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Aluminium citrate oil production additive and preparing process thereof

A technology of aluminum citrate and additives, applied in drilling equipment, etc., can solve the problems of harsh raw materials, unsatisfactory, slow dissolution of solid components, etc., and achieve the effects of stable performance, low production cost, and easy transportation

Inactive Publication Date: 2003-05-28
EAST CHINA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method has several disadvantages: First, the solid components are very slow to dissolve
However, neither the aluminum content in the dry powder nor the aluminum content in the solution can meet the requirements of the petroleum industry, and the raw materials are too harsh. How to increase the aluminum content in the dry powder and the aluminum content in the solution is the key to solving the problem

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] Put aluminum chloride in a 500ml reactor to form an aqueous solution with an aluminum ion content of about 0.5mol / L. There is undissolved aluminum chloride in the solution. Slowly add the solution containing For an aqueous solution of about 0.25mol / L citric acid, the undissolved aluminum salt in the solution gradually dissolves. After the dropwise addition, continue to stir for about 0.5 hours until the solution is clear; start adding ammonia water dropwise, and when the pH value is 1.4, there A white precipitate was formed until the pH value of the solution was 4.0 and the white precipitate disappeared, and the stirring was continued for about 4 hours. After the solution was passed through the cation exchange resin, the pH value of the solution was 6.5, and after air drying, milky yellow aluminum citrate crystals were obtained. The aluminum content in the crystal is 17.0%.

Embodiment 2

[0044] Put polyaluminum chloride in a 500ml reactor to form an aqueous solution with an aluminum ion content of about 0.5mol / L. There is undissolved polyaluminum chloride in the solution. Slowly drop Add an aqueous solution containing citrate ions of about 0.25mol / L triammonium citrate, and the undissolved aluminum salt in the solution will gradually dissolve. After the dropwise addition, continue stirring for about 4.5 hours until the solution is clear; start adding sodium hydroxide dropwise , until the pH value of the solution was 4.6, the stirring was continued for about 1.2 hours, and the resulting solution was recrystallized to obtain milky yellow aluminum citrate powder. The aluminum content in the powder was 15.7%.

Embodiment 3

[0046] Put aluminum sulfate in a 500ml reactor to form an aqueous solution with an aluminum ion content of about 0.5mol / L. There is undissolved aluminum sulfate in the solution. Slowly add citric acid containing About 0.25mol / L aqueous solution, the undissolved aluminum salt in the solution gradually dissolves, after the dropwise addition, continue to stir for about 2 hours until the solution is clear; start to add ammonia water dropwise, until the pH value of the solution is 5.6, continue to stir for about After 3.2 hours, the obtained solution passed through the ion exchange resin, the pH value of the obtained solution was 6.9, and after spray drying, milky yellow aluminum citrate crystals were obtained. The aluminum content in the crystal is 16.8%.

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Abstract

An aluminium citrate type additive for recovering petroleum has the formula of M0-2Al1-3C6H4-10O7N1-4X0.1-9, and is prepared through reaction of Al-containing aqueous solution with the aqueous solution containing radical of citric acid, adding alkaline substance or putting in ionic exchange resin for stabilizing and regulating pH value. Its advantages are high content of Al, excellent performanceand high stability.

Description

technical field [0001] The invention relates to an aluminum citrate type oil recovery additive and a preparation method thereof. Background technique [0002] In the process of oil extraction, in order to increase the oil recovery rate, it is often necessary to add polyvalent metal ions to cross-link the polymer oil recovery injection and improve the properties of the polymer. As early as 1974, Needham et al. proposed the technology of cross-linking PAM with polyvalent metal ions to control fluidity. Studies have shown that the retention resistance coefficient is 6 times higher than that of polymer alone. Thomas et al confirmed the conclusion of Needham with experiments. Parmerswar et al. conducted further research and proposed a mechanism for the decrease in permeability. He believed that there are two possibilities: one is the retention of excess polymer in the core, which occurs in the area of ​​low permeability or the molecular size of the polymer relative to the When ...

Claims

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Application Information

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Inventor 周达飞林嘉平李想袁洪海
Owner EAST CHINA UNIV OF SCI & TECH
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