A polymer polyacrylamide degrading and plugging-removing agent for oil recovery and its preparation method

Abstract

The invention discloses a polymer polyacrylamide degrading and plugging-removing agent for oil recovery in an oil field and a preparation method thereof, which comprises the following raw materials in weight percent: 10% to 30% of ammonium salt A, 20% to 40% of ammonium salt B, and 20% of sulfate compound %-40%, surfactant 0.1%-0.5%, anti-corrosion and reaction speed control agent 10%-40%, anti-corrosion and dispersant 5%-15%. The invention not only has a good degradation effect on high-molecular polyacrylamide, but also has no corrosion on equipment, and can control the degradation reaction speed of polyacrylamide, and can meet the plugging removal requirements of polymer injection wells under different conditions. This product is a solid powder, and after being dissolved in water, the oxidant is slowly released above 40°C. This product is convenient and safe to store.

Description

technical field [0001] The invention belongs to the technical field of chemical additives for oil recovery in oil fields, and in particular relates to a polymer polyacrylamide degrading plug-removing agent for oil recovery in oil fields and a preparation method thereof. Background technique [0002] Polyacrylamide is a kind of linear water-soluble polymer compound with a wide range of uses. With the popularization of new polymer flooding tertiary oil recovery technology and the increase of oil displacement difficulty, on the one hand, more and more polyacrylamide is discharged with produced water. On the other hand, the problem of clogging caused by polymers is becoming more and more serious. Due to the current blockage removal technology and wastewater treatment facilities in oilfield polymer injection wells in my country, it is difficult to effectively and completely degrade polyacrylamide residue, and the ecological environment of oilfields has deteriorated sharply. Ther...

AI Technical Summary

Problems solved by technology

[0003] At present, it is difficult for my country's oilfield wastewater treatment facilities to effectively degrade polyacrylamide. There are many methods and technical measures in various oilfields to solve the problem of blockage of polymer injection wells, such as chlorine dioxide plugging removal technology, specific enzyme chain breaking technology, and surface activity of polymer injection wells. agent injection technology, high-pressure water jet and chemical compound plugging removal method, hydraulic vibration plugging removal method, hydraulic fracturing plugging removal method, temporary plugging acidification technology and hydraulic slotting technology, etc. All of them have certain limitations, the application conditions and construction equipment requirements are relatively high, and some technological methods still have potential dangers, which are not easy to be popularized and applied on a large scale.