Rapid degradation agent for polyacrylamide and preparation method and application thereof

Abstract

The invention discloses a rapid degradation agent for polyacrylamide and a preparation method thereof. The degradation agent comprises, according to the concentration of total weight of treatment products, 0.2-1.5% of an oxidant, 0.1-0.6% of a catalyst, 0.3-2% of a regulator and 0.01-3% of an activator. The invention can realize on-site rapid degradation of polyacrylamide, especially degradation hydration of drilling fluid raffinate and crude oil using polyacrylamide as oil displacement agent in tertiary oil recovery, can achieve complete hydration in 1-2 h, and has viscosity less than 3 mpa.s; and after hydration, sediment in the drilling fluid can be rapidly settled, a demulsifier can perform the demulsification effect. The rapid degradation agent for polyacrylamide can also be used in other aspects of polyacrylamide application, and is of great significance to environmental protection.

Description

technical field [0001] The invention relates to the application of polyacrylamide in oil fields, in particular to a rapid polyacrylamide degradation agent and its preparation method and application. Background technique [0002] There is a lot of drilling fluid residue or waste in China, and the annual output is more than 500,000 M3. Oilfields usually use polyacrylamide as a thickener in drilling fluid. After construction, the drilling fluid residue contains a large amount of polyacrylamide, which makes the drilling fluid more viscous. Generally, flocculants, cement, lime and other substances are added. Ways to solidify the drilling fluid to prevent its damage to the ecological environment, but all can not fundamentally solve the damage of polyacrylamide to the environment. [0003] Polyacrylamide is used as an oil displacement agent for tertiary oil recovery. Long-term application will increase the content of crude oil. The presence of polyacrylamide will affect the effect...

AI Technical Summary

Problems solved by technology

Oilfields usually use polyacrylamide as a thickener in drilling fluid. After construction, the drilling fluid residue contains a large amount of polyacrylamide, which makes the drilling fluid more viscous. Generally, flocculants, cement, lime and other substances are added. There are many ways to solidify the drilling fluid to prevent its damage to the ecological environment, but none of them can fundamentally solve the damage of polyacrylamide to the environment.

[0003] Polyacrylamide is used as an oil displacement agent for tertiary oil recovery. Long-term application will cause the content of crude oil to increase. The presence of polyacrylamide will affect the effect of crude oil demulsifier and make the demulsifier invalid. It is the bottleneck of demulsifier research in the field of tertiary oil recovery.

[0004] The current domestic use is basically to treat polyacrylamide with strong oxidizing substances such as chlorine dioxide. It has not been applied industrially, the reaction time is long, and there are many residues, so it cannot be completely degraded. Research and development is needed to quickly degrade polyacrylamide. Water-like substances to solve the impact of the presence of polyacrylamide on subsequent applications in drilling fluid residues, tertiary oil recovery, etc.

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