A polymer degradation agent

Abstract

The present invention provides a polymer degradation agent, which comprises, by mass, 70% of ammonium sulfate, 5-10% of ammonium persulfate, 1-3% of amino trimethylene phosphonic acid, 1-2% of ethylenediaminetetraacetic acid, 3% of an emulsifying agent, 2% of a surfactant, and the balance of water, wherein the emulsifying agent is OP, and the surfactant is dodecyl dimethyl benzyl ammonium chloride. With the polymer degradation agent, free radicals can be produced at a lower temperature, the polymer solution with the high viscosity can be rapidly degraded into the solution with the viscosity close to the viscosity of water, pollution and damage of the polymer solution on the stratum can be effectively relieved, and the seepage capability of the polluted stratum can be recovered. In addition, the polymer degradation agent has characteristics of good site application effect, simple process, and low condition and equipment requirement, and is easy to promote and apply.

Description

technical field

[0001] The invention belongs to the field of petroleum development, in particular to a polymer degradation agent. Background technique

[0002] When the water cut in the oil field rises to the economic limit at the end of secondary oil recovery, new technologies other than water injection must be used for production, mainly injecting chemical agents, gas solvents or thermal recovery into the oil layer to perform tertiary recovery of the oil layer, which is what we usually call tertiary production. oil recovery. At present, most oil fields at home and abroad are in the process of or gradually turning to tertiary oil recovery. At present, polymers are usually injected into the oil formation according to the difference in the mobility ratio of oil and water in the rock formation during the tertiary oil recovery process. The viscosity of the polymer is very high, which can block large pores, prevent formation water from flowing to the oil well, and can drive an...

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