A kind of modified phenolic crosslinking agent and its preparation method and application

Abstract

The invention discloses a modified phenolic cross-linking agent, a method for preparing the same and application of the modified phenolic cross-linking agent, and belongs to the technical field of oilfield chemistry. The modified phenolic cross-linking agent comprises, by weight, 90-95 parts of phenolic prepolymers and 5-10 parts of stabilizers. Reaction is carried out on phenols and formaldehyde with the molar ratio of 2.5:1-3:1 under the effect of alkali catalysts to obtain the phenolic prepolymers, and the content of hydroxymethyl in the phenolic prepolymers is 18.92-23.34%; the stabilizers comprise amino-substituted benzoic acid. The modified phenolic cross-linking agent, the method and the application have the advantages that the storage effective life of the modified phenolic cross-linking agent at the room temperature is longer than 6 months; when the modified phenolic cross-linking agent is applied to preparing cross-linked polymer gel profile control agents, the gel forming temperatures are 80-120 DEG C, the gel forming time is 24-120 h, formed gel systems are stable, the viscosity of gel can reach 8000 mPa.s at least, and the modified phenolic cross-linking agent and the method are applicable to deep profile control and flooding operation treatment for injection wells and have excellent application prospects in the aspects of increase of crude oil recovery ratios during late development of oilfields with high water cut.

Description

technical field

[0001] The invention relates to the technical field of oil field chemistry, in particular to a modified phenolic crosslinking agent and its preparation method and application. Background technique

[0002] In the middle and late stages of oilfield development, replenishing formation energy through water injection is the main measure adopted by most oilfields in my country at present. Due to the complexity and heterogeneity of the reservoir formation, when the water injection rate increases, a large amount of water will be produced from the oil well, which seriously affects the water flooding development effect. In order to improve the effect of water injection and the ultimate recovery of the oil field, the technology of water plugging and profile control of the oil layer has been paid attention to and developed in the development of oil and gas fields. The cross-linking agent can react with polyacrylamide polymers to obtain gels with different viscosities, ...

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