CN202433287U - Crevice corrosion simulation testing device for nipples of oil well pipe - Google Patents
Crevice corrosion simulation testing device for nipples of oil well pipe Download PDFInfo
- Publication number
- CN202433287U CN202433287U CN2011205568766U CN201120556876U CN202433287U CN 202433287 U CN202433287 U CN 202433287U CN 2011205568766 U CN2011205568766 U CN 2011205568766U CN 201120556876 U CN201120556876 U CN 201120556876U CN 202433287 U CN202433287 U CN 202433287U
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- oil well
- well pipe
- joint
- pressing plate
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Abstract
The utility model discloses a crevice corrosion simulation testing device for nipples of an oil well pipe. The device comprises a first test specimen, two second test specimens, two insulated press plates, two insulated screws and two bolts. The first test specimen taken from the oil well pipe is in a rectangular sheet shape, and a through hole is arranged at each end of the first test specimen in the thickness direction; each of the two second test specimens is in a cylindrical shape and each radial cross section is a ring, and the two second test specimens are arranged on two sides of and closely attached to the first test specimen in the thickness direction; the two insulated press plates are correspondingly arranged on the outer sides of the two second test specimens, each press plate is provided with a central screw hole, and bolt holes corresponding to the through holes are arranged at two ends of each press plate; the two insulated screws are correspondingly connected with the central screw holes, and round heads of the screws abut against the two second test specimens respectively; and the two bolts correspondingly penetrate into the through holes and the bolt holes on the same side, each end of the bolts is in a threaded connection with a nut, and the nuts are arranged on the outer sides of the press plates.
Description
Technical field
The utility model relates to a kind of test unit, relates in particular to a kind of corrosion simulated test unit.
Background technology
Crevice corrosion be occur in metal and metal or metal and nonmetal between a kind of local corrosion form at place, slit, it is under the electrolyte existence condition, owing to media migration in the slit is blocked and produced.In oil-gas mining; Between oil pipe and the oil pipe or carry out direct-connected the connection; Or connect through box cupling; Between the tube and tube or the joint area between pipe and the box cupling form very little slit inevitably, generation crevice corrosion easily when the corrosive liquids in the pipe gets into these slits.Therefore crevice corrosion is a kind of common corrosion that causes the oil well pipe thread joint fails.In addition, some box cupling also can carry out surface treatments such as copper facing in order to prevent thread gluing, thereby forms the dissimilar metal contact, at this moment not only exists crevice corrosion also bimetallic corrosion can take place.About the crevice corrosion behavior evaluation method; The world and national standard have been formed at present; Like ASTM G48-03 and GB/T 10127; The crevice corrosion test method has been done specified in more detail: test adopts two teflon poles that stainless steel sheet sample holder is fixed in the centre and with rubber o-ring, immerses certain density FeCl
3With the HCl mixed solution, evaluate according to the weightlessness of sample, position, slit corrosion depth, pitting penetration etc. behind the certain hour.Test is carried out under normal pressure, 50 ℃ of maximum temperatures.
In oil-gas mining industry, oil well pipe generally all is in the corrosivity Service Environment of HTHP, and the down-hole maximum temperature surpasses 150 ℃, and some oil gas well contains the very corrosive gas of high concentration, like H
2S and CO
2, partial pressure surpasses 10MPa sometimes, and oil well pipe also will bear the erosion of severe corrosive acidifying solution when formation downhole is carried out acidification, and also there is the situation of dissimilar metal contact in some oil well pipe joint area.Therefore; Adopt existing crevice corrosion simulation test device can't simulate the corrosion environment under the actual service condition; Also can't simulate the crevice corrosion test under the dissimilar metal coupling condition; Used specimen holder can not bear the test condition of harshness like this, can not predict and estimates the crevice corrosion behavior of material under the corrosion environment of HTHP down-hole.
Summary of the invention
The purpose of the utility model provides the corrosion simulated test unit of a kind of oil well pipe thread gap at joint, and the corrosion simulated test unit of this oil well pipe thread gap at joint can be accomplished the crevice corrosion test under following four kinds of situation:
(1) crevice corrosion test under high temperature, the high-potting condition;
(2) crevice corrosion test in the acidification process;
(3) H
2S/CO
2Crevice corrosion test under the corrosive environment condition;
(4) crevice corrosion test under the different metal contact conditions.
According to above-mentioned utility model purpose, the utility model provides the corrosion simulated test unit of a kind of oil well pipe thread gap at joint, it comprises:
One takes from first sample of oil well pipe, and it is the rectangle sheet, and the two ends of said first sample respectively have a through hole on its thickness direction;
Two second samples of taking from the oil well pipe joint; It is has the cylindrical of an axial length; The radial section of said second sample is an annulus; Said second sample has an inner face and outer face on its axial direction, said two second samples are located at the both sides of first sample on thickness direction respectively, and the inner face of two second samples all fits on first sample tightly;
The pressing plate of two insulation, its corresponding respectively outside of being located at the outer face of said each second sample all has a center screw on said each pressing plate, and the two ends of said each pressing plate also respectively have a bolt hole corresponding with said through hole;
The screw of two insulation, its corresponding with each center screw respectively connection, fit the respectively outer face of each second sample of the rounded nose of said each screw with holding out against;
Two bolts, it is corresponding respectively to be arranged in through hole and the bolt hole that is positioned at homonymy, and the two ends of said bolt are connected with a nut thread respectively, and each nut is located at the outside of said pressing plate.
The concrete steps that employing present technique scheme is carried out the crevice corrosion simulation test are following:
(1) sampling: from oil well pipe cut a rectangle first sample and from the oil well pipe joint get two cylindrical, radial section is second sample of annulus;
(2) sample is loaded on the simulation test device: at first two second samples are placed the both sides of first sample on thickness direction; Then, two screws are screwed in respectively on the center screw of two pressing plates, and hold out against the outer face of two second samples respectively, make the inner face of two second samples be adjacent to the surface of first sample firmly with the rounded nose of two screws; Run through the through hole of first sample that is positioned at homonymy and the bolt hole of two pressing plates respectively with two bolts subsequently; And fix at each bolt two ends and screw with nut; Make pressing plate keep certain deformation, thereby second sample is pressed on the both sides of first sample, and then accomplish the loading of sample;
(3) experimental enviroment being set makes an experiment: the Service Environment actual according to the oil well pipe joint, and experimental enviroment is set, and will loads good sample and be placed on experimental enviroment, let it corrode regular hour;
(4) take out sample, and sample is analyzed: sample is taken out from experimental enviroment, and it is cleaned; Measure corrosion weight loss speed, the spot corrosion mean speed of first sample and second sample then, measure the darkest crevice corrosion degree of depth of first sample, thereby the crevice corrosion behavior of sample is estimated.
Preferably, in the above-mentioned corrosion simulated test unit of oil well pipe thread gap at joint, said bolt is a metal bolts; Two insulation sleeves correspondence respectively are located between two metal bolts and two through holes.The interference that test is produced in order to the crevice corrosion of avoiding between the metal bolts and first sample.
Preferably, in the above-mentioned corrosion simulated test unit of oil well pipe thread gap at joint, said pressing plate is the teflon pressing plate.
Preferably, in the above-mentioned corrosion simulated test unit of oil well pipe thread gap at joint, said screw is the teflon screw.
The corrosion simulated test unit of the described oil well pipe thread gap at joint of the utility model can the actual Service Environment of real simulated oil well pipe joint, owing to adopted high temperature resistant, resistant material, thus can carry out HTHP, strong corrosive medium, CO
2And H
2Corrosion test under S and the different metal contact concurrent conditions, and then can estimate and predict the crevice corrosion behavior of material in actual Service Environment.
Description of drawings
Fig. 1 is the structural representation of the utility model corrosion simulated test unit of described oil well pipe thread gap at joint under a kind of embodiment.
Fig. 2 is the user mode synoptic diagram of the corrosion simulated test unit of the described oil well pipe thread gap at joint of the utility model under a kind of embodiment.
Embodiment
To combine Figure of description and concrete embodiment that the corrosion simulated test unit of the described oil well pipe thread gap at joint of the utility model is done further detailed description below.
The crevice corrosion simulation test of 13Cr stainless steel oil pipe threaded connector in the medium of down-hole.
The 13Cr stainless steel oil pipe adopts box cupling to connect, and the box cupling material is identical with body, but the copper facing of box cupling inside surface, so the crevice corrosion of joint area may aggravate owing to the bimetallic corrosion effect between the different metal.Test procedure is following:
(1) sampling: process rectangle sheet first sample of 50mm * 25mm * 3mm from the 13Cr stainless steel oil pipe, the through hole of first each drill diameter 8mm of sample two ends, first specimen surface are polished to No. 600 sand paper step by step, carry out degreasing then, clean, weigh.Cylindrical with two external diameter 12mm of brass processing, internal diameter 6mm, thick 5mm, radial section be second sample of annular, surperficially polishes to No. 600 sand paper equally, carries out degreasing then, cleans, weighs.
(2) sample is loaded on the simulation test device: Fig. 1 has shown the utility model corrosion simulated test unit of described oil well pipe thread gap at joint structure in the present embodiment.As shown in Figure 1, at first two second samples 2 are placed first both sides of sample 1 on thickness direction; Then, two screws 4 are screwed in respectively on the center screw of two pressing plates 3, and hold out against the outer face of two second samples 2 respectively, make the inner face of two second samples 2 be adjacent to the surface of first sample 1 firmly with the rounded nose of two screws 4; Subsequently two insulation sleeve 6 correspondences are located in two through holes at first sample, 1 two ends; Again two bolts 5 are run through the insulation sleeve 6 of the through hole that is arranged on first sample 1 that is positioned at homonymy and the bolt hole of two pressing plates 3 respectively; And fix at each bolt 5 two ends and screw with nut 7; Make pressing plate 3 keep certain deformation, thereby second sample 2 is pressed on the both sides of first sample 1, and then accomplish the loading of sample.
(3) experimental enviroment being set makes an experiment: Fig. 2 has shown the utility model corrosion simulated test unit of described oil well pipe thread gap at joint user mode in the present embodiment.As shown in Figure 2; The simulation test device 21 that is loading sample is positioned on the support 22 in the autoclave 23; High pressure kettle cover 28 is pressed and is located on the autoclave 23; And high pressure kettle cover 28 and autoclave 23 sealings, autoclave 23 is C276 Hastelloy high temperature resistant, high corrosion with high pressure kettle cover 28 used materials.Draft tube 25, shaft 26, thermopair 27 are located on the high pressure kettle cover 28 successively, and run through high pressure kettle cover 28 and stretch to autoclave 23 inside.Etchant solution 24 is prepared according to oil gas down-hole medium composition: Cl
-: 100000ppm, HCO
3 -: 433ppm, SO
4 2+: 1300ppm, Ca
2+: 14300ppm, Na
+: bal..The liquid level of etchant solution 24 is higher than simulation test device 21 15cm at least.During test, carry out deoxygenation toward the autoclave 23 interior high pure nitrogens that feed through draft tube 25.Be heated to 150 ℃ after the deoxygenation, add CO through draft tube 25 then
2, dividing potential drop is 5.0MPa.Solution stirs through shaft 26 in the autoclave 23, the influence of the mobile butt junction position of simulative tube inner fluid crevice corrosion.Test period is 30 days.
(4) take out sample; And sample analyzed: sample is taken out from autoclave; Cleaning and removing is removed the surface corrosion product, takes pictures, and measures and calculate corrosion weight loss speed, the spot corrosion mean speed of first sample and second sample respectively; Measure the darkest crevice corrosion degree of depth of first sample, thereby the crevice corrosion behavior of sample is estimated.
Be noted that the above specific embodiment of enumerating that is merely the utility model, obviously the utility model is not limited to above embodiment, and many similar variations are arranged thereupon.If those skilled in the art from all distortion that the disclosed content of the utility model directly derives or associates, all should belong to the protection domain of the utility model.
Claims (4)
1. the corrosion simulated test unit of oil well pipe thread gap at joint is characterized in that, comprising:
One takes from first sample of oil well pipe, and it is the rectangle sheet, and the two ends of said first sample respectively have a through hole on its thickness direction;
Two second samples of taking from the oil well pipe joint; It is has the cylindrical of an axial length; The radial section of said second sample is an annulus; Said second sample has an inner face and outer face on its axial direction, said two second samples are located at the both sides of first sample on thickness direction respectively, and the inner face of two second samples all fits on first sample tightly;
The pressing plate of two insulation, its corresponding respectively outside of being located at the outer face of said each second sample all has a center screw on said each pressing plate, and the two ends of said each pressing plate also respectively have a bolt hole corresponding with said through hole;
The screw of two insulation, its corresponding with each center screw respectively connection, fit the respectively outer face of each second sample of the rounded nose of said each screw with holding out against;
Two bolts, it is corresponding respectively to be arranged in through hole and the bolt hole that is positioned at homonymy, and the two ends of said bolt are connected with a nut thread respectively, and each nut is located at the outside of said pressing plate.
2. the corrosion simulated test unit of oil well pipe thread gap at joint as claimed in claim 1 is characterized in that said bolt is a metal bolts; Two insulation sleeves correspondence respectively are located between two metal bolts and two through holes.
3. according to claim 1 or claim 2 the corrosion simulated test unit of oil well pipe thread gap at joint is characterized in that said pressing plate is the teflon pressing plate.
4. according to claim 1 or claim 2 the corrosion simulated test unit of oil well pipe thread gap at joint is characterized in that said screw is the teflon screw.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011205568766U CN202433287U (en) | 2011-12-27 | 2011-12-27 | Crevice corrosion simulation testing device for nipples of oil well pipe |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011205568766U CN202433287U (en) | 2011-12-27 | 2011-12-27 | Crevice corrosion simulation testing device for nipples of oil well pipe |
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| Publication Number | Publication Date |
|---|---|
| CN202433287U true CN202433287U (en) | 2012-09-12 |
Family
ID=46782727
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011205568766U Expired - Fee Related CN202433287U (en) | 2011-12-27 | 2011-12-27 | Crevice corrosion simulation testing device for nipples of oil well pipe |
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| CN (1) | CN202433287U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103513010A (en) * | 2013-10-10 | 2014-01-15 | 中国科学院金属研究所 | Artificial gap device for researching gap corrosion simulation test and use method of artificial gap device |
| CN104422648A (en) * | 2013-08-30 | 2015-03-18 | 宝山钢铁股份有限公司 | Oil well pipe material deposition sulfur corrosion test method and fixture for sulfur corrosion test |
| CN111707603A (en) * | 2020-06-29 | 2020-09-25 | 浙江天能电池(江苏)有限公司 | Power storage battery plastic shell corrosion resistance testing device and method thereof |
-
2011
- 2011-12-27 CN CN2011205568766U patent/CN202433287U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104422648A (en) * | 2013-08-30 | 2015-03-18 | 宝山钢铁股份有限公司 | Oil well pipe material deposition sulfur corrosion test method and fixture for sulfur corrosion test |
| CN103513010A (en) * | 2013-10-10 | 2014-01-15 | 中国科学院金属研究所 | Artificial gap device for researching gap corrosion simulation test and use method of artificial gap device |
| CN103513010B (en) * | 2013-10-10 | 2015-07-15 | 中国科学院金属研究所 | Artificial gap device for researching gap corrosion simulation test and use method of artificial gap device |
| CN111707603A (en) * | 2020-06-29 | 2020-09-25 | 浙江天能电池(江苏)有限公司 | Power storage battery plastic shell corrosion resistance testing device and method thereof |
| CN111707603B (en) * | 2020-06-29 | 2021-09-07 | 浙江天能电池(江苏)有限公司 | Power storage battery plastic shell corrosion resistance testing device and method thereof |
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Legal Events
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|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20120912 Termination date: 20201227 |