CN114686195A - High-temperature-resistant corrosion inhibitor for oil field water injection well and preparation method thereof - Google Patents
High-temperature-resistant corrosion inhibitor for oil field water injection well and preparation method thereof Download PDFInfo
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- 238000005260 corrosion Methods 0.000 title claims abstract description 167
- 230000007797 corrosion Effects 0.000 title claims abstract description 166
- 239000003112 inhibitor Substances 0.000 title claims abstract description 117
- 238000002347 injection Methods 0.000 title claims abstract description 26
- 239000007924 injection Substances 0.000 title claims abstract description 26
- 238000002360 preparation method Methods 0.000 title claims abstract description 18
- 239000002332 oil field water Substances 0.000 title claims abstract description 12
- MTNDZQHUAFNZQY-UHFFFAOYSA-N imidazoline Chemical compound C1CN=CN1 MTNDZQHUAFNZQY-UHFFFAOYSA-N 0.000 claims abstract description 49
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 claims abstract description 33
- NLKNQRATVPKPDG-UHFFFAOYSA-M potassium iodide Chemical compound [K+].[I-] NLKNQRATVPKPDG-UHFFFAOYSA-M 0.000 claims abstract description 30
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- 238000003756 stirring Methods 0.000 claims abstract description 15
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- KWOLFJPFCHCOCG-UHFFFAOYSA-N Acetophenone Chemical compound CC(=O)C1=CC=CC=C1 KWOLFJPFCHCOCG-UHFFFAOYSA-N 0.000 description 2
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- 238000005536 corrosion prevention Methods 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 238000000157 electrochemical-induced impedance spectroscopy Methods 0.000 description 2
- 238000009472 formulation Methods 0.000 description 2
- 238000002290 gas chromatography-mass spectrometry Methods 0.000 description 2
- VKYKSIONXSXAKP-UHFFFAOYSA-N hexamethylenetetramine Chemical compound C1N(C2)CN3CN1CN2C3 VKYKSIONXSXAKP-UHFFFAOYSA-N 0.000 description 2
- 229910052739 hydrogen Inorganic materials 0.000 description 2
- 238000001453 impedance spectrum Methods 0.000 description 2
- AWJUIBRHMBBTKR-UHFFFAOYSA-N isoquinoline Chemical compound C1=NC=CC2=CC=CC=C21 AWJUIBRHMBBTKR-UHFFFAOYSA-N 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
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- 229910052760 oxygen Inorganic materials 0.000 description 2
- 229920000768 polyamine Polymers 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 238000010998 test method Methods 0.000 description 2
- BAERPNBPLZWCES-UHFFFAOYSA-N (2-hydroxy-1-phosphonoethyl)phosphonic acid Chemical compound OCC(P(O)(O)=O)P(O)(O)=O BAERPNBPLZWCES-UHFFFAOYSA-N 0.000 description 1
- ARLSYSVVBAMYKA-UHFFFAOYSA-N 1,3-bis(phenylmethoxy)propan-2-ol Chemical compound C=1C=CC=CC=1COCC(O)COCC1=CC=CC=C1 ARLSYSVVBAMYKA-UHFFFAOYSA-N 0.000 description 1
- 238000005160 1H NMR spectroscopy Methods 0.000 description 1
- DUIOKRXOKLLURE-UHFFFAOYSA-N 2-octylphenol Chemical compound CCCCCCCCC1=CC=CC=C1O DUIOKRXOKLLURE-UHFFFAOYSA-N 0.000 description 1
- SJZRECIVHVDYJC-UHFFFAOYSA-N 4-hydroxybutyric acid Chemical compound OCCCC(O)=O SJZRECIVHVDYJC-UHFFFAOYSA-N 0.000 description 1
- 229940006015 4-hydroxybutyric acid Drugs 0.000 description 1
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 1
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 1
- 239000003109 Disodium ethylene diamine tetraacetate Substances 0.000 description 1
- ZGTMUACCHSMWAC-UHFFFAOYSA-L EDTA disodium salt (anhydrous) Chemical compound [Na+].[Na+].OC(=O)CN(CC([O-])=O)CCN(CC(O)=O)CC([O-])=O ZGTMUACCHSMWAC-UHFFFAOYSA-L 0.000 description 1
- 238000005033 Fourier transform infrared spectroscopy Methods 0.000 description 1
- 238000004566 IR spectroscopy Methods 0.000 description 1
- 239000004698 Polyethylene Substances 0.000 description 1
- 239000004721 Polyphenylene oxide Substances 0.000 description 1
- JUJWROOIHBZHMG-UHFFFAOYSA-N Pyridine Chemical compound C1=CC=NC=C1 JUJWROOIHBZHMG-UHFFFAOYSA-N 0.000 description 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- 230000002378 acidificating effect Effects 0.000 description 1
- 230000001476 alcoholic effect Effects 0.000 description 1
- IOJUPLGTWVMSFF-UHFFFAOYSA-N benzothiazole Chemical class C1=CC=C2SC=NC2=C1 IOJUPLGTWVMSFF-UHFFFAOYSA-N 0.000 description 1
- QRUDEWIWKLJBPS-UHFFFAOYSA-N benzotriazole Chemical compound C1=CC=C2N[N][N]C2=C1 QRUDEWIWKLJBPS-UHFFFAOYSA-N 0.000 description 1
- 239000012964 benzotriazole Substances 0.000 description 1
- KCXMKQUNVWSEMD-UHFFFAOYSA-N benzyl chloride Chemical compound ClCC1=CC=CC=C1 KCXMKQUNVWSEMD-UHFFFAOYSA-N 0.000 description 1
- 229940073608 benzyl chloride Drugs 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
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- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
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- 229940126678 chinese medicines Drugs 0.000 description 1
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- 238000010790 dilution Methods 0.000 description 1
- 239000012895 dilution Substances 0.000 description 1
- 235000019301 disodium ethylene diamine tetraacetate Nutrition 0.000 description 1
- DDXLVDQZPFLQMZ-UHFFFAOYSA-M dodecyl(trimethyl)azanium;chloride Chemical compound [Cl-].CCCCCCCCCCCC[N+](C)(C)C DDXLVDQZPFLQMZ-UHFFFAOYSA-M 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 238000000840 electrochemical analysis Methods 0.000 description 1
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- 239000004312 hexamethylene tetramine Substances 0.000 description 1
- 235000010299 hexamethylene tetramine Nutrition 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-M hydroxide Chemical compound [OH-] XLYOFNOQVPJJNP-UHFFFAOYSA-M 0.000 description 1
- PZOUSPYUWWUPPK-UHFFFAOYSA-N indole Natural products CC1=CC=CC2=C1C=CN2 PZOUSPYUWWUPPK-UHFFFAOYSA-N 0.000 description 1
- RKJUIXBNRJVNHR-UHFFFAOYSA-N indolenine Natural products C1=CC=C2CC=NC2=C1 RKJUIXBNRJVNHR-UHFFFAOYSA-N 0.000 description 1
- 238000012844 infrared spectroscopy analysis Methods 0.000 description 1
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- 150000007524 organic acids Chemical class 0.000 description 1
- 125000005375 organosiloxane group Chemical group 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 150000005359 phenylpyridines Chemical class 0.000 description 1
- 229920000570 polyether Polymers 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- 229920000056 polyoxyethylene ether Polymers 0.000 description 1
- 229940051841 polyoxyethylene ether Drugs 0.000 description 1
- 150000003222 pyridines Chemical class 0.000 description 1
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
- C09K8/54—Compositions for in situ inhibition of corrosion in boreholes or wells
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- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Preventing Corrosion Or Incrustation Of Metals (AREA)
Abstract
The invention discloses a high-temperature-resistant corrosion inhibitor for an oil field water injection well and a preparation method thereof, wherein the preparation method comprises the following steps: adding a mixed solution of an imidazoline corrosion inhibitor, a Mannich base acidification corrosion inhibitor, a quinoline quaternary ammonium salt and absolute ethyl alcohol into a five-neck flask, slowly dropwise adding hydrochloric acid to adjust the pH value, and uniformly stirring; then, respectively and simultaneously dripping naphthylaminobenzene and benzyloxy glycidyl ether by using a constant pressure dropping funnel, and refluxing for 10-12h at 70-100 ℃ after finishing dripping; and after the reaction is finished, adding a small amount of anhydrous methanol, uniformly stirring to obtain a reddish brown liquid, and compounding with potassium iodide to obtain the compound imidazoline corrosion inhibitor. The corrosion inhibitor can effectively reduce uniform corrosion rate and pitting corrosion rate, is suitable for high-temperature environment of a water injection well, and is beneficial to efficiently developing the oilfield exploitation process.
Description
Technical Field
The invention relates to the technical field of oilfield development, in particular to a high-temperature-resistant corrosion inhibitor for an oilfield water injection well and a preparation method thereof.
Background
The water injection oil replacement technology can obviously improve the oil reservoir recovery ratio of the tower river oil field, but the same shaft injection and production integrated alternative production mode is often accompanied with the serious corrosion problem. The water injection well of the tower river oil field is in high concentration carbon dioxide (CO)2) High concentration of hydrogen sulfide (H)2S), acidic, high temperature and high chloride ion (Cl)-) In the concentration environment, the corrosion of the underground pipe column, particularly the high-temperature part, is the most serious, and the serious environmental pollution and economic loss are easily caused.
Because the corrosion inhibitor is sensitive to environmental changes, and the components of the common corrosion inhibitor can be changed in the harsh environment of high temperature and high salt, the corrosion inhibitor is ineffective, so the prior corrosion inhibitor can not meet the requirements of corrosion prevention. The single corrosion inhibitor has poor high temperature resistance, and the corrosion inhibitor can be decomposed and lose efficacy when the temperature is generally raised to 100 ℃, so that the corrosion inhibition effect is difficult to exert.
Chinese patent CN107829094B discloses a high temperature resistant corrosion inhibitor and a preparation method thereof, wherein the sulfur-resistant high temperature resistant corrosion inhibitor at least comprises the following components in parts by weight: 15-30 parts of imidazoline compound, 1.5-2 parts of benzothiazole derivative, 0.15-0.5 part of basic catalyst and 25-35 parts of solvent. The alkaline catalyst is alkaline hydroxide, and the solvent is a mixture of alcohol and benzene or homologous compounds. Wherein the imidazoline compound contains organosiloxane groups. Wherein the preparation reaction steps of the imidazoline compound comprise: under the promotion of a water carrying agent, stirring anhydrous organic acid and organic polyamine, heating and refluxing, reacting for 8-12h under the conditions of 140 ℃ and 180 ℃, cooling the system to 100 ℃, and distilling to remove toluene to obtain a product. However, the corrosion inhibitor has fewer components with the corrosion inhibition effect, and the corrosion inhibition effect on the oil pipe exposed to the easily corroded environment for a long time is relatively limited.
Chinese patent application CN110079807A discloses an oil field scale and corrosion inhibitor suitable for high temperature and a preparation method thereof, comprising the following steps: mixing and stirring nonionic imidazoline polyether, octyl phenol polyoxyethylene ether OP-10, polyethylene polyamine, benzotriazole and water uniformly to prepare solution A; mixing and stirring disodium ethylene diamine tetraacetate, hydroxyethylidene diphosphonic acid, hexamethylenetetramine, dodecyl trimethyl ammonium chloride and water uniformly to prepare solution B; and mixing and stirring the solution A and the solution B uniformly to obtain the anti-scaling corrosion inhibitor. However, the corrosion inhibitor prepared by the method has a corrosion inhibition rate of about 75% at 70 ℃, and the effect needs to be further optimized.
And secondly, the depth of a water injection well of the tower river oil field is 5km, the temperature reaches 130 ℃, and the corrosion inhibition rate of a single corrosion inhibitor is lower under the environment, so that the requirement of complex working conditions cannot be met. In the environment with harsh conditions, the development of a targeted high-efficiency corrosion inhibitor is urgently needed, the temperature resistance, the physical and chemical properties and the component formula of the corrosion inhibitor have strict requirements, and the underground corrosion prevention technical level of the water injection well is improved.
Disclosure of Invention
The invention aims to provide a high-temperature-resistant corrosion inhibitor for an oil field water injection well and a preparation method thereof. The corrosion inhibitor has the advantages of being suitable for a dilution system of a Tahe oilfield, has obvious corrosion inhibition performance at the temperature of 130 ℃, and can achieve the effects of having no obvious local corrosion trace, generating compact corrosion products and well protecting a matrix material.
In order to achieve the aim, the invention provides a high-temperature-resistant corrosion inhibitor for an oil field water injection well, which comprises the following raw materials: imidazoline corrosion inhibitor, Mannich base acidification corrosion inhibitor, quinoline quaternary ammonium salt, hydrochloric acid, naphthylaminobenzene, benzyloxy glycidyl ether, potassium iodide and alcohol solvent.
Preferably, the water content of the corrosion inhibitor is 40.0-48.0%.
Preferably, the alcoholic solvent includes methanol and ethanol.
The invention also provides a preparation method of the high-temperature-resistant corrosion inhibitor for the oil field water injection well, which comprises the following steps:
(1) adding a mixed solution of imidazoline corrosion inhibitor, Mannich base acidification corrosion inhibitor, quinoline quaternary ammonium salt and absolute ethyl alcohol into a five-neck flask, adjusting pH with hydrochloric acid, and uniformly stirring;
(2) then, dripping naphthylaminobenzene and benzyloxy glycidyl ether by using a constant pressure dropping funnel respectively;
(3) after the reaction is finished, adding a small amount of anhydrous methanol into the flask, and uniformly stirring to obtain a reddish brown liquid; and adding potassium iodide, and uniformly stirring to obtain the compound imidazoline corrosion inhibitor, namely the high-temperature-resistant corrosion inhibitor for the oilfield water injection well.
Preferably, the mass ratio of the imidazoline corrosion inhibitor, the Mannich base acidification corrosion inhibitor and the quinoline quaternary ammonium salt in the corrosion inhibitor in the step (1) is 1-1.2:1-1.2: 1.2-1.6.
Preferably, the pH is adjusted to 1-3 in step (1).
Preferably, the weight ratio of the added amount of the naphthylamino benzene and the benzyloxy glycidyl ether in the step (2) is 1-1.3: 1-1.3.
Preferably, the naphthylamino benzene and benzyloxy glycidyl ether are refluxed at 70-100 ℃ for 10-12h after the addition of the naphthylamino benzene and benzyloxy glycidyl ether in step (2) is completed.
Preferably, the mass ratio of the addition amount of the anhydrous methanol to the addition amount of the potassium iodide in the step (3) is 1-1.2: 1-1.3.
Preferably, the stirring time in step (3) is 7-10 min.
Preferably, the mass ratio of the imidazoline corrosion inhibitor, the naphthylaminobenzene and the potassium iodide is 1-1.3:1-1.2:1-1.2, and more preferably 1:1: 1.
Compared with the prior art, the invention has the following beneficial effects:
(1) the uniform corrosion rate of the compounded imidazoline corrosion inhibitor at 130 ℃ is 0.0856mm/a, the pitting rate is 0.1123mm/a, the compounded imidazoline corrosion inhibitor has lower uniform corrosion rate of 0.1824mm/a and pitting rate of 0.2358mm/a than the imidazoline corrosion inhibitor, and the compounded imidazoline corrosion inhibitor has greatly reduced uniform corrosion rate of 0.6214mm/a and pitting rate of 0.7078mm/a than the blank group. The corrosion inhibition performance of the invention is good, and the invention is applied to the diluting system of the tower river oil field, and has no obvious local corrosion phenomenon.
(2) The corrosion inhibitor product is analyzed by means of infrared spectroscopy (FTIR), nuclear magnetic resonance (1H NMR), ion chromatography (GC), Mass Spectrometry (MS), X fluorescence spectrum analysis (XRF) and the like, and the types and the contents of elements contained in a corrosion inhibitor sample can be analyzed through the testing means, the formula of the corrosion inhibitor is analyzed, and the effective ingredients in the corrosion inhibitor are known.
(3) The screening process of the invention has the following remarkable effects: the invention adopts an electrochemical test method as a main part, and can realize the purpose of rapidly screening the corrosion inhibitor; the method can simultaneously consider the probability of pitting corrosion and the probability of pitting corrosion depth, and avoids the defect of evaluating by adopting a single average corrosion rate; the invention can accurately screen the corrosion inhibitor with excellent protection effect by multi-level, multi-angle and multi-method screening evaluation.
Drawings
FIG. 1 is an infrared spectrum of an imidazoline corrosion inhibitor;
FIG. 2 is an infrared chart of the compound imidazoline corrosion inhibitor;
FIG. 3 is an AC impedance spectrum of different corrosion inhibitor sets.
Detailed Description
The present invention will be further explained with reference to specific examples in order to make the technical means, the technical features, the technical objectives and the effects of the present invention easier to understand, but the following examples are only preferred embodiments of the present invention, and not all embodiments of the present invention. Based on the embodiments in the implementation, other embodiments obtained by those skilled in the art without any creative efforts belong to the protection scope of the present invention.
It is to be noted that materials, reagents and the like used in the following examples are commercially available unless otherwise specified. Wherein raw materials such as imidazoline corrosion inhibitor, quinoline quaternary ammonium salt, Mannich base acidification corrosion inhibitor, naphthylaminobenzene, benzyloxy glycidyl ether, potassium iodide and the like used in the embodiment of the application are purchased from Chinese medicines.
Examples
A preparation method of a high-temperature-resistant corrosion inhibitor for an oil field water injection well comprises the following steps:
(1) adding a mixed solution of an imidazoline corrosion inhibitor, a Mannich base acidification corrosion inhibitor, a quinoline quaternary ammonium salt and absolute ethyl alcohol into a five-neck flask, dropwise adding hydrochloric acid to adjust the pH value, and uniformly stirring;
(2) then, dripping naphthylaminobenzene and benzyloxy glycidyl ether by using a constant-pressure dropping funnel respectively, and performing reflux treatment after dripping is finished;
(3) and adding anhydrous methanol after the reaction is finished, uniformly stirring to obtain a reddish brown liquid, adding potassium iodide, and compounding to obtain the compound imidazoline corrosion inhibitor.
Wherein, the specific experimental parameters in the preparation method are shown in the following table:
TABLE 1
The corrosion inhibition effect test method comprises the following steps: the corrosion behavior of P110 steel under the working condition of corrosion under the thick oil doped thin well of the Tahe oilfield is researched, and the corrosion inhibition performance of the high-temperature resistant corrosion inhibitor prepared in the laboratory synthesis examples 1-4 and comparative examples 1-4 at 130 ℃ is evaluated. The experimental conditions are as follows: 0.2MPa CO2，0.9Mpa H2S, 40% of water, 60% of oil and 300ppm of corrosion inhibitor filling concentration. The evaluation results were as follows:
TABLE 2 evaluation of Corrosion inhibition Effect
Test example
1. Infrared spectroscopic analysis nuclear magnetic resonance test:
the infrared test is used for drying the corrosion inhibitor sample, and the water content in the imidazoline corrosion inhibitor can be obtained by calculating the loss of the sample mass before and after the treatment to be 33.0-34.0%; the water content in the compound imidazoline corrosion inhibitor is 40.0-41.0%.
Imidazoline corrosion inhibitor test results: the thiourea in the sample can be detected by the infrared spectrogram of the dried sample of the sample.
The test result of the compound imidazoline corrosion inhibitor is as follows: the thiourea in the sample can be detected by the infrared spectrogram of the dried sample of the sample.
2. Nuclear magnetic resonance testing:
imidazoline corrosion inhibitor test results: the components such as quaternary ammonium salt, methanol, ethylene glycol, propiolic alcohol and the like in the sample can be detected by a nuclear magnetic resonance image.
The test result of the compound imidazoline corrosion inhibitor is as follows: the components such as Mannich quaternary ammonium salt, methanol, ethylene glycol, propiolic alcohol and the like in the sample can be detected by a nuclear magnetic resonance image.
3. GC-MS analysis:
imidazoline corrosion inhibitor test results: the samples were analyzed by GC-MS for RT 1.349min (ethanol), RT 10.258min (acetophenone), RT 11.416min (1-phenyl-2-propenyl-1-propanone), and RT 6.653min (4-hydroxybutyric acid).
The test result of the compound imidazoline corrosion inhibitor is as follows: according to the gas chromatography analysis result, the following steps are carried out: the samples contained RT ═ 9.17min (benzyl chloride intermediate), RT ═ 16.223min (1, 3-dibenzyloxy-2-propanol intermediate), RT ═ 10.002min (methyl benzoate intermediate), RT ═ 11.422min (1-phenyl-2-propenyl-1-one), RT ═ 12.191min (quinoline), RT ═ 15.958min (naphthylaminobenzene).
4. PY-GC-MS analysis:
imidazoline corrosion inhibitor test results: from the results of thermal cracking-mass spectrometry analysis, it can be seen that: the samples contained RT ═ 13min (formaldehyde), RT ═ 13.8min (ethylbenzene), RT ═ 13.9min (pyridines).
The test result of the compound imidazoline corrosion inhibitor is as follows: from the results of thermal cracking-mass spectrometry analysis, it can be seen that: the sample contained RT 2.43min (formaldehyde), RT 7.815min (isoquinoline), RT 11.34min, 11.58min (indole), RT 14.145min, 14.175min (pyridine).
5. X-ray fluorescence spectrum and mass spectrum analysis:
imidazoline corrosion inhibitor test results: the mixture exists Cl, S, C, O and H elements.
The test result of the compound imidazoline corrosion inhibitor is as follows: the mixture exists elements Cl, S, C, O and H.
From the test results 1-5, the following two corrosion inhibitor compositions were finally determined:
TABLE 3 analysis results of imidazoline corrosion inhibitor formulation components
TABLE 4 analysis results of the formulation components of the compound imidazoline corrosion inhibitor
| Component name | Mass percent/%) | Function of |
| Methanol | 13.0-14.0 | Solvent(s) |
| Ethanol | 3.0-4.0 | Solvent(s) |
| Propargyl alcohol | 6.0-7.0 | Corrosion inhibition |
| Quaternary ammonium salt of quinoline | 8.0-9.0 | Corrosion inhibition |
| Naphthylaminobenzene | 5.0-6.0 | Corrosion inhibition |
| Thiourea | 9.0-10.0 | Corrosion inhibition |
| Mannich base acidizing corrosion inhibitor | 3.0-4.0 | Corrosion inhibition |
| Benzyloxy glycidyl ether | 2.0-3.0 | Corrosion inhibition |
| Quaternary ammonium salts of phenylpyridines | 4.0-5.0 | Corrosion inhibition |
| Hydrochloric acid (37%) | 3.0-4.0 | / |
| Formaldehyde (I) | 0.3-0.5 | Monomer |
| 1-phenyl-2-propenyl-1-propanone | 0.3-0.5 | / |
| Water (W) | 40.0-41.0 | / |
The physical and chemical performance test evaluation is carried out on two kinds of diluted oil-soluble imidazoline corrosion inhibitors and compound imidazoline corrosion inhibitors which meet the standard, and the test results are shown in the following table:
TABLE 5 results of physical and chemical property tests
6. And (3) weight loss test:
a weight loss experiment is adopted to research the corrosion behavior of P110 steel under the working condition of underground corrosion of thick oil doped with thin oil in a Tahe oil field, and the corrosion inhibition performance of the imidazoline corrosion inhibitor and the compounded imidazoline corrosion inhibitor synthesized in a laboratory is evaluated. The experimental conditions are as follows: 130 deg.C, 0.2Mpa CO2，0.9Mpa H2S, 40% water60 percent of oil, and the adding concentration of the corrosion inhibitor is 300 ppm. The evaluation results are shown in the following table:
table 6 weight loss test
| Type of corrosion inhibitor | Time (h) | Corrosion Rate (mm/a) | Inhibition ratio (%) |
| Blank experiment | 168 | 0.6214 | / |
| Imidazoline corrosion inhibitor | 168 | 0.1824 | 70.6 |
| Compound imidazoline corrosion inhibitor | 168 | 0.0856 | 86.2 |
A weight loss test experiment is adopted to research the corrosion behavior of P110 steel under the working condition of corrosion of thick oil doped with thin oil in a Tahe oilfield, and the corrosion inhibition performance of imidazoline corrosion inhibitors and compound imidazoline corrosion inhibitors synthesized in a laboratory at 120 ℃, 130 ℃ and 140 ℃ is evaluated. The experimental conditions are as follows: 0.2MPa CO2，0.9Mpa H2S, 40% of water, 60%The filling concentration of oil and corrosion inhibitor is 300 ppm. The evaluation results were as follows:
TABLE 7 evaluation test results of temperature resistance adaptability of preferred corrosion inhibitor
The weight loss test result shows that the CO content is 0.2Mpa2、0.9Mpa H2S, under the condition of 40% water content and at the temperature of below 130 ℃, the compounded imidazoline corrosion inhibitor has good corrosion inhibition performance along with the rise of temperature, the corrosion inhibition rate is more than 80%, and although the imidazoline corrosion inhibitor has certain corrosion inhibition capability, the corrosion inhibition rate does not reach 80%; along with the rise of the temperature, the corrosion inhibition components of the two corrosion inhibitors gradually lose effectiveness, and the corrosion inhibition rate is gradually reduced.
8. And (3) testing alternating current impedance:
the test method comprises the following steps: electrochemical measurement is carried out after the corrosion potential of the sample is stabilized. The electrochemical impedance spectrum measurement adopts a potentiostat and a frequency response instrument. The amplitude of the alternating current excitation signal is 5mV, and the frequency interval is 100kHz-1 mHz. The measurement of electrochemical impedance spectroscopy is performed at the self-corrosion potential. The experimental conditions are as follows: 130 deg.C, 0.2MPa CO2，0.9Mpa H2S, 40% of water, 60% of oil and 300ppm of corrosion inhibitor filling concentration, and the evaluation results are as follows:
TABLE 8 AC impedance parameters for different corrosion inhibitor groups
According to the alternating-current impedance test result, the EIS curve added with the compound imidazoline corrosion inhibitor only has obvious high-frequency capacitive arc resistance, the high-frequency capacitive arc resistance radius is the largest, the corrosion inhibition effect of the compound imidazoline corrosion inhibitor is the best, the calculation shows that the corrosion inhibition efficiency of the compound imidazoline corrosion inhibitor reaches more than 80% when the concentration of the compound imidazoline corrosion inhibitor is 300ppm at the temperature of 130 ℃, and the corrosion inhibition effect is good.
Finally, it should be noted that the above-mentioned contents are only used for illustrating the technical solutions of the present invention, and do not limit the protection scope of the present invention, and those skilled in the art can make simple modifications or equivalent substitutions on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention.
Claims (10)
1. The high-temperature-resistant corrosion inhibitor for the water injection well of the oil field is characterized by comprising the following raw materials: imidazoline corrosion inhibitor, Mannich base acidification corrosion inhibitor, quinoline quaternary ammonium salt, hydrochloric acid, naphthylaminobenzene, benzyloxy glycidyl ether, potassium iodide and alcohol solvent.
2. The high-temperature-resistant corrosion inhibitor for the water injection well of the oil field according to claim 1, wherein the water content of the corrosion inhibitor is 40.0-48.0%.
3. The high temperature resistant corrosion inhibitor for oil field water injection well according to claim 1, wherein said alcohol solvent comprises methanol and ethanol.
4. A method for preparing the high-temperature-resistant corrosion inhibitor for the oilfield water injection well according to any one of claims 1 to 3, which is characterized by comprising the following steps:
(1) adding a mixed solution of imidazoline corrosion inhibitor, Mannich base acidizing corrosion inhibitor, quinoline quaternary ammonium salt and absolute ethyl alcohol into a reaction container, adjusting the pH value with hydrochloric acid, and uniformly stirring;
(2) then adding naphthylamino benzene and benzyloxy glycidyl ether;
(3) and (3) sequentially adding anhydrous methanol and potassium iodide into the reaction vessel, and uniformly stirring to obtain the compound imidazoline corrosion inhibitor, namely the high-temperature-resistant corrosion inhibitor for the oilfield water injection well.
5. The preparation method of the high temperature resistant corrosion inhibitor for the water injection well of the oil field according to claim 4, wherein the mass ratio of the imidazoline corrosion inhibitor, the Mannich base acidification corrosion inhibitor and the quinoline quaternary ammonium salt in the corrosion inhibitor in the step (1) is 1-1.2:1-1.2: 1.2-1.6.
6. The preparation method of the high temperature resistant corrosion inhibitor for the water injection well in the oil field according to claim 4, wherein the pH value in the step (1) is adjusted to 1-3.
7. The preparation method of the high-temperature-resistant corrosion inhibitor for the water injection well of the oil field according to claim 4, wherein the mass ratio of the addition amount of the naphthylamino benzene to the benzyloxy glycidyl ether in the step (2) is 1-1.3: 1-1.3.
8. The preparation method of the high temperature resistant corrosion inhibitor for the water injection well in the oil field according to claim 4, wherein the naphthalene aminobenzene and benzyloxy glycidyl ether are added in the step (2), and then the mixture is refluxed for 10 to 12 hours at the temperature of 70 to 100 ℃.
9. The preparation method of the high-temperature-resistant corrosion inhibitor for the water injection well of the oil field according to claim 4, wherein the mass ratio of the addition amount of the anhydrous methanol to the addition amount of the potassium iodide in the step (3) is 1-1.2: 1-1.3.
10. The preparation method of the high temperature resistant corrosion inhibitor for the water injection well in the oil field according to claim 4, wherein the stirring time in the step (3) is 7-10 min.
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| CN116770310B (en) * | 2023-06-16 | 2023-12-12 | 西安三环石油管材科技有限公司 | High-temperature acidification corrosion inhibitor for titanium-nickel alloy of thickening hydrochloric acid system, and preparation method and application thereof |
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