Disilane compound, preparation method and application thereof, composition and application thereof

Abstract

The invention relates to the field of oil extraction in oil fields, in particular to a disilane compound, a preparation method and application thereof, a composition and application thereof. The compound has a structure as shown in a formula (1): # imgabs0 #, wherein R1, R2 and R3 are respectively and independently selected from hydrogen and alkyl; a, b, c and d are natural numbers, and b and c are not 0 at the same time. The disilane compound with the structure has high hydrophobicity and toughness, the density of a silane film can be increased by combining the disilane compound with a monosilane compound, the barrier performance of the silane film is improved, and the purpose of long-term and efficient corrosion inhibition is achieved.

Description

Technical Field

[0001] The present invention relates to the field of oil production in oilfields, and particularly to a disilane compound, a preparation method and application thereof, a composition and an application thereof. Background Art

[0002] During oil and gas production, the corrosion of carbon steel pipes in pipelines causes serious economic losses, and thus has attracted the attention of the oil and gas production industry. The cracks and notches on the pipe wall caused by corrosion not only result in a large amount of crude oil loss, bringing economic losses, but also cause environmental pollution and lead to ecological disasters. There are many reasons for corrosion, but the main reason is the corrosion caused by CO 2 , which can occur in all pipelines from the bottom of the well to the wellhead and accompany the entire production process.

[0003] CO 2 corrosion is a complex electrochemical process. During the corrosion process, CO 2 has two functions. One is to increase the hydrogen content on the cathode; the other is to form carbonate deposits on the metal surface. The CO 2 corrosion process is affected by various factors and conditions (temperature, pH, CO 2 partial pressure, etc.). These factors cover pipeline materials, liquid components, and surrounding environmental factors.

[0004] Currently, common technical means for CO 2 anti-corrosion include: selecting corrosion-resistant metal pipes, protecting the pipe wall with a coating, increasing the pH value, adding corrosion inhibitors, gas dehydration, etc. Among them, injecting corrosion inhibitors is the most economical, convenient and applicable method. The corrosion inhibitor molecules reduce the corrosion rate by isolating the metal and the corrosive medium.

[0005] Organic coatings have the advantages of low cost and easy construction, and have become one of the most widely used metal anti-corrosion agents. Epoxy resins have the advantages of strong adhesion and good chemical reagent resistance, and are widely used as organic coatings for metal anti-corrosion. However, the disadvantage of epoxy coatings is their large water absorption, which limits their application. Summary of the Invention

[0006] The purpose of the present invention is to overcome the problems existing in the prior art that the anti-corrosion coating effect of CO 2 is not good and the coating is not resistant to pressure and is easy to peel off, and to provide a disilane compound, which has the characteristics of high hydrophobicity and toughness and is not easy to peel off due to pressure changes.

[0007] To achieve the above object, in the first aspect of the present invention, a disilane compound is provided, which is characterized in that the compound has the structure shown in formula (1):

[0008]

[0009] In formula (1), R1, R2, and R3 are each independently selected from hydrogen and alkyl; a, b, c, and d are natural numbers, and b and c are not both 0.

[0010] The second aspect of the present invention provides a method for preparing the compound described in the first aspect, the method comprising: under the conditions of a catalyst and a solvent, contacting and reacting a raw material containing the compound shown in formula (2) with a raw material containing the compound shown in formula (3);

[0011]

[0012] The third aspect of the present invention provides an application of the compound described in the first aspect in the preparation of a corrosion inhibitor.

[0013] The fourth aspect of the present invention provides a composition, the composition comprising the compound shown in formula (1) described in the first aspect and a monosilane compound.

[0014] The fifth aspect of the present invention provides an application of the composition described in the fourth aspect as a corrosion inhibitor in carbon dioxide enhanced oil recovery.

[0015] Through the above technical solutions, the present invention has the following advantages:

[0016] The disilane compound having the structure of the present invention has high hydrophobicity and toughness. Combining the disilane compound with a monosilane compound can increase the density of the silane film and improve the barrier performance of the silane film, achieving the purpose of long-term and efficient corrosion inhibition. Detailed implementation manners

[0017] In the ranges disclosed herein, the endpoints and any values are not limited to the exact ranges or values, and these ranges or values should be understood to include values close to these ranges or values. For numerical ranges, between the endpoint values of each range, between the endpoint values of each range and individual point values, and between individual point values, they can be combined with each other to obtain one or more new numerical ranges, and these numerical ranges should be regarded as specifically disclosed herein.

[0018] The present invention provides a disilane compound, the compound having the structure shown in formula (1):

[0019]

[0020] In formula (1), R 1 , R 2 , R 3 are each independently selected from hydrogen and alkyl; a, b, c, and d are natural numbers, and b and c are not both 0.

[0021] The disilane compound having the structure of the present invention has high hydrophobicity and toughness.

[0022] According to a preferred embodiment of the present invention, in the formula (1), R 1 , R 2 , R 3 are each independently selected from hydrogen and C1-C8 alkyl groups.

[0023] According to a preferred embodiment of the present invention, in the formula (1), a is 0-20, preferably 0-4; b is 0-20, preferably 1-8; c is 0-10, preferably 0-4; d is 0-20, preferably 0-4.

[0024] The present invention provides a method for preparing the compound, which method comprises: under the conditions of a catalyst and a solvent, contacting a raw material containing the compound shown in formula (2) with a raw material containing the compound shown in formula (3) for reaction;

[0025]

[0026]

[0027] According to a preferred embodiment of the present invention, the catalyst is a noble metal catalyst, preferably a platinum catalyst, more preferably chloroplatinic acid and / or cis-diammineplatinum dichloride.

[0028] According to a preferred embodiment of the present invention, the conditions for the contacting reaction include: reacting under an inert atmosphere, preferably reacting under a nitrogen atmosphere.

[0029] According to a preferred embodiment of the present invention, the conditions for the contacting reaction include: the temperature is 50-150 °C.

[0030] According to a preferred embodiment of the present invention, the conditions for the contacting reaction include: the reaction time is 2-24 h, preferably 6-12 h.

[0031] According to a preferred embodiment of the present invention, the conditions for the contacting reaction include: the molar ratio of the raw material containing the compound shown in formula (3) based on the compound shown in formula (3), the raw material containing the compound shown in formula (2) based on the compound shown in formula (2), and the catalyst based on the total amount of noble metal elements is 1:2-4:0.001-0.05.

[0032] Before the contacting reaction in the present invention, an activation treatment is also required, specifically, heating the mixture containing formula (3), the catalyst and the solvent to 50-80 °C for activation for 0.3-1 h.

[0033] The preparation method of the present invention further comprises: after the contacting reaction is completed, separating the catalyst from the reaction mixture, and removing the solvent and impurities in an optional order to obtain the product.

[0034] The separation method can be a conventional choice in the art. According to a preferred embodiment of the present invention, the separation method is washing and filtration.

[0035] The method for removing the solvent can be a conventional choice in the art. According to a preferred embodiment of the present invention, the method for removing the solvent is extraction and rotary evaporation.

[0036] The method for removing impurities can be a conventional choice in the art. According to a preferred embodiment of the present invention, the method for removing impurities is filtration.

[0037] The present invention provides an application of the compound in the preparation of a corrosion inhibitor, preferably in the preparation of a corrosion inhibitor for carbon dioxide flooding.

[0038] The present invention provides a composition, which comprises a compound represented by formula (1) and a monosilane compound.

[0039] According to a preferred embodiment of the present invention, the monosilane compound has the structure represented by formula (4):

[0040]

[0041] In formula (4), R 4 , R 5 , R 6 are each independently selected from hydrogen and C1-C8 alkyl groups; X is a halogen, preferably F; e is an integer from 0 to 20, preferably an integer from 3 to 9.

[0042] According to a preferred embodiment of the present invention, the molar ratio of the compound represented by formula (1) to the monosilane compound in the composition is 1:1-10, preferably 1:2-4.

[0043] The present invention provides an application of the composition as a corrosion inhibitor in carbon dioxide flooding.

[0044] Combining the disilane compound of the present invention with the monosilane compound can increase the density of the silane film and improve the barrier performance of the silane film, achieving the purpose of long-term and efficient corrosion inhibition.

[0045] There is no special requirement for the use method of the composition in the present invention. When the disilane compound and the monosilane compound are fed separately: first coat the disilane compound on the substance to be modified and then coat the monosilane compound; when fed simultaneously: mix the disilane compound and the monosilane compound to prepare a solution with a mass concentration of 0.1%-10% as the coating agent.

[0046] The present invention will be described in detail below through examples. Unless otherwise specified, the raw materials are all commercially available products.

[0047] Example 1

[0048] N 2 Under protection, a certain amount of Compound 1A (100 mmol) and an isopropanol solution of chloroplatinic acid (wherein, chloroplatinic acid is 0.1 mmol) were added to a dry three-necked flask, stirred, heated to 80 °C, activated for 30 min, and then Compound 1B (250 mmol) was added dropwise, and the temperature was slowly raised to 120 °C, and the reaction was carried out for 8 h. After the reaction was completed, the reaction solution was washed with water to remove chloroplatinic acid and isopropanol, the organic phase was extracted with petroleum ether and dried with anhydrous MgSO 4 It was dried for 12 h, and then the petroleum ether was removed by distillation under reduced pressure to obtain disilane S1.

[0049] Example 2

[0050] N 2 Under protection, a certain amount of Compound 2A (100 mmol) and an isopropanol solution of chloroplatinic acid (wherein, chloroplatinic acid is 0.1 mmol) were added to a dry three-necked flask, stirred, heated to 60 °C, activated for 30 min, and then Compound 2B (400 mmol) was added dropwise, and the temperature was slowly raised to 150 °C, and the reaction was carried out for 10 h. After the reaction was completed, the reaction solution was washed with water to remove chloroplatinic acid and isopropanol, the organic phase was extracted with petroleum ether and dried with anhydrous MgSO 4 It was dried for 12 h, and then the petroleum ether was removed by distillation under reduced pressure to obtain disilane S2.

[0051] Example 3

[0052] N 2 Under protection, a certain amount of Compound 3A (100 mmol) and an isopropanol solution of chloroplatinic acid (wherein, chloroplatinic acid is 0.1 mmol) were added to a dry three-necked flask, stirred, heated to 80 °C, activated for 30 min, and then Compound 3B (400 mmol) was added dropwise, and the temperature was slowly raised to 140 °C, and the reaction was carried out for 10 h. After the reaction was completed, the reaction solution was washed with water to remove chloroplatinic acid and isopropanol, the organic phase was extracted with petroleum ether and dried with anhydrous MgSO 4 It was dried for 12 h, and then the petroleum ether was removed by distillation under reduced pressure to obtain disilane S3.

[0053] Example 4

[0054] Stainless steel sheet coating experiment:

[0055] Solutions of Example 1 and monosilane G4 were respectively prepared into 1 wt% solutions, and after equal-volume mixing, the solution was hydrolyzed at 50 °C for 24 h. Then, the stainless steel sheet was put into the silane solution, and after a few seconds, it could be taken out, dried, and cured to obtain the coated stainless steel sheet 4.

[0056] Example 5

[0057] Stainless steel sheet coating experiment:

[0058] Prepare 1 wt% solutions of Example 2 and monosilane G5 respectively. After hydrolyzing the solution obtained by mixing equal volumes at 50 °C for 24 h, immerse a stainless steel sheet into the silane solution. After several seconds, take it out, dry it, and cure it to obtain the coated stainless steel sheet 5.

[0059] Example 6

[0060] Prepare 1 wt% solutions of Example 3 and monosilane G6 respectively. After hydrolyzing the solution obtained by mixing equal volumes at 50 °C for 24 h, immerse a stainless steel sheet into the silane solution. After several seconds, take it out, dry it, and cure it to obtain the coated stainless steel sheet 6.

[0061] Example 7

[0062] Corrosion resistance experiment of stainless steel sheet:

[0063] Refer to SY / T 5405-1996 for the determination conditions of high-temperature and high-pressure dynamic corrosion rate and the evaluation index of corrosion inhibitors, and conduct corrosion resistance experiments on stainless steel sheets 4, 5, 6 and the untreated stainless steel sheet. It can be seen by comparison that under the given conditions, the corrosion rates of the treated stainless steel sheets are all lower than that of the untreated stainless steel sheet, indicating that this corrosion inhibitor formulation has excellent corrosion inhibition effect in high-temperature, high-pressure, high hydrogen sulfide and CO 2 environment.

[0064] In Examples 1-6 and Comparative Example 2, the compounds used are shown in Table 1:

[0065] Table 1

[0066]

[0067]

[0068] The structures of compounds A, B and monosilane are as follows:

[0069] Table 2 Statistical table of evaluation results of slow-release performance of stainless steel sheets

[0070]

[0071] Comparative Example 1

[0072] Evaluate the corrosion inhibitor prepared in Example 1 of CN105152991A. Similarly, referring to the SY / T 5405-1996 standard, the corrosion rate of sulfur-resistant steel for oil pipes is measured to be 15-32 g / m 2 .h, which is much higher than the corrosion rate of the present invention.

[0073] Comparative Example 2

[0074] Prepare disilanes with the structure shown in Table 1. Using the same experimental method as in Experimental Example 4, obtain a stainless steel sheet after coating, and test the corrosion resistance of the steel sheet. At 90 °C, H 2 S 3 MPa, CO 2 The corrosion rate is significantly worse than that of the disilanes S1-S3 of the present invention under 4 MPa, and the corrosion rate is above 15 g / m 2 .h.

[0075] The preferred embodiments of the present invention have been described in detail above. However, the present invention is not limited thereto. Within the scope of the technical concept of the present invention, various simple modifications can be made to the technical solutions of the present invention, including any other suitable combination of each technical feature. These simple modifications and combinations should also be regarded as the content disclosed by the present invention and fall within the protection scope of the present invention.

Claims

1. A disilane compound, characterized in that the compound has the structure shown in formula (1): In formula (1), R 1 , R 2 , R 3 are each independently selected from hydrogen and alkyl; a, b, c, and d are natural numbers, and b and c are not both 0 at the same time.

2. The compound according to claim 1, wherein in the formula (1), R 1 、R 2 、R 3 are each independently selected from hydrogen and C1-C8 alkyl; and / or a is 0 - 20, preferably 0 - 4; b is 0 - 20, preferably 1 - 8; c is 0 - 10, preferably 0 - 4; d is 0 - 20, preferably 0 - 4.

3. A method for preparing the compound according to claim 1 or 2, characterized in that the method comprises: under the conditions of a catalyst and a solvent, contacting and reacting a raw material containing a compound shown in formula (2) with a raw material containing a compound shown in formula (3); 4. The preparation method according to claim 3, wherein the catalyst is a noble metal catalyst, preferably a platinum catalyst, more preferably chloroplatinic acid and / or cis - diamineplatinum dichloride.

5. The preparation method according to claim 3 or 4, wherein the conditions of the contacting reaction include: reacting under an inert atmosphere, preferably reacting under a nitrogen atmosphere; and / or the temperature is 50 - 150 °C; and / or the reaction time is 2 - 24 h, preferably 6 - 12 h; and / or the molar ratio of the raw material containing the compound shown in formula (3), based on the compound shown in formula (3), the raw material containing the compound shown in formula (2), based on the compound shown in formula (2), and the catalyst, based on the total amount of noble metal elements, is 1:2 - 4:0.001 - 0.

05.

6. The application of the compound according to claim 1 or 2 in the preparation of a corrosion inhibitor, preferably in the preparation of a corrosion inhibitor for carbon dioxide flooding oil recovery.

7. A composition, characterized in that the composition contains the compound shown in formula (1) described in claim 1 or 2 and a monosilane compound.

8. The composition according to claim 7, wherein the monosilane compound has the structure shown in formula (4): In formula (4), R 4 , R 5 , R 6 are each independently selected from hydrogen and C1-C8 alkyl groups; X is a halogen, preferably F; e is an integer from 0 to 20, preferably an integer from 3 to 9.

9. The composition according to claim 7 or 8, wherein the molar ratio of the compound shown in formula (1) to the monosilane compound in the composition is 1:1 - 10, preferably 1:2 - 4.

10. The application of the composition according to any one of claims 7 - 9 as a corrosion inhibitor in carbon dioxide flooding oil recovery.

Images