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 re

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0041] Example one

[0042] Place aluminum chloride in a 500ml reactor to prepare an aqueous solution with an aluminum ion content of about 0.5mol / L. There is undissolved aluminum chloride in the solution. Under the conditions of 80°C and constant stirring, slowly add the contained aluminum chloride dropwise. The aqueous solution of citric acid is about 0.25mol / L. The undissolved aluminum salt in the solution gradually dissolves. After the dripping is completed, continue to stir for about 0.5 hours until the solution is clear; start dripping ammonia water. When the pH value is 1.4, there is White precipitates are generated, until the pH of the solution disappears at 4.0, the stirring is continued for about 4 hours. After the solution is passed through the cation exchange resin, the pH of the solution is 6.5. After air drying, creamy yellow aluminum citrate crystals are obtained. The aluminum content in the crystal is 17.0%.

Example Embodiment

[0043] Example two

[0044] Place the polyaluminum chloride in a 500ml reactor to prepare an aqueous solution with an aluminum ion content of about 0.5 mol / L. There is undissolved polyaluminum chloride in the solution. Under the conditions of 33°C and constant stirring, slowly drip Add an aqueous solution containing citrate ions about 0.25mol / L triammonium citrate, the undissolved aluminum salt in the solution will gradually dissolve, after the addition is complete, continue to stir for about 4.5 hours until the solution is clear; start adding sodium hydroxide dropwise , Until the pH value of the solution is 4.6, continue to stir for about 1.2 hours, the obtained solution is recrystallized to obtain milky yellow aluminum citrate powder. The aluminum content in the powder is 15.7%.

Example Embodiment

[0045] Example three

[0046] Place aluminum sulfate in a 500ml reactor to prepare an aqueous solution with aluminum ion content of about 0.5mol / L. There is undissolved aluminum sulfate in the solution. Slowly add citric acid dropwise at 78°C under constant stirring. About 0.25mol / L aqueous solution, the undissolved aluminum salt in the solution gradually dissolves. After the addition is complete, 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 about After 3.2 hours, the obtained solution was subjected to ion exchange resin, and the pH value of the obtained solution was 6.9. 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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