Composite multi-component scale inhibitor for treating oil-field water and preparation thereof

Abstract

The invention relates to a composite multi-component scale inhibitor for oil field water treatment and a preparation method thereof. The composite multi-component scale inhibitor comprises s-propyloic sulpho succinic acid, tetramethylenediamine phosphonic acid, 2-phosphonic butane-1, 2, 4-tricarboxylic acid, hydrolyzed polymaleic anhydride, propenoic-hydroxypropyl acrylate-2-methyl-2'-acrylamide propyl sulphonic acid terpolymer, and polyepoxy succinic acid, which are mixed in weight portion, wherein active substances must reach standardized contents of the experiment. The preparation method comprises the following steps: adding the polyepoxy succinic acid into the 2-phosphonic butane-1, 2, 4-tricarboxylic acid; adding the tetramethylenediamine phosphonic acid into the hydrolyzed polymaleic anhydride; and preparing solutions of the propenoic-hydroxypropyl acrylate-2- methyl-2' -acrylamide propyl sulphonic acid terpolymer and the s-propyloic sulpho succinic acid by steps and mixing the solutions, stirring the solution evenly for 50 to 90 minutes and keeping a temperature range from 12 to 48 DEG C, and obtaining the composite multi-component scale inhibitor for oil field water treatment which has little dosage, wide application range, and can play excellent efficiency under the conditions of high alkali, high hardness and high temperature.

Description

technical field [0001] The invention relates to a scale inhibitor for oilfield water treatment used in the oilfield development process and a preparation method thereof, in particular to a composite multi-component oilfield water treatment scale inhibitor and a preparation method thereof. Background technique [0002] In the process of oilfield development, produced water and injected water contain Ca in varying degrees. 2+ , Mg 2+ 、Ba 2+ 、Sr 2+ , CO 3 2- , SO 4 2- Scaling ions such as ions, with the change of the external environment (temperature, pressure, etc.), lead to formation, wellbore and surface pipeline scaling. Common in oil fields is CaCO 3 Scale, CaSO 4 Scale, SrSO 4 Scale, BaSO 4 Scale, etc., also often put corrosion products, such as FeCO 3 , FeS, Fe(OH) 2 , Fe 2 o 3 And substances with high solubility, high content and easy precipitation under certain conditions (such as sodium chloride) are included. Scaling affects the normal production of o...

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Problems solved by technology

The existing oilfield water treatment is mainly organic phosphonic acid (such as HEDP, etc.) or its composite products, which have disadvantages such as excessive dosage, poor temperature resistance, and narrow adaptability. It is difficult to completely solve the scaling problem, and multi-agents must be used for synergistic effect. There is an urgent need for a composite multi-component scale inhibitor with low dosage, wide application range, and performance under high alkali, high hardness, and high temperature conditions.

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