CN107063649A - The underwater wellhead annular space sealing ground test device of pressurization can be loaded simultaneously - Google Patents
The underwater wellhead annular space sealing ground test device of pressurization can be loaded simultaneously Download PDFInfo
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- CN107063649A CN107063649A CN201611074691.5A CN201611074691A CN107063649A CN 107063649 A CN107063649 A CN 107063649A CN 201611074691 A CN201611074691 A CN 201611074691A CN 107063649 A CN107063649 A CN 107063649A
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- pressurization
- annular space
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M13/00—Testing of machine parts
Abstract
Ground test device, including simulated high-pressure well head head, analog casing hanger, metal sealing assembly, block, sealing gland, piston body and upper press cover are sealed the present invention relates to a kind of underwater wellhead annular space that can load pressurization simultaneously；The centre hole side wall sealing of sealing gland bottom and analog casing hanger coordinates, top and simulated high-pressure well head head inner wall sealing coordinate, piston body cooperatively forms annular seal space with the sealing of upper press cover bottom opening side wall, simulated high-pressure well head head outer wall is provided with the moulding pressure injection channel connected with cavity volume where metal sealing assembly and boost pressure sensor passage, and upper press cover top surface is provided with the on-load pressure injection channel connected with annular seal space and load sensor passage.The device can be realized while loading pressurization, the accurately and efficiently sealing of simulation annular space are installed and test process, and ballast unit loads size and accurately controlled, and can obtain accurately sealing excitation ballast, simple in construction, easy to assembly.
Description
Technical field
The invention belongs to offshore oil oil production equipment technical field, and in particular to a kind of to load the underwater well of pressurization simultaneously
Oral annular space seals ground test device.
Background technology
In view of the high risk of marine oil and gas production, sealing property turns into the core index of oil gas equipment under water.Current water
During lower oil-gas mining, underwater wellhead annular space mainly use metal sealing assembly, metal sealing assembly by metal o-ring,
Driving ring and shear pin composition (shear pin connects metal o-ring with sealing driving ring) are sealed, such sealing is certainly
Compact form is sealed, and sealing excitation must be carried out when mounted, self-tightening effect could be played in normal operation, i.e. such is sealed
Principle is that sealing excitation is realized by the way that sealing driving ring is squeezed into the U-shaped chamber of metal o-ring, but based on construction technology influence,
Such annular space seal one common feature of generally existing, that is, seal driving ring and it is indirect be pressed directly into by ballast, but apply
Encourage internal pressure to support after the U-shaped chamber of big metal o-ring, then sealing driving ring is pressed into place, it is thus right in construction operation to reduce
The requirement of ballast.I.e., under real conditions, metal sealing assembly realizes sealing excitation by loading pressurization simultaneously.
But, current underwater wellhead annular space sealing ground test device can not be realized while the sealing for loading pressurization swashs
Encourage mode --- the mode of being loaded directly into is used at present, i.e., directly passes through large press (small-sized press ballast and working space
Requirement can not be met) sealing driving ring is pressed onto maximum displacement, this mode contains various disadvantages：1. the requirement of pair test equipment compared with
Height, testing cost is high；2. large press ballast is difficult to accurate control, it is impossible to obtains accurately sealing excitation ballast and easily overloads
Damage sealing ring；3. which can not accurate simulation correctly seal mounting means, lose the meaning of test.
In summary, it is necessary to design a set of can realize while applying ballast and excitation internal pressure, accurately and efficiently simulating
Annular space sealing installation and the annular space sealing test device of test process, and take into account inexpensive, easy to operate and reusable.
The content of the invention
Ground test device is sealed it is an object of the invention to provide a kind of underwater wellhead annular space that can load pressurization simultaneously,
The device can be realized while loading pressurization, the accurately and efficiently sealing of simulation annular space are installed and test process, and ballast unit loads big
It is small to accurately control, accurately sealing excitation ballast can be obtained, it is simple in construction, easy to assembly.
The technical solution adopted in the present invention is：
A kind of underwater wellhead annular space sealing ground test device that can load pressurization simultaneously, including simulated high-pressure well head
Head, sit be placed in simulated high-pressure well head head analog casing hanger, be stuck in simulated high-pressure well head head and analog casing hanger
(metal sealing assembly includes metal o-ring, sealing driving ring and the shearing cooperated to metal sealing assembly in annular space
Pin), it is dismountable be stuck in simulated high-pressure well block in word, the sealing gland being placed in sealing driving ring, be placed on it is close
Piston body, bottom opening on sealed cover cover on the piston body and top is by the spacing upper press cover of block；Sealing gland bottom
Centre hole side wall sealing with analog casing hanger coordinates, top and simulated high-pressure well head head inner wall sealing coordinate, piston body
Annular seal space is cooperatively formed with the sealing of upper press cover bottom opening side wall, simulated high-pressure well head head outer wall is provided with and metal sealing assembly
The moulding pressure injection channel of place cavity volume connection and boost pressure sensor passage, upper press cover top surface is provided with adding for being connected with annular seal space
Carry pressure injection channel and load sensor passage.
Further, simulated high-pressure well head head outer wall is provided with least two moulding pressure injection channels, upper press cover top surface
Provided with least two on-load pressure injection channels.
Further, the inlet of moulding pressure injection channel is higher than between sealing gland and simulated high-pressure well head head inwall
Lowest part seal.
Further, block is formed by the cutting of overall baffle ring, and two lateral sections of one of block are parallel.
Further, simulated high-pressure well head head outer wall is provided with the solution lockhole for extending to block outer wall.
Further, analog casing hanger is provided with relief hole, and relief hole is located at below metal sealing assembly.
Further, it is all provided with simulated high-pressure well head head, analog casing hanger, upper press cover, piston body and sealing gland
There is hole for hoist.
Further, provided with the opening connected with upper press cover bottom opening at the top of upper press cover, pressure is stretched at piston body top
Sealed in tops opening and with gland open top side wall.
Further, sealing gland top surface, which is provided with groove, groove, offers through hole, through hole and analog casing hanger
Centre bore is connected, and what piston body bottom coordinated is located in groove.
Further, between sealing gland and simulated high-pressure well head head on, between sealing gland and analog casing hanger,
Two seals part is respectively provided between gland and piston body, per pass seal is O-ring and back-up ring.
The beneficial effects of the invention are as follows：
1. during test, according to design ballast value, suppressed by on-load pressure injection channel into annular seal space, piston body passes through
Means of press seals driving ring under sealing gland, initial sealing is set up, according to design sealing activation pressure value, inject logical by moulding pressure
Road is suppressed to cavity volume where metal sealing assembly, encourages sealing, meanwhile, according to design sealing excitation ballast value, lower means of press seals is driven
After rotating ring, excitation internal pressure and ballast apply in place, pressurize certain time, unloading, decompression so far, seal installation, foundation
Testing process, carries out every pressure test, pressures cycle test and temperature test；Upper press cover and piston body composition loading unit,
Realize that load applies by suppressing, and ballast load is accurately controlled by adjusting sealing cavity pressure；Metal sealing assembly and close
Sealed cover constitutes presser unit, can be achieved while loading pressurization, accurately and efficiently simulation annular space sealing installation and test process；Pressure
Carrier unit loading size accurately controls (the external pressure sensor of boost pressure sensor passage), can obtain accurately sealing excitation
Ballast, while can verify that the sealability under different ballasts, Optimizing Process Parameters；Whole device is simple in construction, easy to assembly, system
Cause this low and reusable.
2. during test, pressurizeed by a moulding pressure injection channel and an on-load pressure injection channel, empty metal
Cavity volume where seal assembly and the air in annular seal space, until remaining moulding pressure injection channel and on-load pressure injection channel
There is fluid outflow, stop injection, tighten plug again respectively.
3. the setting of the inlet of moulding pressure injection channel, is easy to hold intracavity gas where emptying metal sealing assembly.
4. block piecemeal is mounted and dismounted, two lateral sections of one of block are parallel, and last block is kept off during convenient installation
Block is smoothly caught in.
5. dismantled after test, if block can not smoothly be taken out due to clamping, pushed away using rod iron by solving lockhole
Go out block.
Closed cavity is formed at metal sealing assembly bottom when 6. relief hole can avoid installing, it is impossible to be installed in place；Meanwhile,
Also it can judge whether initial sealing forms by observing relief hole medium flow field artificial situation.
Handling when 7. hole for hoist is easily installed.
8. sealedly being stretched at the top of piston body in upper press cover open top, after the completion of piston body and upper press cover combination, pass through
Lifting can prevent separated handling to be unfavorable for installation piston body and upper press cover composite entity handling at the top of piston body.
9. through hole, which is avoided, forms closing or approximate between piston body, upper press cover, simulated high-pressure well head head and sealing gland
The cavity of closing, hinders moving up and down for piston body.
10.O types circle is applied to being slidingly sealed for shaft hole series cooperation, and back-up ring prevents O-ring axial float.
Brief description of the drawings
Fig. 1 is the sectional view of confined state of the embodiment of the present invention.
Fig. 2 is the sectional view of test mode of the embodiment of the present invention.
Fig. 3 is the schematic diagram of simulated high-pressure well head head in the embodiment of the present invention.
Fig. 4 is the top view that multiple blocks in the embodiment of the present invention surround baffle ring.
In figure：1- simulated high-pressure well head heads；2- blocks；3- upper press covers；4- piston bodies；5- sealing glands；6- sealing drivings
Ring；7- metal o-rings；8- relief holes；9- analog casing hangers；10- shear pins；11- sealing glands are hung with analog casing
O-ring and back-up ring between device；12. moulding pressure injection channel；It is O-shaped between 13- sealing glands and simulated high-pressure well head head
Circle and back-up ring；O-ring and back-up ring between 14- piston bodies bottom and upper press cover；O at the top of 15- piston bodies between upper press cover
Type circle and back-up ring；16- on-load pressures injection channel；17- boost pressure sensor passages；18- solves lockhole.
Embodiment
The present invention is further illustrated with reference to the accompanying drawings and examples.
As depicted in figs. 1 and 2, a kind of underwater wellhead annular space sealing ground test device that can load pressurization simultaneously, bag
Include simulated high-pressure well head first 1, sit the analog casing hanger 9 being placed in simulated high-pressure well head first 1 (in simulated high-pressure well head first 1
Chamber bottom is provided with inclined-plane support level, is engaged with the inclined-plane support level of analog casing hanger 9, supports analog casing hanger
9, first 1 inner surface contour of simulated high-pressure well head and standard high-voltage well head head product are completely the same), be stuck in simulated high-pressure well head first 1 and
(metal sealing assembly includes the metal o-ring 7, close cooperated to metal sealing assembly in the annular space of analog casing hanger 9
Envelope driving ring 6 and shear pin 10), dismountable block 2 being stuck on simulated high-pressure well head first 1, be placed in sealing driving ring 6
Sealing gland 5, the piston body 4, the bottom opening that are placed on sealing gland 5 are enclosed on piston body 4 and top is limited by block 2
The upper press cover 3 of position；The bottom of sealing gland 5 and centre hole side wall sealing cooperation, top and the simulated high-pressure of analog casing hanger 9
First 1 inner wall sealing of well head coordinates, and piston body 4 cooperatively forms annular seal space, simulated high-pressure well with the bottom opening side wall sealing of upper press cover 3
Oral 1 outer wall is provided with the moulding pressure injection channel 12 connected with cavity volume where metal sealing assembly and boost pressure sensor passage
17, the top surface of upper press cover 3 is provided with the on-load pressure injection channel 16 connected with annular seal space and load sensor passage.
During test, according to design ballast value, suppressed by on-load pressure injection channel 16 into annular seal space, piston body 4 leads to
Cross 5 times means of press seals driving rings 6 of sealing gland, set up initial sealing, according to design sealing activation pressure value, noted by moulding pressure
Enter passage 12 to suppress to cavity volume where metal sealing assembly, encourage sealing, meanwhile, according to design sealing excitation ballast value, push
Driving ring 6 is sealed, after excitation internal pressure and ballast apply in place, pressurize certain time, unloading, decompression, so far, sealing is installed
Into, according to testing process, the every pressure test of development, pressures cycle test and temperature test；Upper press cover 3 and piston body 4 are constituted
Loading unit, realizes that load applies by suppressing, and accurately controls ballast load by adjusting sealing cavity pressure；Metal sealing
Assembly and the composition presser unit of sealing gland 5, can be achieved while loading pressurization, accurately and efficiently simulation annular space sealing installation and surveying
Examination process；Ballast unit loading size accurately controls (the external pressure sensor of boost pressure sensor passage 17), can obtain standard
True sealing excitation ballast, while can verify that the sealability under different ballasts, Optimizing Process Parameters；The letter of whole device structure
Single, easy to assembly, manufacturing cost is low and reusable.
In the present embodiment, first 1 outer wall of simulated high-pressure well head is provided with 2 moulding pressure injection channels 12 (180 ° of interval)
With 2 boost pressure sensor passages 17 (180 ° of interval)；The top surface of upper press cover 3 is provided with 2 on-load pressure injection channels 16 (interval
180 °) and 2 load sensor passages (180 ° of interval).During test, added by a moulding pressure injection channel 12 and one
Carry pressure injection channel 16 to pressurize, cavity volume where emptying metal sealing assembly and the air in annular seal space, until remaining pressurization
There is fluid outflow pressure injection channel 12 and on-load pressure injection channel 16, stop injection, tighten plug again respectively.
In the present embodiment, the inlet of moulding pressure injection channel 12 is higher than sealing gland 5 and simulated high-pressure well head first 1
Lowest part seal between inwall.The setting of the inlet of moulding pressure injection channel 12, is easy to empty metal sealing assembly
Place holds intracavity gas.
As shown in figure 4, in the present embodiment, block 2 is by the cutting of overall baffle ring into (simulated high-pressure well head first 1 is provided with
The annular slot coordinated with baffle ring, one side of something of block 2 is pushed down upper press cover 3, one side of something and sticked into annular slot), one of block 2
Two lateral sections are parallel.The piecemeal of block 2 is mounted and dismounted, and two lateral sections of one of block 2 are parallel, it is convenient when installing last
Block block 2 is smoothly caught in.
As shown in Figure 1 to Figure 3, in the present embodiment, first 1 outer wall of simulated high-pressure well head is provided with and extends to the outer wall of block 2
Solution lockhole 18.When being dismantled after test, if block 2 can not smoothly be taken out due to clamping, using rod iron by solving lockhole
18 release block 2.
As depicted in figs. 1 and 2, in the present embodiment, analog casing hanger 9 is provided with relief hole 8, and relief hole 8 is located at
Below metal sealing assembly.Closed cavity is formed at metal sealing assembly bottom when relief hole 8 can avoid installing, it is impossible to be installed to
Position；Meanwhile, also it can judge whether initial sealing forms by observing the medium flow field artificial situation of relief hole 8.
In the present embodiment, the first 1 outer wall upper and lower part of simulated high-pressure well head respectively sets 4 holes for hoist (between hole for hoist
90 ° of interval), the upper surface of analog casing hanger 9 and lower surface be respectively provided with 4 holes for hoist (90 ° are spaced between hole for hoist), sealing
It is each that the upper surface of gland 5 and lower surface are respectively provided with 4 holes for hoist (90 ° are spaced between hole for hoist), the upper surface of upper press cover 3 and lower surface
Provided with 4 holes for hoist (90 ° are spaced between hole for hoist), the upper surface of piston body 4 provided with 1 hole for hoist, lower surface provided with 4 liftings
Hole (is spaced 90 °) between hole for hoist.Handling when hole for hoist is easily installed.
As depicted in figs. 1 and 2, in the present embodiment, the top of upper press cover 3 is provided with and opening that the bottom opening of upper press cover 3 is connected
Mouthful, the top of piston body 4 is stretched into the open top of upper press cover 3 and sealed with gland open top side wall.The top of piston body 4 is sealedly
Stretch into the open top of upper press cover 3, can be by work by lifting the top of piston body 4 after the completion of piston body 4 and the combination of upper press cover 3
Cock body 4 and the composite entity handling of upper press cover 3, prevent separated handling to be unfavorable for installation.
As depicted in figs. 1 and 2, in the present embodiment, the top surface of sealing gland 5 is provided with groove, groove and offers through hole, leads to
Hole is connected with the centre bore of analog casing hanger 9, and what the bottom of piston body 4 coordinated is located in groove.Through hole avoids piston body
4th, closing or the cavity approximately closed are formed between upper press cover 3, simulated high-pressure well head first 1 and sealing gland 5, piston body 4 is hindered
Move up and down.
As depicted in figs. 1 and 2, in the present embodiment, between sealing gland 5 and simulated high-pressure well head first 1, sealing gland 5
Two seals part is respectively provided between analog casing hanger 9, between upper press cover 3 and piston body 4, per pass seal is O
Type circle and back-up ring (11,13,14 and 15).O-ring is applied to being slidingly sealed for shaft hole series cooperation, and back-up ring prevents O-ring from axially altering
It is dynamic.
The installation process of the embodiment of the present invention is：
1) the first 1 top hole for hoist of simulated high-pressure well head is utilized, lifting tool is connected with simulated high-pressure well head first 1, by it
Hang to test site level ground or platform, using the top hole for hoist of analog casing hanger 9, lifted seat and be placed on mould
Intend in high-pressure well oral 1, connected metal o-ring 7 with sealing driving ring 6 using shear pin 10, and be integrally positioned over mould
Intend the top of casing hanger 9, until it is consolidated.
2) cleaning sealing gland 5 path, big footpath seal groove, coating lubricating oil, and be respectively mounted 0 type circle and back-up ring (11 Hes
13).Using the top hole for hoist of sealing gland 5, simulated high-pressure well head first 1 is loaded into, seat is put in sealing driving ring 6 top.
3) by the small radially horizontal positioned of piston body 4, cleaning path, big footpath seal groove, coating lubricating oil, and be respectively mounted
O-ring and back-up ring (14 and 15), using the small bore end holes for hoist of upper press cover 3, upper press cover 3 are sat and is put in the top of piston body 4, and caused
The path of piston body 4 is stretched out by the endoporus of upper press cover 3, and using the miner diameter end hole for hoist of piston body 4, piston body 4 and upper press cover 3 one are lifted by crane
Put on the first groove of 1 interior sealing gland 5 of simulated high-pressure well head.
4) block 2 is installed, first 1 annular slot of simulated high-pressure well head is sequentially clamped in, notes two lateral sections finally are installed parallel
Block 2.
5) the first 1 moulding pressure injection channel 12 of simulated high-pressure well head connects a hydraulic joint, boost pressure sensor passage 17
A pressure sensor is connected, remaining holes is blocked with plug, the loading pressure pressure of upper press cover 3 injection channel connects a hydraulic pressure and connect
Head, load sensor passage connects a pressure sensor, and remaining holes is blocked with plug, so far, and test device connection is finished,
Setup test.
The test process of the embodiment of the present invention is：
1) simulated high-pressure well head first 1 and upper press cover 3 lay down a plug respectively, and inject fluid Jie by hydraulic joint
Hold chamber air where matter, emptying annular seal space and metal sealing assembly, until there is fluid outflow at the plug place of laying down, stop injection,
Tighten plug again respectively.
2) according to design ballast value, suppressed into upper press cover 3, lower means of press seals driving ring 6 sets up initial sealing；Foundation is set
Meter sealing activation pressure value, is suppressed to the place cavity of metal o-ring 7, excitation sealing, meanwhile, according to design sealing excitation ballast
Value, lower means of press seals driving ring 6.
3) after excitation internal pressure and ballast apply in place, pressurize certain time, unloading, decompression, so far, sealing is installed
Into, according to testing process, the every pressure test of development, pressures cycle test and temperature test etc..
The unloading process of the embodiment of the present invention is：
After test terminates, 0 is reduced to by cavity pressure is held where annular seal space and metal sealing assembly, from top to down, with peace
Dress order on the contrary, be sequentially completed the dismounting of each part, wherein, block 2 may lead to not remove due to extruding tension, this
When the block 2 that can finally be installed by solving lockhole 18 to release using rod iron, realize the smooth dismounting of block 2.
It should be appreciated that for those of ordinary skills, can according to the above description be improved or converted,
And all these modifications and variations should all belong to the protection domain of appended claims of the present invention.
Claims (10)
1. a kind of underwater wellhead annular space sealing ground test device that can load pressurization simultaneously, including simulated high-pressure well head head,
Sit the analog casing hanger being placed in simulated high-pressure well head head, be stuck in simulated high-pressure well head head and analog casing hanger annular space
Interior metal sealing assembly, metal sealing assembly includes metal o-ring, sealing driving ring and the shear pin cooperated, and it is special
Levy and be：It is additionally provided with simulated high-pressure well head head and dismountable be stuck in simulated high-pressure well block in word, be placed on sealing and drive
Sealing gland, the piston body being placed on sealing gland, bottom opening on rotating ring cover on the piston body and top is by block
Spacing upper press cover；Sealing gland bottom and centre hole side wall sealing cooperation, top and the simulated high-pressure of analog casing hanger
Well head head inner wall sealing coordinates, and piston body cooperatively forms annular seal space, simulated high-pressure well head with the sealing of upper press cover bottom opening side wall
Head outer wall is provided with the moulding pressure injection channel connected with cavity volume where metal sealing assembly and boost pressure sensor passage, upper pressure
Hd top face is provided with the on-load pressure injection channel connected with annular seal space and load sensor passage.
2. the underwater wellhead annular space sealing ground test device of pressurization, its feature can be loaded simultaneously as claimed in claim 1
It is：Simulated high-pressure well head head outer wall is provided with least two moulding pressure injection channels, and upper press cover top surface is provided with least two
On-load pressure injection channel.
3. the underwater wellhead annular space sealing ground test device of pressurization, its feature can be loaded simultaneously as claimed in claim 2
It is：The inlet of moulding pressure injection channel is higher than the lowest part sealing between sealing gland and simulated high-pressure well head head inwall
Part.
4. the underwater wellhead annular space sealing ground test device of pressurization, its feature can be loaded simultaneously as claimed in claim 1
It is：Block is formed by the cutting of overall baffle ring, and two lateral sections of one of block are parallel.
5. the underwater wellhead annular space sealing ground test device of pressurization, its feature can be loaded simultaneously as claimed in claim 1
It is：Simulated high-pressure well head head outer wall is provided with the solution lockhole for extending to block outer wall.
6. the underwater wellhead annular space sealing ground test device of pressurization, its feature can be loaded simultaneously as claimed in claim 1
It is：Analog casing hanger is provided with relief hole, and relief hole is located at below metal sealing assembly.
7. the underwater wellhead annular space sealing ground test device of pressurization, its feature can be loaded simultaneously as claimed in claim 1
It is：Hole for hoist is equipped with simulated high-pressure well head head, analog casing hanger, upper press cover, piston body and sealing gland.
8. the underwater wellhead annular space sealing ground test device of pressurization, its feature can be loaded simultaneously as claimed in claim 1
It is：Provided with the opening connected with upper press cover bottom opening at the top of upper press cover, stretched at the top of piston body in upper press cover open top
And sealed with gland open top side wall.
9. the underwater wellhead annular space sealing ground test device of pressurization, its feature can be loaded simultaneously as claimed in claim 1
It is：Sealing gland top surface is provided with groove, groove and offers through hole, and through hole is connected with the centre bore of analog casing hanger,
What piston body bottom coordinated is located in groove.
10. the underwater wellhead annular space sealing ground test device of pressurization, its feature can be loaded simultaneously as claimed in claim 1
It is：Between sealing gland and simulated high-pressure well head head, between sealing gland and analog casing hanger, upper press cover and piston body
Between be respectively provided with two seals part, per pass seal is O-ring and back-up ring.
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| CN201611074691.5A CN107063649B (en) | 2016-11-29 | 2016-11-29 | The underwater wellhead annular space sealing ground test device of pressurization can be loaded simultaneously |
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| CN109000914A (en) * | 2018-07-11 | 2018-12-14 | 中海石油(中国)有限公司湛江分公司 | A kind of experimental rig and method of ring packing assembly seal body |
| RU2731436C1 (en) * | 2019-10-14 | 2020-09-02 | Общество с ограниченной ответственностью "Газпром 335" | Annular seal test bench |
| CN112832748A (en) * | 2020-12-29 | 2021-05-25 | 中石化江钻石油机械有限公司 | Pressure test device of casing hanger |
| CN113310637A (en) * | 2021-05-25 | 2021-08-27 | 中国海洋石油集团有限公司 | Annular seal assembly abnormal working condition service simulation device and sealing performance detection method |
| CN114061851A (en) * | 2021-10-12 | 2022-02-18 | 中核核电运行管理有限公司 | Self-sealing metal sealing ring performance testing system and method |
| CN114112235A (en) * | 2020-08-31 | 2022-03-01 | 中国石油天然气股份有限公司 | Mandrel type casing hanger testing device |
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