Deblocking agent for decontamination of high molecular polymer, preparation method and application thereof

Abstract

The invention discloses a blocking removing agent for removing the pollution of high molecular polymer and its preparation method and application. The blocking remover for decontamination of high molecular polymers includes a first blocking agent and a second blocking agent; wherein, the first blocking agent includes paraffin oil, tallow propylene diamine, ammonium chloride and calcium oxide; the second plugging agent includes a main agent and a first solvent; the main agent includes a second solvent, sodium carbonate, biuret, sodium nitrite and sodium α-alkenyl sulfonate. The present invention also provides a preparation method and application of a blocking removing agent for removing the pollution of the high molecular polymer. The blocking removing agent for removing the pollution of high molecular polymer provided by the invention does not use strong oxidizing raw materials, can effectively remove the blocking of the polymer, and has good blocking removing performance; the chemical stability is good, and the deep blocking removal can be carried out. Treatment; can effectively solve the problem of difficult implantation in the existing process.

Description

technical field [0001] The invention relates to the technical field of oil production in oil fields. More specifically, it relates to a blocking removing agent for removing the pollution of high molecular polymer and its preparation method and application. Background technique [0002] Polymers have played an important role in oilfield development and are mainly used in polymer flooding, chemical flooding, and high-dose deep profile flooding. Because the adsorption, retention and mechanical trapping of polymers in the formation porous media can easily lead to formation plugging, the formation liquid absorption generally decreases after plugging. Sampling and analysis of the revomited material from the plugged well site operation found that the polymer formation blockage is a black viscoelastic jelly, which is mainly composed of water, oil, polymer and its cross-linked gel, mud sand and inorganic impurities. Substances are intertwined together, and the components are diffic...

AI Technical Summary

Problems solved by technology

Through the sampling and analysis of the vomitus in the field operation of plugged wells, it is found that the polymer formation plugs are black viscoelastic jelly, mainly composed of water, oil, polymers and their cross-linked gels, mud and sand, and inorganic impurities. Substances are wrapped together, and it is difficult to effectively separate the components without using chemical methods

[0003] At present, there are generally the following technical problems in the technology of polymer blockage removal: first, the complexity of polymer blockages is ignored, and only focus on the blockage removal of polymers and their cross-linked gel blockages, ignoring oil pollution and various Inorganic plugging is also an important cause of formation plugging; second, the differences in physical and chemical properties of various plugging materials are not considered, and it is difficult to effectively contact and react with corresponding plugging materials; 2 to 3 meters, ignoring the blockage in the deep formation, and failing to achieve the purpose of deep blockage removal

Fourth, most of the plug-removing agents used are strongly oxidizing, and the oxidizing solution is very unstable, and it is not easy to store for a long time, and it cannot be stored in metal containers, and direct sunlight is strictly prohibited.

In the field application process, there are great safety hazards, and there are also problems such as too fast response speed, short effective action distance, and difficulty in achieving deep plugging removal.