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Corrosion and scale inhibition reagent for oil and gas fields and preparation method thereof

A technology for corrosion and scale inhibition, oil and gas fields, applied in chemical instruments and methods, scale removal and water softening, special treatment targets, etc. , to meet the performance requirements of high pressure CO2 corrosion resistance, corrosion inhibition, mild conditions

Inactive Publication Date: 2020-09-04
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Adding reagents separately will also have compatibility and antagonism problems between scale and corrosion inhibitors, and also increases production costs

Method used

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  • Corrosion and scale inhibition reagent for oil and gas fields and preparation method thereof
  • Corrosion and scale inhibition reagent for oil and gas fields and preparation method thereof
  • Corrosion and scale inhibition reagent for oil and gas fields and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] Take 100ml of distilled water to dissolve 1g of ammonium persulfate, add 4g of acrylic acid monomer, 0.5g of acryl urea and 8g of isopropanol, adjust the pH of the solution to 7 with a mass fraction of 0.1% NaOH solution, adjust the temperature to 68°C, and stir evenly for pre-treatment. Poly 0.5h.

[0044] 20 g of acrylic acid monomer and 2 g of ammonium persulfate were dissolved in 40 g of water, and the pH value of the solution was adjusted to 6 with 0.1% NaOH solution. 5.3 g of allyl urea was dissolved in 10 g of ethanol. At the same time, use two dropping funnels to add the above two reactants dropwise to the reaction system for about 1 hour. Raise the temperature to 90°C, condense and reflux for 3h, and collect the product as a yellow solution.

[0045] The product prepared by the present invention is carried out infrared test, figure 1 Acrylic acid and propylene urea polymerization product infrared test spectrum, infrared analysis results show: 3201cm -1 to 2...

Embodiment 2

[0054] a. Using distilled water as a solvent, add a certain amount of acrylic acid, and adjust the pH of the solution to 6 with a mass fraction of 0.13% NaOH solution. Add isopropanol, allyl urea and a small amount of ammonium persulfate, and carry out prepolymerization at 60°C, and the reaction time is 0.5h.

[0055] b. Dissolve the remaining acrylic acid and ammonium persulfate in water, adjust the pH of the solution to 7 with a mass fraction of 0.13% NaOH solution, and call it solution A. Dissolve the remaining allyl urea in a certain amount of ethanol, and record it as solution B.

[0056] c. Slowly add the above two solutions of A and B to the reaction system at the same time. After adding the liquid, raise the temperature to 90°C, condense and reflux and continue to stir for 3 hours to collect the product.

Embodiment 3

[0058] a. Using distilled water as a solvent, add a certain amount of acrylic acid, and adjust the pH of the solution to 9 with a mass fraction of 0.1% NaOH solution. Add isopropanol, allyl urea and a small amount of ammonium persulfate, and carry out prepolymerization at 75° C., and the reaction time is 1 h.

[0059] b. Dissolve the remaining acrylic acid and ammonium persulfate in water, adjust the pH of the solution to 9 with a 0.1% NaOH solution, and call it solution A. Dissolve the remaining allyl urea in a certain amount of ethanol, and record it as solution B.

[0060] c. Slowly add the above two solutions of A and B to the reaction system at the same time. After adding the liquid, raise the temperature to 95°C, condense and reflux and continue to stir for 4 hours to collect the product.

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Abstract

The invention discloses a corrosion and scale inhibition reagent for oil and gas fields and a preparation method thereof. The integrated reagent has both corrosion inhibition performance and scale inhibition performance. The reagent is formed by polymerizing acrylic acid (sodium) and allyl urea, and has a structural formula shown in formula (I) (See the specification). The preparation process is simple, the requirement for high-pressure CO2 corrosion resistance can be met and a scale inhibition effect can be achieved by controlling the proportion of reaction raw materials, and particularly, the corrosion and scale inhibition reagent has an obvious effect on inhibition of scaling of Ca<2+> and Mg<2+>.

Description

technical field [0001] The invention relates to a corrosion and scale inhibition agent for oil and gas fields and a preparation method thereof. The invention belongs to the technical field of oil and gas field water treatment agents. Background technique [0002] With the downhole production process of oil and gas fields and CO 2 With the development of flooding technology, there is often a certain pressure of CO in production wells. 2 gas, CO 2 Easily dissolved in formation water to form corrosive media such as carbonic acid. However, in the actual production of oil and gas fields, carbon steel with high strength and low price is tended to be used as casing and gathering pipeline material. Corrosive media such as carbonic acid will cause serious electrochemical corrosion to carbon steel, and even cause partial perforation of the pipeline and cause major production accidents. [0003] The fouling problem of oil and gas gathering and transportation system is a serious pr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F220/06C08F226/02C08F2/10C08F2/06C02F5/12C23F11/173C02F103/10
CPCC02F5/12C02F2103/10C02F2303/22C08F2/06C08F2/10C08F220/06C23F11/173C08F226/02
Inventor 戚建晶周佩何淼董俊苑慧莹姜毅李慧刘爱华
Owner PETROCHINA CO LTD
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