Barium-strontium scale inhibitor

Abstract

The invention relates to a barium-strontium scale inhibitor, belongs to the technical field of industrial water treatment agent designing and is especially suitable for water containing barium-strontium scale and calcium-barium-strontium composite scale in the oil field. A terpolymer and poly(sodium epoxysuccinate) are compounded according to a mass percent ratio of 1: 0.1-5.0 to form the barium-strontium scale inhibitor. Maleic anhydride is added with acrylic acid or methacrylic acid and acrylic acid ester and the mixture undergoes a copolymerization reaction under the action of potassium persulphate as an initiator to produce the terpolymer. A hydrolysate of maleic anhydride and sodium hydroxide is added with sodium tungstate as a catalyst and hydrogen peroxide as an oxidizing agent, the mixture undergoes a reaction to produce sodium epoxysuccinate, the sodium epoxysuccinate is added with a sodium-calcium compound alkali as an initiator and the mixture undergoes a polymerization reaction to produce the poly(sodium epoxysuccinate). The barium-strontium scale inhibitor does not contain phosphorus, has a small use amount and good effects, can be effectively used for preventing barium-strontium scale, calcium scale and calcium-barium-strontium composite scale in the oil field, has excellent barium-strontium scale inhibition performances, has a low cost, can be prepared by a simple method and is environmentally friendly.

Description

Technical field: [0001] The invention relates to a barium-strontium scale inhibitor, which belongs to the technical field of industrial water treatment agent design, and is especially suitable for water bodies containing barium-strontium scale and calcium-barium-strontium composite scale in oil fields. Background technique: [0002] Fouling is a widespread phenomenon and is a thermodynamically spontaneous process. Scaling in oilfields will bring many problems to production. Scaling in oil layers and areas near wells will block oil and gas channels, reduce oil layer permeability, and reduce oil well fluid production. Scaling in water injection systems will increase water injection pressure and increase energy consumption. Reduced production capacity; scaling on the surface of pipes and equipment can cause subscale corrosion or even perforation. With the deepening of oilfield development, the content of barium and strontium ions in formation water and oilfield produced water ...

AI Technical Summary

Problems solved by technology

Chinese patent CN101012090A discloses a barium strontium scale inhibitor, but because it is a phosphonic acid copolymer, it is easy to cause pollution to the environment and its use is limited

Chinese patent CN1491908A discloses a barium strontium scale inhibitor, which is composed of sodium tripolyphosphate, ethylenediaminetetraacetic acid and other substances. The preparation method is cumbersome and the cost is high when used.

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