CN111395967A - Hydraulic harmonic high-power reinforced vibrator excited by screw - Google Patents
Hydraulic harmonic high-power reinforced vibrator excited by screw Download PDFInfo
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- CN111395967A CN111395967A CN202010281565.7A CN202010281565A CN111395967A CN 111395967 A CN111395967 A CN 111395967A CN 202010281565 A CN202010281565 A CN 202010281565A CN 111395967 A CN111395967 A CN 111395967A
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- 230000003014 reinforcing effect Effects 0.000 claims abstract description 17
- 210000002445 nipple Anatomy 0.000 claims abstract description 14
- 230000002787 reinforcement Effects 0.000 claims abstract description 9
- 238000004891 communication Methods 0.000 claims description 21
- 238000000034 method Methods 0.000 claims description 9
- 238000007789 sealing Methods 0.000 claims description 5
- 230000008602 contraction Effects 0.000 claims description 4
- 238000005553 drilling Methods 0.000 abstract description 28
- 239000012530 fluid Substances 0.000 abstract description 14
- 230000000694 effects Effects 0.000 abstract description 11
- 230000009467 reduction Effects 0.000 abstract description 7
- 230000005540 biological transmission Effects 0.000 abstract description 5
- 230000007246 mechanism Effects 0.000 description 11
- 230000008569 process Effects 0.000 description 7
- 230000000737 periodic effect Effects 0.000 description 6
- 230000010355 oscillation Effects 0.000 description 5
- 238000005299 abrasion Methods 0.000 description 2
- 230000009471 action Effects 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 230000003321 amplification Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000012937 correction Methods 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 239000003623 enhancer Substances 0.000 description 1
- 230000005284 excitation Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
- 230000003116 impacting effect Effects 0.000 description 1
- 238000010030 laminating Methods 0.000 description 1
- 238000003199 nucleic acid amplification method Methods 0.000 description 1
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- 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
- E21B7/00—Special methods or apparatus for drilling
- E21B7/24—Drilling using vibrating or oscillating means, e.g. out-of-balance masses
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- Apparatuses For Generation Of Mechanical Vibrations (AREA)
Abstract
The invention relates to a screw-excited hydraulic harmonic high-power reinforced vibrator, belonging to the technical field of underground tools for oil and gas exploitation. The vibrator comprises a vibrator body and a screw power nipple; the vibrator body consists of a vibrator shell, a screw rotor head, a fixed intercepting block and a resonance reinforcing part; a fixed interception block is arranged in the vibrator shell, and a resonance reinforcing part is arranged below the fixed interception block; a screw rotor head is arranged above the fixed intercepting block. This vibration can realize falling between drilling rod and the wall of a well and grind the drag reduction, accomplishes the high-pressure drilling fluid that strikes the screw rotor and gets into resonance reinforcement to form helmholtz effect and the high multiplication and enlarge the pulse effect of high-pressure drilling fluid by force, the axial pulse that produces from this arouses the pipe cluster wriggling, and double force is in coordination so that pressure transmission efficiency is higher, and it is better to alleviate the backing effect. The problem that the existing hydraulic oscillator is caused by the structure is solved; the problems of friction resistance and pressure between the drill rod and the well wall can not be thoroughly solved.
Description
Technical Field
The invention relates to a screw-excited hydraulic harmonic high-power reinforced vibrator, belonging to the technical field of underground tools for oil and gas exploitation.
Background
Along with the continuous increase of the drilling depth, the well depth structure is more complex, the number of long horizontal wells, large inclination wells, multi-branch horizontal wells and the like is increased, and the like, the problems are increasingly highlighted, the exploration and development of oil and gas resources in China enter the difficult-to-exploit era,
at present, the complex oil and gas wells are classified into unconventional oil and gas resources in engineering. Wherein, some unconventional wells are because the stratum lithology is fine and close, the drillability is poor, when using conventional drilling mode to bore a well, the drilling cycle is long, the complex situation that meets in the drilling process is many, because the reason that drilling rod and wall of a well laminating and drill chip returned inefficiency leads to having great friction between drilling rod and the wall of a well in the horizontal segment drilling process, the backing pressure phenomenon appears for the drilling pressure transmission efficiency reduces, horizontal drilling length and drilling rate reduce, arouse easily that to glue the emergence of complicated accident in the pit such as card. The drilling cost is also increased sharply, and the exploration and development speed and the cost of the oil field are directly influenced. In order to solve the problems, a hydraulic oscillator is usually additionally arranged on a tool pipe string, and the additionally arranged hydraulic oscillator can generate periodic pulse vibration which can well reduce friction resistance and improve drilling efficiency; however, due to the structural reasons of the existing hydraulic oscillator, the vibration power is deficient, and the problems of friction resistance and pressure between the drill rod and the well wall cannot be thoroughly solved, so that the improvement of the existing hydraulic oscillator is needed.
Disclosure of Invention
The invention aims to: the hydraulic harmonic high-power enhanced vibrator is characterized in that a screw is driven by liquid to excite harmonic waves, the harmonic waves are amplified, and high-power enhanced hydraulic pulses are generated, so that a tool has self-vibration capability, friction between a pipe column and a well hole is reduced, and the drill pressure transmission in the drilling process is improved.
The technical scheme of the invention is as follows:
a hydraulic harmonic high-power reinforced vibrator excited by a screw comprises a vibrator body and a screw power nipple; the screw power short section consists of a short section shell, a screw rotor and a screw stator which are arranged in the short section shell, and the vibrator body is in threaded connection with the power short section; the method is characterized in that: the vibrator body consists of a vibrator shell, a screw rotor head, a fixed intercepting block and a resonance reinforcing part; a fixed interception block is arranged in the stepped through hole of the vibrator shell in an interference manner, and a resonance reinforcing piece is fixedly arranged in the stepped through hole below the fixed interception block; a pulse cavity is arranged in the stepped through hole above the fixed closure block, a screw rotor head is arranged in the pulse cavity, one end of the screw rotor head is fixedly connected with the screw rotor, and the other end of the screw rotor head is connected with the fixed closure block in a sliding and sealing manner.
The screw rotor head is cylindrical, a converging cavity is arranged in the middle of the screw rotor head, and pulse nozzle flow channel holes are symmetrically formed in the screw rotor head below the converging cavity; the pulse nozzle flow passage hole is communicated with the confluence cavity, radial bypass holes are symmetrically arranged on the circumference of the screw rotor head corresponding to the confluence cavity, and the radial bypass holes are communicated with the confluence cavity.
The fixed cutoff block is a circular plate-shaped body, and the central part of the fixed cutoff block is provided with an overflowing hole corresponding to the flow passage hole of the pulse nozzle; the overflowing hole is intermittently communicated with the flow passage hole of the pulse nozzle.
The resonance reinforcement is cylindric, has set gradually on the resonance reinforcement from top to bottom and has gone up high multiplication by force cavity of resonance, well high multiplication by force cavity of resonance and the high multiplication by force cavity of resonance down.
The bottom of the upper resonance high multiplication strength cavity is provided with a middle resonance high multiplication strength cavity, and the upper resonance high multiplication strength cavity is communicated with the middle resonance high multiplication strength cavity through a communication hole; the diameter of the upper resonance high multiplication intensity cavity is larger than that of the middle resonance high multiplication intensity cavity.
The bottom of the middle resonance high multiplication strength cavity is provided with a lower resonance high multiplication strength cavity; the lower resonance high multiplication intensity cavity is communicated with the middle resonance high multiplication intensity cavity;
the lower resonance high multiplication strength chamber is composed of a left communication hole and a right communication hole which are arranged at intervals; the left communicating hole and the right communicating hole are communicated through cross holes arranged at intervals.
The bottoms of the left communicating hole and the right communicating hole are respectively provided with a contraction nozzle; the diameters of the left communicating hole and the right communicating hole are equal.
The invention has the beneficial effects that:
this hydraulic harmonic high power reinforcing vibrator of screw rod excitation simple structure is compact, be favorable to well head operation and transportation operation, the impact through high-pressure drilling fluid drives the screw rotor rotation in the working process, thereby it has radial mechanical vibration to produce, this vibration can realize the friction reduction drag reduction between drilling rod and the wall of a well, the high-pressure drilling fluid of accomplishing impact screw rotor gets into the resonance reinforcing part through the screw rotor head, because resonance reinforcing part is last from top to bottom set gradually the high multiplication of upper resonance cavity, well resonance high multiplication cavity and the high multiplication of lower resonance cavity, thereby form the pulse effect of helmholtz effect and high multiplication amplification high-pressure drilling fluid, the axial pulse that produces from this arouses the pipe cluster wriggling, the dual-force makes pressure transmission efficiency higher in coordination, it is better to alleviate the backing pressure effect. The problem of current hydraulic oscillator because structural reason leads to vibration power to lack to some extent, can not thoroughly solve the friction that exists between drilling rod and the wall of a well and hinder and the support pressure is solved.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic structural view of a lever power sub of the present invention;
FIG. 3 is a schematic structural view of a vibrator body according to the present invention;
FIG. 4 is a schematic structural view of a screw rotor head of the present invention;
fig. 5 is a schematic cross-sectional structure view of the resonance-reinforcing member of the present invention.
In the figure: 1. the vibrator comprises a vibrator body, 2, a screw power nipple, 3, a nipple shell, 4, a screw rotor, 5, a screw stator, 6, a vibrator shell, 7, a screw rotor head, 8, a fixed cutoff block, 9, a resonance reinforcing part, 10, an overflowing hole, 11, a pulse chamber, 12, a pulse nozzle flow channel hole, 13, a radial bypass hole, 14, an upper resonance high-multiplication strong chamber, 15, a middle resonance high-multiplication strong chamber, 16, a lower resonance high-multiplication strong chamber, 17, a communication hole, 18, a left communication hole, 19, a right communication hole, 20, a confluence cavity, 21 and a transverse hole; 22. and (4) contracting the nozzle.
Detailed Description
The hydraulic harmonic high-power reinforced vibrator excited by the screw comprises a vibrator body 1 and a screw power nipple 2; screw power nipple joint 2 comprises screw rotor 4 and screw stator 5 in nipple joint casing 3 and nipple joint casing 3, threaded connection each other between vibrator body 1 and the screw power nipple joint 2. The vibrator body 1 consists of a vibrator shell 6, a screw rotor head 7, a fixed cutoff block 8 and a resonance reinforcing part 9; a fixed interception block 8 is arranged in the stepped through hole of the vibrator shell 6 in an interference manner, the fixed interception block 8 is a circular plate-shaped body, and the center part of the fixed interception block 8 is provided with a flow passing hole 10 corresponding to a pulse nozzle flow channel hole 12.
A pulse cavity 11 is arranged in the stepped through hole above the fixed intercepting block 8, a screw rotor head 7 is arranged in the pulse cavity 11, the screw rotor head 7 is cylindrical, a converging cavity 20 is arranged in the middle of the screw rotor head 7, and pulse nozzle flow passage holes 12 are symmetrically arranged on the screw rotor head 7 below the converging cavity 20; the pulse nozzle flow passage hole 12 is communicated with a confluence cavity 20, radial bypass holes 13 are symmetrically arranged on the circumference of the screw rotor head 7 corresponding to the confluence cavity 20, and the radial bypass holes 13 are communicated with the confluence cavity; one end of the screw rotor head 7 is fixedly connected with the screw rotor 4, and the other end of the screw rotor head 7 is in sliding sealing contact with the fixed cutoff block 8; wherein the pulse nozzle flow channel orifice 12 is in intermittent communication with the overflow orifice 10.
A resonance reinforcing part 9 is fixedly arranged in the stepped through hole below the fixed cutoff block 8; the resonance reinforcement member 9 is cylindrical, and an upper resonance high multiplication strength chamber 14, a middle resonance high multiplication strength chamber 15 and a lower resonance high multiplication strength chamber 16 are sequentially arranged on the resonance reinforcement member 9 from top to bottom.
The bottom of the upper resonance high multiplication strength chamber 14 is provided with a middle resonance high multiplication strength chamber 15, and the upper resonance high multiplication strength chamber 14 is communicated with the middle resonance high multiplication strength chamber 15 through a communication hole 17; the diameter of the upper resonant high multiplication chamber 14 is larger than the diameter of the middle resonant high multiplication chamber 15.
A lower resonance high multiplication intensity cavity 16 is arranged at the bottom of the middle resonance high multiplication intensity cavity 15; the lower resonance high multiplication strength chamber 16 is composed of a left communication hole 18 and a right communication hole 19 which are arranged at intervals; the left communication hole 18 and the right communication hole 19 are communicated through transverse holes 21 arranged at intervals; the lower resonant high multiplication chamber 16 communicates with the middle resonant high multiplication chamber. The bottoms of the left communicating hole 18 and the right communicating hole 19 are respectively provided with a contraction nozzle 22; the left communication hole 18 and the right communication hole 19 are equal in diameter.
The hydraulic harmonic high-power reinforced vibrator excited by the screw rod can be divided into a power vibration mechanism, a pulse generation mechanism and a resonance high-power mechanism according to the functions of the vibrator.
The power vibration mechanism is composed of a screw power nipple 2, the screw rotor 4 is driven to rotate by the impact of high-pressure drilling fluid in the working process of the power vibration mechanism, so that radial mechanical vibration is generated, the vibration is transmitted outwards in the radial direction through the nipple shell 3, and the abrasion reduction and resistance reduction between a drill rod and a well wall can be realized.
The pulse generating mechanism consists of a screw rotor 4, a screw rotor head 7 and a fixed interception block 8; when the pulse generating mechanism works, the screw rotor head 7 rotates circumferentially under the action of the screw rotor 4, and the pulse nozzle flow passage hole 12 and the overflowing hole 10 form periodic intermittent communication in the rotation of the screw rotor head 7, so that the overflowing area between the pulse nozzle flow passage hole (port) 12 and the overflowing hole 10 forms periodic large and small changes, axial pulses are generated, and the axial pulses enter the resonance reinforcing piece 9.
The resonance high multiplication mechanism is composed of a resonance reinforcing part 9, axial pulses generated by the pulse generating mechanism enter the resonance reinforcing part 9 to be amplified by high multiplication, then go down through the resonance nozzle 19 and act on the drill bit, and therefore axial impact vibration is formed on the drill bit, and the problems of friction resistance and pressure supporting existing between the drill bit and the well wall are thoroughly solved. The working principle is as follows:
the harmonic high-power enhancement principle is that fluid is excited by self-excitation pressure generated by the outlet contraction section of the resonant cavity and is fed back to the resonant cavity to form pressure feedback oscillation, and the resonance high-power enhancement mechanism can enable the feedback pressure oscillation frequency to be equal to the natural frequency of the resonant cavity to form resonance to generate cavitation.
The best theoretical formula for the resonance nozzle diameter of the resonance enhancer 9 of the invention:
in the formula: d-nozzle diameter;
q-jet flow rate, L/min;
p-jet pressure, Mpa;
n-the number of nozzles;
b-nozzle correction coefficient, generally taking the value of 0.1-0.3.
The inlet cavity diameter of the resonance reinforcing piece 9 is D1, the diameter of the resonant cavity (left and right communicating holes) is D2, the length of the resonant cavity is L, and the diameter of the resonant nozzle is D, and the length of the resonant nozzle is L1.
The natural frequency f of the resonator is determined by:
in the formula: a-the disturbance wave velocity of the resonant cavity;
l-length of the cavity;
KN-a modulus coefficient;
in the formula: n-the oscillation modulus within the resonant cavity, N =1,2,3.. the number of oscillations in the resonant cavity is N = 1;
c-is a constant value, determined by experiment;
in the formula: -critical strouhal number;
in the formula: d-the diameter of the resonant nozzle, m;
v-jet velocity of resonance nozzle, m/s;
at that time, the strongest resonance will occur within the resonance enhancement:
when the hydraulic harmonic high-power enhancement vibrator excited by the screw works, high-pressure drilling fluid entering the screw power nipple 2 impacts the screw rotor 4 and drives the screw rotor 4 to rotate under the impact action of the high-pressure drilling fluid, so that the screw rotor head 7 is driven to rotate, radial mechanical vibration can be generated in the rotating process of the screw rotor 4 and the screw rotor head 7, the vibration is transmitted outwards in the radial direction through the nipple shell 3, and the abrasion reduction and resistance reduction between a drill rod and a well wall can be realized; as an improvement, the screw rotor 4 and the screw rotor head 7 may be eccentrically connected to increase the centrifugal force of the screw rotor head 7 and further increase the radial mechanical vibration force when the screw rotor 4 rotates. When the screw rotor 4 and the screw rotor head 7 are eccentrically connected, the structures of the pulse nozzle flow passage hole 12 and the overflowing hole 10 need to be adjusted to ensure that the pulse nozzle flow passage hole 12 and the overflowing hole 10 can be intermittently communicated.
The high-pressure drilling fluid impacting the screw rotor 4 continuously moves downwards and enters the pulse chamber 11 of the vibrator body 1, the fixed interception block 8 forms sealing plugging on the bottom of the pulse chamber 11, and the screw rotor head 7 is in sliding sealing contact with the fixed interception block 8. After the high-pressure drilling fluid entering the pulse chamber 11 is converged to a certain amount, the high-pressure drilling fluid enters the screw rotor head 7 through the radial bypass holes 13 and is then ejected out through the pulse nozzle flow passage holes 12; in the process, due to the rotation of the screw rotor head 7, a periodic matching dislocation is formed between the pulse nozzle flow passage hole 12 and the overflowing hole 10 of the fixed intercepting block 8, the overflowing hole 10 on the fixed intercepting block 8 is opened for 2 times every time the screw rotor head 7 rotates for one circle, and the periodic opening and closing forms a pulse impact, so that the overflowing area between the pulse nozzle flow passage hole (opening) 12 and the overflowing hole 10 forms a periodic large and small change, and an axial pulse is generated and enters the resonance reinforcing part 9.
Because the resonance reinforcement part 9 is sequentially provided with three chambers which are not equal in diameter, namely an upper resonance high-multiplication-strength chamber 14, a middle resonance high-multiplication-strength chamber 15 and a lower resonance high-multiplication-strength chamber 16 from top to bottom, the pulse fluid entering the resonance reinforcement part 9 generates feedback pressure oscillation due to the Helmholtz effect, when the pressure fluctuation frequencies of the upper resonance high-multiplication-strength chamber 14, the middle resonance high-multiplication-strength chamber 15 and the lower resonance high-multiplication-strength chamber 16 are consistent, the liquid in each chamber generates sound resonance to generate self-vibration cavitation effect, and strong cavitation jet is formed to enable the hydraulic harmonic to be reinforced in high power; namely, the Helmholtz effect is formed, the pulse effect of the high-pressure drilling fluid is amplified by high multiplication intensity, the generated axial pulse causes the tube string to creep, and the vibration force of the power vibration mechanism is matched; the double-force cooperation enables the pressure transmission efficiency to be higher, and the pressure relieving effect to be better. Therefore, the problems that the existing hydraulic oscillator is lack of vibration power due to structural reasons and cannot thoroughly solve the problems of friction resistance and pressure supporting existing between a drill rod and a well wall are solved.
Claims (9)
1. A hydraulic harmonic high-power reinforced vibrator excited by a screw comprises a vibrator body (1) and a screw power nipple (2); the screw power short section (2) is composed of a short section shell (3), a screw rotor (4) and a screw stator (5) which are arranged in the short section shell (3), and the vibrator body (1) is in threaded connection with the power short section (2); the method is characterized in that: the vibrator body (1) is composed of a vibrator shell (6), a screw rotor head (7), a fixed cutoff block (8) and a resonance reinforcing part (9); a fixed interception block (8) is arranged in a stepped through hole of the vibrator shell (6) in an interference fit manner, and a resonance reinforcing part (9) is fixedly arranged in the stepped through hole below the fixed interception block (8); a pulse chamber (11) is arranged in the stepped through hole above the fixed interception block (8), a screw rotor head (7) is arranged in the pulse chamber (11), one end of the screw rotor head (7) is fixedly connected with the screw rotor (4), and the other end of the screw rotor head (7) is connected with the fixed interception block (8) in a sliding and sealing manner.
2. The screw-excited hydraulic harmonic high-power enhancement vibrator according to claim 1, characterized in that: the screw rotor head (7) is cylindrical, a converging cavity (20) is arranged in the middle of the screw rotor head (7), and pulse nozzle flow channel holes (12) are symmetrically formed in the screw rotor head (7) below the converging cavity (20); the pulse nozzle flow passage hole (12) is communicated with the confluence cavity (20).
3. The screw-excited hydraulic harmonic high-power enhancement vibrator according to claim 2, characterized in that: radial bypass holes (13) are symmetrically formed in the circumference of the screw rotor head (7) corresponding to the confluence cavity (20), and the radial bypass holes (13) are communicated with the confluence cavity (20).
4. The screw-excited hydraulic harmonic high-power enhancement vibrator according to claim 1, characterized in that: the fixed cutoff block (8) is a circular plate-shaped body, and the central part of the fixed cutoff block (8) is provided with an overflowing hole (10) corresponding to the pulse nozzle flow passage hole (12); the overflowing hole (10) is intermittently communicated with the pulse nozzle flow passage hole (12).
5. The screw-excited hydraulic harmonic high-power enhancement vibrator according to claim 1, characterized in that: resonance reinforcement (9) be cylindricly, resonance reinforcement (9) are gone up and are set gradually resonance high multiplication intensity cavity (14), well resonance high multiplication intensity cavity (15) and resonance high multiplication intensity cavity (16) down.
6. The screw-excited hydraulic harmonic high-power enhancement vibrator according to claim 5, wherein: the bottom of the upper resonance high multiplication strength chamber (14) is provided with a middle resonance high multiplication strength chamber (15), and the upper resonance high multiplication strength chamber (14) is communicated with the middle resonance high multiplication strength chamber (15) through a communicating hole (17); the diameter of the upper resonance high multiplication intensity cavity (14) is larger than that of the middle resonance high multiplication intensity cavity (15).
7. The screw-excited hydraulic harmonic high-power enhancement vibrator according to claim 6, wherein: a lower resonance high multiplication intensity chamber (16) is arranged at the bottom of the middle resonance high multiplication intensity chamber (15); the lower resonance high multiplication intensity chamber (16) is communicated with the middle resonance high multiplication intensity chamber (15).
8. The screw-excited hydraulic harmonic high-power enhancement vibrator according to claim 7, wherein: the lower resonance high multiplication strength chamber (16) is composed of a left communication hole (18) and a right communication hole (19) which are arranged at intervals; the left communication hole (18) and the right communication hole (19) are communicated through transverse holes (21) arranged at intervals.
9. The screw-excited hydraulic harmonic high-power enhancement vibrator according to claim 8, wherein: the bottoms of the left communicating hole (18) and the right communicating hole (19) are respectively provided with a contraction nozzle (22); the diameters of the left communication hole (18) and the right communication hole (19) are equal.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010281565.7A CN111395967A (en) | 2020-04-10 | 2020-04-10 | Hydraulic harmonic high-power reinforced vibrator excited by screw |
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| CN202010281565.7A CN111395967A (en) | 2020-04-10 | 2020-04-10 | Hydraulic harmonic high-power reinforced vibrator excited by screw |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111854655A (en) * | 2020-07-22 | 2020-10-30 | 上海交通大学 | Non-contact ultrasonic thickness measuring system and method suitable for numerical control lathe |
| CN114482862A (en) * | 2020-10-23 | 2022-05-13 | 中国石油化工股份有限公司 | Multidimensional vibration hydraulic oscillator |
| CN115788278A (en) * | 2022-12-06 | 2023-03-14 | 四川达坦能源科技有限公司 | Screw type pulse anti-drag drilling tool |
-
2020
- 2020-04-10 CN CN202010281565.7A patent/CN111395967A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111854655A (en) * | 2020-07-22 | 2020-10-30 | 上海交通大学 | Non-contact ultrasonic thickness measuring system and method suitable for numerical control lathe |
| CN114482862A (en) * | 2020-10-23 | 2022-05-13 | 中国石油化工股份有限公司 | Multidimensional vibration hydraulic oscillator |
| CN115788278A (en) * | 2022-12-06 | 2023-03-14 | 四川达坦能源科技有限公司 | Screw type pulse anti-drag drilling tool |
| CN115788278B (en) * | 2022-12-06 | 2023-10-17 | 四川达坦能源科技有限公司 | Screw pulse drag reduction drilling tool |
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