CN117904640A - Corrosion inhibitor for inhibiting carbon dioxide corrosion and application thereof - Google Patents
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- 230000007797 corrosion Effects 0.000 title claims abstract description 121
- 238000005260 corrosion Methods 0.000 title claims abstract description 121
- 239000003112 inhibitor Substances 0.000 title claims abstract description 57
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 title claims description 42
- 229910002092 carbon dioxide Inorganic materials 0.000 title claims description 21
- 239000001569 carbon dioxide Substances 0.000 title claims description 20
- 230000002401 inhibitory effect Effects 0.000 title claims description 17
- UMGDCJDMYOKAJW-UHFFFAOYSA-N thiourea Chemical compound NC(N)=S UMGDCJDMYOKAJW-UHFFFAOYSA-N 0.000 claims abstract description 24
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims abstract description 19
- YHMYGUUIMTVXNW-UHFFFAOYSA-N 1,3-dihydrobenzimidazole-2-thione Chemical class C1=CC=C2NC(S)=NC2=C1 YHMYGUUIMTVXNW-UHFFFAOYSA-N 0.000 claims abstract description 17
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 claims abstract description 15
- IJINDUSMSVDESS-UHFFFAOYSA-N 2-benzylsulfanyl-1h-benzimidazole Chemical group N=1C2=CC=CC=C2NC=1SCC1=CC=CC=C1 IJINDUSMSVDESS-UHFFFAOYSA-N 0.000 claims abstract description 12
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Natural products NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 claims abstract description 12
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 claims abstract description 11
- 239000002904 solvent Substances 0.000 claims abstract description 9
- KFZMGEQAYNKOFK-UHFFFAOYSA-N Isopropanol Chemical compound CC(C)O KFZMGEQAYNKOFK-UHFFFAOYSA-N 0.000 claims abstract description 8
- LRHPLDYGYMQRHN-UHFFFAOYSA-N N-Butanol Chemical compound CCCCO LRHPLDYGYMQRHN-UHFFFAOYSA-N 0.000 claims abstract description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 5
- 238000011161 development Methods 0.000 claims description 4
- 239000007788 liquid Substances 0.000 claims description 2
- 239000000126 substance Substances 0.000 abstract description 3
- 239000012752 auxiliary agent Substances 0.000 abstract description 2
- 239000003208 petroleum Substances 0.000 abstract description 2
- 230000015572 biosynthetic process Effects 0.000 abstract 1
- 238000012360 testing method Methods 0.000 description 20
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 description 9
- 230000005764 inhibitory process Effects 0.000 description 9
- 239000003518 caustics Substances 0.000 description 8
- 239000007789 gas Substances 0.000 description 7
- 239000002184 metal Substances 0.000 description 7
- 239000000203 mixture Substances 0.000 description 5
- 239000000047 product Substances 0.000 description 5
- 229910000831 Steel Inorganic materials 0.000 description 4
- 239000010959 steel Substances 0.000 description 4
- XEKOWRVHYACXOJ-UHFFFAOYSA-N Ethyl acetate Chemical compound CCOC(C)=O XEKOWRVHYACXOJ-UHFFFAOYSA-N 0.000 description 3
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 3
- MTNDZQHUAFNZQY-UHFFFAOYSA-N imidazoline Chemical compound C1CN=CN1 MTNDZQHUAFNZQY-UHFFFAOYSA-N 0.000 description 3
- 239000000243 solution Substances 0.000 description 3
- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Chemical compound CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 description 2
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- TWRXJAOTZQYOKJ-UHFFFAOYSA-L Magnesium chloride Chemical compound [Mg+2].[Cl-].[Cl-] TWRXJAOTZQYOKJ-UHFFFAOYSA-L 0.000 description 2
- 238000005481 NMR spectroscopy Methods 0.000 description 2
- 244000137852 Petrea volubilis Species 0.000 description 2
- -1 alkyl phosphates Chemical class 0.000 description 2
- 238000004140 cleaning Methods 0.000 description 2
- 150000001875 compounds Chemical class 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 239000012043 crude product Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- RAXXELZNTBOGNW-UHFFFAOYSA-N imidazole Natural products C1=CNC=N1 RAXXELZNTBOGNW-UHFFFAOYSA-N 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000010287 polarization Effects 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- 238000005303 weighing Methods 0.000 description 2
- 208000016261 weight loss Diseases 0.000 description 2
- 230000004580 weight loss Effects 0.000 description 2
- 238000005160 1H NMR spectroscopy Methods 0.000 description 1
- 229910000967 As alloy Inorganic materials 0.000 description 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 229910000975 Carbon steel Inorganic materials 0.000 description 1
- 229910019142 PO4 Inorganic materials 0.000 description 1
- 229910021607 Silver chloride Inorganic materials 0.000 description 1
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 1
- 229960000583 acetic acid Drugs 0.000 description 1
- 238000013019 agitation Methods 0.000 description 1
- 125000000217 alkyl group Chemical group 0.000 description 1
- 150000001412 amines Chemical class 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 125000003118 aryl group Chemical group 0.000 description 1
- AGEZXYOZHKGVCM-UHFFFAOYSA-N benzyl bromide Chemical compound BrCC1=CC=CC=C1 AGEZXYOZHKGVCM-UHFFFAOYSA-N 0.000 description 1
- 239000012267 brine Substances 0.000 description 1
- 239000001110 calcium chloride Substances 0.000 description 1
- 229910001628 calcium chloride Inorganic materials 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 239000010962 carbon steel Substances 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 235000014113 dietary fatty acids Nutrition 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 238000000840 electrochemical analysis Methods 0.000 description 1
- 238000006056 electrooxidation reaction Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000000194 fatty acid Substances 0.000 description 1
- 229930195729 fatty acid Natural products 0.000 description 1
- 150000004665 fatty acids Chemical class 0.000 description 1
- 239000012467 final product Substances 0.000 description 1
- 239000013022 formulation composition Substances 0.000 description 1
- 239000012362 glacial acetic acid Substances 0.000 description 1
- 238000000227 grinding Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- WGCNASOHLSPBMP-UHFFFAOYSA-N hydroxyacetaldehyde Natural products OCC=O WGCNASOHLSPBMP-UHFFFAOYSA-N 0.000 description 1
- 150000002462 imidazolines Chemical class 0.000 description 1
- 125000002883 imidazolyl group Chemical group 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 229910001629 magnesium chloride Inorganic materials 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000003345 natural gas Substances 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 238000000643 oven drying Methods 0.000 description 1
- 229940083254 peripheral vasodilators imidazoline derivative Drugs 0.000 description 1
- 239000003209 petroleum derivative Substances 0.000 description 1
- 125000001997 phenyl group Chemical group [H]C1=C([H])C([H])=C(*)C([H])=C1[H] 0.000 description 1
- 235000021317 phosphate Nutrition 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 229940083082 pyrimidine derivative acting on arteriolar smooth muscle Drugs 0.000 description 1
- 150000003230 pyrimidines Chemical class 0.000 description 1
- 230000009919 sequestration Effects 0.000 description 1
- HKZLPVFGJNLROG-UHFFFAOYSA-M silver monochloride Chemical compound [Cl-].[Ag+] HKZLPVFGJNLROG-UHFFFAOYSA-M 0.000 description 1
- 238000002791 soaking Methods 0.000 description 1
- HPALAKNZSZLMCH-UHFFFAOYSA-M sodium;chloride;hydrate Chemical compound O.[Na+].[Cl-] HPALAKNZSZLMCH-UHFFFAOYSA-M 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 238000001228 spectrum Methods 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000001308 synthesis method Methods 0.000 description 1
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/50—Improvements relating to the production of bulk chemicals
- Y02P20/54—Improvements relating to the production of bulk chemicals using solvents, e.g. supercritical solvents or ionic liquids
Landscapes
- Preventing Corrosion Or Incrustation Of Metals (AREA)
Abstract
The invention belongs to the field of oil field chemical auxiliary agents in petroleum exploitation, and particularly relates to a corrosion inhibitor containing mercaptobenzimidazole derivatives and application thereof, wherein the corrosion inhibitor is mainly used for corrosion under supercritical CO 2, and comprises 0.1-60% of mercaptobenzimidazole derivatives by weight percent; thiourea 0.1-60 wt% and solvent 25-99.5 wt%; the mercaptobenzimidazole derivative is 2-benzylthio-1H-benzimidazole; the solvent is one or more of methanol, ethanol, isopropanol, ethylene glycol, butanol and water. The corrosion inhibitor has the advantages of small dosage, high efficiency, firm film formation, good stability and low corrosion rate under lower concentration.
Description
Technical Field
The invention belongs to the field of oil field chemical auxiliary agents for petroleum exploitation, and relates to a corrosion inhibitor for inhibiting carbon dioxide corrosion, in particular to a corrosion inhibitor for inhibiting corrosion under the condition of supercritical carbon dioxide and application thereof.
Background
The metal corrosion causes huge economic loss, and the loss caused by the metal corrosion is a considerable part of the total national production value every year. In oil and gas exploitation, carbon dioxide (CO 2) is a commonly contained associated corrosive gas, which can cause serious corrosion to metal pipelines and equipment, and seriously affects the reliability and service life of an oil and gas field gathering and transportation system.
The utilization of CO 2 to improve the recovery ratio (CO 2 -EOR) of oil and gas is an important part of the development of CO 2 carbon capture, utilization and sequestration (CCUS) of CO 2. The casing pipe, the gathering and transporting pipeline of the oil and gas field and the transporting pipeline in the carbon dioxide enhanced oil recovery technology are usually made of carbon steel, and have the characteristics of high strength and low cost. The CO 2 corrosive environment tends to be at high temperatures and pressures as the well depth increases. Different oil pipe depths correspond to different corrosion environments, from normal temperature and pressure on the ground to high temperature and pressure in the pit, and the sleeve steel is often subjected to different corrosion conditions, including a non-critical CO 2 environment, a subcritical CO 2 environment and a supercritical CO 2 corrosion environment. Aiming at the problem of CO 2 corrosion, compared with the protection measures such as alloy-resistant steel, coating protection, and the like, the corrosion inhibitor is the most flexible and cost-effective means, and is widely applied in the petroleum and natural gas exploitation and gathering process. The corrosion inhibitor is a substance which can obviously reduce the corrosion speed of a metal material in a metal corrosion medium by adding a trace or small amount into the medium. High-efficiency corrosion inhibitors commonly used in non-supercritical CO 2 environments are as follows: when the long-chain imidazoline and the derivatives thereof, pyrimidine derivatives, amine corrosion inhibitors and the like are applied to severe supercritical CO 2 environment, the corrosion inhibition efficiency is obviously reduced. In a non-supercritical CO 2-H2 O system, the corrosion inhibition efficiency of the imidazoline is more than 90%, while in a supercritical CO 2-H2 O system, the corrosion inhibition efficiency of the imidazoline is less than 80%. There is therefore a need to study the structure of effective corrosion inhibitors in supercritical conditions.
Disclosure of Invention
The invention aims to overcome the defect of the prior corrosion inhibitor that the effect is insufficient under supercritical CO 2 and provide a corrosion inhibitor for inhibiting carbon dioxide corrosion with low corrosion rate.
The invention also provides application of the corrosion inhibitor for inhibiting carbon dioxide corrosion in development and centralized transportation of oil and gas fields.
In order to solve the technical problems, the invention is realized as follows:
a corrosion inhibitor for inhibiting corrosion under supercritical carbon dioxide, comprising, in weight percent:
0.1 to 60 percent of mercaptobenzimidazole derivative;
Thiourea 0.1-60%;
25 to 99.5 percent of solvent.
As a preferred embodiment, the mercaptobenzimidazole derivative of the present invention is 2-benzylthio-1H-benzimidazole.
Further, the molecular structural formula of the 2-benzylthio-1H-benzimidazole is as follows:
。
further, the solvent is one or a mixture of more than two of methanol, ethanol, isopropanol, glycol, butanol and water.
Further, the mass ratio of the thiourea to the mercaptobenzimidazole derivative is 4-1: 1 to 4.
Further, the mass ratio of the thiourea to the mercaptobenzimidazole derivative is 3-1: 1 to 3.
Further, the total active concentration of the corrosion inhibitor is 0.5-60% in the formula by weight percent.
Further, when the corrosion inhibitor is filled into a corrosive environment, the effective content of the corrosion inhibitor in the corrosive liquid is 1-1000 ppm.
The corrosion inhibitor for inhibiting supercritical carbon dioxide corrosion is applied to oil and gas field development and centralized transportation.
The mercapto benzimidazole derivative-containing corrosion inhibitor can effectively inhibit corrosion under the supercritical CO 2 corrosion condition, can be synergistically combined with multipoint adsorption on the metal surface to form a firm metal protection film, and has good stability. Experimental results show that the corrosion inhibitor containing the mercaptobenzimidazole derivative has lower corrosion rate, better corrosion inhibition effect and minimal local corrosion.
Drawings
The invention is further described in connection with the following detailed description. The scope of the present invention is not limited to the following description.
FIG. 1 is an image of an unaided non-inhibitor appearance and maximum pitting depth;
FIG. 2 is an image of the appearance and maximum pitting depth of a single corrosion inhibitor of 2-benzylthio-1H-benzimidazole;
Fig. 3 is an image of the appearance and maximum pitting depth of corrosion inhibitor a (2-benzylthio-1H-benzimidazole/thiourea=1:3).
Detailed Description
The invention relates to a corrosion inhibitor which contains a mixture of mercaptobenzimidazole derivative and thiourea and is based on CO 2.
Wherein, the typical structure of the mercaptobenzimidazole derivative is shown in the following formula I, and the 2-benzylthio-1H-benzimidazole is shown in the specification:
The counter ion is Cl -, and the content of the mercaptobenzimidazole derivative is 0.1-60 percent (weight).
The corrosion inhibitor formula also comprises thiourea, and the content is 0.1-60 percent (weight). The ratio of thiourea to mercaptobenzimidazole derivative is 4-1: 1 to 4. Preferably 3 to 1:1 to 3.
Other corrosion inhibitors such as commonly used imidazoline derivatives, alkyl phosphates, quaternary amine salts, fatty acids, etc. can also be added, and the alkyl chain length is between 12 and 22.
The solvent includes methanol, ethanol, isopropanol, ethylene glycol, butanol, water, etc. The content of the solvent in the product is 25-99.5 wt%.
The compound corrosion inhibitor can be continuously injected into a wellbore or a gathering pipeline containing supercritical carbon dioxide corrosion by pumping, and the injection amount is 1-1000 ppm when the compound corrosion inhibitor is injected into an application environment.
To further illustrate the effectiveness of the present invention in a corrosive environment containing primarily CO 2, the present invention is presented in the following examples, but the examples are not intended to limit the scope of the invention in any way.
Example 1:
The synthesis method of the 2-benzylthio-1H-benzimidazole is shown as II:
20mmol of MBI is dissolved in 25mL of 1M NaOH solution and 25mmol of benzyl bromide is added with vigorous stirring. The crude product was obtained after reaction for 4h at 55 ℃. The crude product was neutralized to neutrality with glacial acetic acid. Then extracted four times with 40mL ethyl acetate. Then, the mixture was distilled off to obtain a white solid, which was dried at 60℃for 2 hours to obtain the final product. The synthesized product was characterized using a Nuclear Magnetic Resonance (NMR) spectrometer (AV-400, bruker). Broad peaks in the range 3145-3000cm -1 and multiple peaks in the range 1560-1295-cm -1 correspond to C-H stretching vibrations and C-C backbone vibrations of aromatic rings (benzene rings and imidazole rings), respectively. The 3-weight peak between 780-756 cm -1 is the C-S-C symmetrical telescopic vibration peak. The two broad peaks in the range 744-735 cm -1 are C-S-C antisymmetric stretching vibrational peaks. In the 1H NMR (DMSO-d 6) spectrum of the synthesized product, δ13.43 (S, 1H, -C-NH-C-); 7.25-7.4 (m, 5H, -C-Ar-H), 7.13-7.44 (m, 4H, imidazole benzo ring-Ar-H), 4.36 (m, 2H, -S-CH 2-).
Example 2:
The composition of the CO2 corrosion inhibitor is shown in table 1.
TABLE 1 formulation composition
The preparation method of the corrosion inhibitor A comprises the following steps:
the corrosion inhibitor component and methanol were stirred at 30 ℃ to dissolve completely.
The corrosion test experiments were as follows, with the corrosion test simulated water composition: naCl 2.587 g/L and NaHCO 31.740 g/L,CaCl20.323 g/L,MgCl2 0.070.070 g/L.
Adding 100ppm of corrosion inhibitor with effective concentration after preparing brine, deoxidizing for 8 hours by high-purity nitrogen in advance, putting into a2 liter stainless steel kettle for 1.6 liter of solution, deoxidizing for 1 hour, introducing CO 2 to saturate for one hour, then starting a stirrer, heating to 60 ℃, injecting CO 2 to 10MPa by a booster pump, adopting N80 steel for a weight-loss hanging piece, grinding the test surface to be smooth by using No. 600 sand paper and No. 1000 sand paper, wherein the size of the hanging piece is 40x13x2 mm. Soaking in acetone and absolute ethanol for 5 min, removing oil residue on the metal surface, oven drying, and weighing. The test was performed under rotational agitation at 1100 rpm. After 72 hours of testing, the corrosion test and cooling device were completed. And (3) placing the hanging piece into an ultrasonic instrument for cleaning by using acetone and ethanol after the test, wiping the surface of the hanging piece by using an eraser to remove a corrosion product film, drying and weighing. The corrosion rate was calculated and 3 identical coupons were placed in each experiment and the corrosion rate averaged. Corrosion rateThe calculation can be made by the following formula:
TABLE 2 dynamic Corrosion weight loss test results
| Corrosion inhibitors | Corrosion speed (mm/y) | Corrosion inhibition rate% | Depth of pitting |
| Blank (without) | 11.9061 | 105.62 | |
| Corrosive agent D | 0.0417 | 99.65% | 0.40 |
| Corrosive agent F | 2.4455 | 79.46% | |
| Corrosive agent G | 5.7899 | 51.37% |
It can be seen that the corrosion inhibitor D (2-benzylthio-1H-benzimidazole) has the lowest corrosion rate and the highest corrosion inhibition rate, but the surface still has lower pitting corrosion.
Example 3:
in order to reduce pitting corrosion and further optimize the formula, an electrochemical electrode system is arranged in a test kettle, a working electrode is made of N80 steel, a reference electrode is Ag/AgCl, and an auxiliary electrode is Pt. Corrosion inhibition was obtained by measuring the corrosion current density (i corr) using a Gamry company Reference 600+ electrochemical workstation using an electrochemical polarization curve ) The following formula is given:
i corr（o） and i corr(inh) are the current densities in the blank and in the presence of corrosion inhibitors, respectively.
After testing other conditions for stable open circuit potential as in case 2 of corrosion weightlessness, the scan speed of the polarization test potential is 0.33mV/s, and the scan range is-250 to 250mV of the open circuit potential. After 72 hours of testing, the corrosion test and cooling device were completed. For observing the corrosion appearance, the hanging piece is simultaneously 10x10x2mm in the test, an ultrasonic instrument is used for cleaning with acetone and ethanol after the test, and an eraser is used for wiping the surface of the hanging piece to remove a corrosion product film. The corrosion rate test and the partial pitting test results are shown in table 3.
TABLE 3 electrochemical corrosion test results
| Corrosion inhibitors | Corrosion inhibition rate% | Depth of pitting (mum) |
| No corrosion inhibitor | 105.62 | |
| Corrosive agent A | 99.6% | 0.01 |
| Corrosive agent B | 97.1% | -- |
| Corrosive agent C | 95.6% | -- |
| Corrosive agent D | 93.1% | 0.40 |
| Corrosive agent E | 56.9% | -- |
FIG. 1 is a blank non-inhibitor appearance image and maximum pitting depth. FIG. 2 is an image of the appearance and maximum pitting depth of a single corrosion inhibitor of 2-benzylthio-1H-benzimidazole. Fig. 3 is an image of the appearance and maximum pitting depth of corrosion inhibitor a (2-benzylthio-1H-benzimidazole/thiourea=1/3).
From the corrosion rate and the photo of the appearance of the hanging piece after the test, the mixed corrosion inhibitors A-C have higher corrosion inhibition rate than the single corrosion inhibitor, and the pitting corrosion degree of the corrosion inhibitor A is minimum in nanometer level. It is noted that the absolute value of the corrosion rate of the electrochemical test is not completely consistent with the corrosion weightlessness test result, but the trend is consistent.
The above-disclosed embodiments or specific description of the invention may be made or practiced without exceeding the scope of the presently disclosed experimental approaches. All technical solutions or methods described in the preferred embodiments of the present invention are only for illustrating the present invention and are not limited to the specific description or examples of the present invention, and it should be understood by those skilled in the art that modifications or equivalent substitutions, which do not violate the concept, scope and spirit of the present invention, are all within the scope of the present invention.
Claims (9)
1. A corrosion inhibitor for inhibiting corrosion under supercritical carbon dioxide, comprising, in weight percent:
0.1 to 60 percent of mercaptobenzimidazole derivative;
Thiourea 0.1-60%;
25 to 99.5 percent of solvent.
2. The corrosion inhibitor for inhibiting corrosion of supercritical carbon dioxide according to claim 1, wherein: the mercaptobenzimidazole derivative is 2-benzylthio-1H-benzimidazole.
3. The corrosion inhibitor for inhibiting corrosion of supercritical carbon dioxide according to claim 2, wherein: the molecular structural formula of the 2-benzylthio-1H-benzimidazole is as follows:
。
4. A corrosion inhibitor solvent for inhibiting supercritical carbon dioxide according to claim 3, wherein: the solvent is one or more of methanol, ethanol, isopropanol, ethylene glycol, butanol and water.
5. The corrosion inhibitor for inhibiting corrosion of supercritical carbon dioxide according to claim 4, wherein: the mass ratio of the thiourea to the mercaptobenzimidazole derivative is 4-1: 1 to 4.
6. The corrosion inhibitor for inhibiting corrosion of supercritical carbon dioxide according to claim 5, wherein: the mass ratio of the thiourea to the mercaptobenzimidazole derivative is 3-1: 1 to 3.
7. The corrosion inhibitor for inhibiting corrosion of supercritical carbon dioxide according to claim 6, wherein: the total active concentration of the corrosion inhibitor is 0.5-60% in weight percent.
8. The corrosion inhibitor for inhibiting corrosion of supercritical carbon dioxide according to claim 7, wherein: when the corrosion inhibitor is filled into a corrosion environment, the effective content of the corrosion inhibitor in the corrosion liquid is 1-1000 ppm.
9. Use of a corrosion inhibitor according to any one of claims 1 to 8 for inhibiting corrosion of supercritical carbon dioxide in oil and gas field development and transportation.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410023610.7A CN117904640A (en) | 2024-01-08 | 2024-01-08 | Corrosion inhibitor for inhibiting carbon dioxide corrosion and application thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410023610.7A CN117904640A (en) | 2024-01-08 | 2024-01-08 | Corrosion inhibitor for inhibiting carbon dioxide corrosion and application thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN117904640A true CN117904640A (en) | 2024-04-19 |
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| CN202410023610.7A Pending CN117904640A (en) | 2024-01-08 | 2024-01-08 | Corrosion inhibitor for inhibiting carbon dioxide corrosion and application thereof |
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