effects 0.000 abstract description 6
- 230000000694 effects Effects 0.000 abstract description 4
- 230000009471 action Effects 0.000 abstract description 3
- 238000009987 spinning Methods 0.000 abstract description 2
- 239000011435 rock Substances 0.000 description 15
- 238000010586 diagram Methods 0.000 description 9
- 238000005516 engineering process Methods 0.000 description 5
- 230000015572 biosynthetic process Effects 0.000 description 3
- 238000004080 punching Methods 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- 206010008469 Chest discomfort Diseases 0.000 description 2
- 241000209094 Oryza Species 0.000 description 2
- 235000007164 Oryza sativa Nutrition 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 238000006073 displacement reaction Methods 0.000 description 2
- 230000002708 enhancing effect Effects 0.000 description 2
- 230000003116 impacting effect Effects 0.000 description 2
- 230000035515 penetration Effects 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 235000009566 rice Nutrition 0.000 description 2
- 241001074085 Scophthalmus aquosus Species 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 230000000740 bleeding effect Effects 0.000 description 1
- 210000002421 cell wall Anatomy 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
- 238000010891 electric arc Methods 0.000 description 1
- 230000005520 electrodynamics Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 230000008014 freezing Effects 0.000 description 1
- 238000007710 freezing Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000008676 import Effects 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 238000010030 laminating Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 239000003129 oil well Substances 0.000 description 1
- 230000010355 oscillation Effects 0.000 description 1
- 230000003534 oscillatory effect Effects 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
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- 239000004575 stone Substances 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
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- 238000003466 welding Methods 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B4/00—Drives for drilling, used in the borehole
- E21B4/16—Plural down-hole drives, e.g. for combined percussion and rotary drilling; Drives for multi-bit drilling units
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- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Earth Drilling (AREA)
Abstract
The invention discloses a kind of rotary impact type drilling tool, including the by-pass valve assembly being sequentially connected, motor assembly, universal axle assembly and driving-shaft assembly, the driving-shaft assembly includes the internal power transmission shaft with hollow channel, one end of the power transmission shaft is connected with percussion mechanism, and the end of the percussion mechanism is connected with drill bit；The cross torsion impulsive force of certain frequency is produced by the shock of rotary impact hammer using side knock mechanism, impact of collision mechanism produces the longitudinal impact force of certain frequency by the shock that impact of collision is hammered into shape, both combine to form three-dimensional motion impact effect, and rotated by by power transmission shaft, the action of spinning of three-dimensional impact pattern is formed, bit speed and drilling efficiency is improved.
Description
Technical field
The present invention relates to oil-well drilling equipment, more particularly to a kind of rotary impact type drilling tool.
Background technology
How to improve bit speed is the technical barrier that current countries in the world are being studied, particularly, with the increasing of well depth
Plus, waterpower is lost along journey and increases, and shaft bottom drill bit can drastically decline with water energy, hydraulic drilling and clear rock reduced capability, causes deep-well
The problems such as drilling speed is low, bit wear is fast, viscous card is serious；In addition, in order to improve oil recovery efficiency, horizontal well, Multilateral Wells, big displacement
Well, increasingly paid attention to from formula well etc., current well is more and more irregular, frictional resistance and moment of torsion are big, and slide drilling is difficult, well
Expanded range is small.
The core technology content for improving bit speed is how to improve the efficiency of breaking rock of drill bit, around the technology contents, is removed
Beyond research bit technique, water-jet breaking technique for rock and other drilling technologies, recent decades have also been proposed rotating drilling
Technology, and substantial amounts of technical research and scene application have been carried out, its principle is to connect (the rotation of a hydraulic impacter on drill bit top
Rush joint), in drilling process, drill bit under certain the pressure of the drill with drill string rotating, while also be subject to from impactor high frequency punching
Hit stress, and the fractured rock under the synergy for rotating and impacting.
Rotary impact is a kind of broken rock mode for effectively improving efficiency of breaking rock and rate of penetration, rotary impact common at present
Drilling tool is broadly divided into hydrodynamic, pneumatic type and electrodynamic type etc., mouth of being used widely in Rock and Soil Drilling Engineering.
One kind is disclosed in notification number is for the patent of invention of CN104033113B to spin helicoid hydraulic motor, mud is by bypass
Valve chest inside enters inside helicoid hydraulic motor, then the hydraulic energy transfer of mud is rotated for rotor machinery by motor portion
Can, rotor is rotated and drive successively universal drive shaft and the rotation of upper axis body, due to being spline connection between upper axis body and lower axis body, cam,
Cam chair and lower axis body are sequentially connected, and lower axis body and cam can also rotate with upper axis body, are coordinated due to cam and roller
Architectural feature, can promote lower axis body to pump in cam rotary course, produce the stabilization of certain frequency and size
Soft impulsive force.Above-mentioned patent drives the axially reciprocating of lower axle body to produce axial vibration to rush by cam and the cooperation of roller
Rotating drilling pattern is realized in the rotation hit with reference to lower axis body, also needs to produce the reciprocal fortune of axial direction in rotation process due to lower axis body
It is dynamic so that very limited in the raising of bit speed and drilling efficiency, and drill bit rock breaking capacity is poor when running into the hard thing such as rock.
The content of the invention
It is an object of the invention to provide a kind of rotary impact type drilling tool, mutually tied with speed enhancing apparatus using helicoid hydraulic motor
Close, reach rotating drilling pattern, speed enhancing apparatus produce three-dimensional vibrating impact laterally and longitudinally, greatly using drilling fluid as power
Width improves bit speed and drilling efficiency.
Above-mentioned technical purpose of the invention technical scheme is that：
A kind of rotary impact type drilling tool, including the by-pass valve assembly, anti-lost assembly, motor assembly, universal being sequentially connected
Axle assembly and driving-shaft assembly, the driving-shaft assembly include the internal power transmission shaft with hollow channel, the one of the power transmission shaft
End is connected with percussion mechanism, and the end of the percussion mechanism is connected with drill bit；The percussion mechanism includes longitudinal direction setting up and down
Beater mechanism and side knock mechanism, the side knock mechanism include rotary impact hammer seat, are rotationally connected with rotary impact hammer
Rotary impact hammer in seat and the first steering current divider in rotary impact hammer；The impact of collision mechanism includes longitudinal direction
Jump bit seat, the impact of collision portion in impact of collision hammer seat and the linkage portion driven by the first steering current divider, it is described
Rotary impact hammer crankmotion under the first driving for turning to current divider, while drive of the impact of collision portion in linkage portion
Dynamic lower reciprocating longitudinal motion.
By using above-mentioned technical proposal, the mud that will be pumped out using slush pump flows through by-pass valve assembly, and to enter into motor total
Into interior, certain pressure differential is formed in the import and export of motor assembly, promote the rotor rotation of motor, and moment of torsion and rotating speed are led to
Cross universal drive shaft and power transmission shaft is delivered in percussion mechanism, drive percussion mechanism to rotate, percussion mechanism is together rotated with drill bit and carried out
Broken rock；The kinetic energy of drilling fluid is converted into rotary impact hammer and impact of collision portion by percussion mechanism using drilling fluid as motive power
High frequency and impact energy by a small margin, and by as produced by rotary impact hammer and impact of collision mechanism 3 D stereo impact
To avoiding on drill bit producing glutinous one phenomenon slided, while improving rate of penetration and drilling efficiency, drilling efficiency is same to energy transmission
Well, 2-3 times that PDC drill bit is used alone with layer.
Preferably, the upper and lower ends that the impact of collision portion hammers into shape including impact of collision hammer and located at impact of collision
Upper striker and lower striker, the first driving chamber, the lower striker are formed between the upper striker and impact of collision hammer
The second driving chamber is formed between impact of collision hammer；First low pressure liquid that is internally provided with of the first steering current divider leads to
Road, is provided with the linkage portion and leads to the highly pressurised liquid passage and the second low pressure liquid of the first low pressure liquid channel connection
Road, when in first driving chamber and the second driving chamber is with the second low pressure liquid channel connection, described first
Another in driving chamber and second driving chamber drives the axial direction that impact of collision is hammered into shape to transport with the highly pressurised liquid channel connection
It is dynamic.
By using above-mentioned technical proposal, cleaner for high-pressure drilling fluid circulation is passed into the first driving chamber or the second driving chamber, makes
The first driving chamber and the second driving chamber formation high pressure chest respectively staggeredly and low pressure chamber, cause promotion in the first driving chamber with
Impact of collision hammer longitudinally reciprocating motion between second driving chamber, striker produces the high frequency vibrating of longitudinal direction with lower striker in shock
It is dynamic, it is significantly high in oscillation intensity, further improve the rock breaking capacity of drill bit.
Preferably, the linkage portion includes the intervalve in impact of collision hammer and in intervalve the
Two turn to current divider, and the second steering current divider is connected and synchronous axial system with the first steering current divider；Opened on the intervalve
It is provided with the first inlet opening connected with the first driving chamber and the second inlet opening connected with the second driving chamber, first feed liquor
Hole is connected with the first driving chamber, and the second inlet opening is connected with the second driving chamber, and described second turns to correspondence and first on current divider
The position of inlet opening and the second inlet opening is respectively arranged with the first feed tube and the second feed tube, wherein the first inlet opening and second
Inlet opening is opened up in the circumferential misalignment of intervalve.
By using above-mentioned technical proposal, second turns to current divider rotates in the first drive for turning to current divider, located at the
Two turn to the first feed tube and the second feed tube on current dividers alternately with the first inlet opening being opened on intervalve and the
Two inlet openings are connected, and the first inlet opening, the second inlet opening are connected with the first driving chamber, the second driving chamber respectively so that the
Entering into the first driving chamber and the second driving chamber for cleaner for high-pressure drilling fluid circulation is realized in the rotation process of two steering current dividers, is made
The first driving chamber and the second driving chamber produce a pressure differential so that impact of collision hammer more smooth can carry out axial reciprocating
Motion.
Preferably, leave spacing between the second steering current divider and intervalve and form the second described low pressure liquid
Body passage, the highly pressurised liquid passage is formed inside the second steering current divider, wherein turning to current divider near first in second
The one end for turning to current divider offers the 3rd inlet opening, and the 3rd inlet opening is respectively communicated with the first low pressure liquid passage and second
Low pressure liquid passage.
By using above-mentioned technical proposal, the drilling fluid in the first low pressure liquid passage is entered using the 3rd inlet opening
To the second low pressure liquid passage, the drilling fluid in the second low pressure liquid passage is caused under the second rotation for turning to current divider
Can enter into the first driving chamber or the second driving chamber and cause in the first driving chamber or the one of cavity of the second driving chamber
A low pressure chamber is formed, is just high pressure chest with respect to another so that the first driving chamber forms pressure differential with the second driving chamber, drives
Impact of collision hammer is moved back and forth.
Preferably, axle bed is provided with the impact of collision hammer seat, described second turns between current divider and axle bed
Annular groove is formed, some steel balls are provided with the annular groove.
By using above-mentioned technical proposal, the setting of steel ball causes that turning to current divider first drives second to turn to current divider
Rolling friction is converted into during rotation, is reduced and the friction between impact of collision hammer seat is damaged, improve service life.
Preferably, the side knock mechanism also includes the upper press cover being fixed in rotary impact hammer seat and pushes
Lid, the rotary impact hammer is located between upper press cover and lower cover, and one end of the first steering current divider is connected to lower cover
On, the other end stretches out through upper press cover, between the outer wall and rotary impact hammer of the upper and lower gland, the first steering current divider
Steel ball is provided with mating surface.
By using above-mentioned technical proposal, the setting of upper lower cover will turn to jump bit and first and turn to diverter shaft first
To spacing, and the setting of steel ball reduces rotary impact hammer and first turns to frictional force in the rotary course of current divider, improves rotation
Turn the service life of jump bit and the first steering current divider.
Preferably, be further opened with two groups of symmetrical liquid inlet and outlet passages on rotary impact hammer seat, every group enter,
Liquid outlet channel includes two feed pathways and the liquid outlet channel between two feed pathways, and the upper press cover is provided with and enters
The upper hole of liquid channel connection, lower cover is provided with the lower opening connected with liquid outlet channel；Symmetrical setting in the rotary impact hammer
There are two arc bumps, the arc bump is distributed with impact block in right-angled intersection, and is offered in the both sides of arc bump
First leakage fluid dram, the both sides of the impact block offer the second leakage fluid dram, and described first turns on the outer wall of current divider symmetrically
Two partial pressure chambers are provided with, the side wall that the arc bump is placed in partial pressure chamber and in partial pressure chamber is abutted against, each partial pressure chamber
Both sides are provided with sump pit, and two liquid inlet channels are offered in the radial symmetric of the first steering current divider, the liquid inlet channel and the
The one inside connection for turning to current divider, is symmetrically arranged with two arc apocenosis passages on the lower cover, each arc discharge opeing is led to
Conducting is circulated in the first rotation process for turning to current divider in road with sump pit.
By using above-mentioned technical proposal, drilling fluid is entered into from the feed pathway being opened on rotary impact hammer seat and passed through
The upper hole of upper press cover is entered into the partial pressure chamber of the first steering current divider, promotes first to turn to current divider clockwise or counter-clockwise
Rotate, when the partial pressure cavity wall of the first steering current divider is abutted against with arc bump, jump bit is rotated and rotates realization rotation
Turn jump bit and rotary impact hammer seat between shock, when complete one-shot after, first turn to current divider on liquid inlet channel with
The second leakage fluid dram on rotary impact hammer and connect with impact chamber, drilling fluid enters into impact block and abutted against with cavity wall is impacted
Position, promote rotary impact hammer counter motion, realize reciprocating impact.
Preferably, the connection end of the power transmission shaft offers the fixing groove connected with hollow channel, the fixing groove
The protective case being made up of martensitic stain less steel is inside provided with, is offered on the inwall of the protective case multiple with spiral-distributed the
One mounting hole, ball is provided with first mounting hole, wherein the orifice diameter of the first mounting hole is less than the diameter of ball
Ball part is placed in the outside of the first mounting hole, and be provided with the first mounting hole and force ball to have all the time to depart from the
The elastic component of one mounting hole movement tendency；The percussion mechanism includes being arranged at the connector of end, the side wall of the connector
The upper position corresponding to the first mounting hole offers multiple second mounting holes, and connector is connected through a screw thread with protective case, and two
The ball that person's fixed rear portion is placed in outside installation cavity is embedded in the 3rd mounting hole.
By using above-mentioned technical proposal, power transmission shaft is using the protective case being arranged in fixing groove and the connection of percussion mechanism
Head thread is connected, and protective case is made up with high Wear-resistant corrosion-resistant performance of martensitic stain less steel, it is possible to increase transmission
Axle and the bonding strength of connector junction, more preferably pass through power transmission shaft transmitting torque；Secondly it is that connector coordinates in protective case
Afterwards, the ball for being set with helical arrangement on protective case inwall can be embedded in the second mounting hole of connector, played to power transmission shaft
Circumference with percussion mechanism is spacing, can offset part borehole wall in drilling well and, to the reactive torque produced by percussion mechanism, enter one
Step improves the transmission efficiency of torque transmission shaft.
Preferably, multiple storage tanks are offered on the inwall of the protective case, heat is installed swollen in the storage tank
Swollen bag, paraffin is provided with the thermal expansion bag.
By using above-mentioned technical proposal, percussion mechanism is changed into when rotation is driven by power transmission shaft by mechanical energy
Partial heat energy force the thermal expansion bag expanded by heating in protective case to be fitted tightly over to improve power transmission shaft on the outer wall of connector
Bonding strength between connector；Secondly after paraffin expands to a certain extent, whole thermal expansion bag can be burst so that stone is applied
The junction of protective case and connector is covered, waterproof action is played, corrosion of the drilling fluid in junction is reduced, the use of device is improved
Life-span, and preferably percussion mechanism is transferred torque to by power transmission shaft.
Preferably, the storage tank is in on the helix of spiral-distributed multiple first mounting holes, and each
Storage tank is respectively positioned between adjacent two first mounting holes.
By using above-mentioned technical proposal, storage tank and the first mounting hole interval helical arrangement so that on percussion mechanism
Connector is subject to the pressure of gathering formula, and closes the dual limit that ball plays radial direction and circumference to connector using thermal expansion inclusion
Position, the threaded connection between connector and fixing groove plays axial limiting so that both power transmission shaft and connector consolidating with three-dimensional
Determine mode to interconnect, power transmission shaft can be transferred torque on percussion mechanism with highest transmission efficiency, improve rotating speed.
In sum, the invention has the advantages that：
1st, side knock mechanism and impact of collision mechanism by cleaner for high-pressure drilling fluid driving work, side knock mechanism is rushed by rotating
The shock of hammer produces the cross torsion impulsive force of certain frequency, and impact of collision mechanism produces one by the shock that impact of collision is hammered into shape
Determine the longitudinal impact force of frequency, both combine and cause that whole percussion mechanism stroke in drill bit rotation process is driven is a kind of three-dimensional dynamic
Make impact effect, percussion mechanism is simultaneously rotated by power transmission shaft, form the pattern of spinning of three-dimension type oscillatory type, auxiliary drill bit breaks
Rock, improves bit speed and efficiency；
2nd, percussion mechanism utilizes multiple ball combination thermal expansion bags in spiral shell axially, circumferentially and between the two with the connection of power transmission shaft
The axial limiting of line connection, greatly improves moment of torsion transmission efficiency of the power transmission shaft to percussion mechanism so that the rotation speed of percussion mechanism
Du Genggao, further improves bit speed and efficiency.
Brief description of the drawings
Fig. 1 is the connection diagram of rotary impact type drilling tool each several part in embodiment one；
Fig. 2 is the structural representation of power transmission shaft and connector junction in embodiment one；
Fig. 3 is the structural representation of junction after power transmission shaft in embodiment one and connector fixation；
Fig. 4 is the structural representation of thermal expansion bag in embodiment one；
Fig. 5 is the sectional view of drilling speed percussion mechanism entirety in embodiment one；
Fig. 6 is the structural representation of rotary impact hammer seat in embodiment one；
Fig. 7 is the structural representation of rotary impact hammer in embodiment one；
Fig. 8 is the structural representation of the first steering current divider in embodiment one；
Fig. 9 is the schematic diagram after rotary impact hammer seat, rotary impact hammer and first steering current divider three's cooperation in embodiment one；
Figure 10 is the state diagram of intervalve and the second steering current divider in the first cooperation position in embodiment one；
Figure 11 is the state diagram of intervalve and the second steering current divider in the second cooperation position in embodiment one；
Figure 12 is schematic diagram when side knock mechanism is in the first operating position in embodiment one；
Figure 13 is schematic diagram when side knock mechanism is in the second operating position in embodiment one；
Figure 14 is schematic diagram when side knock mechanism is in three operating positions in embodiment one；
Figure 15 is schematic diagram when side knock mechanism is in four operating positions in embodiment one；
Figure 16 is schematic diagram when side knock mechanism is in five operating positions in embodiment one.
In figure：1a, by-pass valve assembly；2a, anti-lost assembly；3a, motor assembly；4a, universal axle assembly；5a, power transmission shaft are total
Into；51a, power transmission shaft；511a, hollow channel；51b, protective case；511b, the first mounting hole；512b, ball；513b, elastic component；
514b, thermal expansion bag；1b, percussion mechanism；11b, connector；111b, the second mounting hole；1c, drill bit；1st, drill-bit installing seat；2、
Side knock mechanism；21st, rotary impact hammer seat；211st, feed pathway；212nd, liquid outlet channel；213rd, chamber is impacted；2131st, slideway；
22nd, rotary impact hammer；221st, impact block；2211st, the second leakage fluid dram；2212nd, punching groove；222nd, arc bump；2221st, first row
Liquid mouthful；23rd, first current divider is turned to；231st, partial pressure chamber；232nd, sump pit；233rd, liquid inlet channel；234th, the first low pressure liquid passage；
24th, upper press cover；25th, lower cover；251st, arc apocenosis passage；3rd, impact of collision mechanism；31st, impact of collision hammer seat；32nd, longitudinal direction punching
Hit portion；321st, upper striker；322nd, lower striker；323rd, impact of collision hammer；324th, the first driving chamber；325th, the second driving chamber；
33rd, linkage portion；331st, intervalve；3311st, the first inlet opening；3312nd, the second inlet opening；332nd, second current divider is turned to；3321、
First feed tube；3322nd, the second feed tube；3323rd, highly pressurised liquid passage；3324th, the second low pressure liquid passage；3325th, the 3rd
Inlet opening；4th, nozzle；5th, steel ball；6th, axle bed.
Specific embodiment
The present invention is described in further detail below in conjunction with accompanying drawing.
Embodiment one
Referring to Fig. 1, a kind of rotary impact type drilling tool, including pass sequentially through the by-pass valve assembly 1a of threaded connection, anti-lost total
Into 2a, motor assembly 3a, universal axle assembly 4a and driving-shaft assembly 5a, above-mentioned structure is same as the prior art not to be done in detail
State.Driving-shaft assembly 5a includes a power transmission shaft 51a with hollow channel, and one end of power transmission shaft 51a is connected through a screw thread
Have a percussion mechanism 1b, percussion mechanism 1b away from the one end being connected with power transmission shaft 51a further through being threaded with drill bit 1c, the drill bit
1c is PDC drill bit.
Referring to Fig. 2 and Fig. 3, one end of power transmission shaft 51a offers fixing groove, and fixing groove is in truncated cone-shaped and and hollow channel
511a is connected, and is held for big towards one end of notch.Protective case 51b, the foreign steamer profile of protective case 51b are installed in fixing groove
Shape matches with the cell wall of fixing groove, and protective case 51b is made up of martensitic stain less steel, and is connected by welding manner and fixing groove
Connect.
Offer multiple first mounting hole 511b in a spiral manner on the inwall of protective case 51b, each first mounting hole
Ball 512b is embedded with 511b, wherein the orifice diameter of the first mounting hole 511b is less than the diameter of ball 512b so that
Ball 512b be fit into after the first mounting hole 511b without departing from；Elastic component is also equipped with the first mounting hole 511b
513b, elastic component 513b are compression spring, and one end of elastic component 513b is connected at the bottom hole of the first mounting hole 511b, the other end
Abutted with ball 512b, before ball 512b is installed, the orifice diameter of the first mounting hole 511b is larger than the straight of ball 512b
Footpath, and elastic component 513b is placed into in the first mounting hole 511b first, then will put into the first mounting hole 511b, most
The aperture to the first mounting hole 511b carries out shrinkage cavity treatment afterwards so that orifice diameter is reduced to the diameter less than ball 512b.
Multiple storage tanks are further opened with the inwall of protective case 51b, multiple storage tanks are opened in spiral-distributed multiple
On the helix of one mounting hole 511b, thermal expansion bag 514b is installed in storage tank, reference can be made to Fig. 4, thermal expansion bag 514b's
Inside is filled with paraffin, and paraffin props up whole inclusion.
The end of percussion mechanism 1b has the connector 11b coordinated with protective case 51b, and connector 11b is in truncated cone-shaped and guarantor
The inner wall shape of sheath 51b matches, and the inwall of protective case 51b is tapped with internal thread, and the outer wall of connector 11b is provided with outer spiral shell
Both line, connector 11b and protective case 51b are connected through a screw thread fixation；Multiple second is offered on the outer wall of connector 11b
Mounting hole 111b, multiple second mounting hole 111b's equally opens up in a spiral manner, and pacifies with multiple first on protective case 51b
Dress hole 511b positions correspondence, after connector 11b is connected with protective case 51b, the first mounting hole 511b and the second mounting hole 111b
An installation cavity is formed, and causes that the part that ball 512b is placed on outside the first mounting hole 511b by the effect of elastic component 513b is rolled
Pearl 512b is embedded into the second mounting hole 111b.
Referring to Fig. 5, above-mentioned percussion mechanism, including drill-bit installing seat 1, side knock mechanism 2 and impact of collision mechanism
3, drill-bit installing seat 1 is fixed on one end of side knock mechanism 2, and side knock mechanism 2 is fixed on away from brill in impact of collision mechanism 3
One end of head mounting seat 1.
Side knock mechanism 2 include rotary impact hammer seat 21, located at rotary impact hammer seat 21 in rotary impact hammer 22 with
And the first steering current divider 23 in rotary impact hammer 22, upper press cover is fixed with by screw in rotary impact hammer seat 21
24 are placed between upper press cover 24 and lower cover 25 with lower cover 25, rotary impact hammer 22, and by upper press cover 24 and lower cover 25
The axial displacement of rotary limited jump bit 22, the first steering current divider 23 is provided with nozzle 4 near one end of drill-bit installing seat 1,
The other end stretches out upper press cover 24；At mating surface between rotary impact hammer 22 and upper and lower gland 24,25 and first turn to shunting
Multiple steel balls 5 are provided with device 23 and the mating surface of upper and lower gland 24,25, to reduce the steering of rotary impact hammer 22 and first
The frictional force during rotation of current divider 23 between upper and lower gland 24,25.
Referring to Fig. 6 to Fig. 8, respectively illustrate rotary impact hammer seat 21, rotary impact hammer 22 and first and turn to current divider
23 structural representation, rotary impact hammer seat 21 is a cylinder, and two impact chambers of sector are offered in its internal symmetry
213, it is further opened with two groups of symmetrically arranged liquid inlet and outlet passages 211,212, every group of liquid inlet and outlet between two impact chambers 213
Passage 211,212 includes two feed pathways 211 and the liquid outlet channel 212 between two feed pathways 211.
The outer wall of rotary impact hammer 22 is symmetrically arranged with two impact blocks of sector 221, in the inwall of rotary impact hammer 22
Place is symmetrically arranged with two arc bumps 222, and two arc bumps 222 are just distributed with two impact blocks 221 in right-angled intersection,
Every piece of both sides of arc bump 222 offer the first leakage fluid dram 2221, and offer the second discharge opeing in the both sides of impact block 221
Mouth 2211, inside of first leakage fluid dram 2221 with the second leakage fluid dram 2211 with rotary impact hammer 22 connects.
First steering current divider 23 middle part offers the first low pressure liquid passage 234 of insertion, opens its outer wall is symmetrical
Two partial pressure chambers 231 are provided with, the both sides in each partial pressure chamber 231 offer sump pit 232；In the first footpath for turning to current divider 23
To two liquid inlet channels 233 are offered on direction, the liquid inlet channel 233 is connected with the first low pressure liquid passage 234 at middle part.
Referring to Fig. 9, after rotary impact hammer seat 21, rotary impact hammer 22 and first turns to the three of current divider 23 cooperation, rotation
Turn impact block 221 on jump bit 22 to be placed in the impact chamber 213 of rotary impact hammer seat 21, and the sector of impact block 221 is pasted
Together in the side wall in impact chamber 213；Arc bump 222 is placed in the partial pressure chamber 231 of the first steering current divider 23 on rotary impact hammer 22
Interior, the sector of same arc bump 222 fits in the side wall in partial pressure chamber 231；Secondly rotary impact hammer seat 21 after three coordinates
On feed pathway 211 the partial pressure chamber of current divider 23 can be turned to the second leakage fluid dram 2211 on rotary impact hammer 22 and first
231 are mutually conducted, rotary impact hammer seat 21 on impact chamber 213 can with the first leakage fluid dram 2221 on rotary impact hammer 22 and
Liquid inlet channel 233 on first steering current divider 23 is mutually conducted.
Fig. 5 is come back to, impact of collision mechanism 3 includes impact of collision hammer seat 31, indulging in impact of collision hammer seat 31
To impact portion 32 and linkage portion 33, wherein connector 11b is arranged on the end that seat 31 is hammered in impact of collision into shape, impact of collision hammer seat 31
Away from connector 11b one end and rotary impact hammer seat 21 one end be connected, impact of collision portion 32 include be fixed on it is vertical
To upper striker 321 and lower striker 322 in jump bit seat 31, longitudinal direction is provided between upper and lower striker 321,322
Jump bit 323, forms the first driving chamber 324 between upper striker 321 and impact of collision hammer 323, lower striker 322 is rushed with longitudinal direction
The second driving chamber 325 is formed between hammer 323.
Above-mentioned linkage portion 33 includes intervalve 331 and the second steering current divider 332 in intervalve 331, in
Between the two ends of pipe 331 fixed with upper and lower striker 321,322 respectively, second turns to one end and the side knock machine of current divider 332
The first steering current divider 23 in structure 2 is connected, and both realize synchronous axial system, and the first feed liquor is offered on intervalve 331
The inlet opening 3312 of hole 3311 and second, wherein the first inlet opening 3311 is connected with the first driving chamber 324, the second inlet opening 3312 with
Second driving chamber 325 is connected, and the first inlet opening 3311 and the second inlet opening 3312 misplace arrangement in the circumferential；At second turn
To offering the first feed tube respectively at the position for corresponding to the first inlet opening 3311 and the second inlet opening 3312 on current divider 332
3321 and second feed tube 3322, and the first feed tube 3321 and the second feed tube 3322 with the inwall phase of intervalve 331
Laminating.
Second internal run-through for turning to current divider 332 forms highly pressurised liquid passage 3323, the highly pressurised liquid passage 3323 with
First low pressure liquid passage 234 of the first steering current divider 23 is connected, and turn to current divider 332 second turns to shunting near first
One end of device 23 is provided with throttling arrangement (not shown), and high pressure liquid throttling is changed into low pressure liquid using the throttling arrangement.
In addition spacing the second low pressure liquid of formation is left between the second steering current divider 332 and the inwall of intervalve 331 to lead to
Road 3324, the 3rd inlet opening 3325 is offered in one end near the first steering current divider 23 of the second steering current divider 332, should
3rd inlet opening 3325 is respectively communicated with the first low pressure liquid passage 234 and the second low pressure liquid passage 3324.Simultaneously at second turn
An axle bed 6 is additionally provided near one end of the first steering current divider 23 to current divider 332, the axle bed 6 is fixed on impact of collision hammer
In seat 31, annular groove is formed between the second steering current divider 332 and axle bed 6, in multiple steel balls 5 are provided with annular groove, so
Reduce frictional force when the second steering current divider 332 is rotated.
The course of work of the rotary impact type drilling tool is：Slush pump squeezes into drilling fluid from by-pass valve assembly 1a, when
Reach the drilling fluid when valve body after certain pressure in by-pass valve assembly 1a is moved downward and enter into motor by bleeding off assembly 2a
In assembly 3a, rotor driven does planetary motion in stator, and the planetary motion is changed into biography by rotor by universal axle assembly 4a
The dead axle motion of moving axis 51a, power transmission shaft 51a finally drives percussion mechanism 1b and drill bit 1c to rotate broken rock.
It is specific to combine Fig. 5 and Figure 10, Figure 11, the height that partial high pressure drilling fluid is entered into the second steering current divider 332
In press liquid passage 3323, it is changed into low pressure liquid by the throttling partial pressure of throttling arrangement, and turn on current divider 332 by second
The 3rd inlet opening 3325 enter into the second low pressure liquid passage 3324.Second turns to current divider 332 turns to shunting first
Rotated under the drive of device 23, so as to circulate conducting by the second cooperation for turning to current divider 332 and intervalve 331, make the first drive
One in the dynamic driving chamber 325 of chamber 324 and second when being connected with the second low pressure liquid passage 3324, the first driving chamber 324 and the
Another in two driving chambers 325 is connected with highly pressurised liquid passage 3323.
When the second steering current divider 332 turns an angle, the second inlet opening 3312 is connected with the second feed tube 3322,
So that highly pressurised liquid passage 3323 is connected with the second driving chamber 325, cleaner for high-pressure drilling fluid is by highly pressurised liquid passage 3323, second
The feed tube 3322 of inlet opening 3312 and second is entered into the second driving chamber 325.Now, it is high pressure liquid in the second driving chamber 325
Body, is low pressure liquid in the first driving chamber 324, therefore, it can promote impact of collision hammer 323 to away from drill bit connector 1
Lateral movement.
When the second steering current divider 332 is rotated further by certain angle, the first inlet opening 3311 connects with the first feed tube 3321
Logical, so that highly pressurised liquid passage 3323 is connected with the first driving chamber 324, highly pressurised liquid is by highly pressurised liquid passage 3323, the
One inlet opening 3311 and the first feed tube 3321 are entered into the first driving chamber 324.Now, it is high pressure in the first driving chamber 324
Liquid, is low pressure liquid in the second driving chamber 325, therefore, it can impact of collision hammer 323 near the side of drill bit connector 1
Motion.And so on act, produce the longitudinal impact force of certain frequency.
With reference to Fig. 5 and Figure 12 to Figure 15, a part of drilling fluid can be gone out by through hole overflow on the first steering current divider 23
Upper hole to enter from upper press cover 24 is entered into the feed pathway 211 of rotary impact hammer seat 21, and the both sides of arc bump 222 are set
The first leakage fluid dram 2221 be respectively communicated with feed pathway 211 and liquid outlet channel 212, cleaner for high-pressure drilling fluid is entered into partial pressure chamber 231
And promote the first steering current divider 23 to rotate clockwise.
Referring specifically to Figure 13, when the arc bump 222 of rotary impact hammer 22 encounters the inwall in partial pressure chamber 231, first turn
It is corresponding to the second leakage fluid dram 2211 on the liquid inlet channel 233 and rotary impact hammer 22 of current divider 23, impact chamber 213 and liquid inlet channel
233 connections, second half of impact chamber 213 is connected with sump pit 232, arc apocenosis passage 251, and drilling fluid can be turned to through first and divided
First low pressure liquid passage 234 of stream device 23, liquid inlet channel 233, the second leakage fluid dram 2211 are entered into impact chamber 213, make rotation
Jump bit 22 is rotated counterclockwise under the promotion of drilling fluid, and drives the first steering current divider 23 to rotate counterclockwise.
Referring to Figure 14, when being stopped operating after the impact block 221 of rotary impact hammer 22 encounters the inwall in impact chamber 213, enter
Liquid passage 211 connects feed liquor with partial pressure chamber 231 by the first leakage fluid dram 2221, and the another part in partial pressure chamber 231 with go out liquid
Passage 212 connects discharge opeing, and the first steering current divider 23 is rotated counterclockwise.
Referring to Figure 15, when the arc bump 222 of rotary impact hammer 22 encounters 231 inwall of partial pressure chamber, first turns to shunting
The second leakage fluid dram 2211 on the liquid inlet channel 233 and rotary impact hammer 22 of device 23 is corresponding, now impacts chamber 213 and liquid inlet channel
233 connections, another part for impacting chamber 213 connects discharge opeing with sump pit 232, arc apocenosis passage 251, promotes rotary impact hammer
22 rotate clockwise, and drive the first steering current divider 23 to rotate clockwise.
Referring finally to Figure 16, stopped operating when after the inwall in the impact chamber 213 of impact block 221 of rotary impact hammer 22.
And so on act, produce the lateral impact forces of certain frequency.
Application Example
Using the field test situation analysis of this rotary impact type drilling tool, test period on April 1st, 2016.
Table 1：Experiment interval table
| Layer position | Top is deep (rice) | Bottom is deep (rice) |
| Group one | 210 | 485 |
| Group two | 485 | 685 |
| Group three | 685 | 966 |
| Group four | 966 | 1236 |
Table 2：The drilling speed contrast table of different drilling tools
Learnt by table 2, the drilling tool employed in embodiment one significantly improves bit speed, it is big compared to existing drilling tool speed
About lift 60% or so.By producing the cross torsion impulsive force and axial impact force of certain frequency to drill bit, a kind of three are formed
Effect of dimension action impact, and the bonding strength between power transmission shaft 51a and percussion mechanism 1b is improved, such that it is able to aid in drill bit to break
Rock, improves drill bit rock breaking capacity, improves in, the bit speed and drilling efficiency of hard formation, while can solve the problem that PDC drill bit
Viscous, sliding, bit freezing problem, slows down the torsion shake of down-hole equipment, extends drilling life of bit, by practical work process to above-mentioned
The test of drilling well percussion mechanism understand, using the drilling efficiency of the drilling well percussion mechanism be Tong Jing, with layer be used alone PDC drill bit
2-3 times, drilling efficiency is obviously improved.
This specific embodiment is only explanation of the invention, and it is not limitation of the present invention, people in the art
Member can make the modification without creative contribution to the present embodiment as needed after this specification is read, but as long as at this
All protected by Patent Law in the right of invention.
Claims (10)
1. a kind of rotary impact type drilling tool, including the by-pass valve assembly being sequentially connected（1a）, anti-lost assembly（2a）, motor
Assembly（3a）, universal axle assembly（4a）And power transmission shaft（51a）Assembly（5a）, the power transmission shaft（51a）Assembly（5a）Including inside
Power transmission shaft with hollow channel（51a）, it is characterised in that the power transmission shaft（51a）One end be connected with percussion mechanism（1b）,
The percussion mechanism（1b）End be connected with drill bit（1c）；The percussion mechanism（1b）Including impact of collision machine setting up and down
Structure（3）With side knock mechanism（2）, the side knock mechanism（2）Including rotary impact hammer（22）Seat（21）, be rotationally connected with
Rotary impact hammer（22）Seat（21）Interior rotary impact hammer（22）And located at rotary impact hammer（22）The first interior steering shunting
Device（23）；The impact of collision mechanism（3）Including impact of collision hammer（323）Seat（31）, located at impact of collision hammer（323）Seat（31）
Interior impact of collision portion（32）And turn to current divider by first（23）The linkage portion of drive（33）, the rotary impact hammer（22）
Current divider is turned to first（23）Driving under crankmotion, while the impact of collision portion（32）In linkage portion（33）'s
Drive lower reciprocating longitudinal motion.
2. rotary impact type drilling tool according to claim 1, it is characterised in that the impact of collision portion（32）Including
Impact of collision is hammered into shape（323）And located at impact of collision hammer（323）Upper and lower ends upper striker（321）With lower striker
（322）, the upper striker（321）Hammered into shape with impact of collision（323）Between be formed with the first driving chamber（324）, the lower impact
Seat（322）Hammered into shape with impact of collision（323）Between be formed with the second driving chamber（325）；Described first turns to current divider（23）It is interior
Portion is provided with the first low pressure liquid passage（234）, the linkage portion（33）Inside it is provided with and the first low pressure liquid passage
（234）The highly pressurised liquid passage of connection（3323）And the second low pressure liquid passage（3324）, when first driving chamber（324）With
Second driving chamber（325）In one with the second low pressure liquid passage（3324）During connection, first driving chamber（324）
With second driving chamber（325）In another and the highly pressurised liquid passage（3323）Connection drives impact of collision hammer
（323）Axial movement.
3. rotary impact type drilling tool according to claim 2, it is characterised in that the linkage portion（33）Including being located at
Impact of collision is hammered into shape（323）Interior intervalve（331）And located at intervalve（331）The second interior steering current divider（332）, it is described
Second turns to current divider（332）Current divider is turned to first（23）Connection and synchronous axial system；The intervalve（331）On offer
With the first driving chamber（324）First inlet opening of connection（3311）And with the second driving chamber（325）Second inlet opening of connection
（3312）, first inlet opening（3311）With the first driving chamber（324）Connection, the second inlet opening（3312）With the second driving chamber
（325）Connection, described second turns to current divider（332）Upper correspondence and the first inlet opening（3311）With the second inlet opening（3312）'s
Position is respectively arranged with the first feed tube（3321）With the second feed tube（3322）, wherein the first inlet opening（3311）Enter with second
Fluid apertures（3312）In intervalve（331）Circumferential misalignment open up.
4. rotary impact type drilling tool according to claim 3, it is characterised in that described second turns to current divider
（332）With intervalve（331）Between leave spacing and form the second described low pressure liquid passage（3324）, the highly pressurised liquid lead to
Road（3323）It is formed at the second steering current divider（332）Inside, wherein turning to current divider in second（332）Turned near first and divided
Stream device（23）One end offer the 3rd inlet opening（3325）, the 3rd inlet opening（3325）It is respectively communicated with the first low pressure liquid
Passage（234）With the second low pressure liquid passage（3324）.
5. rotary impact type drilling tool according to claim 3, it is characterised in that seat is hammered in the impact of collision into shape（31）It is interior
It is provided with axle bed（6）, described second turns to current divider（332）With axle bed（6）Between form annular groove, set in the annular groove
There are some steel balls（5）.
6. rotary impact type drilling tool according to claim 3, it is characterised in that the side knock mechanism（2）Also
Including being fixed on rotary impact hammer seat（21）Interior upper press cover（24）With lower cover（25）, the rotary impact hammer（22）Located at upper
Gland（24）With lower cover（25）Between, described first turns to current divider（23）One end be connected to lower cover（25）On, it is another
Hold through upper press cover（24）Stretch out, the upper and lower gland（24、25）Outer wall and rotary impact hammer（22）, first turn to shunting
Device（23）Between mating surface at be provided with steel ball（5）.
7. rotary impact type drilling tool according to claim 3, it is characterised in that the rotary impact hammer seat（21）On
It is further opened with two groups of symmetrical liquid inlet and outlet passages（211、212）, every group of liquid inlet and outlet passage（211、212）Enter including two
Liquid passage（211）With positioned at two feed pathways（211）Between liquid outlet channel（212）, the upper press cover（24）It is provided with and enters
Liquid passage（211）The upper hole of connection, lower cover（25）It is provided with and liquid outlet channel（212）The lower opening of connection；The rotary impact
Hammer（22）Inside it is symmetrically arranged with two arc bumps（222）, the arc bump（222）With impact block（221）Handed in cross
Fork distribution, and in arc bump（222）Both sides offer the first leakage fluid dram（2221）, the impact block（221）Both sides
Offer the second leakage fluid dram（2211）, described first turns to current divider（23）Outer wall on be symmetrically arranged with two partial pressure chambers
（231）, the arc bump（222）It is placed in partial pressure chamber（231）It is interior and in partial pressure chamber（231）Side wall abut against, each partial pressure
Chamber（231）Both sides be provided with sump pit（232）, current divider is turned in first（23）Radial symmetric offer two feed liquors
Road（233）, the liquid inlet channel（233）Current divider is turned to first（23）Inside connection, the lower cover（25）On symmetrically set
It is equipped with two arc apocenosis passages（251）, each arc apocenosis passage（251）With sump pit（232）Current divider is turned to first
（23）Rotation process in circulate conducting.
8. rotary impact type drilling tool according to claim 1, it is characterised in that the power transmission shaft（51a）Connection
End offers and hollow channel（511a）The fixing groove of connection, is provided with the guarantor being made up of martensitic stain less steel in the fixing groove
Sheath（51b）, the protective case（51b）Inwall on offer multiple with spiral-distributed first mounting hole（511b）, it is described
First mounting hole（511b）Inside it is provided with ball（512b）, wherein the first mounting hole（511b）Orifice diameter be less than ball
（512b）Diameter make ball（512b）Part can be placed in the first mounting hole（511b）Outside, and in the first mounting hole（511b）
Inside it is provided with and forces ball（512b）All the time have and depart from the first mounting hole（511b）The elastic component of movement tendency（513b）；It is described
Percussion mechanism（1b）Connector including being arranged at end（11b）, the connector（11b）Side wall on correspond to first install
Hole（511b）Position offer multiple second mounting holes（111b）, connector（11b）With protective case（51b）Connected by screw thread
Connect, and the ball that both fixed rear portions are placed in outside installation cavity（512b）It is embedded in the second mounting hole（111b）It is interior.
9. rotary impact type drilling tool according to claim 8, it is characterised in that the protective case（51b）Inwall
On offer multiple storage tanks, thermal expansion bag is installed in the storage tank（514b）, the thermal expansion bag（514b）Interior installation
There is paraffin.
10. rotary impact type drilling tool according to claim 8, it is characterised in that the storage tank is in spiral
Multiple first mounting holes of arrangement（511b）Helix on, and each storage tank is respectively positioned on adjacent two first mounting holes（511b）
Between.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710125553.3A CN106761388B (en) | 2017-03-04 | 2017-03-04 | Rotary impact type drilling tool |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710125553.3A CN106761388B (en) | 2017-03-04 | 2017-03-04 | Rotary impact type drilling tool |
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| CN107780831A (en) * | 2017-10-24 | 2018-03-09 | 西南石油大学 | Double frequency axial impact instrument |
| CN107780831B (en) * | 2017-10-24 | 2019-05-10 | 西南石油大学 | Double frequency axial impact tool |
| CN107654195B (en) * | 2017-11-13 | 2024-01-30 | 中国石油大学(华东) | Composite impact rolling self-adjusting PDC drill bit |
| CN107654195A (en) * | 2017-11-13 | 2018-02-02 | 中国石油大学(华东) | Composite impact rolls self-adjustable PDC drill bit |
| CN109930987A (en) * | 2017-12-19 | 2019-06-25 | 中石化石油工程技术服务有限公司 | A kind of mechanical liquid type rock crushing tool, the drill string of multi-load coupling |
| CN108360974B (en) * | 2018-04-12 | 2023-10-13 | 中国石油大学(北京) | Composite impact tool |
| CN108360974A (en) * | 2018-04-12 | 2018-08-03 | 中国石油大学(北京) | Composite impact tool |
| CN108756732A (en) * | 2018-08-02 | 2018-11-06 | 西南石油大学 | Circumferential impactor based on screw rod and spring |
| CN108756732B (en) * | 2018-08-02 | 2023-11-14 | 西南石油大学 | Circumferential impactor based on screw and spring |
| CN110374495A (en) * | 2019-08-26 | 2019-10-25 | 山东陆海石油技术股份有限公司 | A kind of high frequency circumferential direction impact type spiral drilling rig structure |
| CN110566120A (en) * | 2019-09-11 | 2019-12-13 | 中煤科工集团西安研究院有限公司 | Multi-power directional combined drilling tool for hard rock of coal mine underground coal seam bottom plate and hole forming method thereof |
| CN111255374A (en) * | 2020-02-21 | 2020-06-09 | 南通大学 | Anti-drill-sticking device and method for circumferential impact |
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