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Preparation process of slow cross-linking agent for acrylic amide gel

A technology of polyacrylamide gel and retarding cross-linking agent, which is applied in the direction of earthwork drilling, mining fluid, wellbore/well parts, etc., and can solve the problems of low gel strength and high cost of cross-linking agent

Inactive Publication Date: 2005-01-05
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The main problem of the currently used organic acid chromium is that the gel strength formed after crosslinking is low and the cost of the crosslinking agent is high

Method used

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Examples

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Comparison scheme
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Embodiment Construction

[0011] The preparation process of the present invention will be specifically described below in conjunction with the examples.

[0012] Prepare raw materials: sodium dichromate, concentrated sulfuric acid, sodium sulfite, humic acid, acetic acid, citric acid, 40% sodium hydroxide solution, water.

[0013] Pass cooling water to the reaction kettle, add 200.0kg of water into the reaction kettle, turn on the mixer, add 143.6kg of sodium chromate, and then slowly add 158.2kg of concentrated sulfuric acid, stir and react for 1 hour, slowly add 40.5kg of humic acid, and react for 0.5 hours , add 38.9kg sodium sulfite, add 79.8kg lactic acid, 156.4kg acetic acid after dissolving. After stirring evenly, slowly add 182.6 kg of sodium hydroxide solution with a concentration of 40%, and discharge after stirring evenly.

[0014] How to use slow cross-linking agent for polyacrylamide gel: under stirring condition, slowly add slow cross-linking agent for polyacrylamide gel into the prepare...

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Abstract

The invention provides a method of preparing sustained cross-linking agent for polypropylene acylamide gel, using sodium bichromate, oil of vitriol, sodium sulfite, humic acid, acetic acid, citric acid, 40% NaOH solution and water as raw materials, charging cooling water in a vitreous enamel reaction kettle, adding water in 50%-5% in the kettle, starting a blender, adding in sodium bichromate in 10%-18%, then slowly adding in oil of vitriol in 10%-18%, blending and reacting for 1 hour, slowly adding in humic acid in 3%-6% to react for 0.5 hour, adding in sodium sulfite in 2%-5%, dissolving and then adding in citric acid in 5%-10% and acetic acid in 10%-18%, blending uniformly and then slowly adding in 40% NaOH solution in 10%-20%, blending uniformly and making it at once.

Description

Technical field: [0001] The invention relates to a preparation method of an oil field chemical agent, especially a slow crosslinking agent for polyacrylamide gel. Background technique: [0002] Weak gel control and flooding technology has been developed on the basis of gel water plugging technology in foreign countries in recent years. It is a method that has both technical characteristics of polymer gel water plugging and reservoir internal fluid fluidity regulation, with less polymer consumption and wide adaptability. Since the "Ninth Five-Year Plan", in order to meet the requirements of tapping the potential of thick oil layers, domestic tests of weak gel profile control and oil displacement have been carried out. So far, some progress has been made in both indoor and field tests. For example, in 1997, Jilin Oilfield used weak gel to control and drive 220 wells, with an annual production increase of 22,329 tons, 124 tons of polymer per ton of oil, and an input-output ra...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08K5/092C08L33/26E21B43/22
Inventor 孙铭勤张贵才葛际江宋昭峥
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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