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A kind of oil well corrosion inhibitor and salt inhibitor and preparation method thereof

A technology for corrosion inhibition and oil wells, applied in chemical instruments and methods, earthwork drilling, wellbore/well components, etc., can solve the problems of poor temperature resistance of corrosion inhibitors, difficulty in inhibiting sulfide corrosion and pitting corrosion, etc., to achieve strong adsorption effect

Active Publication Date: 2018-06-26
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a corrosion and salt inhibitor for oil wells in order to overcome defects such as poor temperature resistance of existing corrosion inhibitors, difficulty in inhibiting sulfide corrosion and pitting, and salt plugging in well bores.

Method used

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  • A kind of oil well corrosion inhibitor and salt inhibitor and preparation method thereof
  • A kind of oil well corrosion inhibitor and salt inhibitor and preparation method thereof
  • A kind of oil well corrosion inhibitor and salt inhibitor and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0021] Add 20 grams of 1-chloromethylnaphthalene and 8 grams of quinoline into the reaction kettle, heat to 140 ° C and stir for 4 hours; after the reaction is completed, reduce the temperature to 80 ° C, and then add 100 grams of ferrocyanide with a mass concentration of 20%. Potassium solution, 15 grams of sodium organophosphate solution with a mass concentration of 20%, stir evenly and adjust the pH to 6 at 30°C to obtain an oil well corrosion and salt inhibitor.

Embodiment 2

[0023] Add 22 grams of 1-bromomethylnaphthalene and 9 grams of quinoline into the reaction kettle, heat to 145 ° C and stir for 5 hours; after the reaction is completed, reduce the temperature to 90 ° C, and then add 120 grams of ferrocyanide with a mass concentration of 20% Sodium solution, 15 grams of sodium carboxymethyl cellulose solution with a mass concentration of 20%, stir evenly, and adjust the pH to 8 at 50°C to obtain an oil well corrosion and salt inhibitor.

[0024] Embodiment 3~10 steps are identical with embodiment 1 or 2, and each composition and test condition are as shown in table 1:

[0025] Table 1 Embodiment 3~10 formula composition and synthesis condition (unit: g)

[0026]

[0027] Note: 20% in the above table refers to the solution with a mass concentration of 20%.

[0028] The corrosion inhibitor and salt inhibitor that embodiment 1~10 obtains is in saturated hydrogen sulfide / carbon dioxide, salinity 20 * 10 4 mg / L, dosage of 300ppm, temperature o...

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Abstract

The invention discloses an oil-well corrosion-inhibition salt inhibitor and a preparation method thereof. The oil-well corrosion-inhibition salt inhibitor is obtained by mixing a substance A, a salt inhibition main agent and a salt inhibition auxiliary agent in a mass ratio of (5-30):(5-20):(1-10), and adjusting pH to 6-8, wherein the substance A is prepared by reaction of 1-halogenmethyl naphthaline and quinoline at 130 DEG C-150 DEG C. Corrosion-inhibition rate of the corrosion-inhibition salt inhibitor can reach over 85% under acid conditions such as a high temperature (120 DEG C) and a high degree of mineralization (20*10<4> mg / L), so that a pipe has no point corrosion on surface and has salt inhibition rate of over 90%. After being used, the agent can be decomposed into an organic phase and an organic phase, wherein the inorganic phase can be treated with sewage in output liquid, and the organic phase is in a state of suspension and can be directly separated.

Description

technical field [0001] The invention relates to an oil well corrosion and salt inhibitor and a preparation method thereof, belonging to the technical field of oil field chemical agents and preparation. Background technique [0002] In the middle and late stages of oilfield exploitation, due to factors such as increased water content of the produced fluid and high salinity of the produced water, the corrosion of the tubing is increasingly severe and the tubing is seriously salted, which directly affects the normal production. It is commonly used to add corrosion inhibitors and salt inhibitors. One of the ways to solve the problem, but commonly used chemicals generally have problems such as residual pollution, short time limit, poor temperature and salt resistance, and whether they are compatible. At present, there are many researches on corrosion inhibitors at home and abroad, with good effects and representative The patents include: ZL200710186846.9 discloses an oilfield cor...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/54
CPCC09K8/54C09K2208/32
Inventor 陈洪杰黄雪松关建庆吴信荣林伟民杜彦敏马喜玲常丽芳
Owner CHINA PETROLEUM & CHEM CORP