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High-cationic-degree clay stabilizer and preparation method thereof

A clay stabilizer and cationic degree technology, applied in chemical instruments and methods, drilling compositions and other directions, can solve the problems of unsatisfactory anti-swelling effect, insufficient long-term effect, narrow application range, etc., and achieve inhibition of hydration swelling. Good migration, anti-swelling effect, good anti-swelling effect

Active Publication Date: 2019-11-15
NORTHEAST GASOLINEEUM UNIV
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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 provides a clay stabilizer with high cationicity, which solves the problems of large dosage, narrow application range, unsatisfactory anti-swelling effect and insufficient long-term performance of existing clay stabilizers.

Method used

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  • High-cationic-degree clay stabilizer and preparation method thereof
  • High-cationic-degree clay stabilizer and preparation method thereof
  • High-cationic-degree clay stabilizer and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] 1. Raw material composition

[0033] In terms of mass components, it includes: 25 parts of dimethylamine, 51.4 parts of epichlorohydrin, 3.3 parts of polyethyleneimine, and 186 parts of water.

[0034] 2. Preparation steps

[0035] (1) Add dimethylamine to a three-necked flask with a stirring and reflux condenser, start a magnetic stirrer, cool in an ice-water bath, cool down the dimethylamine to below 10°C, and keep the temperature for 5 minutes.

[0036] (2) In the case of stirring, use a constant pressure funnel to drop epichlorohydrin into the dimethylamine liquid cooled in the three-necked flask in step (1), open the reflux condenser for reflux cooling, and control the dropping speed, The whole dropping time is about 1.5h, and the reaction temperature is controlled within the range of 10°C to 20°C.

[0037] (3) Mix polyethyleneimine with water to prepare polyethyleneimine aqueous solution.

[0038] (4) After the addition of epichlorohydrin is completed, add the ...

Embodiment 2

[0040] 1. Raw material composition

[0041] In terms of mass components, it includes: 25 parts of dimethylamine, 102.8 parts of epichlorohydrin, 7 parts of polyethyleneimine, and 314.5 parts of water.

[0042] 2. Preparation steps

[0043] The first three steps are the same as those in Example 1. The difference in step (4) is that the temperature is raised to 60°C, and the temperature is maintained for 6 hours to obtain the high cationic clay stabilizer of Example 2.

Embodiment 3

[0045] 1. Raw material composition

[0046] In terms of mass components, it includes: 25 parts of dimethylamine, 77.1 parts of epichlorohydrin, 5.9 parts of polyethyleneimine, and 252 parts of water.

[0047] 2. Preparation steps

[0048] The first three steps are the same as those in Example 1. The difference in step (4) is that the temperature is raised to 70°C, and the temperature is maintained for 4 hours to obtain the high cationicity clay stabilizer of Example 3.

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Abstract

The invention discloses a high-cationic-degree clay stabilizer and a preparation method thereof. The high-cationic-degree clay stabilizer comprises the following synthesis raw materials: dimethylamine, epoxy chloropropane, polyethyleneimine and water. The preparation method comprises the following steps: cooling the dimethylamine, adding dropwise the epoxy chloropropane into the dimethylamine to be subjected to a first synthesis reaction; and after the first synthesis reaction is completed, adding a polyethyleneimine aqueous solution into the product of the first synthesis reaction to be subjected to a second synthesis reaction, so as to obtain the high-cationic-degree clay stabilizer. The problems that a conventional clay stabilizer is large in dosage, narrow in application range, not ideal in anti-puffing effect and insufficient in long-lasting effect can be solved.

Description

technical field [0001] The invention relates to the field of petrochemical industry, and relates to a clay stabilizer which is added in the water injection process of an oil field to prevent clay hydration and migration in formations and a preparation method thereof. Background technique [0002] During oilfield operations, as long as the drilling fluid or production fluid that can hydrate and expand clay is injected into the oil layer (such as spacer fluid, perforation fluid, well flushing fluid, acidizing fluid, fracturing fluid, injection water, etc.), clay water will be caused. Chemical expansion reduces permeability, increases oil flow resistance, and damages formation. [0003] The cations produced by the electrolysis of the clay stabilizer in the water-based material can be adsorbed on the surface of the clay particles through electrostatic action, reducing the negative charge of the clay particles, and can also be wrapped on the surface of the clay particles to inhib...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G73/02C09K8/035
CPCC08G73/0226C09K8/035C09K2208/12
Inventor 范振忠尹剑宇刘庆旺孙傲乔三原
Owner NORTHEAST GASOLINEEUM UNIV