CN104020279B - The aging testing method of simulation packing element under actual working conditions - Google Patents

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

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CN104020279B
CN104020279B CN201410277741.4A CN201410277741A CN104020279B CN 104020279 B CN104020279 B CN 104020279B CN 201410277741 A CN201410277741 A CN 201410277741A CN 104020279 B CN104020279 B CN 104020279B
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China
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aging
plate
days
sample
base plate
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CN201410277741.4A
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Chinese (zh)
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CN104020279A (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 and a kind ofly simulate the aging testing method of packing element under actual working conditions, hydrogenation nitrile rubber is processed as the rubbery sample of certain size by it, then stress is applied to this sample, and be immersed in liquor aging medium, control aging temperature, carry out the senile experiment of different number of days, namely launch the research to rubbery sample mechanics property analysis and serviceable life.Test method of the present invention can be similar to from laboratory simulation accelerated test result infers the senile experiment result of rubber actual environment, aging testing method of the present invention is at guarantee simulation and reproduciblely have significant accelerated deterioration simultaneously, decades of times can be reached, it can be applicable to study aging rice seed under its actual work condition environment condition of packing element rubber and rule, can also be applied to the aging research of other types rubber under respective 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 ofly simulate the aging testing method of packing element under actual working conditions.

Background technology

Elastomeric material and goods thereof, due to its unique, excellent performance, have been widely used in multiple 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.But the applying working condition of packing element is complicated and harsh: high temperature, high pressure, be in corrosive medium, be also subject to the erosion of sulfuretted hydrogen, acid etc. simultaneously.In such a case, can there is the phenomenons such as swelling, aging in packing element elastomeric material, and its performance can decline gradually along with the increase of time, even loses usability, causes sealing unsuccessfully.

Adopt experimental technique to carry out the research of packing element ageing of rubber and can specify packing element ageing of rubber rule and agine mechaism, and its serviceable life can be predicted.Under natural conditions, the aging usual needs time of several years of rubber, therefore utilizes quick aging method to become a kind of practical ways with the aging research of carrying out 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.

At present conventional ageing of rubber experimental technique comes with some shortcomings part: 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, residing for packing element, actual condition temperature can reach 150 DEG C, and is 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

The present invention proposes a kind ofly simulate the aging testing method of packing element under actual working conditions to solve the defect existed in prior art, the method can be used for evaluating the ageing properties of packing element rubber under high temperature, stress and liquor aging ambient condition, 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 the lid for sealing kettle, described compression clamp comprises base plate and is positioned at upper plate above described base plate and parallel with described base plate, the edge on described base plate and upper plate both sides is provided with the bolt for limiting described base plate and upper plate, the top nut of described bolt; Be provided with stop between described base plate and upper plate, described stop is fastened on the screw rod of described bolt;

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

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

E connects steps d, aging complete after taking-up sample, place 30 points under free state, measure sample and recover height, namely deployable to the rubbery sample compression set mechanics property analysis after aging under different time and condition of different temperatures.

Further, in step b, several pressing plates are provided with between the base plate of described compression clamp and upper plate, every two adjacent pressing plates be arranged in parallel, be provided with stop between described each pressing plate and upper plate, base plate, described bolt is the perpendicular edge being 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 DEG C ~ 200 DEG C.

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

The Advantageous Effects that the present invention brings:

The present invention proposes and a kind ofly simulate the aging testing method of packing element under actual working conditions, hydrogenation nitrile rubber is processed as the rubbery sample of certain size by it, then stress is applied to this rubbery sample, and be immersed in liquor aging medium, because material selected in packing element is generally hydrogenation nitrile rubber, hydrogenation nitrile rubber is processed as rubbery sample and has more simulation by it, 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, namely deployable to rubbery sample mechanics property analysis and the research in serviceable life, can be similar to from laboratory simulation accelerated test result and infer the senile experiment result of rubber actual environment, aging testing method of the present invention is at guarantee simulation and reproduciblely have significant accelerated deterioration simultaneously, decades of times can be reached.

The present invention applies stress by compression clamp to sample, can simulate the actual mechanics working condition that packing element is aging; Can make to keep larger pressure in kettle by sealed reactor, make rubbery sample can at relatively high temperatures, such as more than 150 DEG C still can be aging for a long time in liquor aging medium, simulates the ageing environment residing for packing element rubber more really.

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

Accompanying drawing explanation

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

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 at 160 DEG C compression set with the change curve of digestion time;

Fig. 4 be the embodiment of the present invention 2 rubbery sample in oilfield sewage aging medium at 180 DEG C compression set with the change curve of digestion time;

Fig. 5 be the embodiment of the present invention 3 rubbery sample in oilfield sewage aging medium at 200 DEG C compression set with the change curve of 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, liquor aging medium, 9, stop, 10, pressing plate.

Embodiment

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

Following explanation is done to selected portion raw material of the present invention below:

Liquor aging medium selected by the present invention is the Oil Field water sample selected; Packing element its be made by hydrogenation nitrile rubber, become cylindrical sample as rubbery sample of the present invention using after rubber sulfuration with finishing, the equal preferred size of following examples of the present invention is Φ 29mm × 12.5mm, the rubbery sample processed is put into the rubber compression set shown in Fig. 2 and applies stress.

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, determines the height between every two plates by stop 9, carry out compressing rubber sample by the nut 4 at 6 tops that tight a bolt, the height making it reach stop 9 to limit.

Ageing of rubber liquor aging medium 8 used is added in reactor kettle 3, compression clamp is immersed in the middle of aged solution, the lid of reactor is connected by ten equally distributed fastening bolts 1 of circumference with on kettle 3 flange 2, stainless steel O-ring seal 7 is accompanied in the middle of two flanges 2, symmetry tightens ten bolts, and reactor is sealed.

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

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

In formula (1): ε-rubber compression set, %; 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 ofly simulates the aging testing method of packing element under actual working conditions, 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, reaction unit selected by the present invention comprises reactor and compression clamp, shown in concrete composition graphs 1, Fig. 2, a kind ofly simulate the ageing test apparatus of packing element under actual working conditions, it comprises reactor and rubber compression clamp, reactor comprises kettle 3 and the lid for sealing kettle 3, is positioned in kettle 3 when carrying out simulation test by compression clamp, by adding aging medium to simulate in kettle 3;

Compression clamp is used for rubbery sample 5 and applies stress, and it mainly comprises base plate and is positioned at upper plate above base plate and parallel with base plate, the edge on base plate and upper plate both sides being provided with the bolt for limiting base plate and upper plate, screwing at the top nut 4 of bolt; Preferably between the base plate and upper plate of compression clamp, be provided with several pressing plates 10, every two adjacent pressing plates be arranged in parallel, the screw rod of above-mentioned bolt erects the perpendicular edge being through at upper plate, each pressing plate and base plate successively, bolt can reach and carry out spacing object to upper plate, each pressing plate and base plate, stop is provided with between above-mentioned each pressing plate and upper plate, base plate, between base plate and upper plate, be provided with stop, stop is semilune, together with it is fastened on the screw rod of edge bolt; 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, connected between flange 2 and lid by fastening bolt 1 between flange 2 and lid, is connected between preferred above-mentioned flange and lid by least 8 bolts;

Step 3, rubbery sample 5 is put near above-mentioned stop, adjustment stop height reaches rubber requirement compression height, fastening nut compressing rubber sample, sample deformation amount is 25%, then a certain amount of liquor aging medium is got, 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 DEG C and carry out senile experiment, digestion time is set as 2 days, 4 days, 7 days, 14 days, 30 days, 45 days, 60 days, 75 days, 90 days respectively;

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

Embodiment 2:

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

Embodiment 3:

Difference from Example 1 is: in step 4, and the aging temperature of hydrogenation nitrile rubber is 200 DEG C, its compression set with digestion time change as shown in Figure 5.As can be seen from the figure, at such a 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 the ageing properties of packing element elastomeric material under high temperature, stress and aqueous medium condition and aging rule, revision test proves to have good repeatability.

Claims (5)

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 the lid for sealing kettle, described compression clamp comprises base plate and is positioned at upper plate above described base plate and parallel with described base plate, the edge on described base plate and upper plate both sides is provided with the bolt for limiting described base plate and upper plate, the top nut of described bolt; Stop is provided with between described base plate and upper plate, described stop is fastened on the screw rod of described bolt, several pressing plates are provided with between the base plate of described compression clamp and upper plate, every two adjacent pressing plates be arranged in parallel, be provided with stop between described each pressing plate and upper plate, base plate, described bolt is the perpendicular edge being through at described upper plate, each pressing plate and base plate successively;
Described rubbery sample is put in base plate and pressing plate, pressing plate and pressing plate, region between pressing plate and upper plate by c, then described stop setting compression height is put in each region, compressing rubber sample, get a certain amount of liquor aging medium, add in above-mentioned kettle, rubbery sample after compression is immersed in described aging medium, capping still;
D meets step c, and reactor is put into constant temperature senile experiment case and heat, carry out senile experiment at a certain temperature, digestion time is set as 2 days, 4 days, 7 days, 14 days, 30 days, 45 days, 60 days, 75 days, 90 days respectively;
E connects steps d, aging complete after taking-up sample, place 30 minutes under free state, measure sample and recover height, namely 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, is characterized in that: in step a, described rubbery sample is of a size of Φ 29 × 12.5mm.
3. aging testing method according to claim 1 and 2, is characterized in that: the deflection of described rubbery sample is 25%.
4. aging testing method according to claim 3, is characterized in that: in steps d, temperature is 160 DEG C ~ 200 DEG C.
5. aging testing method according to claim 4, 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, be bolted between described flange and lid between described flange and described lid.
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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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
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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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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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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