Salt (hot) thickening water-soluble polymer

Abstract

The invention relates to a salt (heat) thickness increment water solubility polymer, which is formed by copolymerizing a nonionic monomer and a nonionic large monomer. For the two nonionic monomers, one of which is the nonionic large monomer provided with surface activity, the other one is nonionic monomer acrylamide. The polymer is characterized in that the characteristic of hydrophobic association water solubility polymer salt (heat) tackifying increment is provided, and simultaneously, because copolymer is produced through opposite phase microemulsion, the dissolution velocity of the copolymer is quicker than that of the conventional hydrophobic association water solubility polymer, thus disadvantages of slow dissolution velocity and poor dissolution property of the conventional hydrophobic association water solubility polymer are overcome; in addition, because of adopting the monomer copolymerization from which ionogenic group is excluded, the polyelectrolyte effect can be furthest avoided. Therefore, the novel salt (heat) thickness increment water solubility polymer relating with the invention has the advantages of good water solubility and good salt (heat) tackifying increment, and the like, thus the novel salt (heat) thickness increment water solubility polymer can be applied in industries of oil production, sewage treatment and water solubility coating materials, and the like.

Description

technical field [0001] The invention relates to a salt (heat) thickened water-soluble polymer and a synthesis method thereof, belonging to the field of water-soluble polymers. Background technique [0002] In my country, many oil fields have entered the stage of stable production and production decline. The distribution of remaining oil is mainly concentrated in the low-permeability and specially-permeable oil fields buried below 3,500 meters in the northwest and east. The main oil fields have entered the stage of high water cut, especially Daqing Oilfield The comprehensive water cut of Heshengli Oilfield is as high as 88%. In my country, the average oil recovery rate is about 30%, that is to say, more than 60% of the crude oil still exists in the formation and cannot be recovered. Looking at the 6 blocks invested in Daqing Oilfield in 1996, most of them have been recovered. Enter the follow-up water stage. By December 2002, the average polymer consumption had reached 725.7P...

AI Technical Summary

Problems solved by technology

But with respect to above two kinds of polymers, all have its weak point: (1) polyacrylamide polymer, because it contains a large amount of acrylic acid (sodium), the carboxylate in the polymer and Ca 2+ , Mg 2+ Ion combination, easy to produce precipitation and make the solution phase separation, the viscosifying ability of the polymer solution is significantly reduced, and the temperature rises, the viscosity drops sharply; (2) Xanthan gum is a natural product, its antioxidant capacity and anti-biodegradation ability Very low, prone to degradation in both environments

At present, French scientists have designed a single heat-thickening water-soluble polymer, and a lot of research has been done on single-salt thickening at home and abroad, but the use environment is often the sum of multiple influencing factors, which limits their application.

Images