Polyacrylamide aqueous solution mine sampling viscosity stabilizer and its application method

Abstract

The invention provides a polyacrylamide aqueous solution mine-field sampling viscosity stabilizing agent. The polyacrylamide aqueous solution mine-field sampling viscosity stabilizing agent is prepared from a Fe2+ ion complexing agent, a radical scavenger, and a deoxidant at a molar ratio of 2:0.5-1.5:0.5-1.5. The Fe2+ ion complexing agent is dipyridyl; the radical scavenger is a phenol mixture, and the phenol mixture is composed of phenol and resorcinol at a molar ratio of 3:0.5-1.5; and the deoxidant is thiourea. The polyacrylamide aqueous solution mine-field sampling viscosity stabilizing agent is capable of avoiding viscosity reduction of polyacrylamide aqueous solution in sampling processes caused by degradation; it is shown by comparing mine-field sampled polyacrylamide aqueous solution with in-door simulated polyacrylamide aqueous solution that mine-field sampling is capable of ensuring authenticity of sampling viscosity, and excellent application effect of mine-field sampling is achieved.

Description

technical field [0001] It is mainly used for sampling polyacrylamide solution in polymer injection block of oil field. Background technique [0002] At present, polymer flooding has become one of the effective ways to enhance oil recovery in the middle and later stages of development of integrated high water-cut oilfields. When sampling the polyacrylamide solution in the polymer injection block, it was found that the viscosity of the sample was significantly lower than that of the solution prepared in the room, and the sampling could not reflect the true viscosity of the polyacrylamide solution at the wellhead. Mines generally use clean water to prepare polyacrylamide mother liquor, and then mix it with sewage in the water injection pipeline in proportion and inject it into the well. The study found that because the sewage is in a closed and strongly reducing environment, iron ions form Fe 2+ It exists in the form of ions. When sampling, the polyacrylamide solution is expo...

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Problems solved by technology

When sampling the polyacrylamide solution in the polymer injection block, it was found that the viscosity of the sample was significantly lower than that of the solution prepared in the room, and the sampling did not reflect the true viscosity of the polyacrylamide solution at the wellhead