Preparation method and application of micro-molecular anti-swelling shrinkage agent

An anti-swelling and shrinking agent, small molecule technology, applied in the direction of drilling compositions, chemical instruments and methods, etc., can solve the problems of poor compatibility of anion treatment agents, unsatisfactory inhibition effect, limited application, etc. Damage, eliminate water lock damage, reduce the effect of surface tension

Inactive Publication Date: 2014-06-18
XI'AN PETROLEUM UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to its large molecular weight, on the one hand, its excessive molecular weight limits its application in low-permeability oilfields; on the other hand, it can only be adsorbed on the surface of clay. Inhibition is not ideal
In addition, some polyamine shale clay expansion inhibitors still have many problems such as high toxicity and poor compatibility with anionic treatment agents.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] A kind of preparation of small molecule anti-expansion shrinkage agent, comprises the following steps:

[0017] In the first step, the amine is dissolved in 5 times of the solvent in the reaction kettle, and stirred evenly, the amine is industrial grade diethanolamine, and the solvent is industrial grade methanol;

[0018] In the second step, add a carboxylic acid with a ratio of 1:1 to the amino functional group in the amine to the above solution under stirring, and the carboxylic acid is lactic acid of industrial grade and above purity;

[0019] The third step is to heat the above mixture to 30°C until it is completely dissolved;

[0020] The fourth step is to evaporate the solvent in the above mixture and cool to room temperature;

[0021] The 5th step, above-mentioned mixture is transferred in the mortar, add the potassium chloride that is 5: 1 with the total mass ratio of amine and carboxylic acid, grind evenly, promptly obtain small molecule anti-expansion shrink...

Embodiment 2

[0024] A kind of preparation of small molecule anti-expansion shrinkage agent, comprises the following steps:

[0025] In the first step, the amine is dissolved in 8 times of the solvent in the reaction kettle and stirred evenly. The amine is technical grade triethanolamine, and the solvent is chemically pure ethanol;

[0026] In the second step, adding a carboxylic acid with a ratio of 1:1 to the amino functional group in the amine to the above solution under stirring, the carboxylic acid is technical grade tartaric acid;

[0027] In the third step, the above mixture is heated to 40°C until it is completely dissolved;

[0028] The fourth step is to evaporate the solvent in the above mixture and cool to room temperature;

[0029] The 5th step, above-mentioned mixture is transferred in the mortar, add the potassium chloride that is 3: 1 with the total mass ratio of amine and carboxylic acid, grind evenly, promptly obtain small molecule anti-expansion shrinkage agent, described...

Embodiment 3

[0032] A kind of preparation of small molecule anti-expansion shrinkage agent, comprises the following steps:

[0033] In the first step, the amine is dissolved in 15 times of the solvent in the reaction kettle and stirred evenly, the amine is analytically pure diethylenetriamine, and the solvent is analytically pure methanol;

[0034] In the second step, adding a carboxylic acid with a ratio of 1:3 to the amino functional group in the amine to the above solution under stirring, the carboxylic acid is chemically pure citric acid;

[0035] In the third step, the above mixture is heated to 55°C until it is completely dissolved;

[0036] The fourth step is to evaporate the solvent in the above mixture and cool to room temperature;

[0037] The 5th step, above-mentioned mixture is transferred in the mortar, add the potassium chloride that is 1: 1 with the total mass ratio of amine and carboxylic acid, grind evenly, promptly obtain small molecule anti-expansion shrinkage agent, de...

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PUM

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Abstract

The invention discloses a preparation method and application of a micro-molecular anti-swelling shrinkage agent. The preparation method of the micro-molecular anti-swelling shrinkage agent comprises the steps of dissolving amine into a solvent in a reaction kettle, uniformly stirring, adding carboxylic acid into the solution while stirring to obtain a mixture, heating the mixture until the mixture is completely dissolved, steaming the solvent in the mixture, and cooling to room temperature; transferring the mixture into a mortar, adding potassium chloride, and uniformly grinding the mixture and added potassium chloride to obtain the micro-molecular anti-swelling shrinkage agent. During application, the dosage of the micro-molecular anti-swelling shrinkage agent takes 0.1-2.0% of the mass of oil field working liquid; the anti-swelling rate of the micro-molecular anti-swelling shrinkage agent to clay is 50-80%; the swelling shrinkage ratio of the micro-molecular anti-swelling shrinkage agent is more than 20%. The micro-molecular anti-swelling shrinkage agent disclosed by the invention is small in molecular weight, good in inhibition performance and environment-friendly.

Description

technical field [0001] The invention relates to the technical field of preparation of anti-expansion and contraction agents, in particular to the preparation and application of a small molecule anti-expansion and contraction agent. Background technique [0002] The main component of mud shale is clay minerals, among which montmorillonite is a layered mineral composed of extremely fine-grained hydrous aluminosilicate, and the force between layers in its structure is weak van der Waals force. It is easy to absorb water and swell during the interaction process of water-based oilfield working fluid. Complex fault-block oilfields with low permeability and high pressure have high content of clay minerals, which are prone to swelling and migration when exposed to water, resulting in a decrease in permeability, an increase in water injection pressure, and a decrease in oil recovery. At present, in the actual production of oilfields, the method of adding clay stabilizers at the init...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/58C09K8/86
CPCC09K8/607C09K8/68C09K2208/12
Inventor 陈刚张洁蔡丹张黎
Owner XI'AN PETROLEUM UNIVERSITY
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