CN108956052A - A kind of rubber seal method for testing performance of resistance to carbon dioxide - Google Patents
A kind of rubber seal method for testing performance of resistance to carbon dioxide Download PDFInfo
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- CN108956052A CN108956052A CN201810414358.7A CN201810414358A CN108956052A CN 108956052 A CN108956052 A CN 108956052A CN 201810414358 A CN201810414358 A CN 201810414358A CN 108956052 A CN108956052 A CN 108956052A
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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
- G01M3/00—Investigating fluid-tightness of structures
- G01M3/02—Investigating fluid-tightness of structures by using fluid or vacuum
- G01M3/26—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors
- G01M3/28—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors for pipes, cables or tubes; for pipe joints or seals; for valves ; for welds
- G01M3/2853—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors for pipes, cables or tubes; for pipe joints or seals; for valves ; for welds for pipe joints or seals
Abstract
The invention discloses a kind of rubber seal method for testing performances of resistance to carbon dioxide, are used for CO2Rubber o-ring used in the electronic pressure gauge of oil reservoirs well testing field is directed to high pressure CO2The inspection of sealability.By the actual working state of the unilateral pressure-bearing of sealing ring used in rubber o-ring fixture and pressure vessel simulation electronic pressure gauge, pass through Tempeerature-constant air experimental box and CO2Gas-liquid booster pump etc. simulates the extreme operating conditions conditions such as temperature, pressure, the medium of above-mentioned sealing ring, well, gradually lower depth, pressure oscillation, the experiment process for going out well four-stage are included in by simulation electronic pressure, the leak pressure of tested rubber o-ring is measured simultaneously, according to the physical appearance after above-mentioned leakage situation and the test of tested rubber o-ring, the high pressure resistant CO of comprehensive descision rubber o-ring2Sealing performance.
Description
Technical field
The present invention relates to oil field well instrument sealing technique, specifically a kind of resistance to carbon dioxide performance of rubber seal
Test method.
Background technique
Electronic pressure gauge is the main downhole instrument of oily (gas) field well testing test, generallys use rubber o-ring sealing means,
Structure is simple, easy to operate, and performance meets the subsurface environment seal request of general oil/gas well high temperature and pressure and corrosive fluid.?
In carbon dioxide flooding oil reservoir well testing test, conventional rubber o-ring is difficult to bear high concentration carbon dioxide corrosion, high-pressure liquid or
Critical state carbon dioxide is easy to ooze inside rubber material, cause O circle soften extrusion, the blistering that swells, become fragile rupture, in turn result in
Seal failure needs to select using the sealing ring good enough to high-pressure carbon dioxide tolerance.Domestic standard is so far without specific
Regulation or approximation method, GB/T 5720-2008 " O shape rubber seal test method " specify only the hardness of rubber ring, stretch
The routine tests item such as performance, hot air aging, constant deformation compression set, corrosivity, shrinking percentage, resistant to liquid, low temperature resistant
Mesh；About the anti-gas explosion RED (Anti-explosion of oil and gas industry rubber material in international standard
) or the concept and O-ring test method of RGD (Rapid Gas Decompression), such as ISO Decompression
23936-2《Petroleum,petrochemical and natural gas industries—Non-metallic
materials in contact with media related to oil and gas production-Part 2:
Elastomers》、NACE TM0297《Effects of High-Temperature,High-Pressure Carbon
Dioxide Decompression on Elastomeric Materials Item》、NORSOK M-710
《Qualification of non-metallic sealing materials and manufacturers》、TOTAL GS
PVV 142 " GENERAL SPECIFICATION PIPING VALVES VESSELS " mainly uses carbon dioxide and CH4 ratio
Example mixed gas charge and discharge pressure to rubber o-ring temperature-pressure and repeatedly, then determines its anti-gas explosion performance with vision parameter.Pass through
The rubber o-ring of anti-gas explosion certification obviously has preferable tolerance high-pressure carbon dioxide performance, but in practical applications especially
It is the well testing of carbon dioxide injection well or down-hole pressure temperature long term monitoring, the problem of rubber o-ring seal failure often occurs, lead
It causes electronic pressure gauge damage to scrap, causes well testing work midway failure.Tracing it to its cause mainly has two o'clock: first is that anti-gas explosion certification
Experimental condition differs greatly with rubber o-ring actual application environment, test pressure generally only more than ten megapascal, and the two of test(ing) medium
It is generally lower to aoxidize concentration of carbon；Second is that rubber o-ring entirety pressure-bearing or the radial internal pressure of unidirectional receiving in anti-gas explosion certification test,
It is different that axial external pressure is born on electronic pressure gauge from rubber o-ring practical application.
By retrieval, similar disclosure herein document is not found.
Summary of the invention
The purpose of the present invention is to provide a kind of rubber seal method for testing performances of resistance to carbon dioxide, simulate titanium dioxide
The operating condition of carbon oil reservoirs well testing electronic pressure gauge rubber o-ring detects qualified rubber o-ring in the application of above-mentioned reality of work
Resistance to carbon dioxide performance is stablized, it is ensured that electronic pressure gauge high temperature and pressure high concentration carbon dioxide subsurface environment sealed reliable,
The success rate of carbon dioxide flooding oil reservoir well testing can be greatly improved.
In order to achieve the above objectives, present invention employs following technical solution, a kind of resistance to carbon dioxide of rubber seal
Can test method, first, the test tool constituted using rubber o-ring fixture and pressure vessel, used in simulation electronic pressure gauge
The actual working state of the unilateral pressure-bearing of sealing ring；Second, simulate temperature, the pressure, medium in above-mentioned sealing ring practical application
Upper limit operation environmental condition, including electron pressure be included in well, gradually lower depth, pressure oscillation, well four-stage out test stream
Journey；Third measures the leak pressure of tested rubber o-ring, the physical appearance after observing tested rubber o-ring test, according to upper
It states leak pressure situation and physical appearance characteristic synthetic judges the high pressure resistant CO2 sealing performance of rubber o-ring.
The structure for pressure test includes rubber o-ring fixture and pressure vessel two parts；The rubber o-ring fixture is using single
Grade rubber o-ring sealing means are processed, rubber o-ring fixture itself using with the steel for being adapted to electronic pressure gauge same model
And itself possessive construction is processed fully according to the size and technical parameter of adaptation electronic pressure gauge sealing position；The rubber
Glue O-ring fixture includes groove body, cylinder, groove drum assembly, and three's sequence is linked in sequence by screw thread, and groove drum assembly is in quantity
On two mutually concatenated are at least set；Bottom end is cylinder, and the lower end closed of cylinder, upper end are O-ring outer cylinder；Centre connection two
Groove drum assembly, groove drum assembly axially extending bore, lower end are O-ring sealed groove, and upper end is O-ring outer cylinder；Top is groove body,
Groove body axially extending bore, lower end are O-ring sealed groove, and there are connection screw thread and sealing cone in upper end；The O-ring sealed groove is equal
Tested rubber o-ring is installed；The pressure vessel includes pressure cavity shell, seal plug, pressure cap, and the seal plug blocks
Pressure cavity shell upper port, the seal plug outer wall is connect with pressure chamber inner walls for screw thread type, and the seal plug
Setting twin-stage spring energy-storage circle seals between head outer wall and pressure chamber inner walls, and pressure cavity shell upper end outer wall is also installed
For pushing down the pressure cap of seal plug, the pressure vessel filling carbon dioxide sealed pressure is not less than 120MPa, 260 DEG C of heatproof
Above, carbon dioxide corrosion resistant, the seal plug open up vertical central channel, and vertical central channel upper port connects electronics pressure
Power meter measurement end, vertical central channel lower port are tightly connected groove body upper port by screw thread and sealing cone；The tested rubber
The normal pressure of the inner cavity of Compressed CO_2 medium in glue O-ring one-side contact pressure vessel, the other side and the rubber o-ring fixture
Air communication.
The experiment process is divided into 4 stages, and first stage simulation electronic pressure gauge enters well head, and pressure is increased from normal pressure
To well head pressure 10-30MPa, temperature keeps room temperature, and the time continues 1 hour；The gradually tripping in of second stage simulation electronic pressure gauge
The deep of well, temperature are gradually increased to 100-150 DEG C of reservoir temperature, and pressure is gradually increasing and is maintained at reservoir pressure 50-70MPa,
Entire temperature-rise period continues 4 hours；Phase III simulates oil reservoir pressure oscillation, first holding pressure 50-70MPa, temperature 100-
150 DEG C 48 hours basicly stable, and then reduction of blood pressure in high-speed to 10MPa hereinafter, boost to 50-70MPa after 1 hour, often later again
Every 24 hours above-mentioned buck-boost processes of repetition, it is repeated 3 times altogether；Fourth stage simulation electronic pressure gauge goes out well, and it is empty to stop constant temperature
Gas experimental box heats and opens chamber door, and structure for pressure test natural cooling 1 hour simultaneously keeps pressure 10-30MPa, quickly releases pressure extremely
Atmospheric pressure.
After the experiment process, fast quick-detach decomposes structure for pressure test, removes all tested rubbers from rubber o-ring fixture
Glue O-ring was completed to take pictures to the observation of above-mentioned tested rubber o-ring and measuring external appearance size in 30 minutes.
The step of comprehensive judgement rubber o-ring high pressure resistant carbon dioxide sealing performance, is as follows:
1), during above-mentioned test after structure for pressure test high-temperature stable, the fixture inner cavity of above-mentioned electronic pressure gauge monitoring
Pressure should keep stable, if lasting rise or rise to higher pressure force value suddenly, judge that tested rubber o-ring sealing is lost
Effect, its resistance to carbon dioxide performance are unqualified；
2), the tested rubber o-ring that off-test is removed from fixture, it is wantonly 1 appearance blistering in 3 samples, breach, disconnected
It splits or swells more than 25%, then judge that the resistance to carbon dioxide performance of model whole rubber o-ring is unqualified.
Compared with the prior art, the invention has the following beneficial effects:
Invention emulates the operating conditions of carbon dioxide flooding oil reservoir well testing electronic pressure gauge rubber o-ring, detect qualified rubber
Glue O-ring resistance to carbon dioxide performance in the application of above-mentioned reality of work is stablized, it is ensured that electronic pressure gauge is in high temperature and pressure high concentration
The subsurface environment sealed reliable of carbon dioxide, can greatly improve the success rate of carbon dioxide flooding oil reservoir well testing.The process of test is adopted
With the scheme of approximate simulation carbon dioxide flooding oil reservoir well testing general process, the actual effect of test result is improved to greatest extent.
Detailed description of the invention
Fig. 1 is a kind of system connection schematic diagram of the resistance to carbon dioxide performance test of rubber seal of the invention.
Fig. 2 is a kind of structure for pressure test structural schematic diagram of the resistance to carbon dioxide performance test of rubber seal of the invention.
In figure: 1-pressure cavity shell；2-seal plugs；3-helmets；4-pressure entrances；5-pressure exports；6-is bis-
Grade spring energy-storage circle；7-groove bodies；8-cylinders；9,10-groove drum assembly；11,12,13-tested rubber o-ring；14-electricity
Sub- manometry end.
100-structure for pressure test；102-electronic pressure gauges；103-Tempeerature-constant air experimental boxs；The pressurization of 104-carbon dioxide
Pump；105-liquefied carbon dioxide steel cylinders；106-cylinder valves；107-injection valves；108-return valves；109-relief valves；
1010-pressure gauges；1011-pressure ducts；1012-computer data processors；1013-communication cables.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
Fig. 1 to Fig. 2 is please referred to, the present invention provides a kind of technical solution: a kind of resistance to carbon dioxide performance examination of rubber seal
Check system, including structure for pressure test 100, Tempeerature-constant air experimental box 103, liquefied carbon dioxide steel cylinder 105, carbon dioxide booster pump
104, the structure for pressure test is integrally placed in inside Tempeerature-constant air experimental box, and the structure for pressure test includes pressure cavity shell 1, sealing
Plug 2, groove body 7, cylinder 8, groove drum assembly 9,10, the seal plug are blocked in pressure cavity shell upper port, the sealing
Plug opens up vertical central channel, and vertical central channel upper port connects electronic pressure gauge measurement end 1014, vertical central channel
Lower port connects groove body upper port, and groove body lower end connects groove drum assembly, and wherein two to be connected in series are at least arranged in groove drum assembly
It is a, the groove drum assembly lower port connector drum upper port of bottom, the seal plug, groove body, groove drum assembly, cylinder according to
Secondary be connected to collectively forms the fixture of tested rubber o-ring, the groove body and groove drum assembly junction, groove drum assembly two-by-two it
Between junction, groove drum assembly and cylinder junction be respectively mounted tested rubber o-ring 11,12,13, the pressure cavity shell opens up
Pressure entrance 4 and pressure export 5, the pressure inlets pass through the injection valve 107 of the outlet of piping connection carbon dioxide booster pump,
The cylinder valve 106 of the import connection liquefied carbon dioxide steel cylinder outlet of carbon dioxide booster pump, the pressure inlets and cylinder valve
Between also independent one return line of connection, return valve 108 is installed on return line, the pressure export connects pressure relief pipe,
Pressure gauge 1010 and relief valve 109 are set on pressure relief pipe.Pressure cavity shell upper end outer wall, which is also installed, to be used to push down sealing
The pressure cap 3 of plug.The seal plug outer wall is connect with pressure chamber inner walls for screw thread type, and the seal plug outer wall
Twin-stage spring energy-storage circle 6 is set between pressure chamber inner walls.
Shown in Fig. 2, structure for pressure test includes rubber o-ring fixture and pressure vessel two parts.Above-mentioned rubber o-ring fixture by
Groove body 7, cylinder 8, groove drum assembly 9,10 form；Groove body 7 opens up axially extending bore, and there are connection screw thread and sealing cone in one end, separately
There is O-ring sealed groove in one end；Cylinder 8 is closed at one end, and the other end is O-ring outer barrel；Groove drum assembly 9 and 10 opens up axis
To through-hole, one end is O-ring sealed groove, and the other end is O-ring outer barrel；Above-mentioned four are linked in sequence by screw thread completes
Fixture assembling is stated, tested rubber o-ring 11,12,13 is installed in three sealed grooves and outer cylinder combination.Above-mentioned pressure vessel is by pressure
Cavity shell 1, seal plug 2, helmet 3 form, and design and bear specified internal pressure 120MPa or more, and 260 DEG C of heatproof or more, sealed pressure
Greater than 120MPa, resistance to CO2Corrosion, above-mentioned three, which is all made of high-strength stainless steel, ensures sufficient intensity through forging and stamping, modulation treatment.Pressure
Pressure entrance 4 and pressure export 5 is arranged in 1 side of power cavity shell, is tightly connected by screw thread and pressure duct.2 envelope of seal plug
Stifled pressure chamber open end, is connect, using 5 sealed pressure chamber of two-stage spring energy-storage circle with the inner wall of pressure cavity shell 1 by screw thread
The seal casinghousing of interior high pressure, above-mentioned spring energy-storage circle 5 uses 316L not using polytetrafluoroethylene PTFE addition graphite material, spring
Become rusty Steel material；Seal plug 2 is axial through-hole, and there are connection screw thread and sealing cone in through-hole both ends.Helmet 3 passes through pressure chamber shell
1 external screw-thread of body is connected thereto, and is compressed the outer of seal plug 2, is further strengthened the company of seal plug 2 Yu pressure cavity shell 1
Connect intensity.The above-mentioned fixture for installing all 3 tested rubber o-rings passes through the inside of screw thread and sealing cone and seal plug 2
It is tightly connected, above-mentioned four face closure of fixture, only upper port connect electronic pressure gauge, the axially extending bore of the sealed plug 2 in inner cavity
It is tightly connected with the measurement end 1014 of electronic pressure gauge.
For electronic pressure gauge used in carbon dioxide flooding oil reservoir well testing, added using the steel with above-mentioned pressure gauge same model
The fixture of work rubber o-ring, above-mentioned fixture use single-stage rubber o-ring sealing means, and pressure-bearing outer cylinder, O-ring groove are complete
It is processed according to the size and technical requirements of above-mentioned pressure gauge sealing position.The above-mentioned folder of tested rubber o-ring sample is installed
Tool is equipped with closing inner chamber, is placed in structure for pressure test and carries out receiving external pressure test, and temperature, pressure and the carbon dioxide of above-mentioned test are situated between
Matter concentration uses carbon dioxide flooding oil reservoir well testing upper bound condition, real by Tempeerature-constant air experimental box and carbon dioxide gas-liquid booster pump
It is existing.The inner cavity of rubber o-ring fixture and electronic pressure gauge measurement end are much higher than the metal conical surface of rubber seal using sealing performance
Sealing is compressed, the pressure of above-mentioned fixture inner cavity is tested using high-precise electronic pressure manometer, monitors rubber o-ring leakage situation, is used
To judge the resistance to carbon dioxide sealing performance of rubber o-ring.The process of test uses the oil reservoir well testing of approximate simulation carbon dioxide flooding
The scheme of general process improves the actual effect of test result to greatest extent.
Electronic pressure gauge processing and fabricating material used in carbon dioxide oil reservoir well testing is identical, the consistent rubber of sealing position
O-ring fixture chooses 3 tested rubber o-ring samples and is respectively installed to above-mentioned fixture, structure for pressure test 100 assembled, according to attached drawing
The connection of pilot system equipment is completed shown in 1, debugging computer acquisition electron pressure counts normally, with vacuum pump to structure for pressure test
And pressure duct vacuumizes, and then starts filling CO 2 and temperature-pressure operation, detailed step is as follows:
1, liquefied carbon dioxide steel cylinder 105 is horizontal positioned, and confirmation relief valve 109 is closed, and opens cylinder valve 106, injection valve
107, return valve 108, allow carbon dioxide full of structure for pressure test 100 and pipeline 1011, and 1010 indicating value of pressure gauge is stablized in liquefaction two
The pressure (being less than 10MPa) of carbonoxide steel cylinder 105, is then shut off return valve 108, starts carbon dioxide booster pump 104 to pressure testing
Carbon dioxide is pumped into tooling, pressure gauge indicating value reaches well head pressure, i.e. 10-30MPa, keeps the pressure value 1 hour；
2, injection valve 107 is closed, starting Tempeerature-constant air experimental box 103 is rapidly heated to aforementioned reservoir temperature, structure for pressure test
100 and 102 temperature of electronic pressure gauge be gradually increasing, in temperature-rise period the moment monitor pressure gauge 1010, when pressure be higher than above-mentioned oil
It is instantaneously opened and closed return valve 108 when hiding pressure, makes to keep the above-mentioned hiding pressure of oil basicly stable in structure for pressure test 103.With pressure testing work
It fills 100 to be gradually warmed up, pressure rises due to air expands for the inner cavity of internal component rubber o-ring fixture, monitors the pressure
The indicating value of electronic pressure gauge steadily rises and then tends towards stability, and the above process continues 4 hours.
3, stop carbon dioxide booster pump 104, all valves is kept to close, structure for pressure test 100 is stablized in reservoir temperature
It 100-150 DEG C and reservoir pressure 50-70MPa, maintains 48 hours.
4, cylinder valve 106 is opened, return valve 108 is opened in control makes carbon dioxide flow back into steel cylinder 105, until pressure gauge
1010 indicating values stablize the pressure (being less than 10MPa) in liquefied carbon dioxide steel cylinder 105.Closing volume valve 108 after 1 hour is opened
Injection valve 107, starting carbon dioxide booster pump 104 are pumped into carbon dioxide into structure for pressure test, and the indicating value to pressure gauge 1010 is steady
It is scheduled on reservoir pressure 50-70MPa, closes injection valve 107, stops carbon dioxide booster pump 104, structure for pressure test 100 continues to stablize
In 100-150 DEG C of reservoir temperature and reservoir pressure 50-70MPa.
5, step 4 is repeated after 24 hours, so carries out 3 circulations.
6, stop Tempeerature-constant air experimental box 103 and open its chamber door, make 100 natural cooling of structure for pressure test 1 hour, during which control
Relief valve 109 processed is bled off pressure or 104 ftercompction of carbon dioxide booster pump makes the indicating value of pressure gauge 1010 keep well head pressure 10- substantially
30MPa finally closes cylinder valve 106, standard-sized sheet relief valve 109 and quickly releases in structure for pressure test 100 pressure to atmospheric pressure.
7, structure for pressure test 100 is decomposed in disassembly in 30 minutes, the tested rubber o-ring observation of taking-up takes pictures, measures its appearance ruler
It is very little, the high pressure resistant carbon dioxide sealing performance of comprehensive judgement rubber o-ring.
The high pressure resistant carbon dioxide sealing performance of last comprehensive descision rubber o-ring, the method is as follows:
1, during above-mentioned test after structure for pressure test high-temperature stable, the fixture inner cavity of high-precise electronic pressure manometer monitoring
Pressure should keep stable, if lasting rise or rise to higher pressure force value suddenly, judge that tested rubber o-ring sealing is lost
Effect, its resistance to carbon dioxide performance are unqualified；
2, the tested rubber o-ring that off-test is removed from fixture, it is wantonly 1 appearance blistering in 3 samples, breach, disconnected
It splits or swells more than 25%, then judge that the resistance to carbon dioxide performance of model whole rubber o-ring is unqualified.
It should be noted that Tempeerature-constant air experimental box 103, liquefied carbon dioxide steel cylinder 105, carbon dioxide booster pump 104,
Electronic pressure gauge 102 and the computer data processor 1012 being connected by communication cable 1013 with electronic pressure gauge belong to
Existing conventional techniques do not belong to product of the present invention necessity component, directly apply in test method use process, no longer superfluous
It states.
In the description of the present invention, it is to be understood that, temporald eixis or positional relationship are orientation based on the figure
Or positional relationship, it is merely for convenience of the description present invention, rather than the device or element of indication or suggestion meaning there must be spy
Fixed orientation is constructed and operated in a specific orientation, therefore is not considered as limiting the invention.
It although an embodiment of the present invention has been shown and described, for the ordinary skill in the art, can be with
A variety of variations, modification, replacement can be carried out to these embodiments without departing from the principles and spirit of the present invention by understanding
And modification, the scope of the present invention is defined by the appended.
Claims (5)
1. a kind of rubber seal method for testing performance of resistance to carbon dioxide, which is characterized in that first, utilize rubber o-ring fixture
The test tool constituted with pressure vessel, the actual working state of the unilateral pressure-bearing of sealing ring used in simulation electronic pressure gauge；The
Two, simulate temperature, pressure, the upper limit operation environmental condition of medium in above-mentioned sealing ring practical application, including electronic pressure gauge
Enter well, gradually lower depth, pressure oscillation, the experiment process for going out well four-stage；Third measures the leakage pressure of tested rubber o-ring
Power, the physical appearance after observing tested rubber o-ring test, sentences according to above-mentioned leak pressure situation and physical appearance characteristic synthetic
The high pressure resistant CO of disconnected rubber o-ring2Sealing performance.
2. a kind of rubber seal method for testing performance of resistance to carbon dioxide according to claim 1, which is characterized in that described
Structure for pressure test includes rubber o-ring fixture and pressure vessel two parts；The rubber o-ring fixture uses single-stage rubber o-ring
Sealing means are processed using with the steel for being adapted to electronic pressure gauge same model, rubber o-ring fixture itself and itself is all
The size and technical parameter constructed fully according to adaptation electronic pressure gauge sealing position is processed；The rubber o-ring fixture
Including groove body, cylinder, groove drum assembly, three's sequence is linked in sequence by screw thread, and groove drum assembly is quantitatively at least arranged
Mutually two of concatenation；Bottom end is cylinder, and the lower end closed of cylinder, upper end are O-ring outer cylinder；Centre connects two groove drum combinations
Body, groove drum assembly axially extending bore, lower end are O-ring sealed groove, and upper end is O-ring outer cylinder；Top is groove body, and groove body is axial
Through-hole, lower end are O-ring sealed groove, and there are connection screw thread and sealing cone in upper end；The O-ring sealed groove is respectively mounted tested
Rubber o-ring；The pressure vessel includes pressure cavity shell, seal plug, pressure cap, and the seal plug is blocked in pressure chamber shell
Body upper port, the seal plug outer wall and pressure chamber inner walls are that screw thread type connect, and the seal plug outer wall and
Twin-stage spring energy-storage circle is arranged between pressure chamber inner walls to seal, pressure cavity shell upper end outer wall, which is also installed, to be used to push down
The pressure cap of seal plug, pressure vessel filling carbon dioxide sealed pressure not less than 120MPa, 260 DEG C of heatproof or more, it is resistance to
Carbon dioxide corrosion, the seal plug open up vertical central channel, and vertical central channel upper port connects electron pressure measurement
End is measured, vertical central channel lower port is tightly connected groove body upper port by screw thread and sealing cone；The tested rubber o-ring
The atmospheric air of the inner cavity of Compressed CO_2 medium in one-side contact pressure vessel, the other side and the rubber o-ring fixture connects
It is logical.
3. a kind of rubber seal method for testing performance of resistance to carbon dioxide according to claim 1 or 2, which is characterized in that
The experiment process is divided into 4 stages, and first stage simulation electronic pressure gauge enters well head, and pressure is increased to well head pressure from normal pressure
Power 10-30MPa, temperature keep room temperature, and the time continues 1 hour；The deep of second stage simulation electronic pressure gauge gradually lower going-into-well,
Temperature is gradually increased to 100-150 DEG C of reservoir temperature, and pressure is gradually increasing and is maintained at reservoir pressure 50-70MPa, entirely heats up
Cheng Chixu 4 hours；Phase III simulates oil reservoir pressure oscillation, and holding pressure 50-70MPa, 100-150 DEG C of temperature are substantially steady first
48 hours fixed, then reduction of blood pressure in high-speed to 10MPa hereinafter, boost to 50-70MPa, later every repetition in 24 hours again after 1 hour
Above-mentioned buck-boost process, is repeated 3 times altogether；Fourth stage simulation electronic pressure gauge goes out well, stops the heating of Tempeerature-constant air experimental box
And chamber door is opened, structure for pressure test natural cooling 1 hour simultaneously keeps pressure 10-30MPa, pressure of quickly releasing to atmospheric pressure.
4. a kind of rubber seal method for testing performance of resistance to carbon dioxide according to claim 3, which is characterized in that described
After experiment process, fast quick-detach decomposes structure for pressure test, all tested rubber o-rings is removed from rubber o-ring fixture, 30
Minute interior completion is taken pictures to the observation of above-mentioned tested rubber o-ring and measuring external appearance size.
5. a kind of rubber seal method for testing performance of resistance to carbon dioxide according to claim 4, which is characterized in that comprehensive
The step of determining rubber o-ring high pressure resistant carbon dioxide sealing performance is as follows:
1), during above-mentioned test after structure for pressure test high-temperature stable, the fixture inner cavity pressure of above-mentioned electronic pressure gauge monitoring
Should keep stable, if lasting rise or rise to higher pressure force value suddenly, judge tested rubber o-ring seal failure, its
Resistance to carbon dioxide performance is unqualified；
2), the tested rubber o-ring that off-test is removed from fixture, wantonly 1 appearance blistering in 3 samples, breach, fracture or
It swells more than 25%, then judges that the resistance to carbon dioxide performance of model whole rubber o-ring is unqualified.
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| CN112229580A (en) * | 2020-10-14 | 2021-01-15 | 山东聊城富锋汽车部件有限公司 | Method for detecting tightness of nylon retainer ring |
| CN112240893A (en) * | 2019-07-16 | 2021-01-19 | 中国石油天然气股份有限公司 | Experimental device and method for statically evaluating temperature resistance of foaming agent |
| CN114544375A (en) * | 2022-03-07 | 2022-05-27 | 美思流体动力科技(哈尔滨)有限公司 | O-shaped ring hydrostatic test device for nuclear main pump |
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