CN104020279A - Aging test method for simulating packer rubber sleeve under actual working conditions - Google Patents

Aging test method for simulating packer rubber sleeve under actual working conditions Download PDF

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Publication number
CN104020279A
CN104020279A CN201410277741.4A CN201410277741A CN104020279A CN 104020279 A CN104020279 A CN 104020279A CN 201410277741 A CN201410277741 A CN 201410277741A CN 104020279 A CN104020279 A CN 104020279A
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China
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aging
plate
sample
days
base plate
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CN201410277741.4A
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Chinese (zh)
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CN104020279B (en
Inventor
胡松青
廉兵杰
王志坤
吕强
张田田
陈生辉
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中国石油大学(华东)
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Abstract

The invention discloses an aging test method for simulating a packer rubber sleeve under actual working conditions. The aging test method comprises the steps of machining hydrogenated nitrile rubber to be a rubber sample with certain size, applying stress to the sample, soaking the sample in a liquid aging medium, controlling the aging temperature, and performing an aging test with different days, so that the analysis on mechanical property and research on service life of the rubber sample are carried out. According to the aging test method, an aging test result similarly speculating rubber in actual environment can be simulated and accelerated in a lab; the remarkable aging acceleration is provided while the simulation and the reproducibility are ensured, and the acceleration can be up to tens of times; the aging test method can be applied to research on aging activity and rule of the packer rubber under actual working conditions, and also can be applied to the aging performance research of other types of rubber under corresponding environment.

Description

The aging testing method of simulation packing element under actual working conditions

Technical field

The invention belongs to packing element Aging simulation technical field, be specifically related to a kind of aging testing method of packing element under actual working conditions of simulating.

Background technology

Elastomeric material and goods thereof, due to the performance of its uniqueness, excellence, have been widely used in a plurality of fields such as oil, building, automobile, space flight.Wel packing is one of important tool of borehole operation in petroleum exploration and development process, packer widespread use in the production practices in each oil field, and its seal element---packing element, is the core component of packer.Harsh yet the applying working condition of packing element is complicated: high temperature, high pressure, in corrosive medium are also subject to the erosion of sulfuretted hydrogen, acid etc. simultaneously.Under this environment, can there is swelling, the phenomenon such as aging in packing element elastomeric material, and its performance can decline gradually along with the increase of time, even loses usability, causes sealing unsuccessfully.

Adopting experimental technique to carry out the research of packing element ageing of rubber can clear and definite packing element ageing of rubber rule and agine mechaism, and can predict its serviceable life.The aging common needs time of several years of rubber under natural conditions, therefore utilize quick aging method to become a kind of practical ways to carry out the aging research of elastomeric material.Conventional accelerated deterioration has the test methods such as hot-air accelerated deterioration, oxygen bomb accelerated deterioration, artificial climate accelerated deterioration, hydrothermal aging, ozone accelerated deterioration, smog corrosion.

The current conventional ageing of rubber experimental technique part that comes with some shortcomings: one, some special rubber, as packing element rubber in use can be subject to larger effect of stress, and rarely has report about the ageing of rubber experiment under stress condition.Its two, packing element actual condition temperature of living in can reach 150 ℃, and in liquid medium, and common ageing of rubber experimental technique is difficult to realize aging in liquid medium of rubber under hot conditions.

Summary of the invention

In order to solve the defect existing in prior art, the present invention proposes a kind of aging testing method of packing element under actual working conditions of simulating, the method can be used for the ageing properties under high temperature, stress and liquid aging medium condition to packing element rubber to be evaluated, and the method has simulation and reappearance.

Technical solution of the present invention comprises:

Simulate the aging testing method of packing element under actual working conditions, comprise the following steps successively:

A chooses packing element hydrogenation nitrile rubber material used, and is processed into columniform rubbery sample;

B ready reaction device, described reaction unit comprises reactor and compression clamp, described reactor comprises kettle and for sealing the lid of kettle, described compression clamp comprises base plate and is positioned at described base plate top the upper plate parallel with described base plate, the edge on described base plate and upper plate both sides is provided with for limiting the bolt of described base plate and upper plate, and the top of described bolt screws with nut; Between described base plate and upper plate, be provided with stop, described stop is fastened on the screw rod of described bolt;

C is put in described rubbery sample between above-mentioned base plate and upper plate, then puts into described stop and sets compression height, compressing rubber sample, get a certain amount of liquid aging medium, add in above-mentioned kettle, the rubbery sample after compression is immersed in described aging medium to capping still;

D meets step c, reactor is put into constant temperature senile experiment case and heat, and carries out at a certain temperature senile experiment, and digestion time is set as respectively 2 days, 4 days, 7 days, 14 days, 30 days, 45 days, 60 days, 75 days, 90 days;

E connects steps d, and taking-up sample after aging completing is placed under free state 30 minutes, measures sample and recovers height, deployable to the rubbery sample compression set mechanics property analysis after aging under different time and condition of different temperatures.

Further, in step b, between the base plate of described compression clamp and upper plate, be provided with several pressing plates, every two adjacent pressing plates be arranged in parallel, between described each pressing plate and upper plate, base plate, be provided with stop, described bolt is the perpendicular edge that is through at described upper plate, each pressing plate and base plate successively.

Further, in step a, above-mentioned rubbery sample is of a size of Φ 29 * 12.5mm.

Further, the deflection of above-mentioned rubbery sample is 25%.

Further, in steps d, temperature is 160 ℃~200 ℃.

Further, in step b, the inflow point of above-mentioned kettle is provided with flange, lays one deck stainless steel O-ring seal between above-mentioned flange and above-mentioned lid, between above-mentioned flange and lid, is bolted.

The useful technique effect that the present invention brings:

The present invention proposes a kind of aging testing method of packing element under actual working conditions of simulating, it is processed as hydrogenation nitrile rubber the rubbery sample of certain size, then to this rubbery sample stress application, and be immersed in liquid aging medium, because material selected in packing element is generally hydrogenation nitrile rubber, it is processed as rubbery sample by hydrogenation nitrile rubber and has more simulation, what aging medium of the present invention was selected is Oil Field water sample, control aging temperature, carry out the senile experiment of different number of days, be the deployable research to rubbery sample mechanics property analysis and serviceable life, can be similar to and infer the senile experiment result of rubber actual environment from laboratory simulation accelerated test result, aging testing method of the present invention is guaranteeing simulation and is reproduciblely having a significant accelerated deterioration simultaneously, can reach decades of times.

The present invention to sample stress application, can simulate the actual mechanics working condition that packing element is aging by compression clamp; By sealed reactor, can make in kettle to keep larger pressure, make the rubbery sample can be under higher temperature, for example 150 ℃ above still can be aging for a long time in liquid aging medium, simulate more really the residing ageing environment of packing element rubber.

The inventive method can be applicable to study rubbery sample under its actual work condition environment condition aging behavior and rule, can also be applied to the aging research of other types rubber under respective environment.

Accompanying drawing explanation

Below in conjunction with accompanying drawing, the present invention is done to further clear, complete explanation:

Fig. 1 is the vertical view of lid of the present invention;

Fig. 2 is the sectional view of ageing test apparatus of the present invention;

Fig. 3 be the embodiment of the present invention 1 rubbery sample in oilfield sewage aging medium 160 ℃ of lower compression permanent strains the change curve with digestion time;

Fig. 4 be the embodiment of the present invention 2 rubbery samples in oilfield sewage aging medium 180 ℃ of lower compression permanent strains the change curve with digestion time;

Fig. 5 be the embodiment of the present invention 3 rubbery samples in oilfield sewage aging medium 200 ℃ of lower compression permanent strains the change curve with digestion time;

In figure, 1, fastening bolt, 2, flange, 3, kettle, 4, nut, 5, rubbery sample, 6, bolt, 7, stainless steel O-ring seal, 8, liquid aging medium, 9, stop, 10, pressing plate.

Embodiment

The invention discloses a kind of aging testing method of packing element under actual working conditions of simulating, in order to make advantage of the present invention, technical scheme clearer and more definite, below in conjunction with specific embodiment, the present invention is done to further clear, complete explanation.

Selected portion raw material of the present invention is done to following explanation below:

The selected liquid aging medium of the present invention is the Oil Field water sample of selecting; It is made packing element by hydrogenation nitrile rubber, to after rubber sulfuration, with finishing, become cylindrical sample as rubbery sample of the present invention, the equal preferred size of following examples of the present invention is Φ 29mm * 12.5mm, and the rubbery sample processing is put into the rubber compression set stress application shown in Fig. 2.

Below the structure of ageing of rubber device of the present invention and method of work thereof are explained as follows:

In Fig. 2, column type sample is placed between four pressing plates 10, by stop 9, determine the height between every two plates, the nut 4 by 6 tops that tight a bolt carrys out compressing rubber sample, makes it reach the height that stop 9 limits.

In reactor kettle 3, add ageing of rubber liquid aging medium 8 used, compression clamp is immersed in the middle of aged solution, the lid of reactor with on kettle 3 flanges 2, by ten circumferential equally distributed fastening bolts 1, be connected, in the middle of two flanges 2, accompany stainless steel O-ring seal 7, symmetry is tightened ten bolts, makes reactor sealing.

Reactor is put into ageing oven, aging temperature is made as 160 ℃~200 ℃, carry out the aging test of 2~90 day time, can analyze the ageing properties parameters such as compression set of rubbery sample after aging different temperatures, different time, the computing method of compression set are calculated according to formula (1):

ϵ ( % ) = h 0 - h 1 h 0 - h s × 100 % - - - ( 1 )

In formula (1): the compression set of ε-rubber, %; h 0the former height of-rubbery sample, mm; h 1height after-sample recovers, mm; h sthe height of-limiter, mm.

Embodiment 1:

The present invention, a kind of aging testing method of packing element under actual working conditions of simulating, specifically comprises the following steps:

Step 1, choose hydrogenation nitrile rubber material, and be processed into columniform rubbery sample, the preferred sample of the present invention is of a size of Φ 29 * 12.5mm;

Step 2, ready reaction device, the selected reaction unit of the present invention comprises reactor and compression clamp, specifically in conjunction with shown in Fig. 1, Fig. 2, a kind of ageing test apparatus of packing element under actual working conditions of simulating, it comprises reactor and rubber compression clamp, reactor comprises kettle 3 and for sealing the lid of kettle 3, while carrying out simulation test, compression clamp is positioned in kettle 3, by adding aging medium to simulate in kettle 3;

Compression clamp is for rubbery sample 5 stress applications, and it mainly comprises base plate and be positioned at above base plate and the upper plate parallel with base plate, and the edge on base plate and upper plate both sides is provided with for limiting the bolt of base plate and upper plate, at the top of bolt, with nut 4, screws; Preferably between the base plate of compression clamp and upper plate, be provided with several pressing plates 10, every two adjacent pressing plates be arranged in parallel, the perpendicular perpendicular edge that is through at upper plate, each pressing plate and base plate successively of screw rod of above-mentioned bolt, bolt can reach upper plate, each pressing plate and base plate are carried out to spacing object, between above-mentioned each pressing plate and upper plate, base plate, be provided with stop, between base plate and upper plate, be provided with stop, stop is semilune, and the screw rod of Qi Yu edge bolt is fastened on together; Rubbery sample 5 is placed near stop 9;

The inflow point of kettle 3 is provided with flange 2, lays one deck stainless steel O-ring seal 7 between flange 2 and lid, between flange 2 and lid, by fastening bolt 1, connects, and between preferred above-mentioned flange and lid, by least 8 bolts, connects;

Step 3, rubbery sample 5 is put near above-mentioned stop, adjust stop height and reach rubber requirement compression height, fastening nut compressing rubber sample, sample deformation amount is 25%, then get a certain amount of liquid aging medium, add above-mentioned kettle, the compression clamp with rubbery sample is immersed in described aging medium, tighten the nut capping still on lid;

Step 4, connect step 3, reactor is put into constant temperature senile experiment case and heat, be heated to 160 ℃ and carry out senile experiment, digestion time is set as respectively 2 days, 4 days, 7 days, 14 days, 30 days, 45 days, 60 days, 75 days, 90 days;

Step 5, connect step 4, after aging different number of days, take out sample, under free state, place 30min, measure sample and recover height (h 1), can pass through formula (1) and calculate the compression set of rubbery sample after 160 ℃ of aging different times.As shown in Figure 3, as can be seen from the figure, at this temperature, hydrogenation nitrile rubber ε value increases along with the prolongation of digestion time in the compression set calculating.

Embodiment 2:

Difference from Example 1 is: in step 4, the aging temperature of hydrogenation nitrile rubber is 180 ℃, and its compression set with the variation of digestion time as shown in Figure 4.As can be seen from the figure,, at this temperature, along with the prolongation of digestion time, the ε value of rubber increases; Comparison diagram 4 and Fig. 3 can find out, temperature rising, and the compression set of rubber increases.

Embodiment 3:

Difference from Example 1 is: in step 4, the aging temperature of hydrogenation nitrile rubber is 200 ℃, and its compression set with the variation of digestion time as shown in Figure 5.As can be seen from the figure,, at this temperature, along with the prolongation of digestion time, the ε value of rubber increases; Comparison diagram 5 and Fig. 4, Fig. 3 can find out, hydrogenation nitrile rubber ε value increases along with the rising of temperature.

Aging under actual working conditions of lab simulation rubbery sample of the present invention, can study ageing properties and the aging rule of packing element elastomeric material under high temperature, stress and aqueous medium condition, and revision test proof has good repeatability.

Claims (6)

1. simulate the aging testing method of packing element under actual working conditions, it is characterized in that, comprise the following steps successively:
A chooses packing element hydrogenation nitrile rubber material used, and is processed into columniform rubbery sample;
B ready reaction device, described reaction unit comprises reactor and compression clamp, described reactor comprises kettle and for sealing the lid of kettle, described compression clamp comprises base plate and is positioned at described base plate top the upper plate parallel with described base plate, the edge on described base plate and upper plate both sides is provided with for limiting the bolt of described base plate and upper plate, and the top of described bolt screws with nut; Between described base plate and upper plate, be provided with stop, described stop is fastened on the screw rod of described bolt;
C is put in described rubbery sample between above-mentioned base plate and upper plate, then puts into described stop and sets compression height, compressing rubber sample, get a certain amount of liquid aging medium, add in above-mentioned kettle, the rubbery sample after compression is immersed in described aging medium to capping still;
D meets step c, reactor is put into constant temperature senile experiment case and heat, and carries out at a certain temperature senile experiment, and digestion time is set as respectively 2 days, 4 days, 7 days, 14 days, 30 days, 45 days, 60 days, 75 days, 90 days;
E connects steps d, and taking-up sample after aging completing is placed under free state 30 minutes, measures sample and recovers height, deployable to the rubbery sample compression set mechanics property analysis after aging under different time and condition of different temperatures.
2. aging testing method according to claim 1, it is characterized in that: in step b, between the base plate of described compression clamp and upper plate, be provided with several pressing plates, every two adjacent pressing plates be arranged in parallel, between described each pressing plate and upper plate, base plate, be provided with stop, described bolt is the perpendicular edge that is through at described upper plate, each pressing plate and base plate successively.
3. aging testing method according to claim 1, is characterized in that: in step a, described rubbery sample is of a size of Φ 29 * 12.5mm.
4. according to the aging testing method described in claim 2 or 3, it is characterized in that: the deflection of described rubbery sample is 25%.
5. aging testing method according to claim 4, is characterized in that: in steps d, temperature is 160 ℃~200 ℃.
6. aging testing method according to claim 5, it is characterized in that: in step b, the inflow point of described kettle is provided with flange, lays one deck stainless steel O-ring seal between described flange and described lid, between described flange and lid, is bolted.
CN201410277741.4A 2014-06-20 2014-06-20 The aging testing method of simulation packing element under actual working conditions CN104020279B (en)

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105628598A (en) * 2015-12-23 2016-06-01 中国人民解放军海军航空工程学院 Aging testing method for simulating practical operation environment of rubber sealing ring
CN105973790A (en) * 2016-04-29 2016-09-28 洪亮 Test method for simulating ageing of O-shaped rubber sealing ring in marine environment
CN106124292A (en) * 2016-06-15 2016-11-16 北京航空航天大学 A kind of method of O shape rubber parts store failure mechanism
CN105784582B (en) * 2016-05-12 2019-04-09 山东玲珑轮胎股份有限公司 A kind of sizing material environmental aging analog detection method

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Publication number Priority date Publication date Assignee Title
CN201372765Y (en) * 2009-01-07 2009-12-30 中国石油大学(北京) Testing device of rubber cylinder of packer
CN102879321A (en) * 2012-10-22 2013-01-16 西南石油大学 Method for simulating high-temperature and high-pressure down-hole packer rubber corrosion test

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Publication number Priority date Publication date Assignee Title
CN201372765Y (en) * 2009-01-07 2009-12-30 中国石油大学(北京) Testing device of rubber cylinder of packer
CN102879321A (en) * 2012-10-22 2013-01-16 西南石油大学 Method for simulating high-temperature and high-pressure down-hole packer rubber corrosion test

Non-Patent Citations (1)

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Title
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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105628598A (en) * 2015-12-23 2016-06-01 中国人民解放军海军航空工程学院 Aging testing method for simulating practical operation environment of rubber sealing ring
CN105973790A (en) * 2016-04-29 2016-09-28 洪亮 Test method for simulating ageing of O-shaped rubber sealing ring in marine environment
CN105784582B (en) * 2016-05-12 2019-04-09 山东玲珑轮胎股份有限公司 A kind of sizing material environmental aging analog detection method
CN106124292A (en) * 2016-06-15 2016-11-16 北京航空航天大学 A kind of method of O shape rubber parts store failure mechanism
CN106124292B (en) * 2016-06-15 2018-10-02 北京航空航天大学 A kind of method of O shapes rubber parts store failure mechanism

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