Polymeric chemical blocking remover

Abstract

The invention provides a polymeric chemical blocking remover which is prepared from the following raw materials in parts by mass: 1.5-5 parts of a solid oxidizing agent, 0.5-2.5 parts of a catalyst, 0-1 part of a strippant, 0-1 part of a penetrating agent, 0-1 part of a ferric ion stabilizer and 2-5 parts of a corrosion inhibitor, wherein the solid oxidizing agent is urea peroxide; the catalyst is formic acid, acetic acid, citric acid, hydrochloric acid, oxalic acid, sulfamic acid and various substituents, Na2CO3, NaOH, sodium sulfite, sodium hydrogen sulfite, formaldehyde or thiourea; the strippant is urea, PEG-400 or ethanol amine; the penetrating agent is a nonionic surfactant; the nonionic surfactant is fatty alcohol-polyoxyethylene ether; the ferric ion stabilizer is citric acid, acetic acid, nitrilotriacetic acid or ethylene diamine tetra acetic acid; and the corrosion inhibitor is formaldehyde, acetaldehyde, benzaldehyde, butanedial or glutaraldehyde.

Description

Technical field: [0001] The invention relates to a chemical plugging-removing agent in the field of oil recovery, in particular to a chemical plugging-removing agent suitable for polymer flooding injection wells and subsequent water flooding wells after polymer flooding. Background technique: [0002] Polymer flooding has the characteristics of simple technology and large range of enhanced oil recovery. Since it was proposed in 1960, polymer flooding experiments have been carried out in more than 200 oil fields or blocks around the world. China's polymer flooding technology has developed rapidly since it was proposed in the 1990s. Daqing, Shengli, Xinjiang, Jilin, Liaohe, Henan, Jianghan, Dagang and other major oil fields have successively launched polymer flooding projects. It reached more than 400 million tons. However, during the injection process, the polymer will be subject to formation adsorption, mechanical trapping, etc., and it is very easy to stay in the porous me...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to overcome the problems existing in the prior art, such as the poor stability and unsafeness of the deblocking products using oxidants such as hydrogen peroxide and chlorine dioxide, and the poor water solubility of solid oxidants such as sodium percarbonate, which is not conducive to on-site application, etc., and to provide a Good stability, easy storage and transportation, and non-toxic, odorless, non-polluting and safe polymer chemical plugging agent for polymer flooding or subsequent water flooding wells

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