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Corrosion inhibitor for acidification of oil well, and preparation and application thereof

A technology of oil well acidification and corrosion inhibitor, which is applied to chemical instruments and methods, boreholes/well components, production fluids, etc., and can solve the problems of high preparation cost of imidazolines, complex production process of compound pyridines, and high toxicity. Achieve the effect of good water solubility, high corrosion inhibition rate and less dosage

Active Publication Date: 2014-02-19
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the oil well acidizing corrosion inhibitors used at home and abroad mainly include organic amines, imidazolines, compound pyridines, etc. Among them, organic amines are more toxic, imidazolines are expensive to prepare, and the production process of compound pyridines is complicated. products have certain limitations

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] In the laboratory, a simple synthesis reaction device was assembled with a 500mL four-necked round bottom flask, a constant temperature electric heating mantle, an electric speed-adjustable stirrer, a condenser tube, and a thermometer. First add 40g of acetophenone and 20g of ethylenediamine in the flask of the synthesis reaction device, start stirring, turn on the condenser cooling water, add 171.4g of 35% formaldehyde solution while stirring, then add 37.4g of 32.5% hydrochloric acid, and finally Add 30 g of ethanol. Raise the temperature of the round-bottom flask slowly. When the temperature reaches 80°C, the liquid in the flask gradually changes from turbid to clear and transparent. When the temperature in the flask reaches 85°C, the reactants in the flask begin to boil, and there is liquid backflow in the condenser tube. The temperature in the flask There will be no obvious increase. When the temperature in the flask is maintained above 85°C for 3.5 hours, cut off ...

Embodiment 2

[0016] In a clean 1.5m 3 In the enamel reaction kettle, first add 108kg of acetophenone and 54kg of ethylenediamine, then add 40kg of ethanol, start stirring, after stirring for 3 to 5 minutes, add 462.9kg of 35% formaldehyde solution while stirring, and then add 32.5% 101kg of hydrochloric acid, and finally add 41kg of ethanol. Slowly raise the temperature of the kettle, stop heating when the temperature in the kettle reaches 80°C, due to the exothermic reaction, the temperature in the kettle continues to rise, start timing when the temperature in the kettle reaches 85°C, and the temperature in the kettle will continue to rise to 93°C, When the temperature in the kettle is maintained above 85°C for 3.5 hours, cut off the heating power supply, and when the temperature is naturally lowered to 55°C, add 62kg of propynyl alcohol into the kettle, then add 372kg of methanol, and after stirring evenly, the output will be commercial oil well acidification slow The etchant was 1208kg...

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PUM

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Abstract

The invention relates to a preparation method of a corrosion inhibitor for acidification of an oil well. The preparation method comprises the steps of adding formaldehyde, acetophenone, ethene diamine and HCl in a normal pressure reactor according to a molar ratio of 6 :1 :1 : 1 and adding ethanol as a solvent; heating to a temperature of 80-90 DEG C; reacting for 3-4 hours to obtain a condensation compound of aldehyde, ketone and amine; adding propynol with an amount of 5% that of a total mass of the product as a corrosion inhibitor synergistic ingredient and adding methanol with an amount of 30% that of a total mass of the product as a solvent to obtain the corrosion inhibitor for acidification of the oil well; and adding the corrosion inhibitor for acidification of the oil well with an amount of 0.4% that of the mass of the hydrochloric acid medium in a 15% hydrochloric acid medium at a temperature of 90 DEG C, so that corrosion rate of N80 test block can be reduced to 1.32 g / m<2>.h. The corrosion inhibitor for acidification of the oil well solves the corrosion problems of an acidizing fracturing liquid to downhole oil tubes, sleeves and used metal equipment during acidizing and fracturing of the oil well; usability of the corrosion inhibitor for acidification of the oil well is increased; and preparation cost for the corrosion inhibitor for acidification of the oil well is reduced.

Description

technical field [0001] The invention relates to an oil well acidizing corrosion inhibitor and its preparation and application. The corrosion inhibitor is mainly used to prevent acidizing fracturing fluid from corroding downhole oil pipes, casings and metal equipment used during oil well acidizing fracturing construction. corrosion field. Background technique [0002] Oil well acidizing and fracturing is one of the main measures to stabilize and increase production in various oilfields in my country. During oil field acid fracturing, the acid fracturing fluid (generally hydrochloric acid with a concentration of about 15% and various auxiliary materials) is driven into the formation through the oil well string, and the acid fracturing fluid reacts with the limestone and other components in the formation to form easy At the same time, under the action of high pressure, the pores of the formation are enlarged. When the soluble substances are discharged from the formation with t...

Claims

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Application Information

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IPC IPC(8): C09K8/54
CPCC09K8/74C09K2208/32E21B43/26
Inventor 孙梦慈王万真陶育恩陈智敏
Owner PETROCHINA CO LTD
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