Production method of water-soluble phenolic resin cross-linking agent used for water shut-off and profile control of oil field

Abstract

The invention provides a production method of a water-soluble phenolic resin cross-linking agent used for water shut-off and profile control of an oil field. The method comprises the following steps of: sequentially adding methanal, phenol and sodium hydroxide to a reaction kettle and mixing to obtain a mixed material, wherein a mass ratio of methanal to phenol is (2.12-2.57):1; pumping the mixed material in the reaction kettle into a cooler; cooling the mixed material to flow back to the reaction kettle; and performing circulating cooling to allow the temperature of the mixed material in the reaction kettle not to be changed any more. According to the method, heat generated by a reaction is radiated by the cooler timely, so that a reaction between methanal and phenol is mainly a primary reaction, and is prevented from being transited to tertiary hydroxyphenol and quaternary hydroxyphenol; end products are mainly primary hydroxyphenol and secondary hydroxyphenol, and a small amount of free aldehyde and free hydroxyphenol; and the activity of the cross-linking agent for forming weak gel with HPAM (Hydrolyzed Polyacryamide) is improved.

Description

technical field [0001] The invention relates to a production method of a water-soluble phenolic resin cross-linking agent. The cross-linking agent forms a weak gel with HPAM (hydrolyzed polyacrylamide) at a certain temperature and is used in oil fields to improve the formation water absorption profile and liquid production profile. Background technique [0002] The production method of the existing water-soluble phenolic resin cross-linking agent is: add formaldehyde and phenol to the reaction kettle, after heating to 50-60 ° C, add sodium hydroxide dropwise or in batches under the condition of stirring, and in the middle stage of the reaction Concentrate by vacuum filtration, cool down to normal temperature with cold water or freezing liquid in the later stage, and then pack. This method will easily lead to too high content of tertiary hydroxyphenols and quaternary hydroxyphenols in the product, which will reduce the activity of the crosslinking agent. Contents of the inve...

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Problems solved by technology

[0002] The production method of the existing water-soluble phenolic resin cross-linking agent is: add formaldehyde and phenol to the reaction kettle, after heating to 50-60 ° C, add sodium hydroxide dropwise or in batches under the condition of stirring, and in the middle stage of the reaction Concentrate by vacuum filtration, cool down to normal temperature with cold water or freezing liquid in the later stage, and then pack. This method will easily lead to too high content of tertiary hydroxyphenol and quaternary hydroxyphenol in the product, which will reduce the activity of the crosslinking agent

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