Macromolecular polyacrylamide degrading plug removing agent for oil extraction in oil field and preparation method thereof

Abstract

The invention discloses a macromolecular polyacrylamide degrading plug removing agent for oil extraction in an oil field and a preparation method thereof. The macromolecular polyacrylamide degrading plug removing agent for oil extraction in the oil field comprises the following raw materials in percentage by weight: 10 to 30 percent of ammonium salt A, 20 to 40 percent of ammonium salt B, 20 to 40percent of a sulfate compound, 0.1 to 0.5 percent of a surfactant, 10 to 40 percent of an anti-corrosion and reaction speed control agent and 5 to 15 percent of an anti-corrosion and dispersing agent. The macromolecular polyacrylamide degrading plug removing agent for oil extraction in the oil field has a good degrading effect on macromolecular polyacrylamide, and no any corrosion is caused to equipment, the degrading reaction speed of polyacrylamide can be control and the plug removing requirement of a polymer injection well under different conditions can be met. The product is solid powderand can slowly release an oxidizing agent at the temperature of 40 DEG C or more than 40 DEG C after being dissolved into water; and the product is convenient to store and safe.

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...

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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.