Corrosion inhibition scale-removing agent used for CO2 flooding as well as preparation method and use method of corrosion inhibition scale-removing agent

A corrosion inhibition and scale removal technology, which is applied in chemical instruments and methods, earthwork drilling, wellbore/well components, etc., can solve problems such as pipe string corrosion, efficiency limitation, and oil field production efficiency that affect the service life of the pipe string. To achieve the effect of prolonging service life

Active Publication Date: 2019-04-12
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] At present, the application of corrosion inhibitors and scale inhibitors in oilfields can slow down the formation of downhole oilfield scale, but corrosion inhibitors and scale inhibitors only have anti-corrosion and anti-scale effects.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0028] Example 1:

[0029] This embodiment provides a CO 2 Corrosion and scale cleaning agent for flooding, composed of the following weight percentages: benzoic acid thioureido imidazoline 18%, benzoic acid phosphate thioureido imidazoline 2%, isopropanol 11%, acetic acid 8%, Sodium polyepoxysuccinate 13%, OP-10 6%, quinoline quaternary ammonium salt 14%, sodium polystyrene sulfonate 7%, disodium ethylenediaminetetraacetic acid 8%, sodium diethylenetriaminepentaacetate 12%, N-dodecylmethylene di-secondary ammonium salt 2%, the balance is water.

[0030] Wherein, the benzoic acid phosphate thioureido imidazoline is prepared by reacting equimolar amounts of benzoic acid thioureido imidazoline and dimethyl phosphite in ethanol.

[0031] The preparation method of benzoic acid thioureido imidazoline includes the following steps:

[0032] Step 1) Take n (benzoic acid): n (tetraethylene pentamine) = 1:1.2 as raw materials, use xylene as water-carrying agent, react at 170°C for 3 hours and ...

Example Embodiment

[0039] Example 2:

[0040] This embodiment provides a CO 2 Corrosion and scale cleaning agent for flooding, consisting of the following weight percentages: benzoic acid thioureido imidazoline 17%, benzoic acid phosphate thioureido imidazoline 1%, isopropanol 9%, acetic acid 7%, Sodium polyepoxysuccinate 11%, OP-10 3%, quinoline quaternary ammonium salt 12%, sodium polystyrene sulfonate 3%, disodium ethylenediaminetetraacetic acid 5%, sodium diethylenetriaminepentaacetate 11%, N-dodecylmethylene bis-secondary ammonium salt 2%, the balance is water.

[0041] Among them, the preparation methods of benzoic acid thioureido imidazoline, benzoic acid phosphate thioureido imidazoline, and quinoline quaternary ammonium salt are the same as in Example 1. See Example 1 for the preparation method of the corrosion inhibitor and scale cleaner.

[0042] Through the synergistic effect of the above components, not only the CO 2 Corrosion has a good corrosion inhibition effect; and it has a good sca...

Example Embodiment

[0043] Example 3:

[0044] This embodiment provides a CO 2 Corrosion and scale cleaning agent for flooding, composed of the following weight percentages: benzoic acid thioureido imidazoline 21%, benzoic acid phosphate thioureido imidazoline 3%, isopropanol 13%, acetic acid 11%, Sodium polyepoxysuccinate 15%, OP-10 7%, quinoline quaternary ammonium salt 16%, polystyrene sulfonate 7%, disodium ethylenediaminetetraacetic acid 9%, sodium diethylenetriaminepentaacetate 15%, N-dodecylmethylene di-secondary ammonium salt 6%, the balance is water.

[0045] Among them, the preparation methods of benzoic acid thioureido imidazoline, benzoic acid phosphate thioureido imidazoline, and quinoline quaternary ammonium salt are the same as in Example 1. See Example 1 for the preparation method of the corrosion inhibitor and scale cleaner.

[0046] The corrosion and scale cleaning agent is aimed at CO in low permeability reservoirs with high salinity and high scaling tendency. 2 It was developed to ...

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PUM

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Abstract

The invention provides a corrosion inhibition scale-removing agent used for CO2 flooding as well as a preparation method and use method of the corrosion inhibition scale-removing agent. The corrosioninhibition scale-removing agent is composed of the following substances, in percentages by weight: 17-21% of benzoic acid thioureido imidazoline, 1-3% of benzoic acid phosphate thioureido imidazoline,9-13% of isopropanol, 7-11% of acetic acid, 11-15% of sodium polyepoxysuccinate, 3-7% of OP-10, 12-16% of quinoline quaternary ammonium, 3-7% of poly(sodium-styrennesulfonate), 5-9% of ethylenediaminetetraacetic acid disodium salt, 11-15% of diethylenetriaminepentaacetic acid pentasodium salt, 2-6% of N-dodecyl methylene bis-sec-ammonium salt, and the balance of water. The corrosion inhibition scale-removing agent provided by the invention overcomes the problem that a current corrosion inhibitor usually has a single corrosion inhibiting effect and a current scale inhibitor usually has a single scale inhibiting effect, can effectively play a corrosion inhibition effect while efficiently preventing scaling of oilfield water, and especially has a better scale-removing effect on barium strontium scale formed by formation water with high barium and strontium ions.

Description

technical field [0001] The invention belongs to the technical field of oilfield water treatment, in particular to a CO 2 Corrosion inhibitor and scale remover for oil displacement, preparation method and application method. Background technique [0002] At present, more than 70% of my country's newly discovered and discovered undeveloped crude oil reserves are low-permeability oil fields and hard-to-recover reserves. Such oil fields are difficult to develop economically and effectively, and the oil recovery rate is low. Field practice at home and abroad proves that CO 2 Oil flooding can greatly increase the recovery rate of low-permeability oilfields and the production rate of hard-to-recover reserves. Miscible oil flooding can increase oil recovery by more than 10%, and immiscible oil flooding can increase oil recovery by more than 7%. [0003] CO 2 Water injection is used for development before flooding, since the formation water is CaCl 2 Water type, high average sal...

Claims

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Application Information

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IPC IPC(8): C09K8/528C09K8/54C07D233/02C07D215/10
CPCC09K8/528C09K8/54C07D215/10C07D233/02C23F11/10
Inventor 唐泽玮周佩何淼董俊于淑珍刘爱华周志平戚建晶黄伟李明星
Owner PETROCHINA CO LTD
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