High-temperature acidizing corrosion inhibitor for oil-gas fields and preparation method thereof

An acidizing corrosion inhibitor, technology for oil and gas fields, applied in chemical instruments and methods, organic chemistry, earth-moving drilling, etc., can solve problems such as environmental pollution

Active Publication Date: 2014-06-18
SHANDONG TAIHE WATER TREATMENT TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The earliest high-temperature acidification corrosion inhibitor used was a...

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] a structured The synthetic method of Mannich base quaternary ammonium salt, preparation step is:

[0023] (1) In a reaction kettle equipped with a stirring and condensing device, add propynyl alcohol, formaldehyde and imidazoline, the molar ratio of propynyl alcohol: formaldehyde: imidazoline is 1:1.2:1, and simultaneously adjust the pH value to 1.5. Turn on the condensing device, turn on the stirring, heat to 100°C and reflux for 5 hours to obtain the Mannich base, and distill off excess formaldehyde and hydrogen chloride under reduced pressure.

[0024] (2) Add dodecane chloride dropwise at a rate of 800kg / h to the resulting Mannich base, heat to 100°C to maintain the temperature, and continue the reaction for 5 hours to obtain the Mannich base quaternary ammonium salt of the above structure.

Embodiment 2

[0026] a structured The synthetic method of Mannich base quaternary ammonium salt, preparation step is:

[0027] (1) In a reaction kettle equipped with a stirring and condensing device, add propynyl alcohol, formaldehyde and imidazoline, the molar ratio of propynyl alcohol: formaldehyde: imidazoline is 1:1.3:1, and simultaneously adjust the pH value to 1.5. Turn on the condensing device, turn on the stirring, heat to 100°C and reflux for 5 hours to obtain the Mannich base, and distill off excess formaldehyde and hydrogen chloride under reduced pressure.

[0028] (2) Add benzyl chloride dropwise at a rate of 500kg / h to the resulting Mannich base, heat to 100°C to maintain the temperature, and continue the reaction for 4 hours to obtain the Mannich base quaternary ammonium salt of the above structure.

Embodiment 3

[0030] a structured The synthetic method of Mannich base quaternary ammonium salt, preparation step is:

[0031] (1) In a reaction kettle equipped with a stirring and condensing device, add propynyl alcohol, formaldehyde and imidazoline, the molar ratio of propynyl alcohol: formaldehyde: imidazoline is 1:1.3:1, and simultaneously adjust the pH value to 2.0. Turn on the condensing device, turn on the stirring, heat to 90°C and reflux for 7 hours to obtain the Mannich base, and distill off excess formaldehyde and hydrogen chloride under reduced pressure.

[0032] (2) Add benzyl chloride dropwise at a rate of 500kg / h to the resulting Mannich base, heat to 100°C to maintain the temperature, and continue the reaction for 4 hours to obtain the Mannich base quaternary ammonium salt of the above structure.

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PUM

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Abstract

The invention relates to a method for preparing a high-temperature acidizing corrosion inhibitor for oil-gas fields. The method comprises the following steps: firstly a certain amount of alkynol, a formaldehyde solution and imidazoline are added into a reaction kettle with a mixer and a condensing device, and simultaneously the pH value is adjusted using hydrochloric acid; the condensing device is turned on, heating and mixing are started, a mannich base is obtained based on reflux reaction, and excessive formaldehyde and hydrogen chloride are removed by vacuum distillation; then a quaternization reagent is dripped into the mannich base, and the mixture is heated and maintained the temperature for continuous reaction to obtain mannich quaternary ammonium salt, wherein the mole ratio of alkynol, formaldyhyde and imidazoline is 1:1.0-1.5:1, the pH value of the reaction system is smaller than or equal to 2, the reaction temperature is 80-120 DEG C, and the reaction time is 3-10 hours; the quaternization reagent is chlorohydrocarbon, the dripping speed is 300-1000 kg/h per ton of production capacity, the reaction temperature of quatermization is 90-120 DEG C, and the reaction time is 3-7 hours.

Description

technical field [0001] The invention relates to a water treatment agent and a preparation method thereof, in particular to an oil and gas field high-temperature acidification corrosion inhibitor and a preparation method thereof. Background technique [0002] Acidizing is one of the effective measures to increase injection in oil and gas fields, but the acid liquid has serious corrosion on oil well metal equipment and oil and gas pipelines. In addition, with the deepening of oil and gas field exploitation, more and more high-temperature wells begin to appear, which has a great impact on acidizing corrosion inhibition. Requirements for agents are getting higher and higher. In recent years, a lot of research work has been done in the field of oil well corrosion inhibitor research at home and abroad, great progress has been made, and a series of new varieties of acidification corrosion inhibitors have been developed. However, there are few studies on high-temperature acidificat...

Claims

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Application Information

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IPC IPC(8): C09K8/54C23F11/14C07D233/22C02F5/10
CPCC02F5/12C07D233/06C07D233/14C09K8/74C09K2208/32C23F11/149
Inventor 张秀华闫鹏刘全华万振涛李鹏飞
Owner SHANDONG TAIHE WATER TREATMENT TECH CO LTD
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