Neutral blockage removing agent composition used for oil recovery formation in oilfield and preparation method thereof

Abstract

The invention relates to a neutral blockage removing agent composition used for an oil recovery formation in an oilfield. The neutral blockage removing agent composition is prepared from the following raw materials in parts by weight: 10-14 parts of polyepoxysuccinic acid amine, 35-40 parts of diethylenetriaminepentaacetic acid amine, 33-37 parts of hydroxyl succinic acid amine, 20-25 parts of polyacrylamide, 7-10 parts of sodium polyaspartate, 10-14 parts of sodium gluconate, 10-15 parts of activated clay, 20-25 parts of potassium peroxodisulfate, 9-11 parts of hydroxyl butanedioic acid amine, 4-7 parts of sodium salicylate, 5-9 parts of hexamethylene tetramine, 0.2-0.3 part of vanadium pentoxide, 2-5 parts of starch, 5-8 parts of alpha-sulphonated fatty acid methyl ester and derivative thereof (MES) and 0.1-0.3 part ofdiethyl ethanolamine. The neutral blockage removing agent composition is used for the blockage removal of an oil pumping well and a screw pump well in the oilfield, can effectively solve the problems of cleaning blockage removal of the oil pumping well and the screw pump well in the oilfield and the corrosion of oil recovery equipment, has high blockage removing speed, is neutral and is free of corrosion; waste liquid for blockage removal can be degraded and does not need to be discharged onto the ground to be subjected to sewage treatment, no corrosion, dead angle, precipitation or secondary well blockage are generated, and more safety and more reliability are realized as compared with traditional pickling blockage removing, biological blockage removing and solvent blockage removing.

Description

technical field [0001] The invention relates to an auxiliary agent used in oil production in oil fields, in particular to a neutral block-removing agent composition for oil production wells in oil fields, and also relates to a preparation method for the neutral plug-removing agent composition for oil production wells in oil fields. Background technique [0002] Formation water in oilfields forms scales due to changes in temperature, pressure and other conditions, which makes the corrosion and scaling of water injection development oil production systems and gathering and transportation system equipment more and more serious with the production age. In some oilfields, oil production wells and oil pumps have scaling and clogging Oil production wells and pipelines are scrapped due to corrosion and perforation. Therefore, the problem of corrosion and scaling of oil production wells and pumps has been paid more and more attention by people. [0003] Through X-ray diffraction, mo...

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Problems solved by technology

[0007] (3) Harmful ions injected into oilfield formations, such as anions and scale-forming cations, will cause scaling and corrosion in water injection wells, oil production wells and oil production pumps. Scale and corrosion products can easily cause formation pores and clogging of oil wells and pumps

[0008] (4) The injected clean water and re-injected sewage are mostly two types of water that are incompatible with each other. The mixed use of incompatible water will result in more serious scaling, and will also generate corrosion under the scale to produce corrosion dirt

[0009] (5) Harmful bacteria contained in water, such as sulfuric acid reducing bacteria, iron bacteria, etc., can cause bacterial corrosion and produce scales of bacterial corrosion products.

[0010] (6) The oil production in the oil field has entered the stage of high water cut development. ASP flooding is one of the important technologies to ensure continuous and stable production. Rod lagging, rod breaking, pump stuck and stuck often occur on site, seriously affecting the normal oil production of oil production wells

[0011] At present, acidification is mainly used to remove plugging. Acidification and plugging removal are prone to produce scale residue and secondary sediment, resulting in secondary blockage of production wells and stuck oil pumps; Improper and other factors cause corrosion to oil production equipment, etc.