Neutral blockage removing agent composition used for oilfield mechanical recovery well and preparation method thereof

Abstract

The invention relates to a neutral blockage removing agent composition used for a mechanical recovery well in an oilfield. The neutral blockage removing agent composition is prepared from the following components in parts by weight: 16-20 parts of polyepoxysuccinic acid amine, 7-12 parts of hydroxyethylidene dipllosphate sodium, 21-25 parts of divinyl pentaacetic acid amine, 20-25 parts of hydroxyl ammonium acetate, 12-16 parts of activated attapulgite, 21-25 parts of ammonium persulfate, 9-12 parts ofdicyclohexyl sulfobutanedioate sodium, 7-9 parts of butyl lactate, 0.2-0.3 part of vanadium pentoxide, 5-8 parts of straight chain sodium dodecylbenzenesulfonate, 10-14 parts of nitrilotriacetic acid sodium salt, 4-7 parts of urotropin and 0.1-0.3 part of glycerin fatty acid ester. The neutral blockage removing agent composition is suitable for scale removal and blockage removal of an oil pumping unit well and a screw pump well, can effectively control the reaction speed of the blockage removing agent and the scale of the oil pumping unit well and the scaled screw pump well, and prevent the falling-off of big scale residues to result in the secondary blockage of the mechanical recovery well and an oil recovery pump thereof, has high blockage removal speed, is neutral and is free of corrosion; the waste liquid for blockage removal does not need to be discharged onto the ground to be subjected to sewage treatment, the blockage removal time does not exceed 24 hours, and the effect of safe and corrosion-free blockage removal is achieved.

Description

technical field [0001] The patent of the present invention relates to an auxiliary agent used in oil recovery in oil fields, in particular to a neutral descaling and plugging removal agent composition for mechanical production wells in oil fields, and also relates to a preparation method for the neutral descaling and blocking removal agent composition for mechanical production wells in oil fields. Background technique [0002] The oil recovery of the oil field has entered the stage of high water cut development, and ASP flooding is one of the important technologies to ensure continuous and stable production. Oil recovery by ASP flooding is to add a certain amount of petroleum sulfonate surfactant, caustic soda and polyacrylamide polymer with large molecular weight to the injected water to greatly reduce the oil-water interfacial tension and increase the viscosity of injected water, thereby reducing the oil-water interfacial tension. The oil-water mobility ratio expands the m...

AI Technical Summary

Problems solved by technology

The consequences are: scale deposits block the oil layer; after scale deposits, in the production well tubing and gathering pipelines, it is easy to cause pipeline blockage and oil production pumps to fail to work normally

[0004] In the field test of ASP flooding, it was found that the most prominent problem was the serious scaling of the production well, which led to the deterioration of the operating environment of the wellbore, and the phenomenon of rod lag, rod breakage, and pump jam often occurred, resulting in an increase in the pump inspection rate of the mechanical production well. , the pump inspection cycle is shortened, and the shortest pump inspection cycle is less than one month, which seriously affects the normal production of mechanical recovery wells

At present, anti-scaling measures for production wells include adding anti-scaling agents and anti-scaling pumps at the wellhead, but the effect is not ideal. Pumps are stuck and rods are broken frequently due to scale checks; the three-component compound scale removal is mainly based on acidic agents. Although it can effectively dissolve scale, it is highly corrosive to rods, pipes, pumps and downhole tools, and cannot descale the screw pump well. After descaling, the waste liquid needs to be returned to the ground for treatment, which is serious Constrained the popularization of ASP flooding technology