Preparation method of profile control agent cellulose ether for oil extraction

Abstract

The invention discloses a preparation method of a profile control agent cellulose ether for oil extraction. The preparation method comprises the following steps: S1, preparing methyl cellulose ether,polyacrylamide, resin, a heat stabilizer and organic fiber particles; S2, adding the methyl cellulose ether, the polyacrylamide, the resin and the heat stabilizer into water, mixing, and stirring for20 minutes to ensure that various raw materials are fully dissolved; and S3, enabling the mixture system to contain a plurality of functional groups, such as a hydroxyl group, a carboxyl group, a methoxyl group, a double bond, an ether bond, a silicon-oxygen bond and an aryl group, and enabling the groups introduced into the system to easily react in order to generate a cross-linked three-dimensional network structure. The temperature resistance of the system can be improved after the silicon-oxygen bond, the aryl group and the ether bond are introduced into the molecular chain, and the polymer can form the cross-network structure with the hydroxyl group and the methoxy group. The profile control channeling sealing success rate of the thickened oil steam injection well is obviously improved, meanwhile, the oil increasing effect is also obviously improved, the product is also suitable for water plugging of an oil well at the temperature of 150-200 DEG C, and the application range is enlarged.

Description

technical field [0001] The invention relates to the technical field of oilfield exploitation, in particular to a preparation method of profile control agent cellulose ethers for oil exploitation. Background technique [0002] Heavy oil steam injection production has been developed to the middle and late stage, and relatively large steam channeling channels have been formed. Profile control and sealing channeling are one of the main measures for heavy oil steam injection production and the technical guarantee for improving the recovery rate of heavy oil gas injection wells. [0003] The temperature resistance of polyacrylamide gels of existing profile control agents is less than 150°C. By filling the profile control agent with solid phase particles with a temperature resistance of 300°C, the temperature resistance of the profile control system can reach 300°C. In the process of steam injection, the temperature of the oil layer steam channeling channel generally exceeds 150 °C...

AI Technical Summary

Problems solved by technology

During the steam injection process, the temperature of the channel of steam channeling in the oil layer generally exceeds 150°C, and the polymer gel part is hydrated rapidly, so the profile control and channeling can only be carried out by the solid phase particles. Therefore, we propose a preparation method of cellulose ethers as a profile control agent for oil production