CN106917620A - A kind of simulating test device and analog detection method of cement sheath microannulus - Google Patents
A kind of simulating test device and analog detection method of cement sheath microannulus Download PDFInfo
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- CN106917620A CN106917620A CN201710192740.3A CN201710192740A CN106917620A CN 106917620 A CN106917620 A CN 106917620A CN 201710192740 A CN201710192740 A CN 201710192740A CN 106917620 A CN106917620 A CN 106917620A
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- inner cylinder
- outer barrel
- barrel
- microannulus
- cement
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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
- E21B47/00—Survey of boreholes or wells
- E21B47/005—Monitoring or checking of cementation quality or level
-
- 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
- E21B47/00—Survey of boreholes or wells
- E21B47/002—Survey of boreholes or wells by visual inspection
Abstract
The application provides a kind of simulating test device and analog detection method of cement sheath microannulus, wherein, described device includes inner cylinder and outer barrel, annular space is constituted between the inner cylinder and the outer barrel, the inner cylinder and the outer barrel are placed on pedestal, by covering closing on inner cylinder, the port of the outer barrel is by covering closing on outer barrel for the port of the inner cylinder；Through hole is provided with being covered on the inner cylinder, high-pressure oil pipe is embedded with the through hole；Aperture is offered in being covered on the outer barrel；Aperture is offered on the pedestal, can be to gas be injected in the annular space by the aperture on the pedestal, the aperture in being covered on the outer barrel can discharge the gas of injection；The both sides of the outer barrel are provided with ultrasonic imager, are scanned with to the outer barrel and the inner cylinder.The simulating test device and analog detection method of a kind of cement sheath microannulus that the application is provided, can real-time judge microannulus whether produce, and the cementing situation of cement and barrel can be obtained with visual pattern.
Description
Technical field
The application is related to Oil/gas Well development technique field, the simulating test device of more particularly to a kind of cement sheath microannulus and
Analog detection method.
Background technology
Behavior of Hardened Cement Paste is a kind of fragile material with birth defect, and underground cement ring is in perforating bullet high energy conflux impulsive force
Under effect, can rupture to form macroscopic cracking, the follow-up well stimulation in Oil/gas Well development process makes these crackles further expand,
The packing of cement sheath is caused to act on thoroughly failure.The contraction of other Behavior of Hardened Cement Paste makes interface produce microgap, after these can all cause
There is air water and alter in the phase.The external research to underground cement ring microannulus mainly has two means：Experimental study and numerical computations.
Experimental study aspect, the main method for using is to inject cement in two-layer concentric tubes, in inner layer sleeve after cement is consolidated
The interior temperature applied in hydraulic pressure or change sleeve pipe, the stress shape of cement sheath in two-layer sleeve pipe is changed by pressure or temperature change
State, by the infiltrative cementing property of waterpower for changing analysis cement sheath of annular space cement sheath.The country devises a kind of well cementation at present
Cement sheath integrality Simulation evaluation test instrument, can simulate the environmental condition of the underground residing for cementing concrete ring, simulate underground pressure
Damage of the power to cementing concrete ring, cementing concrete ring health alters the situation of change of intensity under measure different condition, so that evaluating cementing
The toughness and packing reliability of cement sheath.Additionally, the country have also been devised a kind of deep water cementing cement sheath packing performance surveying
Trial assembly is put, and hydraulic load change, temperature varied cyclical are to deep water cementing cement sheath packing performance shadow under the conditions of can simulating Different Strata
Ring.In the recent period, the country have also been devised a kind of HTHP cementing concrete ring mechanical integrity test device, simulate in different tubing strings
Damage deterioration of the cement sheath in high temperature and high pressure environment under structure.But these research devices fail whether real-time judge microannulus produces
It is raw, the cementing situation of cement and barrel can not be obtained with visual pattern.
It should be noted that the introduction of technical background is intended merely to above the convenient technical scheme to the application carry out it is clear,
Complete explanation, and facilitate the understanding of those skilled in the art and illustrate.Can not be merely because these schemes be the application's
Background section is set forth and thinks that above-mentioned technical proposal is known to those skilled in the art.
The content of the invention
The purpose of the application implementation method is to provide a kind of simulating test device and simulation test of cement sheath microannulus
Method, can real-time judge microannulus whether produce, and the cementing situation of cement and barrel can be obtained with visual pattern.
To achieve the above object, on the one hand the application provides a kind of simulating test device of cement sheath microannulus, the dress
Put including inner cylinder and outer barrel, annular space is constituted between the inner cylinder and the outer barrel, the inner cylinder and the outer barrel are placed in pedestal
On, by covering closing on inner cylinder, the port of the outer barrel is by covering closing on outer barrel for the port of the inner cylinder；Opened in being covered on the inner cylinder
There is through hole, high-pressure oil pipe is embedded with the through hole, can be to injecting liquid in the inner cylinder by the high-pressure oil pipe；Institute
To state on outer barrel and offer aperture in lid, by being covered on the outer barrel in aperture can be to injecting liquid in the annular space；The base
Aperture is offered on seat, can be small in being covered on the outer barrel to gas is injected in the annular space by the aperture on the pedestal
Hole can discharge the gas of injection；The both sides of the outer barrel are provided with ultrasonic imager, with to the outer barrel and described
Inner cylinder is scanned.
Further, the internal stress piece for detecting deformation, the barrel of the outer barrel are installed on the barrel of the inner cylinder
On external carbuncle piece for detecting deformation is installed.
Further, the inner cylinder is filled with lower plug near one end of the pedestal, and O-ring is cased with the lower plug
And back-up ring.
Further, one end of the outer barrel is fixed on the pedestal by outer drum flange, and O is cased with the outer drum flange
Shape circle and back-up ring.
Further, the upper end covered on the inner cylinder is provided with the drawing for detecting the pressure and pulling force put in inner cylinder
Pressure sensor.
Further, described device also includes cylinder barrel and hydraulic pressure top board, and the cylinder barrel embeds the one end for being cased with piston rod, institute
State the lower port of cylinder barrel to be connected with the cylinder top cover of center drilling, the piston rod passes through perforate and institute in the cylinder top cover
State to be covered on inner cylinder and be connected, the hydraulic pressure top board is located on the top end face of the cylinder barrel.
Further, polyurethane oil sealing, the work are filled between the outside of the inwall of the cylinder barrel and the piston rod
On stopper rod and the cylinder top cover polyurethane oil sealing is also filled between the inwall of perforate.
To achieve the above object, the application implementation method also provides a kind of analog detection method of cement sheath microannulus, institute
The method of stating includes：By being arranged at the high-pressure oil pipe on inner cylinder on lid to liquid is injected in inner cylinder, with the hydraulic pressure in simulation wellbore hole；
Cement mortar, and the aperture by being opened up in lid on outer barrel are injected in the annular space that inner cylinder and outer barrel are formed, is noted in the annular space
Enter liquid, to simulate the pressure in the annular space；After the cement slurry sets, to applying preset pressure and pulling force in inner cylinder,
And the aperture by being opened up on pedestal, to injecting gas in the annular space；Collected by the aperture opened up on lid on the outer barrel
Whether the gas of leakage, microannulus is produced with the cement detected in the annular space；Using ultrasonic imager, to the inner cylinder and
The outer barrel is scanned, with determine the first interface and second contact surface respectively with the cementing information of cement, wherein, first boundary
Face is the interface between cement and inner cylinder barrel, and the second contact surface is the interface between cement and outer barrel barrel.
Further, methods described also includes：Using the internal stress piece that is installed on inner cylinder barrel and it is installed on outer barrel cylinder
External carbuncle piece on wall, detects the pressure on inner cylinder barrel and outer barrel barrel respectively.
Further, methods described also includes：Using the pull pressure sensor being arranged on the inner cylinder on lid, detection is applied
It is added on pressure and pulling force in inner cylinder.
The application implementation method utilizes inner cylinder and outer barrel, can simulate the annular space residing for cement, can be with by high-pressure oil pipe
To liquid is injected in inner cylinder, so that the hydraulic pressure in simulation wellbore hole.The aperture opened up in by being covered in outer barrel can be noted in annular space
Enter liquid, so that for cement provides hydraulic pressure, to simulate real ground environment.After theing cement solidifies, can be by pedestal
The aperture for opening up, to gas is injected in annular space, by detecting whether the aperture on outer barrel in lid has gas to discharge, such that it is able to first
Step determines whether to generate microannulus.Outer barrel and inner cylinder are scanned by ultrasonic imager, such that it is able in real time with
Visual form show the first interface and second contact surface respectively with the cementing information of cement.So, the application implementation method is carried
The simulating test device and analog detection method of a kind of cement sheath microannulus for supplying, can in real time judge whether microannulus produces
It is raw, and the cementing situation of cement and barrel can be obtained with visual pattern.
With reference to explanation hereinafter and accompanying drawing, the particular implementation of the application is disclose in detail, specify the original of the application
Reason can be in adopted mode.It should be understood that presently filed embodiment is not so limited in scope.In appended power
In the range of the spirit and terms that profit is required, presently filed embodiment includes many changes, modifications and is equal to.
The feature for describing and/or showing for a kind of implementation method can be in same or similar mode one or more
Used in individual other embodiment, it is combined with feature in other embodiment, or substitute the feature in other embodiment.
It should be emphasized that term "comprises/comprising" refers to the presence of feature, one integral piece, step or component when being used herein, but simultaneously
It is not excluded for the presence of one or more further features, one integral piece, step or component or additional.
Brief description of the drawings
Included accompanying drawing is used for providing being further understood from the application implementation method, which constitutes the one of specification
Part, for illustrating presently filed embodiment, and comes together to explain the principle of the application with word description.It should be evident that
Drawings in the following description are only some implementation methods of the application, for those of ordinary skill in the art, are not being paid
On the premise of going out creative labor, other accompanying drawings can also be obtained according to these accompanying drawings.In the accompanying drawings：
Fig. 1 is the structural representation of the simulating test device of cement sheath microannulus in the application implementation method；
Fig. 2 is the analog detection method flow chart of cement sheath microannulus in the application implementation method.
Specific embodiment
In order that those skilled in the art more fully understand the technical scheme in the application, below in conjunction with the application reality
The accompanying drawing in mode is applied, the technical scheme in the application implementation method is clearly and completely described, it is clear that described
Implementation method is only a part of implementation method of the application, rather than whole implementation methods.Based on the embodiment party in the application
Formula, all other implementation method that those of ordinary skill in the art are obtained under the premise of creative work is not made all should
When the scope for belonging to the application protection.
Fig. 1 is referred to, the application implementation method provides a kind of simulating test device of cement sheath microannulus.Described device bag
Inner cylinder 9 and outer barrel 10 are included, annular space is constituted between the inner cylinder 9 and the outer barrel 10, the inner cylinder 9 and the outer barrel 10 are placed in
On pedestal 2, the port of the inner cylinder 9 is closed by lid on inner cylinder 13, and the port of the outer barrel 10 is closed by lid on outer barrel 17；It is described
Through hole (not shown) is provided with inner cylinder in lid 13, high-pressure oil pipe 8 is embedded with the through hole, by the high-pressure oil pipe 8
Can be to injecting liquid in the inner cylinder 9；Aperture (not shown) is offered on the outer barrel in lid 17, by lid 17 on the outer barrel
In aperture can be to injecting liquid in the annular space；Aperture (not shown) is offered on the pedestal 2, by the pedestal 2
Aperture can be to gas be injected in the annular space, the aperture on the outer barrel in lid 17 can discharge the gas of injection；Institute
The both sides for stating outer barrel 10 are provided with ultrasonic imager (not shown), are scanned with to the outer barrel 10 and the inner cylinder 9.
In the present embodiment, sometimes for the temperature of simulated formation, can be by heater assembly by kettle
Heating oil is heated to setting value, then can place the simulating test device of the cement sheath microannulus in the application implementation method
In the kettle.The kettle can be the tubbiness mechanism that can house the simulating test device, and mould is carried out in kettle
Intend the process of test, ensure that temperature fluctuation is smaller.
In the present embodiment, the annular space between the cement mortar injection inner cylinder 9 and outer barrel 10 that will can configure in advance, so
Afterwards by the high-pressure oil pipe 8, can be to oil be injected in inner cylinder 9, so that the hydraulic pressure in simulation wellbore hole.Further, it is also possible to pass through
The high-pressure oil pipe 8, to certain pressure and pulling force is applied in inner cylinder 9, to simulate the pressure and pulling force suffered by down-hole casing.
In the present embodiment, after injecting cement mortar in annular space, the aperture in lid 17 on outer barrel can be continued through,
To water is injected in annular space, such that it is able to simulate the pressure in annular space.Treat after cement slurry sets, can be changed by high-pressure oil pipe 8
Become the pressure in inner cylinder.So, at various pressures, it is possible that microannulus between cement and inner tube wall and outer tube wall.
Wherein, the interface between cement and inner cylinder barrel be able to can be made as the first interface, the interface between cement and outer barrel barrel
It is second contact surface.In the present embodiment, in order to whether there is microannulus to produce inside Preliminary detection cement sheath, can be by pedestal
Aperture on 2 is to nitrogen injection in annular space, if occurring in that continuous microannulus on the first interface and second contact surface, then nitrogen
Gas just can be altered to the top of annular space from the bottom of annular space, such that it is able to pass through the aperture effusion on outer barrel in lid 17.Pass through
Whether the nitrogen on detection outer barrel in lid 17 at aperture, continuous microannulus is generated such that it is able to test inside cement sheath.
In the present embodiment, if generating microannulus on the first interface and second contact surface, but microannulus does not connect
If continuous, nitrogen cannot also be escaped at the aperture from outer barrel in lid 17, therefore, the method that microannulus is detected by nitrogen is inadequate
Comprehensively.In consideration of it, the application implementation method can be swept by ultrasonic imager to the outer barrel 10 and the inner cylinder 9
Retouch, such that it is able to show the cementing information at the first interface and second contact surface in visual form in real time.
In the present embodiment, ultrasonic imager may be located at the both sides of outer barrel 10, if generating micro-loop on interface
Gap, then the ultrasonic wave of injection will be reflected back.By having detected whether that ultrasonic wave is reflected to and receives back wave
Time, such that it is able to be inferred to the position of microannulus.By comparing the corresponding back wave of different microannuluses, can also determine many
The relative size of individual microannulus.
In the present embodiment, in order to stress suffered on real-time detection inner cylinder and outer barrel, can be in the inner cylinder
Barrel on internal stress piece 11 for detecting deformation is installed, it is also possible to be provided with for detecting on the barrel of the outer barrel
The external carbuncle piece 12 of deformation.
In the present embodiment, the inner cylinder 9 is filled with lower plug 1, the lower plug 1 near one end of the pedestal 2
On be cased with O-ring 3 and back-up ring 5, thereby may be ensured that the sealing of inner cylinder 9.
In the present embodiment, one end of the outer barrel 10 is fixed on the pedestal 2 by outer drum flange 4, the outer barrel
O-ring 6 and back-up ring 7 are cased with flange 4, the stability of outer barrel 10 is thereby may be ensured that.
In the present embodiment, on the inner cylinder upper end of lid 13 be provided with for detect put on pressure in inner cylinder and
The pull pressure sensor 19 of pulling force, so, when by high-pressure oil pipe 8 to inner cylinder 9 in apply pressure and pulling force when, can be accurately
Control the amount of the pressure and pulling force for applying.
In the present embodiment, described device also includes cylinder barrel 25 and hydraulic pressure top board 26, and the cylinder barrel 25 is embedded to be cased with living
One end of stopper rod 21, the lower port of the cylinder barrel 25 is connected with the cylinder top cover 20 of center drilling, and the piston rod 21 passes through institute
The perforate stated in cylinder top cover 20 is connected with lid 13 on the inner cylinder, and the hydraulic pressure top board 26 is located at the top end face of the cylinder barrel 25
On.Moved in the cylinder barrel 25 by the piston rod 21, such that it is able to drive lid 13 on inner cylinder, so can be by applying
External force, lid on inner cylinder 13 is lifted or is separated with inner cylinder.
In the present embodiment, polyurethane oil is filled between the outside of the inwall of the cylinder barrel 25 and the piston rod 21
Envelope 24, is also filled with polyurethane oil sealing 22, so that can on the piston rod 21 and the cylinder top cover 20 between the inwall of perforate
To ensure the sealing between interface.
Fig. 2 is referred to, the application implementation method provides a kind of analog detection method of cement sheath microannulus, methods described bag
Include：
S1：By being arranged at the high-pressure oil pipe on inner cylinder on lid to liquid is injected in inner cylinder, with the hydraulic pressure in simulation wellbore hole；
S2：Cement mortar, and the aperture by being opened up in lid on outer barrel are injected in the annular space that inner cylinder and outer barrel are formed, to institute
State and inject liquid in annular space, to simulate the pressure in the annular space；
S3：It is and small by what is opened up on pedestal to preset pressure and pulling force is applied in inner cylinder after the cement slurry sets
Hole, to injecting gas in the annular space；
S4：The gas of leakage is collected by the aperture opened up on lid on the outer barrel, to detect the cement in the annular space
Whether microannulus is produced；
S5：Using ultrasonic imager, the inner cylinder and the outer barrel are scanned, to determine the first interface and second
Interface respectively with the cementing information of cement, wherein, first interface is interface between cement and inner cylinder barrel, described second
Interface is the interface between cement and outer barrel barrel.
In the present embodiment, methods described also includes：
Using the internal stress piece being installed on inner cylinder barrel and the external carbuncle piece being installed on outer barrel barrel, detect respectively interior
Pressure on cylinder barrel and outer barrel barrel.
In the present embodiment, methods described also includes：
Using the pull pressure sensor being arranged on the inner cylinder on lid, detection puts on pressure and pulling force in inner cylinder.
Therefore, the application implementation method utilizes inner cylinder and outer barrel, the annular space residing for cement can be simulated, by high pressure
Oil pipe can be to liquid be injected, so that the hydraulic pressure in simulation wellbore hole in inner cylinder.The aperture that opens up can be in by being covered in outer barrel
Injection liquid in annular space, so that for cement provides hydraulic pressure, to simulate real ground environment.After theing cement solidifies, Ke Yitong
The aperture opened up on pedestal is crossed, to gas is injected in annular space, by detecting whether the aperture on outer barrel in lid has gas to discharge, from
And whether microannulus can be generated with preliminary judgement.Outer barrel and inner cylinder are scanned by ultrasonic imager, such that it is able to
Show in visual form in real time the first interface and second contact surface respectively with the cementing information of cement.So, the application reality
The simulating test device and analog detection method of a kind of cement sheath microannulus that the mode of applying is provided, can in real time judge microannulus
Whether produce, and the cementing situation of cement and barrel can be obtained with visual pattern.
Description to the various implementation methods of the application above is supplied to those skilled in the art with the purpose for describing.It is not
Be intended to exhaustion or be not intended to limit the invention to single disclosed embodiment.As described above, the application's is various
Substitute and change will be apparent for above-mentioned technology one of ordinary skill in the art.Therefore, although specifically beg for
The implementation method of some alternatives has been discussed, but other embodiment will be apparent, or those skilled in the art are relative
Easily draw.The application is intended to be included in this of the invention all replacement for having discussed, modification and change, and falls
Other embodiment in the spirit and scope of above-mentioned application.
Each implementation method in this specification is described by the way of progressive, identical similar between each implementation method
Part mutually referring to what each implementation method was stressed is the difference with other embodiment.
Although depicting the application by implementation method, it will be appreciated by the skilled addressee that the application has many deformations
With change without deviating from spirit herein, it is desirable to which appended claim includes these deformations and changes without deviating from the application
Spirit.
Claims (10)
1. a kind of simulating test device of cement sheath microannulus, it is characterised in that described device includes inner cylinder and outer barrel, it is described in
Annular space is constituted between cylinder and the outer barrel, the inner cylinder and the outer barrel are placed on pedestal, and the port of the inner cylinder is by inner cylinder
Upper lid closing, the port of the outer barrel is by covering closing on outer barrel；Through hole is provided with being covered on the inner cylinder, it is interior in the through hole
High-pressure oil pipe is embedded with, can be to injecting liquid in the inner cylinder by the high-pressure oil pipe；Aperture is offered in being covered on the outer barrel,
Aperture in by being covered on the outer barrel can be to injecting liquid in the annular space；Aperture is offered on the pedestal, by described
Aperture on pedestal can be to gas be injected in the annular space, the aperture in being covered on the outer barrel can discharge the gas of injection；
The both sides of the outer barrel are provided with ultrasonic imager, are scanned with to the outer barrel and the inner cylinder.
2. the simulating test device of cement sheath microannulus according to claim 1, it is characterised in that the barrel of the inner cylinder
On internal stress piece for detecting deformation is installed, the external carbuncle piece for detecting deformation is installed on the barrel of the outer barrel.
3. the simulating test device of cement sheath microannulus according to claim 1, it is characterised in that the inner cylinder is near institute
One end of pedestal is stated filled with lower plug, O-ring and back-up ring are cased with the lower plug.
4. the simulating test device of cement sheath microannulus according to claim 1, it is characterised in that one end of the outer barrel
It is fixed on the pedestal by outer drum flange, O-ring and back-up ring is cased with the outer drum flange.
5. the simulating test device of cement sheath microannulus according to claim 1, it is characterised in that covered on the inner cylinder
Upper end is provided with the pull pressure sensor for detecting the pressure and pulling force put in inner cylinder.
6. the simulating test device of cement sheath microannulus according to claim 1, it is characterised in that described device also includes
Cylinder barrel and hydraulic pressure top board, the cylinder barrel embed the one end for being cased with piston rod, the lower port of the cylinder barrel and the cylinder barrel of center drilling
Top cover is connected, and the piston rod is connected with cover on the inner cylinder through the perforate in the cylinder top cover, the hydraulic pressure top board
In on the top end face of the cylinder barrel.
7. the simulating test device of cement sheath microannulus according to claim 6, it is characterised in that the inwall of the cylinder barrel
Be filled with polyurethane oil sealing and the outside of the piston rod between, the inwall of the piston rod and perforate in the cylinder top cover it
Between be also filled with polyurethane oil sealing.
8. the cement in a kind of simulating test device of the cement sheath microannulus being applied to as described in any in claim 1 to 7
The analog detection method of ring microannulus, it is characterised in that methods described includes：
By being arranged at the high-pressure oil pipe on inner cylinder on lid to liquid is injected in inner cylinder, with the hydraulic pressure in simulation wellbore hole；
Cement mortar, and the aperture by being opened up in lid on outer barrel are injected in the annular space that inner cylinder and outer barrel are formed, to the annular space
Middle injection liquid, to simulate the pressure in the annular space；
After the cement slurry sets, to preset pressure and pulling force, and the aperture by being opened up on pedestal is applied in inner cylinder, to institute
State injection gas in annular space；
The gas of leakage is collected by the aperture opened up on lid on the outer barrel, whether is produced with the cement detected in the annular space
Microannulus；
Using ultrasonic imager, the inner cylinder and the outer barrel are scanned, to determine the first interface and second contact surface point
Not with the cementing information of cement, wherein, first interface is the interface between cement and inner cylinder barrel, and the second contact surface is
Interface between cement and outer barrel barrel.
9. the analog detection method of cement sheath microannulus according to claim 8, it is characterised in that methods described is also wrapped
Include：
Using the internal stress piece being installed on inner cylinder barrel and the external carbuncle piece being installed on outer barrel barrel, internal barrel is detected respectively
Pressure on wall and outer barrel barrel.
10. the analog detection method of cement sheath microannulus according to claim 8, it is characterised in that methods described is also wrapped
Include：
Using the pull pressure sensor being arranged on the inner cylinder on lid, detection puts on pressure and pulling force in inner cylinder.
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| CN111058827A (en) * | 2019-10-30 | 2020-04-24 | 武汉光谷航天三江激光产业技术研究院有限公司 | Underground cross flow simulation monitoring system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111058827A (en) * | 2019-10-30 | 2020-04-24 | 武汉光谷航天三江激光产业技术研究院有限公司 | Underground cross flow simulation monitoring system |
| CN111058827B (en) * | 2019-10-30 | 2023-06-02 | 武汉光谷航天三江激光产业技术研究院有限公司 | Underground channeling simulation monitoring system |
| CN110879120A (en) * | 2019-11-20 | 2020-03-13 | 广州供电局有限公司 | Simulation structure of composite insulation structure, interface sealing performance test system and method |
| CN110879120B (en) * | 2019-11-20 | 2022-02-01 | 广东电网有限责任公司广州供电局 | Simulation structure of composite insulation structure, interface sealing performance test system and method |
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