Compound, preparation method thereof, corrosion inhibition composition containing compound and well completion fluid

Abstract

The invention provides a compound, a preparation method thereof, a corrosion inhibition composition containing the compound and a completion fluid. The structural formula of the compound is shown as a formula I: # imgabs0 #, wherein R is a C-C bond, methylene or ethylene; r'is a benzyl group or-CH2-COONa; m < + > is Na < + > or K < + >; x is an integer from 0 to 20; y is an integer from 0 to 20; and z is an integer from 0 to 20. The corrosion inhibition composition is obtained by compounding the compound, a nonionic surfactant and low alcohol, the completion fluid is obtained by compounding the corrosion inhibition composition, organic acid salt, a bactericide, a stabilizer and water, and the completion fluid is high in adjustable density, uniform, stable and good in corrosion inhibition and can be used for corrosion prevention of CO2 in high-temperature oil and gas wells.

Description

Technical Field

[0001] The present invention belongs to high temperature oil and gas well CO 2 The technical field of corrosion prevention particularly relates to a compound, a preparation method thereof, and a corrosion inhibition composition and completion fluid containing the compound. Background Art

[0002] Corrosion protection is an important issue that cannot be ignored in the completion process of high-temperature oil and gas wells. 2 In addition to the preferred anti-CO 2 Outside the pipe, add high temperature anti-CO 2 Corrosion inhibitors and high-density completion fluids containing them are an important, economical and effective approach.

[0003] At present, completion fluid systems at home and abroad have poor high-temperature corrosion inhibition performance and high-temperature CO resistance. 2 Problems include poor corrosion inhibition performance, low adjustable density, poor solubility of corrosion inhibitors in high-density completion fluids, and difficulty in formulating a uniform and stable corrosion protection completion fluid system. Summary of the invention

[0004] The first aspect of the present invention provides a compound, the structural formula of which is shown in Formula I:

[0005]

[0006] Wherein, R is a C—C bond, a methylene group or an ethylene group; R' is a benzyl group or a -CH 2 -COONa;M + for Na + or K + ; x is an integer from 0 to 20; y is an integer from 0 to 20; z is an integer from 0 to 20;

[0007] Preferably, x is an integer from 0 to 2; y is an integer from 0 to 2; z is 2;

[0008] Preferably, x, y, z are 0, 0, 2, respectively; or

[0009] x, y, z are 2, 1, 2 respectively; or

[0010] x, y, and z are all 2.

[0011] The second aspect of the present invention provides a method for preparing the compound according to the first aspect of the present invention, comprising the following steps:

[0012] 1) allowing a dibasic organic carboxylic acid and a polyamine to undergo a first reaction to obtain a first reaction product;

[0013] 2) subjecting the first reaction product to a second reaction to obtain a second reaction product;

[0014] 3) React the second reaction product with a quaternizing agent to carry out a third reaction to obtain an imidazoline quaternary salt intermediate;

[0015] 4) React the imidazoline quaternary salt intermediate with a hydroxide to carry out a fourth reaction to obtain the compound.

[0016] According to a specific embodiment of the present invention, the molar ratio of the dibasic organic carboxylic acid to the polyamine is 1:(1 to 1.5); and / or

[0017] the molar ratio of the polyamine to the quaternizing agent is (1 to 1.05):(1.05 to 1.2); and / or

[0018] the molar ratio of the polyamine to the hydroxide is 1:(1 to 1.5).

[0019] According to a specific embodiment of the present invention, the dibasic organic carboxylic acid is selected from oxalic acid, malonic acid or succinic acid; and / or

[0020] the polyamine is selected from at least one of diethylenetriamine, triethylenetetramine, tetraethylenepentamine and polyethylenepolyamine;

[0021] and / or

[0022] the quaternizing agent is benzyl chloride or sodium chloroacetate; and / or

[0023] the hydroxide is potassium hydroxide or sodium hydroxide.

[0024] According to a specific embodiment of the present invention, in step 1), the first reaction is a gradient temperature rising reflux reaction;

[0025] Preferably, in step 1), the process of the gradient temperature rising reflux reaction is to reflux at 110 to 150 °C for 1 to 2 h, and then raise the temperature to 140 to 180 °C and reflux for 3 to 6 h; and / or

[0026] In step 2), the conditions of the second reaction are to reflux at 220 to 280 °C for 3 to 6 h; and / or

[0027] In step 3), the conditions of the third reaction are to react at 150 to 160 °C for 4 to 6 h; and / or

[0028] In step 4), first cool down to 70 to 100 °C and add the hydroxide, and then carry out the fourth reaction;

[0029] and / or

[0030] the conditions of the fourth reaction are to react at 100 to 150 °C for 3 to 6 h;

[0031] Preferably, in step 1), the process of the gradient temperature rise and reflux reaction is to reflux at 110 to 135 °C for 1 to 1.8 h, and then heat up to 140 to 170 °C and reflux for 3 h; and / or

[0032] In step 2), the conditions of the second reaction are to reflux at 260 °C for 3 to 6 h; and / or

[0033] In step 4), first cool down to 70 to 90 °C and add the hydroxide, and then carry out the fourth reaction;

[0034] and / or

[0035] The conditions of the fourth reaction are to react at 100 to 145 °C for 3 to 5 h.

[0036] The compound prepared by the method described in the second aspect of the present invention can be directly used without purification.

[0037] The third aspect of the present invention provides a corrosion inhibitor composition, which includes a first compound, a second compound, a non-ionic surfactant, and a lower alcohol;

[0038] The first compound is the compound described in the first aspect of the present invention or the compound prepared by the method described in the second aspect of the present invention, wherein R' is benzyl;

[0039] The second compound is the compound described in the first aspect of the present invention or the compound prepared by the method described in the second aspect of the present invention, wherein R' is -CH 2 -COONa.

[0040] According to a specific embodiment of the present invention, taking the mass of the corrosion inhibitor composition as 100%, the corrosion inhibitor composition includes 69 wt% to 89.5 wt% of the first compound and the second compound in total, 0.5 wt% to 1 wt% of the non-ionic surfactant, and 10 wt% to 30 wt% of the lower alcohol; and / or

[0041] The mass ratio of the first compound to the second compound is 1:(1 to 1.5);

[0042] Preferably, the non-ionic surfactant is alkylphenol polyoxyethylene ether;

[0043] Preferably, the alkylphenol polyoxyethylene ether is nonylphenol polyoxyethylene ether and / or octylphenol polyoxyethylene ether;

[0044] Preferably, the alkylphenol polyoxyethylene ether is selected from at least one of NP-10, NP-15, OP-10, and OP-15;

[0045] Preferably, the lower alcohol is at least one of methanol, ethanol, and isopropyl alcohol.

[0046] The fourth aspect of the present invention provides a completion fluid, which includes a corrosion inhibitor composition, an organic acid salt, a bactericide, a stabilizer, and water;

[0047] The corrosion inhibitor composition is the corrosion inhibitor composition described in the third aspect of the present invention.

[0048] According to a specific embodiment of the present invention, taking the mass of the completion fluid as 100%, the completion fluid includes 1 wt% to 2 wt% of the corrosion inhibitor composition, 20 wt% to 60 wt% of the organic acid salt, 0.5 wt% to 1 wt% of the bactericide, 1 wt% to 2 wt% of the stabilizer, and 37.5 wt% to 75.5 wt% of water;

[0049] Preferably, the organic acid salt is formate (such as potassium formate and / or sodium formate); and / or

[0050] The bactericide is bactericide 1227 and / or isothiazolinone; and / or

[0051] The stabilizer is at least one of HEDP(4Na), ATMP(2Na), and EDTA(4Na).

[0052] The application of any one of the compound described in the first aspect of the present invention, the compound prepared by the method described in the second aspect of the present invention, the corrosion inhibitor composition described in the third aspect of the present invention, and the completion fluid described in the fourth aspect of the present invention in high-temperature oil and gas well CO 2 anti-corrosion;

[0053] Preferably, the high temperature is not higher than 120 °C.

[0054] The beneficial effects of the present invention:

[0055] Aiming at the problems in the existing completion fluid system, such as poor corrosion resistance with temperature difference, poor high-temperature CO 2 corrosion inhibition performance, low adjustable density, the corrosion inhibitor is difficult to dissolve in high-density completion fluid, and it is difficult to prepare a uniform and stable corrosion protection completion fluid system, the present invention provides a compound, its preparation method, and a corrosion inhibitor composition and a completion fluid containing it. Through the structural design of the compound, the inventor makes the compound have good solubility and good corrosion inhibition in the completion fluid, and has strong anti-CO 2 corrosion. In formula I, R' is -CH 2The compound with -COONa, the compound with R' being -benzyl in Formula I, a non-ionic surfactant, and a lower alcohol are compounded to obtain the corrosion inhibitor composition, and then the corrosion inhibitor composition is further compounded with an organic acid salt, a bactericide, a stabilizer, and water to obtain the completion fluid. In the completion fluid, the compound with -COONa and the compound with R' being -benzyl in Formula I have a synergistic effect, enhancing the corrosion inhibition performance of the completion fluid. The completion fluid has good stability, a high adjustable density, and good corrosion inhibition performance. Using the completion fluid provided by the present invention as the corrosion medium after introducing carbon dioxide, the single-metal corrosion rate is measured at 60 °C, 90 °C, and 120 °C: the corrosion rates of the single-metal electrodes of TP110SS material are 0.03 to 0.034 mm / a (60 °C), 0.042 to 0.05 mm / a (90 °C), and 0.044 to 0.114 mm / a (120 °C); the corrosion rates of the single-metal electrodes of 718 material are 0.026 to 0.03 mm / a (60 °C), 0.029 to 0.041 mm / a (90 °C), and 0.039 to 0.045 mm / a (120 °C); the corrosion rates of the single-metal electrodes of 825 material are 0.010 to 0.022 mm / a (60 °C), 0.015 to 0.03 mm / a (90 °C), and 0.025 to 0.034 mm / a (120 °C); using the completion fluid provided by the present invention as the corrosion medium after introducing carbon dioxide, the galvanic corrosion rate is measured at 120 °C: the corrosion rates of the galvanic couples composed of TP110SS + 718 with an area ratio of 2:1, TP110SS + 825 with an area ratio of 2:1, and TP110SS + G3 with an area ratio of 2:1 are 0.035 to 0.062 mm / a, 0.031 to 0.04 mm / a, and 0.007 to 0.011 mm / a, respectively. No pitting corrosion phenomenon occurs for the single-metal electrodes and galvanic couples during the above experiments. It shows that the completion fluid provided by the present invention has good corrosion inhibition performance against CO 2 The compound with -COONa and the compound with R' being -benzyl in Formula I have a synergistic effect, enhancing the corrosion inhibition performance of the completion fluid. The completion fluid has good stability, a high adjustable density, and good corrosion inhibition performance. Using the completion fluid provided by the present invention as the corrosion medium after introducing carbon dioxide, the single-metal corrosion rate is measured at 60 °C, 90 °C, and 120 °C: the corrosion rates of the single-metal electrodes of TP110SS material are 0.03 to 0.034 mm / a (60 °C), 0.042 to 0.05 mm / a (90 °C), and 0.044 to 0.114 mm / a (120 °C); the corrosion rates of the single-metal electrodes of 718 material are 0.026 to 0.03 mm / a (60 °C), 0.029 to 0.041 mm / a (90 °C), and 0.039 to 0.045 mm / a (120 °C); the corrosion rates of the single-metal electrodes of 825 material are 0.010 to 0.022 mm / a (60 °C), 0.015 to 0.03 mm / a (90 °C), and 0.025 to 0.034 mm / a (120 °C); using the completion fluid provided by the present invention as the corrosion medium after introducing carbon dioxide, the galvanic corrosion rate is measured at 120 °C: the corrosion rates of the galvanic couples composed of TP110SS + 718 with an area ratio of 2:1, TP110SS + 825 with an area ratio of 2:1, and TP110SS + G3 with an area ratio of 2:1 are 0.035 to 0.062 mm / a, 0.031 to 0.04 mm / a, and 0.007 to 0.011 mm / a, respectively. No pitting corrosion phenomenon occurs for the single-metal electrodes and galvanic couples during the above experiments. It shows that the completion fluid provided by the present invention has good corrosion inhibition performance against CO 2 corrosion and can be used for the anti-corrosion of high-temperature oil and gas wells with CO 2 of. BRIEF DESCRIPTION OF THE DRAWINGS

[0056] Figure 1 It is the infrared spectrogram of the crude product of the compound prepared in Example 3. DETAILED DESCRIPTION OF THE INVENTION

[0057] The present invention will be further described below in conjunction with the embodiments, but the embodiments of the present invention are only exemplary descriptions, and this implementation manner does not constitute a limitation to the present invention under any circumstances.

[0058] Preparation of the compound

[0059] Example 1

[0060] Add oxalic acid and diethylenetriamine with a molar ratio of 1.0:1.1 into the reactor, heat up to 110 °C under stirring conditions. At this time, a liquid is separated out, and reflux is maintained for 1 h; then heat up to 140 °C and reflux for 3 h for amidation reaction; continue to heat up to 260 °C and reflux for 3 h for cyclization reaction; cool down to 150 °C, add benzyl chloride (the molar ratio of diethylenetriamine to benzyl chloride is 1:1), and react for 4 h to obtain an imidazoline quaternary ammonium salt intermediate.

[0061] Cool the temperature to 70 °C, add sodium hydroxide (the molar ratio of diethylenetriamine to sodium hydroxide is 1.0:1.5), then heat up to 100 °C and continue to react for 3 h to obtain a brownish-yellow homogeneous viscous liquid, which is the crude product of the compound shown in Formula I (R is a C-C bond, R' is a benzyl group, M + is Na + , x is 0, y is 0, and z is 2).

[0062] Example 2

[0063] Add malonic acid and triethylenetetramine with a molar ratio of 1.0:1.1 into the reactor, heat up to 120 °C under stirring conditions. At this time, a liquid is separated out, and reflux is maintained for 1.4 h; then heat up to 160 °C and reflux for 3 h for amidation reaction; continue to heat up to 260 °C and reflux for 4.5 h for cyclization reaction; cool down to 155 °C, add sodium chloroacetate (the molar ratio of triethylenetetramine to sodium chloroacetate is 1.0:1.2), and react for 5 h to obtain an imidazoline quaternary ammonium salt intermediate.

[0064] Cool the temperature to 85 °C, add sodium hydroxide (the molar ratio of triethylenetetramine to sodium hydroxide is 1.0:1.5), then heat up to 130 °C and continue to react for 4 h to obtain a brownish-yellow homogeneous viscous liquid, which is the crude product of the compound shown in Formula I (R is a methylene group, R' is -CH 2 -COONa, M + is Na + , x is 2, y is 1, and z is 2).

[0065] Example 3

[0066] Add succinic acid and tetraethylenepentamine with a molar ratio of 1.0:1.5 into the reactor, heat up to 135 °C under stirring conditions. At this time, a liquid is separated out, and reflux is maintained for 1.8 h; then heat up to 170 °C and reflux for 3 h for amidation reaction; continue to heat up to 260 °C and reflux for 6 h for cyclization reaction; cool down to 160 °C, add sodium chloroacetate (the molar ratio of tetraethylenepentamine to sodium chloroacetate is 1.0:1.2), and react for 6 h to obtain an imidazoline quaternary ammonium salt intermediate.

[0067] Lower the temperature to 90 °C, add potassium hydroxide (the molar ratio of tetraethylenepentamine to potassium hydroxide is 1.0:1.1), then raise the temperature to 145 °C and continue the reaction for 5 h to obtain a brownish-yellow homogeneous viscous liquid, which is the crude product of the compound shown by the structural formula as in Formula I (R is ethylene, R' is -CH 2 -COONa, M + is K + , x is 2, y is 2, z is 2).

[0068] Compound structure characterization

[0069] Measure the infrared spectrum of the crude products of the compounds prepared in Examples 1 to 3 (i.e., the brownish-yellow homogeneous viscous liquid). Here, Example 3 is taken as an example for analysis.

[0070] Figure 1 The infrared spectrum of the brownish-yellow homogeneous viscous liquid prepared in Example 3. It can be seen from the infrared spectrum that: the stretching vibration peak of the carboxyl group appears at 3431 cm -1 The C=O stretching vibration of the free carboxylic acid is located at ~1714 cm -1 at, and the characteristic peak of imidazoline is at 1637 cm -1 , indicating that the brownish-yellow homogeneous viscous liquid prepared in Example 3 contains the compound shown by the structural formula as in Formula I, which is the crude product of the compound shown by the structural formula as in Formula I.

[0071] Measure the infrared spectrum of the brownish-yellow homogeneous viscous liquid prepared in Example 2, and the characteristic peaks of the carboxyl group, free carboxyl group and imidazoline can also be observed. The brownish-yellow homogeneous viscous liquid prepared in Example 2 contains the compound shown by the structural formula as in Formula I, which is the crude product of the compound shown by the structural formula as in Formula I.

[0072] Measure the infrared spectrum of the brownish-yellow homogeneous viscous liquid prepared in Example 1, and the characteristic peaks of the carboxyl group, imidazoline and benzyl group can be observed. The brownish-yellow homogeneous viscous liquid prepared in Example 1 contains the compound shown by the structural formula as in Formula I, which is the crude product of the compound shown by the structural formula as in Formula I.

[0073] Prepare the corrosion inhibitor composition

[0074] Example 4

[0075] The corrosion inhibitor composition provided in this example includes 79 wt% (the crude products of the compounds prepared in Example 1 and Example 2 with a mass ratio of 1:1), 1 wt% OP-10 and 20 wt% methanol; mix all the above components and stir evenly to obtain the corrosion inhibitor composition.

[0076] Example 5

[0077] The corrosion inhibitor composition provided in this example comprises 89.5 wt% (crude products of the compound prepared in Example 1 and the compound prepared in Example 3 with a mass ratio of 1:1.25), 0.5 wt% OP-15, and 10 wt% methanol; all the above components are mixed and stirred evenly to obtain the corrosion inhibitor composition.

[0078] Example 6

[0079] The corrosion inhibitor composition provided in this example comprises 69.2 wt% (crude products of the compound prepared in Example 1, the compound prepared in Example 2, and the compound prepared in Example 3 with a mass ratio of 1:0.75:0.75), 0.5 wt% NP-10, 0.3 wt% NP-15, and 30 wt% methanol; all the above components are mixed and stirred evenly to obtain the corrosion inhibitor composition.

[0080] Formulating completion fluid

[0081] The bactericide 1227 used in Examples 7, 9, Comparative Examples 1, 3, 6, 7, and 8: CAS No. is 139-07-1, purchased from Shandong Aike Water Treatment Technology Co., Ltd., and its main component is dodecyl dimethyl benzyl ammonium chloride.

[0082] The quinoline quaternary ammonium salt corrosion inhibitor used in Comparative Example 1 is specifically quinoline benzyl chloride quaternary ammonium salt, purchased from Wuhan HanYi Petroleum Technology Co., Ltd.

[0083] The oleic acid imidazoline corrosion inhibitor used in Comparative Example 2 is specifically vegetable oil acid tetraethylene pentamine imidazoline corrosion inhibitor, purchased from Wuhan HanYi Petroleum Technology Co., Ltd.

[0084] The tall oil imidazoline corrosion inhibitor used in Comparative Example 3 is specifically tall oil acid tetraethylene pentamine imidazoline corrosion inhibitor, purchased from Wuhan HanYi Petroleum Technology Co., Ltd.

[0085] Example 7

[0086] The completion fluid provided in this example comprises 2 wt% of the corrosion inhibitor composition prepared in Example 4, 20 wt% sodium formate, 0.5 wt% bactericide 1227, 2.0 wt% stabilizer ATMP(2Na), and 75.5 wt% water.

[0087] Example 8

[0088] The completion fluid provided in this example comprises 2 wt% of the corrosion inhibitor composition prepared in Example 5, 40 wt% sodium formate, 1 wt% bactericide isothiazolinone, 2.0 wt% stabilizer HEDP(4Na), and 55 wt% water.

[0089] Example 9

[0090] The completion fluid provided in this embodiment comprises 1 wt% of the corrosion inhibitor composition prepared in Example 6, 60 wt% of potassium formate, 0.5 wt% of bactericide 1227, 1.0 wt% of stabilizer EDTA(4Na), and 37.5 wt% of water.

[0091] Comparative Example 1

[0092] The completion fluid provided in this comparative example comprises 2 wt% of quinoline quaternary ammonium salt corrosion inhibitor, 20 wt% of sodium formate, 0.5 wt% of bactericide 1227, 2.0 wt% of stabilizer ATMP(2Na), and 75.5 wt% of water.

[0093] Comparative Example 2

[0094] The completion fluid provided in this comparative example comprises 2 wt% of oleic acid imidazoline corrosion inhibitor, 40 wt% of sodium formate, 1 wt% of bactericide isothiazolinone, 2.0 wt% of stabilizer HEDP(4Na), and 55 wt% of water.

[0095] Comparative Example 3

[0096] The completion fluid provided in this comparative example comprises 1 wt% of tall oil imidazoline corrosion inhibitor, 60 wt% of potassium formate, 0.5 wt% of bactericide 1227, 1.0 wt% of stabilizer EDTA(4Na), and 37.5 wt% of water.

[0097] Comparative Example 4

[0098] Oleic acid and triethylenetetramine with a molar ratio of 1.0:1.1 were added to the reactor, and the temperature was raised to 120 °C under stirring conditions. At this time, a liquid separated out, and reflux was maintained for 1.4 h; then the temperature was raised to 160 °C, and reflux was carried out for 3 h for amidation reaction; the temperature was further raised to 260 °C and refluxed for 4.5 h for cyclization reaction; the temperature was lowered to 155 °C, and sodium chloroacetate (the molar ratio of triethylenetetramine to sodium chloroacetate was 1.0:1.2) was added, and the reaction was carried out for 5 h to obtain an imidazoline quaternary ammonium salt intermediate;

[0099] The temperature was lowered to 85 °C, sodium hydroxide (the molar ratio of triethylenetetramine to sodium hydroxide was 1.0:1.5) was added, and then the temperature was raised to 130 °C, and the reaction was continued for 4 h to obtain a brownish-yellow homogeneous viscous liquid, which was the crude product of the compound shown in Structural Formula II.

[0100]

[0101] Comparative Example 5

[0102] Oleic acid and diethylenetriamine with a molar ratio of 1.0:1.1 were added to the reactor, and the temperature was raised to 110 °C under stirring conditions. At this time, a liquid was separated out, and reflux was maintained for 1 h; then the temperature was raised to 140 °C, and reflux was carried out for 3 h for amidation reaction; the temperature was further raised to 260 °C and refluxed for 3 h for cyclization reaction; the temperature was lowered to 150 °C, and benzyl chloride (the molar ratio of diethylenetriamine to benzyl chloride was 1:1) was added, and the reaction was carried out for 4 h to obtain an imidazoline quaternary ammonium salt intermediate;

[0103] The temperature was lowered to 70 °C, sodium hydroxide (the molar ratio of diethylenetriamine to sodium hydroxide was 1.0:1.5) was added, and then the temperature was raised to 100 °C, and the reaction was continued for 3 h to obtain a brownish-yellow homogeneous viscous liquid, which was the crude product of the compound shown in Structural Formula III.

[0104]

[0105] Comparative Example 6

[0106] Prepare a corrosion inhibitor composition: Replace the crude product of the compound prepared in Example 2 used in Example 4 with an equal mass of the crude product of the compound prepared in Comparative Example 4, and the others are the same as in Example 4;

[0107] Prepare a completion fluid: Replace the corrosion inhibitor composition prepared in Example 4 used in Example 7 with an equal mass of the corrosion inhibitor composition prepared in this comparative example, and the others are the same as in Example 7.

[0108] Comparative Example 7

[0109] Prepare a corrosion inhibitor composition: Replace the crude product of the compound prepared in Example 1 used in Example 4 with an equal mass of the crude product of the compound prepared in Comparative Example 5, and the others are the same as in Example 4;

[0110] Prepare a completion fluid: Replace the corrosion inhibitor composition prepared in Example 4 used in Example 7 with an equal mass of the corrosion inhibitor composition prepared in this comparative example, and the others are the same as in Example 7.

[0111] Comparative Example 8

[0112] Prepare a corrosion inhibitor composition: Replace the crude products of the compounds prepared in Examples 1 and 2 used in Example 4 with equal masses of the crude products of the compounds prepared in Comparative Examples 5 and 4 in sequence, and the others are the same as in Example 4;

[0113] Prepare a completion fluid: Replace the corrosion inhibitor composition prepared in Example 4 used in Example 7 with an equal mass of the corrosion inhibitor composition prepared in this comparative example, and the others are the same as in Example 7.

[0114] Performance evaluation of completion fluid

[0115] ⅰ Stability evaluation and density measurement

[0116] (1) Stability evaluation

[0117] Weigh 500 g of the completion fluids prepared in Examples 7 to 9, Comparative Examples 1 to 3, and Comparative Examples 6 to 8 into beakers respectively, observe their initial states and record; then place the beakers containing the completion fluids in an oven at 120 °C, take them out after standing for 24 h, observe their states and record.

[0118] The specific results are shown in Table 1.

[0119] Table 1. Stability evaluation of completion fluid

[0120] Serial number Initial state State after standing at 120 °C for 24 h Example 7 Homogeneous liquid Homogeneous liquid Example 8 Homogeneous liquid Homogeneous liquid Example 9 Homogeneous liquid Homogeneous liquid Comparative example 1 Heterogeneous liquid Heterogeneous liquid Comparative example 2 Heterogeneous liquid Heterogeneous liquid Comparative example 3 Heterogeneous liquid Heterogeneous liquid Comparative example 6 Homogeneous liquid Homogeneous liquid Comparative example 7 Homogeneous liquid Homogeneous liquid Comparative example 8 Homogeneous liquid Homogeneous liquid

[0121] Table 1 shows that before the start of the experiment, the completion fluids prepared in Examples 7 to 9 containing the corrosion inhibitor compositions prepared in Examples 4 to 6 and the completion fluids prepared in Comparative Examples 6 to 7 were in a homogeneous liquid state, while the completion fluids prepared in Comparative Examples 1 to 3 were in a non-homogeneous liquid state; after standing at 120 °C for 24 h, the three groups of completion fluids prepared in Examples 7 to 9 and the completion fluids prepared in Comparative Examples 6 to 8 remained homogeneous liquids without stratification, precipitation or precipitation phenomena, while the completion fluids prepared in Comparative Examples 1 to 3 all showed precipitation, stratification and turbidity phenomena and were non-homogeneous liquids, proving that among the corrosion inhibitor compositions prepared in Examples 4 to 6, the compounds prepared in Examples 1 to 3 had good solubility in the completion fluid, enabling the completion fluids prepared in Examples 7 to 9 to remain stable at high temperatures for a long time.

[0122] (2) Density measurement

[0123] At room temperature (25 °C), use a constant-temperature liquid densitometer to measure the density of the completion fluids prepared in Examples 7 to 9, Comparative Examples 1 to 3, and Comparative Examples 6 to 8. The specific data are shown in Table 2.

[0124] Table 2. Density of completion fluid

[0125]

[0126]

[0127] As can be seen from Table 2, the density of the completion fluids prepared in Examples 7 to 9 is 1.20 to 1.40, belonging to high-density completion fluids. The density of the completion fluid can be adjusted by adjusting the dosage of the organic acid salt therein to meet the actual use requirements.

[0128] ⅱ Corrosion inhibition evaluation

[0129] (1) Measurement of single-metal corrosion rate

[0130] The 168-hour corrosion rate of single metals was measured with reference to the "3. Determination Method of Atmospheric Static Corrosion Rate and Corrosion Inhibition Rate" in the standard SY / T5273-2000 "Performance Evaluation Method of Corrosion Inhibitors for Produced Water in Oilfields". During the experiment, the following adjustments were made to the experimental temperature, specimen material, and test medium in this standard:

[0131] Single metal material (i.e., specimen material): TP110SS, 718, and 825;

[0132] Experimental temperature: 60°C, 90°C, 120°C;

[0133] Test medium: 1000 mL of the completion fluid prepared in any one of Examples 7 to 9, Comparative Examples 1 to 3, and Comparative Examples 6 to 8 with carbon dioxide gas introduced. At the experimental temperatures of 60°C, 90°C, and 120°C, the partial pressure of carbon dioxide gas in the closed container was 1 MPa;

[0134] The specific results are shown in Table 3.

[0135] (2) Measurement of galvanic corrosion rate

[0136] The 168-hour corrosion rate of the galvanic couple was measured with reference to the method specified in the standard GB / T15748-2013 "Test Method for Galvanic Corrosion of Marine Metallic Materials". During the experiment, the following adjustments were made to the experimental temperature, galvanic couple material, and test medium in this standard:

[0137] Galvanic couple composition (area ratio 1:2): TP110SS + 718, TP110SS + 825, and TP110SS + G3;

[0138] Experimental temperature: 120°C;

[0139] Test medium: Carbon dioxide gas was introduced into 1000 mL of the completion fluid prepared in any one of Examples 7 to 9, Comparative Examples 1 to 3, and Comparative Examples 6 to 8 at a flow rate of 5 mL / min for 4 hours to obtain the completion fluid dissolved with carbon dioxide as the test medium. The specific results are shown in Table 4.

[0140] Table 3. Single metal corrosion rate

[0141]

[0142]

[0143] Table 4. Galvanic corrosion rate

[0144]

[0145] Tables 3 and 4 show that: using the completion fluids prepared in Examples 7 to 9 with carbon dioxide introduced as the corrosion medium, at 60 °C, 90 °C, and 120 °C: the corrosion rates of the single-metal electrodes made of TP110SS material are 0.03 to 0.034 mm / a (60 °C), 0.042 to 0.05 mm / a (90 °C), and 0.044 to 0.052 mm / a (120 °C) respectively; the corrosion rates of the single-metal electrodes made of 718 material are 0.026 to 0.03 mm / a (60 °C), 0.029 to 0.041 mm / a (90 °C), and 0.039 to 0.045 mm / a (120 °C) respectively; the corrosion rates of the single-metal electrodes made of 825 material are 0.010 to 0.022 mm / a (60 °C), 0.015 to 0.03 mm / a (90 °C), and 0.025 to 0.034 mm / a (120 °C) respectively; using the completion fluids prepared in Examples 7 to 9 with carbon dioxide introduced as the corrosion medium, at 120 °C: the corrosion rates of the galvanic couples composed of TP110SS + 718 with an area ratio of 2:1, TP110SS + 825 with an area ratio of 2:1, and TP110SS + G3 with an area ratio of 2:1 are 0.035 to 0.062 mm / a, 0.031 to 0.04 mm / a, and 0.007 to 0.011 mm / a respectively. The above data prove that the completion fluids prepared in Examples 7 to 9 have the performance of resisting CO 2 corrosion, and have good corrosion inhibition effects on both single-metal electrodes and galvanic couples.

[0146] Using the completion fluid prepared in Comparative Example 1 with carbon dioxide introduced as the corrosion medium: at 60 °C, 90 °C, and 120 °C, the corrosion rates of the single-metal electrodes made of TP110SS material are 2.7 times, 2 times, and 2.2 times that of Example 7 respectively; the corrosion rates of the single-metal electrodes made of 718 material are 2.3 times, 1.8 times, and 2.1 times that of Example 7 respectively; the corrosion rates of the single-metal electrodes made of 825 material are 2.4 times, 2.1 times, and 2.1 times that of Example 7 respectively; at 120 °C, the corrosion rates of the galvanic couples composed of TP110SS + 718 with an area ratio of 2:1, TP110SS + 825 with an area ratio of 2:1, and TP110SS + G3 with an area ratio of 2:1 are 1.9 times, 2.4 times, and 7.7 times that of Example 7 respectively. Under the same conditions, in the completion fluid prepared in Comparative Example 1, the corrosion rates of the single-metal electrodes and the galvanic couples are significantly higher than those in Example 7. Compared with the formulation of the completion fluid prepared in Example 7, the corrosion inhibitor composition in Comparative Example 1 is replaced with an equal mass of quaternary ammonium salt of quinoline benzyl chloride, indicating that the corrosion inhibition performance of the corrosion inhibitor composition provided by the present invention is superior to that of quaternary ammonium salt of quinoline benzyl chloride.

[0147] Using the completion fluid prepared in Comparative Example 2 with carbon dioxide introduced as the corrosion medium: at 60 °C, 90 °C, and 120 °C, the corrosion rates of the single-metal electrodes made of TP110SS material were 2.9 times, 2.2 times, and 2.3 times that of Example 8 respectively; the corrosion rates of the single-metal electrodes made of 718 material were 1.9 times, 1.5 times, and 1.5 times that of Example 7 respectively; the corrosion rates of the single-metal electrodes made of 825 material were 2.2 times, 1.9 times, and 1.9 times that of Example 8 respectively; at 120 °C, the corrosion rates of the galvanic couples composed of TP110SS + 718 with an area ratio of 2:1, TP110SS + 825 with an area ratio of 2:1, and TP110SS + G3 with an area ratio of 2:1 were 2.9 times, 3 times, and 10 times that of Example 8 respectively. Under the same conditions, in the completion fluid prepared in Comparative Example 2, the corrosion rates of the single-metal electrodes and the galvanic couples were significantly higher than those of Example 8. Compared with the formulation of the completion fluid prepared in Example 8, the corrosion inhibitor composition in Comparative Example 2 was replaced with an equal mass of vegetable oil acid tetraethylene pentamine imidazoline corrosion inhibitor, indicating that the corrosion inhibition performance of the corrosion inhibitor composition provided by the present invention is superior to that of the vegetable oil acid tetraethylene pentamine imidazoline corrosion inhibitor.

[0148] Using the completion fluid prepared in Comparative Example 3 with carbon dioxide introduced as the corrosion medium: at 60 °C, 90 °C, and 120 °C, the corrosion rates of the single-metal electrodes made of TP110SS material were 2.7 times, 2.4 times, and 2.6 times that of Example 9 respectively; the corrosion rates of the single-metal electrodes made of 718 material were 2.2 times, 2.8 times, and 2.4 times that of Example 9 respectively; the corrosion rates of the single-metal electrodes made of 825 material were 3 times, 4.3 times, and 1.9 times that of Example 9 respectively; at 120 °C, the corrosion rates of the galvanic couples composed of TP110SS + 718 with an area ratio of 2:1, TP110SS + 825 with an area ratio of 2:1, and TP110SS + G3 with an area ratio of 2:1 were 4.7 times, 6.5 times, and 12.3 times that of Example 9 respectively. Under the same conditions, in the completion fluid prepared in Comparative Example 3, the corrosion rates of the single-metal electrodes and the galvanic couples were significantly higher than those of Example 9. Compared with the formulation of the completion fluid prepared in Example 9, the corrosion inhibitor composition in Comparative Example 3 was replaced with an equal mass of tall oil acid tetraethylene pentamine imidazoline corrosion inhibitor, indicating that the corrosion inhibition performance of the corrosion inhibitor composition provided by the present invention is superior to that of the tall oil acid tetraethylene pentamine imidazoline corrosion inhibitor.

[0149] Using the completion fluid prepared in Comparative Example 6 with carbon dioxide injection as the corrosion medium: at 60 °C, 90 °C, and 120 °C, the corrosion rates of the single-metal electrodes made of TP110SS material were 2.1 times, 1.6 times, and 2 times that of Example 7, respectively; the corrosion rates of the single-metal electrodes made of 718 material were 1.9 times, 1.8 times, and 1.2 times that of Example 7, respectively; the corrosion rates of the single-metal electrodes made of 825 material were 2.4 times, 2.1 times, and 2.1 times that of Example 7, respectively; at 120 °C, the corrosion rates of the galvanic couples composed of TP110SS + 718 with an area ratio of 2:1, TP110SS + 825 with an area ratio of 2:1, and TP110SS + G3 with an area ratio of 2:1 were 1.2 times, 1.3 times, and 4.4 times that of Example 7, respectively.

[0150] Using the completion fluid prepared in Comparative Example 7 with carbon dioxide injection as the corrosion medium: at 60 °C, 90 °C, and 120 °C, the corrosion rates of the single-metal electrodes made of TP110SS material were 2 times, 1.5 times, and 1.7 times that of Example 7, respectively; the corrosion rates of the single-metal electrodes made of 718 material were 1.7 times, 1.5 times, and 1.6 times that of Example 7, respectively; the corrosion rates of the single-metal electrodes made of 825 material were 2 times, 1.8 times, and 1.8 times that of Example 7, respectively; at 120 °C, the corrosion rates of the galvanic couples composed of TP110SS + 718 with an area ratio of 2:1, TP110SS + 825 with an area ratio of 2:1, and TP110SS + G3 with an area ratio of 2:1 were 1.3 times, 1.8 times, and 5.1 times that of Example 7, respectively.

[0151] Using the completion fluid prepared in Comparative Example 8 with carbon dioxide injection as the corrosion medium: at 60 °C, 90 °C, and 120 °C, the corrosion rates of the single-metal electrodes made of TP110SS material were 2 times, 1.6 times, and 1.8 times that of Example 7, respectively; the corrosion rates of the single-metal electrodes made of 718 material were 1.9 times, 2 times, and 2.2 times that of Example 7, respectively; the corrosion rates of the single-metal electrodes made of 825 material were 1.4 times, 2 times, and 1.4 times that of Example 7, respectively; at 120 °C, the corrosion rates of the galvanic couples composed of TP110SS + 718 with an area ratio of 2:1, TP110SS + 825 with an area ratio of 2:1, and TP110SS + G3 with an area ratio of 2:1 were 1.1 times, 1.6 times, and 3.7 times that of Example 7, respectively.

[0152] Compared with Example 7, in Comparative Example 6, the compound prepared in Example 2 in the completion fluid was replaced with an equal mass of the compound prepared in Comparative Example 4; in Comparative Example 7, the compound prepared in Example 1 in the completion fluid was replaced with an equal mass of the compound prepared in Comparative Example 5; in Comparative Example 8, the compounds prepared in Examples 1 and 2 in the completion fluid were respectively replaced with equal masses of the compounds prepared in Comparative Examples 5 and 4. Under the same experimental conditions, the corrosion rates of the completion fluids prepared in Comparative Examples 6 to 8 for the single electrodes made of TP110SS, 718, and 825 materials, and the corrosion rates of the galvanic couples TP110SS + 718, TP110SS + 825, and TP110SS + G3 with an area ratio of 2:1 were all higher than those in Example 7. This shows that in the corrosion inhibitor composition provided by the present invention, the two compounds have a synergistic effect, and the completion fluid containing them has excellent corrosion inhibition performance for single electrodes or galvanic couples, and is applicable to high-temperature oil and gas wells not higher than 120°C for CO 2 anti-corrosion.

[0153] Although the present invention has been described with reference to specific embodiments, those skilled in the art should understand that various changes can be made without departing from the true spirit and scope of the present invention. In addition, various changes can be made to the main body, spirit, and scope of the present invention to adapt to specific situations, materials, material compositions, and methods. All such changes are included within the scope of the claims of the present invention.

Claims

1. A compound, the structural formula of which is shown in Formula I: Wherein, R is a C-C bond, methylene or ethylene; R' is benzyl or -CH 2 -COONa; M + is Na + or K + ; x is an integer from 0 to 20; y is an integer from 0 to 20; z is an integer from 0 to 20.

2. A method for preparing the compound according to claim 1, which comprises the following steps: 1) Subjecting a dibasic organic carboxylic acid and a polyamine to a first reaction to obtain a first reaction product; 2) Subjecting the first reaction product to a second reaction to obtain a second reaction product; 3) Subjecting the second reaction product and a quaternization reagent to a third reaction to obtain an imidazoline quaternary ammonium salt intermediate; 4) Subjecting the imidazoline quaternary ammonium salt intermediate and a hydroxide to a fourth reaction to obtain the compound.

3. According to the method of claim 2, characterized in that, the molar ratio of the dibasic organic carboxylic acid to the polyamine is 1:(1 to 1.5); and / or the molar ratio of the polyamine to the quaternization reagent is (1 to 1.05):(1.05 to 1.2); and / or the molar ratio of the polyamine to the hydroxide is 1:(1 to 1.5).

4. According to the method of claim 2 or 3, characterized in that, the dibasic organic carboxylic acid is selected from oxalic acid, malonic acid or succinic acid; and / or the polyamine is selected from at least one of diethylenetriamine, triethylenetetramine, tetraethylenepentamine and polyethylenepolyamine; and / or the quaternization reagent is benzyl chloride or sodium chloroacetate; and / or the hydroxide is potassium hydroxide or sodium hydroxide.

5. According to the method of any one of claims 2 to 4, characterized in that, in step 1), the first reaction is a gradient temperature rise reflux reaction; preferably, in step 1), the process of the gradient temperature rise reflux reaction is to reflux at 110 to 150 °C for 1 to 2 h, and then raise the temperature to 140 to 180 °C and reflux for 3 to 6 h; and / or in step 2), the conditions of the second reaction are to reflux at 220 to 280 °C for 3 to 6 h; and / or in step 3), the conditions of the third reaction are to react at 150 to 160 °C for 4 to 6 h; and / or in step 4), first cool down to 70 to 100 °C and add the hydroxide, and then carry out the fourth reaction; and / or the conditions of the fourth reaction are to react at 100 to 150 °C for 3 to 6 h.

6. A corrosion inhibitor composition, which comprises a first compound, a second compound, a non-ionic surfactant and a lower alcohol; the first compound is the compound according to claim 1 or the compound prepared by the method according to any one of claims 2 to 5, wherein R' is benzyl; The second compound is the compound as claimed in claim 1 or the compound prepared by the method as claimed in any one of claims 2 to 5, wherein R' is -CH 2 -COONa.

7. According to the corrosion inhibitor composition of claim 6, characterized in that, taking the mass of the corrosion inhibitor composition as 100%, the corrosion inhibitor composition comprises 69 wt% to 89.5 wt% of the first compound and the second compound in total, 0.5 wt% to 1 wt% of the non-ionic surfactant and 10 wt% to 30 wt% of the lower alcohol; and / or the mass ratio of the first compound to the second compound is 1:(1 to 1.5); preferably, the non-ionic surfactant is an alkylphenol polyoxyethylene ether; preferably, the alkylphenol polyoxyethylene ether is nonylphenol polyoxyethylene ether and / or octylphenol polyoxyethylene ether.

8. A completion fluid, which comprises a corrosion inhibitor composition, an organic acid salt, a bactericide, a stabilizer and water; The corrosion inhibitor composition is the corrosion inhibitor composition according to claim 6 or 7.

9. The completion fluid according to claim 8, characterized in that taking the mass of the completion fluid as 100%, the completion fluid comprises 1 wt% to 2 wt% of the corrosion inhibitor composition, 20 wt% to 60 wt% of the organic acid salt, 0.5 wt% to 1 wt% of the bactericide, 1 wt% to 2 wt% of the stabilizer and 37.5 wt% to 75.5 wt% of water; Preferably, the organic acid salt is formate; and / or the bactericide is bactericide 1227 and / or isothiazolinone; and / or the stabilizer is at least one of HEDP(4Na), ATMP(2Na) and EDTA(4Na).

10. Use of any one of the compound according to claim 1, the compound prepared by the method according to any one of claims 2 to 5, the corrosion inhibitor composition according to claim 6 or 7, and the completion fluid according to claim 8 or 9 in anti-corrosion of high-temperature oil and gas wells CO 2 anti-corrosion; Preferably, the high temperature is not higher than 120 °C.

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