CN105822249A - Magnetic pressurizing polished rod sealing device - Google Patents
Magnetic pressurizing polished rod sealing device Download PDFInfo
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- CN105822249A CN105822249A CN201610372660.1A CN201610372660A CN105822249A CN 105822249 A CN105822249 A CN 105822249A CN 201610372660 A CN201610372660 A CN 201610372660A CN 105822249 A CN105822249 A CN 105822249A
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- magnetic fluid
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- 238000007789 sealing Methods 0.000 title claims abstract description 62
- 238000004519 manufacturing process Methods 0.000 claims abstract description 33
- 239000011553 magnetic fluid Substances 0.000 claims abstract description 31
- 239000007788 liquid Substances 0.000 claims abstract description 5
- 238000005381 potential energy Methods 0.000 claims abstract description 5
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 7
- 238000005086 pumping Methods 0.000 abstract description 5
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- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 description 1
- 206010017389 Frotteurism Diseases 0.000 description 1
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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
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/02—Surface sealing or packing
- E21B33/03—Well heads; Setting-up thereof
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16J—PISTONS; CYLINDERS; SEALINGS
- F16J15/00—Sealings
- F16J15/16—Sealings between relatively-moving surfaces
- F16J15/40—Sealings between relatively-moving surfaces by means of fluid
- F16J15/43—Sealings between relatively-moving surfaces by means of fluid kept in sealing position by magnetic force
Abstract
A magnetic pressurizing polished rod sealing device is used for sealing a wellhead polished rod of a beam-pumping unit in an oil field and solves the long-standing, big and difficult problems that for more than one hundred years, various polished rod sealing devices are high in frictional resistance and are often leaked to pollute the environment. The magnetic pressurizing polished rod sealing device is characterized in that the lower end inside a cylindrical polished rod sealing box is provided with a fixed sealing sleeve into which six strip-shaped permanent magnets are embedded, the upper end inside the cylindrical polished rod sealing box is provided with a sliding sealing sleeve into which six strip-shaped permanent magnets are embedded, magnetic fluid packing is fully filled between the upper sealing sleeve and the lower sealing sleeve, the sliding sealing sleeve always keeps the potential energy of sliding towards the fixed sealing sleeve under the gravitation action of a high-intensity magnetic field generated by the twelve heterospolar relative permanent magnets, and therefore the magnetic fluid packing is firmly adsorbed and pressed to form an extensible high-pressure sealing area. Through liquid high-lubricating packing sealing, the polished rod can be enduringly and well sealed, energy conservation and emission reduction are achieved, oil, gas and water leakage is eliminated, the work of replacing packing with a new one is avoided, the suspend production losses are reduced, potential safety hazards are eliminated, the environmental protection quality is improved, and green oil field development is assisted.
Description
One, technical field:
(1), the technical field of the invention:
Patent records technical field: machinery and technical field of transportation mechanical component G05G are only by control device or the system of mechanical features differentiation.
Department of Science and Technology's high-technology field catalogue: eight, new and high technology is rebuild traditional industry (four) novel mechanical 2, universal machine and novel mechanical.
(2), range of application:
The present invention is petroleum industry energy-saving and emission-reduction, safety and environmental protection new technique, is the upgraded product of the packing polished rod sealer that current oil field commonly uses, it is adaptable to about 500,000 mouthfuls of the whole nation and the polished rod seal of the about 5,000,000 mouthfuls of Dlagnosis of Sucker Rod Pumping Wells in the whole world.
(3), function:
The present invention uses magnetic supercharging technology and magnetic fluid compound seal technique, in axially making sealed letter, magnetic fluid filler remains supercharging situation, it is allowed to be formed radially countless " O " shape magnetic fluid sealing ring, automatically, issuable any gap in seal area is filled densely, strengthen breakdown characteristics, thus it is leakage sealed to realize polished rod " zero "；The present invention solves packing and " holds " that to seal the frictional resistance that causes big tightly, oil pumper power consumption is big, and packing damages to be changed frequently, and stop production to overhaul cost is high, wellheadpressure oil gas water is frequent " run, drip, leak ", and a series of hard nut to cracks such as consequent Heavy environmental pollution and potential safety hazard.
Two, background technology:
The pumping unit rod sealing device patent of at present State Patent Office's certification reaches 200 multinomial, but approved by oil field and have practical value very little, this explanation solves the crowd of polished rod seal leakage problem researcher, and difficulty is big.Reality is, what the polished rod sealer commonly used in oil field was still continued to use is the basic structure over more than 100 year, here it is packing box polished rod sealer, is also the unique class type being loaded into " petroleum production engineering handbook ".
1, kind: current each oil field widely used tradition polish rod sealing mainly has: single packing box polished rod sealer, double-packing box polished rod sealer, single column shape packing box polished rod sealer, double tower shape packing box polished rod sealer, spherical packing box polished rod sealer etc..
2, basic structure
Tradition packing box class polish rod seal device, most typically " O " shape rubber ring list packing box polished rod sealer, as shown in Figure 2；Double tower shape packing box polished rod sealer, as shown in Figure 3.
The structure of this series products mainly comprises the following steps: 12, upper press cover；13, leather orchid；14, " O " type rubber seal (or braiding packing sealing ring)；15, packing box (sealed letter)；16, spring；17, packing box and production tree box cupling；18, turriform rubber seal.
Other types product, such as packing box polished rod sealers such as double-packing box, single column type packing box, spherical packing boxs, is by type slight changes substantially sealed off, and remaining structure is essentially identical.
3, know-why
As shown in Figure 2 and Figure 3, by screwing upper press cover 12, promote leather blue 13, compress " O " shape packing 14 or 18, be allowed to produce deformation and hold polished rod tightly, thus play sealing function, prevent the band force feed in oil well, gas and water from emerging with the reciprocating motion of polished rod well head.
Other each kind product technology principles are the most basically identical, are all to produce deformation by machinery compressing packing " to hold " polished rod mode tightly, play sealing function.
This series products has continued to use century more than one, in practice it has proved that it can play certain sealing function at the use initial stage, but existing problems are a lot, it is impossible to adapts to oil field modernization construction needs, is badly in need of updating.
4, existing problems:
As shown in Figure 2 and Figure 3, use mechanical compaction rubber packing deformation to implement " holding tightly " and seal moving back and forth polished rod, be primarily present problems with:
(1), Heavy environmental pollution is caused.
" hold " sealing tightly and necessarily cause rubber packing (or braiding packing) abrasion, first from abrasion, slot leakage goes out is oil field gas, according to United Nations Environment Programme (UNEP) official website announce, the whole world oil-producing, gas well every year to atmosphere discharge natural gas, oil field gas about 13600000000m3.Natural gas, oil field gas main component are CH4(also there is a certain amount of SH2), it releases emission capacity far above CO2, belong to high carbon emission, be depletion of the ozone layer, greenhouse effect expansion and the important root causing acid rain.In oil field, poisonous, harmful gas the most invisible, impalpable has discharge every day.After packing may wear to a certain degree, crude oil and high salinity subsoil water will leak ground, cause ground surface environment severe contamination；If oil well is in farmland, will result in crops the most dead.
(2), labor strength is big.
In order to make packing box not leak, oil recovery workman must make an inspection tour well site every day, tightens packing gland；The service life of packing is the longest, within every 1～2 week, must stop production, take upper press cover apart, change new packing；Especially Desert Oilfields, conducts a field operation under the adverse circumstances of 20～30 degree under 40～50 degree above freezing of summer, zero in winter, the arduousest.
(3), potential safety hazard.
The gas overflowed from packing box is natural gas, and its main component is CH4, C2H6, C3H8 etc.；Also contain more or less H2S according to different geological conditions, the former is inflammable and explosive, and the latter can burn respiratory system, cause people's death by suffocation.Therefore saying, packing leakage is the potential safety hazard that oil field is serious.
(4), energy consumption is increased.
During pumping production, either upstroke or down stroke, polished rod all in " being held " even tightly the braking state of " locking " by packing, adds the resistance of motion, also increases oil pumper energy consumption all the time.
(5), waste resource.
Rubber packing (or braiding packing) is by after abrasion, and produces gap between polished rod, and along with using time lengthening, this gap constantly expands, and the band force feed in oil well, gas and water are constantly emerged from gap, overflowing dissipates, and wastes precious resources.
(6), polished rod is damaged.
All the time be in mechanical pressure and hold Frotteurism tightly due to polished rod, frictional dissipation makes polished rod from the coarse to fine, and fatigue stress makes to crack inside polished rod, and dual function is greatly shortened polished rod service life.
(7), easily cause sucker rod partially to rub.
All the time rigidity oppression state it is in due to polished rod, when its motion departs from oil well axis, following sucker rod will be driven (short then seven, 800 meters, long then two, three kms) also offset from oil well axis and present " snakelike " motion, cause sucker rod partially to rub, thus increase oil pumper power consumption, and easily rub rod collar, there is disconnected bar accident, make oil well be forced to stop production maintenance.
(8), production suspension induced losses is big.
As it has been described above, use packing box polished rod sealer, cause and often change packing, change polished rod, the operations such as sucker rod rubs partially, disconnected bar, well workover, have a strong impact on oil field and normally produce.According to incompletely statistics, the whole nation is caused every year due to polished rod stuffing box sealing leak problem energy consumption, material consumption, production suspension induced losses, operating cost etc. not under hundreds of hundred million yuan.
Three, summary of the invention:
(1), goal of the invention
High in order to eliminate packing box polish rod seal device energy consumption, damage fast, pollute big, have a strong impact on the problems such as production and benefit, rebuild traditional industry with new technique, I Deng Haibo declared magnetic fluid polished rod sealer ZL200820065400.0 patent in 2008；Within 2014, upgraded, it is thus achieved that outside universal random correction, note magnetic fluid polished rod sealer ZL201420073652.3 patent；Perfect through nearly 10 years experimentatioies and constant improvement, on the basis of front 2 patents, the magnetic supercharging polished rod sealer of upgrading has realized more than 1 year not stopping production, does not reloads, do not operate, do not safeguard, do not leak, currently Duo Jia oil field is promoted, and plays a role for building green oilfield.
(2), theoretical principle of the present invention
According to modern quantum-mechanical theory, material produces magnetic field due to the microcosmic reciprocal action of electron spin magnetic moments, orbital magnetic moment and nuclear moments；Magnetic field is the objective form of one that material exists；Magnetic field has energy and momentum；Magnet has homopolar-repulsion, the attracting characteristic of heteropole, its essence is the Orienting ordered arrangement of internal magnetic domain.Massachusetts Institute Technology R.C.Ohandley professor proves through long-term experiment research, and (granularity is 10 for single magnetic domain or many magnetic domains soft magnetic property liquid-7～10-9M), magnetize under strong magnetic field action, polarity orientation ordered arrangement can be formed at three dimensions, and its mathematical description defers to the fundamental equations such as Maxwell, Biot-Savart, Bernoulli.
(3), concrete scheme of the present invention and innovation point
1, overall structure innovation.Magnetic supercharging polished rod sealer, it is characterized in that: in cylindric polished rod seal letter, lower end is installed and is embedded 6 pieces of strip permanent magnet fixing seal sets, upper end is installed and is embedded 6 pieces of strip permanent magnet slipper seal sets, magnetic fluid filler is filled between upper and lower sealing shroud, 12 pieces of different levels relative under production of intense permanent magnet field graviational interaction, slipper seal set remains the potential energy to fixing seal set sliding, thus firmly adsorb and oppress magnetic fluid filler and form telescopic high pressure sealing district, this liquid lubricates by force filling sealing can seal up polished rod the most well.
2, invention fixing seal covering device.Described fixing seal set, its matrix is the PTFE annulus having driven 6 dovetail grooves along radial direction, dovetail groove embeds 6 pieces of strip permanent magnets that polarity is the most contrary, under production of intense permanent magnet field graviational interaction, firmly absorption magnetic fluid forms countless " O " shape sealing ring, all gaps between flexible closure PTFE annulus inner edge and polished rod, thus play lasting excellent sealing effect, it is fixing that PTFE annulus outer rim has screw thread to be connected with sealed letter inwall.
3, invention slipper seal covering device, makes seal area automatic telescopic and keeps high pressure not subtract.nullDescribed slipper seal set，Its matrix is the PTFE annulus having driven 6 dovetail grooves along radial direction，Dovetail groove embeds 6 pieces of strip permanent magnets that polarity is the most contrary，Under production of intense permanent magnet field graviational interaction，Firmly absorption magnetic fluid forms countless " O " shape sealing ring，All gaps between flexible closure PTFE annulus inner edge and polished rod，Thus play lasting excellent sealing effect，PTFE annulus outer rim is provided with piston type " OD " sealing ring simultaneously，Upper、Lower 12 pieces of different levels are relative under production of intense permanent magnet field graviational interaction，Slipper seal set remains the potential energy to fixing seal set sliding，Thus firmly adsorb and oppress magnetic fluid filler and form telescopic high pressure sealing district，After the loss of magnetic fluid filler is run off，High pressure sealing district shrinks automatically，After outside magnetic fluid filler, note supplements，The supercharging of high pressure sealing district is expanded to maximum，This sealer remains that internal pressure and resistance to breakdown capability do not weaken.
(4), the present invention also has the advance of my multinomial invention in the past
1, magnetic supercharging polished rod sealer has magnet fluid sealing characteristic simultaneously.Magnetic fluid filler is injected in sealed letter by outer orifice, in fixing seal set and slipper seal overlap under high-intensity magnetic field power effect produced by multiple permanent magnets, magnetic fluid is along flux loop dense distribution, all the time adsorbed " control " in suspended state, these " magnetic suspension bodies " are automatically filled in all gaps between polished rod and sealing shroud, sealing shroud and letter inwall, play the best sealing function.
2, magnetic supercharging polished rod sealer has universal random correction characteristic simultaneously.The black box of aforementioned high pressure sealing district automatically retractable combines on cating nipple, and universal joint be arranged on axially can shake the head 15 °, radially can realize random correction at three dimensions and random time node in the double-deck boxes set of 360 ° of translations.
3, magnetic supercharging polished rod sealer has the random supplementary magnetic fluid characteristic of outer note simultaneously.In polished rod seal letter, magnetic fluid filler is moved back and forth polished rod and takes out of and evaporate and wear off minimizing is inevitable phenomenon, for solving this problem, 1 injection valve respectively it is mounted with in polished rod seal letter upper and lower, the available glue rifle random outer note that the most do not stops production supplements magnetic fluid filler, thus is greatly prolonged sealer service life.
(5), primary efficacy
(1), good sealing effect, service life is long.
Magnetic supercharging polished rod sealer, due to by polished rod by original packing solid rigidity hold tightly sealing changed into liquid by force lubricate filling seal, oil, water can not only be sealed, it is often more important that in well, natural gas with pressure also can effectively seal, its sealing effectiveness is that packing box seals and cannot compare, this technical products can not stop production, and does not reloads, and does not operates, do not safeguard, do not leak continuously safe handling 2 to 3 years, after can continue to reuse through minor service, the life-span is more than 5 years.
(2), energy-saving and cost-reducing.
Tradition packing box polished rod sealer is the biggest to polished rod reciprocal movement friction resistance；And magnetic supercharging polished rod sealer is to form countless liquid " O " shape sealing ring by high-intensity magnetic field graviational interaction absorption magnetic fluid around polished rod, fill and seal position realization sealing, and containing strong lubricant and anti-wear agent in magnetic fluid, coefficient of friction between it and polished rod is practically negligible, therefore frictional dissipation merit is greatly reduced, thus reduce oil pumper power consumption, reduce cost for oil production.
(3) environmental benefit is good.
Magnetic supercharging polished rod sealer, owing to having stopped band force feed in oil well, gas and water " run, drip, leak ", particularly eliminates CH4、C2H6Discharge Deng high-carbon gas, it is to avoid to air and the pollution on ground, improve again the utilization rate of resource simultaneously, for building " green ecological oil field ", stay the next green earth to make contributions to descendants.
(4), safety is guaranteed.
After tradition packing box polished rod sealer abrasion, first leak is natural gas and oil field gas, at least diffusion pollution air, the most inflammable, explosive, causes security incident；If especially in bubbing, H2S content is high, with regard to the personal safety of entail dangers to scene worker；And magnetic supercharging polished rod sealer " O " leakage, can effectively eliminate safe hidden trouble.
(5), save manually.
Magnetic supercharging polished rod sealer, oil recovery workman can be exempted and must screw the work of gland for packing box every day, it is to avoid the production suspension induced losses that regular replacing packing causes, reduce polished rod and sucker rod failure and the workover treatment thereby resulted in, thus save a large amount of artificial and material consumption, reduce cost for oil production.
(6), productivity ratio and economic benefit are improved.
Tradition packing box polished rod sealer uses " holding tightly " polished rod seal mechanism, this mechanism be cause polished rod to rub, one of the major reason of production accident such as sucker rod suppresses bent eccentric wear, sucker rod rubs, pumping rod disengaging.Once there is this kind of accident, must stop production to overhaul, add the aqueous convalescent period opened after taking out, oil-producing loses at least six, seven days, many up to one, 20 days；Meanwhile, daily replacing packing and packing box also must stop production, and this regular production suspension induced losses cannot be added up especially.Magnetic supercharging polished rod sealer, it is achieved do not stop production, do not reload, do not operate, do not safeguard, do not leak for about 2 years, can greatly reduce the above-mentioned off-time, improves oil pumper useful efficiency and oilfield economic benefit.
(6), important technological parameters
1, overall dimensions: ∮ 88.9 × 450mm
2, net weight: 30kg
3, size for connection: 27/8TBG
4, tensile strength: >=600MPa
5, temperature is used :-40～+120 DEG C
6, seal pressure: >=10MPa
7, the polished rod degree of eccentricity is radially adjusted: ⊙ 12mm；
8, the axially adjustable polished rod degree of eccentricity: ∠ 15 °
Four, accompanying drawing explanation:
Fig. 1 is magnetic supercharging polished rod sealer overall structure schematic diagram
Fig. 2 is single packing box polished rod sealer overall structure schematic diagram
Fig. 3 is double tower shape packing box polished rod sealer overall structure schematic diagram
Fig. 4 is that permanent magnet sealing shroud, magnetic loop and magnetic fluid fill seal area schematic diagram
Fig. 5 is magnetic supercharging principle schematic in seal area
Fig. 6 is scalable high pressure sealing plot structure schematic diagram
Sequentially in above-mentioned Fig. 1～6 respectively number: 1 polished rod；2, gland；3, leather orchid；4, permanent magnet；5, sealed letter；6, injection valve outside sealed letter bottom；7, PTFE box set；8, auxiliary is sealed；9, universal joint and random deviation correcting device；10, production tree box cupling；11, sealed letter top injecting valve opening；12, packing box upper press cover；13, leather orchid in packing box；14, packing；15, packing box；16, spring；17, production tree box cupling；18, turriform rubber seal；19, the magnetic line of force；20, strip permanent magnet；21, magnetic fluid filler；22, upper slidable PTFE box set；23, permanent magnet；24, piston type " OD " sealing ring；25, PTFE box set is fixed in bottom.
Five, detailed description of the invention:
See Figure of description 1～6.Magnetic supercharging polished rod sealer of the present invention, top is each sealing shroud and outer note valve module in polished rod seal letter, letter；Bottom is universal random deviation correcting device assembly；Use segmental machining to manufacture then abutting joint and become the process route of complete machine.Magnetic fluid filler is produced by my special formulation.
Sealed letter 5 and upper press cover 2 use 30CrMn to manufacture, and petroleum industry standard thread connects；Fixing seal set 25 and slipper seal set 22 employing PTFE material processing, processing of entrusting outside the strip permanent magnet 20 and 23 entered in every layer of box set, " OD " sealing ring and other sealing auxiliary outsourcings, be then assembled into whole parts.
Universal random deviation correcting assembly 9 uses 45 steel makings, internal each screw thread that connects to use national standard processing, and fluorine rubber seal element is pressed standard outsourcing, then assembled.
Universal with bottom for top seal letter assembly random deviation correction mechanism screw thread is docked and is magnetic supercharging polished rod sealer.
Claims (3)
1. magnetic supercharging polished rod sealer, it is characterized in that: in cylindric polished rod seal letter, lower end is installed and is embedded 6 pieces of strip permanent magnet fixing seal sets, upper end is installed and is embedded 6 pieces of strip permanent magnet slipper seal sets, magnetic fluid filler is filled between upper and lower sealing shroud, 12 pieces of different levels relative under production of intense permanent magnet field graviational interaction, slipper seal set remains the potential energy to fixing seal set sliding, thus firmly adsorb and oppress magnetic fluid filler and form telescopic high pressure sealing district, this liquid lubricates by force filling sealing can seal up polished rod the most well.
Magnetic supercharging polished rod sealer the most according to claim 1, it is characterized in that: described fixing seal set, its matrix is the PTFE annulus having driven 6 dovetail grooves along radial direction, dovetail groove embeds 6 pieces of strip permanent magnets that polarity is the most contrary, under production of intense permanent magnet field graviational interaction, firmly absorption magnetic fluid forms countless " O " shape sealing ring, all gaps between flexible closure PTFE annulus inner edge and polished rod, thus playing lasting excellent sealing effect, it is fixing that PTFE annulus outer rim has screw thread to be connected with sealed letter inwall.
nullMagnetic supercharging polished rod sealer the most according to claim 1，It is characterized in that: described slipper seal set，Its matrix is the PTFE annulus having driven 6 dovetail grooves along radial direction，Dovetail groove embeds 6 pieces of strip permanent magnets that polarity is the most contrary，Under production of intense permanent magnet field graviational interaction，Firmly absorption magnetic fluid forms countless " O " shape sealing ring，All gaps between flexible closure PTFE annulus inner edge and polished rod，Thus play lasting excellent sealing effect，PTFE annulus outer rim is provided with piston type " OD " sealing ring simultaneously，Upper、Lower 12 pieces of different levels are relative under production of intense permanent magnet field graviational interaction，Slipper seal set remains the potential energy to fixing seal set sliding，Thus firmly adsorb and oppress magnetic fluid filler and form telescopic high pressure sealing district，After the loss of magnetic fluid filler is run off，High pressure sealing district shrinks automatically，After outside magnetic fluid filler, note supplements，The supercharging of high pressure sealing district is expanded to maximum，This sealer remains that internal pressure and resistance to breakdown capability do not weaken.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610372660.1A CN105822249A (en) | 2016-05-30 | 2016-05-30 | Magnetic pressurizing polished rod sealing device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610372660.1A CN105822249A (en) | 2016-05-30 | 2016-05-30 | Magnetic pressurizing polished rod sealing device |
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| CN105822249A true CN105822249A (en) | 2016-08-03 |
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| CN201610372660.1A Pending CN105822249A (en) | 2016-05-30 | 2016-05-30 | Magnetic pressurizing polished rod sealing device |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107503719A (en) * | 2017-09-29 | 2017-12-22 | 谢云琼 | A kind of nonpetroleum exploitation oil well pump |
| CN108181442A (en) * | 2017-12-20 | 2018-06-19 | 中国石油天然气集团公司 | A kind of coal seam gas production well packing CH_4 detection real-time sampling device and its application |
| CN108825787A (en) * | 2018-06-28 | 2018-11-16 | 刘磊 | A kind of OD type sealing ring |
| CN111075929A (en) * | 2019-11-27 | 2020-04-28 | 维沃移动通信有限公司 | Telescopic assembly and electronic equipment |
| CN112593891A (en) * | 2020-12-28 | 2021-04-02 | 雅安万利橡塑密封技术有限责任公司 | Blowout prevention box rubber core sealing assembly |
| CN113216888A (en) * | 2021-05-13 | 2021-08-06 | 烟台大学 | Novel magnetic sealing structure device for polished rod |
| CN113984878A (en) * | 2021-11-02 | 2022-01-28 | 国家电网有限公司 | Overhead cable insulating layer damage detection equipment |
| CN114059952A (en) * | 2021-10-26 | 2022-02-18 | 桂林航天工业学院 | Spherical polish rod sealing device |
| US11592018B2 (en) | 2020-05-22 | 2023-02-28 | Saudi Arabian Oil Company | Surface driven downhole pump system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107503719A (en) * | 2017-09-29 | 2017-12-22 | 谢云琼 | A kind of nonpetroleum exploitation oil well pump |
| CN108181442A (en) * | 2017-12-20 | 2018-06-19 | 中国石油天然气集团公司 | A kind of coal seam gas production well packing CH_4 detection real-time sampling device and its application |
| CN108825787A (en) * | 2018-06-28 | 2018-11-16 | 刘磊 | A kind of OD type sealing ring |
| CN111075929A (en) * | 2019-11-27 | 2020-04-28 | 维沃移动通信有限公司 | Telescopic assembly and electronic equipment |
| US11592018B2 (en) | 2020-05-22 | 2023-02-28 | Saudi Arabian Oil Company | Surface driven downhole pump system |
| CN112593891A (en) * | 2020-12-28 | 2021-04-02 | 雅安万利橡塑密封技术有限责任公司 | Blowout prevention box rubber core sealing assembly |
| CN112593891B (en) * | 2020-12-28 | 2022-05-31 | 雅安万利橡塑密封技术有限责任公司 | Blowout prevention box rubber core sealing assembly |
| CN113216888A (en) * | 2021-05-13 | 2021-08-06 | 烟台大学 | Novel magnetic sealing structure device for polished rod |
| CN114059952A (en) * | 2021-10-26 | 2022-02-18 | 桂林航天工业学院 | Spherical polish rod sealing device |
| CN113984878A (en) * | 2021-11-02 | 2022-01-28 | 国家电网有限公司 | Overhead cable insulating layer damage detection equipment |
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