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Preparation method and application of Mannich base corrosion inhibitor suitable for high temperature acidification

A Mannich base and corrosion inhibitor technology, which is applied in the field of Mannich base corrosion inhibitor preparation, can solve problems such as easy coking, corrosion inhibitor damage, corrosion inhibition effect decline, etc., to reduce production costs and improve surface activity , good dispersion effect

Active Publication Date: 2014-12-17
BC P INC CHINA NAT PETROLEUM CORP +2
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  • Abstract
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Problems solved by technology

[0003] In recent years, acidification has gradually developed into high-temperature deep wells. In the acidification fluid, high temperature has seriously damaged the corrosion inhibitor in the acidification fluid, and the corrosion inhibition effect has dropped drastically. The original corrosion inhibitor cannot meet the needs of high-temperature acidification.
At present, the commonly used anti-high temperature acidification corrosion inhibitors in China have the disadvantages of easy coking, delamination, and insufficient stability of dissolution and dispersion at high temperatures, which can not only protect oil well pipes and downhole metal equipment, but also cause formation damage.

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  • Preparation method and application of Mannich base corrosion inhibitor suitable for high temperature acidification

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preparation example Construction

[0027] See attached figure 1 A method for preparing a Mannich base corrosion inhibitor suitable for high-temperature acidification provided by the invention comprises the following steps:

[0028] Step 1: Prepare aldehyde, ketone, and amine condensation products by Mannich base reaction; the composition of the reactant is as follows: calculated by the molar ratio of substances, 1 molar ratio of rosin amine, 2 to 4 molar ratios of paraformaldehyde, 2 to 3 Acetophenone and 2,4-pentanedione in molar ratio;

[0029] Step 2: Purifying the aldehyde, ketone, and amine condensate by vacuum distillation;

[0030] Step 3: Add the purified aldehyde, ketone, and amine condensates into a reaction vessel, and then add the following reactants to the reaction vessel under normal pressure: triethanolamine, 3-methyl-1-pentyn-3-ol, Pingpingjia O-25, Alkylphenol Polyoxyethylene Ether OP-10, Potassium Iodide, Methanol, Dimethylformamide and Bismuth Trichloride;

[0031] Wherein, the mass fracti...

Embodiment 1

[0038] Calculated according to the molar ratio of substances, add 2 molar ratios of paraformaldehyde, 2 molar ratios of acetophenone and 2,4-pentanedione into the enamel reaction kettle, slowly raise the temperature to 100°C, add hydrochloric acid as a catalyst for the reaction, hydrochloric acid Adjust the pH value of the reactant mixture to 3; then, add 1 mole ratio of rosin amine and methanol into the enamel reaction kettle, and react for 16 hours to form aldehyde, ketone and amine condensation products. Then, the aldehyde, ketone, and amine condensates generated are added to a distillation tower for purification by distillation under reduced pressure.

[0039] Add the purified aldehyde, ketone, and amine condensate into the enamel reaction kettle, control the pressure in the enamel reaction kettle to normal pressure, and then add the following reactants into the enamel reaction kettle: triethanolamine, 3-methyl-1-pentyne -3-alcohol, Pingpinga O-25, alkylphenol polyoxyethyl...

Embodiment 2

[0042] Calculated according to the molar ratio of substances, add 4 molar ratios of paraformaldehyde, 3 molar ratios of acetophenone and 2,4-pentanedione into the enamel reaction kettle, slowly raise the temperature to 110°C, add hydrochloric acid as a catalyst for the reaction, hydrochloric acid Adjust the pH value of the reactant mixture to 3; then, add 1 mole ratio of rosin amine and methanol into the enamel reaction kettle, and react for 16 hours to form aldehyde, ketone and amine condensation products. Then, the aldehyde, ketone, and amine condensates generated are added to a distillation tower for purification by distillation under reduced pressure.

[0043] Add the purified aldehyde, ketone, and amine condensate into the enamel reaction kettle, control the pressure in the enamel reaction kettle to normal pressure, and then add the following reactants into the enamel reaction kettle: triethanolamine, 3-methyl-1-pentyne -3-alcohol, Pingpinga O-25, alkylphenol polyoxyethyl...

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Abstract

The invention relates to a preparation method and an application of a Mannich base corrosion inhibitor suitable for high temperature acidification. The preparation method comprises the following steps: preparing an aldehyde-ketone-amine condensate through a Mannich base reaction, and carrying out reduced pressure distillation on the aldehyde-ketone-amine condensate to purify the aldehyde-ketone-amine condensate; and adding the purified aldehyde-ketone-amine condensate into a reaction container, and adding triethanolamine, 3-methyl-1-pentyn-3-ol, peregal O-25, alkylphenol polyoxyethylene OP-10, potassium iodide, methanol, dimethyl formamide and bismuth trichloride into the reaction container under normal pressure. The corrosion inhibitor produced through the preparation method has the advantages of good dispersion in hydrochloric acid, mud acid and ethanol solutions, good surface activity, less coking and low freezing point, and is suitable for yield increase work construction of 120-140DEG C deep wells, 15-28% concentrated hydrochloric acid or mud acid acidification oil and gas wells.

Description

technical field [0001] The invention relates to the technical field of chemicals used in oil and gas well stimulation operations, in particular to a preparation method and application of a Mannich base corrosion inhibitor suitable for high-temperature acidification. Background technique [0002] With the deepening of oilfield development, more wells are drilled in new development blocks. In the process of oil well exploitation, acidification is needed to improve recovery. The injection of acid causes corrosion of oil well tubing and downhole metal equipment, resulting in great economic losses. Therefore, in the acidizing of oil wells, especially in high-temperature deep wells and ultra-deep wells with concentrated hydrochloric acid and large acid volume, the important task is to solve the problem of corrosion protection of high-temperature acidizing fluids on oil well pipes and downhole metal equipment. [0003] In recent years, acidification has gradually developed into hig...

Claims

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Application Information

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IPC IPC(8): C09K8/54C09K8/74
CPCC09K8/604C09K8/725C09K8/74C09K2208/32
Inventor 韩文礼李玲杰解蓓蓓杨耀辉徐忠苹张贻刚张彦军
Owner BC P INC CHINA NAT PETROLEUM CORP
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