Corrosion inhibitor for steam flooding oil field produced water and preparation method thereof

A corrosion inhibitor and steam flooding technology, which is used in mining wastewater treatment, chemical instruments and methods, descaling and water softening, etc. It can save raw materials, meet the requirements of green and environmental protection, and the preparation method is simple.

Inactive Publication Date: 2019-05-28
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, most of the corrosion inhibitors used in oilfields are normal temperature corrosion inhibitors, the use temperature is lower than 60°C, and the high temperature corrosion inhibitors with a treatment temperature above 80°C are rarely used
Especially for steam flooding blocks, due to the particularity of the development process and geographical environment, the high temperature and high salinity of the produced fluid, the water quality is seriously corroded and scaled along the pipeline and wellbore string, and the general oilfield produced water corrosion inhibition Agent products are not resistant to high temperature, and the field application effect is not good
[0012] Corrosion inhibitors in the prior art need to be compounded many times, and more chemical pollutants must be produced during the compounding process. Therefore, it is necessary to find a corrosion inhibitor that can be prepared by a simple method and can meet the use of steam flooding produced water. Corrosion inhibitors have become a technical problem to be solved urgently

Method used

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  • Corrosion inhibitor for steam flooding oil field produced water and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034]The preparation method of corrosion inhibitor sample 1:

[0035] 1) Add oleic acid and diethylenetriamine with a molar ratio of 1:1 into a sealed stainless steel reaction kettle, add a carrier agent (xylene solution with a mass fraction of 20%), react at 80°C for 20h, and then undergo amidation dehydration reaction, and then raise the temperature to 200°C for 10 hours through cyclodehydration reaction, and the reaction is completed when the system does not produce water;

[0036] 2) Add 0.5 ml of quaternizing agent (benzyl chloride) dropwise into the reaction system, react at a temperature of 60° C., and react for 8 hours to obtain the corrosion inhibitor for steam flooding oilfield produced water of the present invention—sample 1.

Embodiment 2

[0038] The preparation method of corrosion inhibitor sample 2:

[0039] 1) Add oleic acid and diethylenetriamine with a molar ratio of 1:1.2 into a sealed stainless steel reaction kettle, add a carrier agent (xylene solution with a mass fraction of 20%), react at 170°C for 4 hours, and then undergo amidation dehydration reaction, and then raise the temperature to 210°C for 4 hours through cyclodehydration reaction, and the reaction is completed when the system does not produce water;

[0040] 2) Add 1.3ml of quaternizing agent (benzyl chloride) dropwise into the reaction system, react at a temperature of 90° C., and react for 4 hours to obtain the corrosion inhibitor for steam flooding oilfield produced water of the present invention—sample 2.

Embodiment 3

[0042] The preparation method of corrosion inhibitor sample 3:

[0043] 1) Add oleic acid and diethylenetriamine with a molar ratio of 2:3 into a sealed polytetrafluoroethylene reactor, add a carrier agent (petroleum ether solution with a mass fraction of 20%), react at 50°C for 10h, and then Amidation dehydration reaction, and then raise the temperature to 240°C for 3 hours through cyclodehydration reaction, and the reaction is completed when the system does not produce water;

[0044] 2) Add 2.3ml of quaternizing agent (dimethyl sulfate) dropwise into the reaction system, react at a temperature of 60° C., and react for 8 hours to obtain the corrosion inhibitor-sample 3 for steam flooding oilfield produced water according to the present invention.

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Abstract

The invention relates to a corrosion inhibitor for steam flooding oil field produced water and a preparation method thereof. The preparation method specifically comprises the steps that 1) oleic acidand diethylenetriamine are added into a sealed reaction kettle, a carrying agent is added, reaction is fully carried out, materials obtained after reaction are subjected to amidation dehydration, thenthe temperature is increased to 190-270 DEG C for cyclodehydration for 2-12 hours, and the reaction is completed after a system does not discharge water; and 2) a quaternization reagent is added intothe reaction materials, the reaction temperature is 40-120 DEG C, reaction is carried out for 2-10 hours, and the corrosion inhibitor is obtained after the reaction is finished. The corrosion inhibitor prepared through the preparation method can resist the high-temperature and high-mineralization environment of the steam flooding produced water, in addition, the preparation method is simple and is obviously different from the technical guidance that an imidazoline intermediate needs to be further compounded in the prior art, and therefore the economic cost and the time cost are saved, and meanwhile, the environmental protection policy requirements can be met.

Description

technical field [0001] The invention relates to the field of oil field technology, in particular to a corrosion inhibitor for steam flooding and a preparation method thereof. Background technique [0002] Crude oil in heavy oil reservoirs has high viscosity, and the viscosity of degassed crude oil is greater than 100 mPa·s at the reservoir temperature. In the oil extraction of oil fields, due to the special characteristics of high viscosity and high freezing point of heavy oil, the fluidity in the reservoir and the wellbore is poor, and the recovery rate of conventional extraction is low, that is, the normal economic output cannot be guaranteed. In order to ensure a reasonable recovery rate, it is often necessary to reduce the viscosity of crude oil by adopting thermal recovery technology to recover oil. The heavy oil thermal recovery technology mainly includes three technologies: steam huff and puff, steam flooding, and steam-assisted gravity drainage technology. [0003]...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F5/12B01J19/00C02F103/10
Inventor 杜灿敏周海刚徐英彪何留
Owner CHINA PETROLEUM & CHEM CORP
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