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Oil field neutral corrosion and scale inhibitor and preparation method thereof

A corrosion and scale inhibitor, neutral technology, applied in the field of neutral corrosion and scale inhibitor in oilfield and its preparation, can solve the problems of poor scale inhibition effect and low corrosion inhibition rate, and achieve good corrosion inhibition and corrosion inhibition rate. High, good anti-scaling effect

Active Publication Date: 2020-09-25
XINJIANG DELAND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In view of this, the present invention proposes a neutral corrosion and scale inhibitor for oilfields and its preparation method, aiming to solve the problems of low corrosion inhibition rate and poor scale inhibition effect caused by the separate use of existing corrosion inhibitors and scale inhibitors

Method used

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preparation example Construction

[0029] Further, a preparation method of an oilfield neutral corrosion and scale inhibitor, comprising the following steps:

[0030] (1) Chloroacetic acid and sodium hydroxide solution are added to the reaction kettle, and ethylenediamine is added under stirring to obtain mixed solution A;

[0031] (2) Heat the mixture A to 25±3°C, and keep stirring at 25±3°C for 1.5h, continue heating to 45±3°C, then add phosphorous acid, and keep stirring at 45±3°C 1h prepared mixed liquid B.

[0032] (3) Cool the mixed solution B to 25°C, then add aminotriethylene phosphoric acid and bis-carboxyethyl hypophosphorous acid, and finally adjust the pH to 6.5-7.5 with sodium hydroxide solution to prepare a neutral corrosion and scale inhibitor for oilfields .

[0033] The mass fraction of the sodium hydroxide solution is 30%.

Embodiment 1

[0035] A neutral corrosion and scale inhibitor for oil fields, comprising the following raw materials in parts by weight: 10 parts of chloroacetic acid, 5 parts of sodium hydroxide solution, 15 parts of ethylenediamine, 10 parts of phosphorous acid, 15 parts of aminotriethylene phosphoric acid, dimer 20 parts of carboxyethyl hypophosphorous acid.

[0036] The mass fraction of sodium hydroxide in the above sodium hydroxide solution is 30%.

[0037] Its specific preparation process operates according to the following steps:

[0038] (1) Chloroacetic acid and sodium hydroxide solution are added to the reaction kettle, and ethylenediamine is added under stirring to obtain mixed solution A;

[0039] (2) Heat the mixture A to 25±3°C, and keep stirring at 25±3°C for 1.5h, continue heating to 45±3°C, then add phosphorous acid, and keep stirring at 45±3°C 1h prepared mixed liquid B.

[0040] (3) Cool the mixed solution B to 25°C, then add aminotriethylene phosphoric acid and bis-car...

Embodiment 2

[0042] A neutral corrosion and scale inhibitor for oil fields, comprising the following raw materials in parts by weight: 15 parts of chloroacetic acid, 8 parts of sodium hydroxide solution, 20 parts of ethylenediamine, 15 parts of phosphorous acid, 25 parts of aminotriethylene phosphoric acid, dimer Carboxyethyl hypophosphorous acid 25 parts.

[0043] The mass fraction of sodium hydroxide in the above sodium hydroxide solution is 30%.

[0044] Its specific preparation process operates according to the following steps:

[0045] (1) Chloroacetic acid and sodium hydroxide solution are added to the reaction kettle, and ethylenediamine is added under stirring to obtain mixed solution A;

[0046] (2) Heat the mixture A to 25±3°C, and keep stirring at 25±3°C for 1.5h, continue heating to 45±3°C, then add phosphorous acid, and keep stirring at 45±3°C 1h prepared mixed liquid B.

[0047] (3) Cool the mixed solution B to 25°C, then add aminotriethylene phosphoric acid and bis-carbox...

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PUM

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Abstract

The invention provides an oil field neutral corrosion and scale inhibitor and a preparation method thereof. The oil field neutral corrosion and scale inhibitor is prepared from the following raw materials in parts by weight: 10 to 25 parts of chloroacetic acid, 5 to 15 parts of a sodium hydroxide solution, 15 to 30 parts of ethylene diamine, 10 to 20 parts of phosphorous acid, 15 to 25 parts of amino trimethylene phosphoric acid and 20 to 30 parts of dicarboxyethyl hypophosphorous acid. The neutral corrosion and scale inhibitor has corrosion inhibition and scale inhibition properties at the same time, avoids the situation that an existing corrosion inhibitor and an existing scale inhibitor are used separately and can inhibit each other, and further well solves the problems of low corrosioninhibition rate and poor scale inhibition effect of an existing corrosion inhibitor and an existing scale inhibitor.

Description

technical field [0001] The invention relates to the technical field of oilfield chemical additives, in particular to an oilfield neutral corrosion and scale inhibitor and a preparation method thereof. Background technique [0002] At present, the mining process of most oilfields in my country has entered the tertiary recovery stage. As we all know, whether it is primary oil recovery, secondary oil recovery or tertiary oil recovery, pipeline scaling has always been a serious problem that plagues mining, because pipeline scaling will not only seriously block pipelines, Affecting pipeline gathering and transportation, some oil wells even caused a decrease in oilfield production fluid due to scaling; at the same time, corrosion is also a serious problem in the oilfield production process. With the continuous development of oilfields, the water content of crude oil has increased year by year, resulting in The corrosion of wellbore and surface oil gathering pipelines, equipment and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F5/14C02F1/66C02F103/10
CPCC02F5/145C02F1/66C02F2303/08C02F2103/10
Inventor 宋勇艾山·玉素莆余莉陈晓青
Owner XINJIANG DELAND
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