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Method for preparing high-temperature-resistant and salt-resistant retarders for oil well cement

A technology of oil well cement and high temperature resistance, applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve the problems of poor salt resistance, reduce hydrate formation, reduce hydration speed, etc., and achieve non-degradable, salt-resistant The effect of superior performance and broad application prospects

Inactive Publication Date: 2017-06-09
戴琪
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention: Aiming at the problem that the traditional oil well cement retarder is easy to degrade under high temperature conditions, the retarding effect is reduced and the salt resistance is poor, a modified vinylphosphonic acid is provided. Add phosphonic acid group and carboxyl group to polymaleic acid to prevent the formation of hydrates, and then use 2-acrylamide-2-methylpropanesulfonic acid as raw material to condense the polymer to contain a variety of active groups , can be adsorbed on the surface of hydrates to reduce the hydration rate, and then cooperate with additives to prepare the method of high temperature resistant and salt resistant oil well cement retarder. The present invention first uses maleic acid as raw material, and mixes hydrogen peroxide and sodium hypophosphite After polymerization under the action, vinylphosphonic acid is grafted, and then hydrolyzed under alkaline conditions to obtain hydrolytically modified polymaleic acid, which contains two adjacent carboxyl groups and phosphine Acid groups can enhance the chelation of calcium and reduce the formation of hydrates, and then react with 2-acrylamide-2-methylpropanesulfonic acid to introduce more active groups, which can be adsorbed on the surface of hydrates and inhibit the formation of hydrates. Contact with water, and can form an impermeable layer around cement particles, slow down hydration, increase high temperature stability and salt resistance, and finally mix with sodium humate and heat

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0017] First weigh 25g of maleic acid and add it to a three-necked flask filled with 120mL of water, place the flask in an oil bath, control the temperature at 80°C, stir and dissolve for 30min to obtain a maleic acid solution, and pour it into the maleic acid Add 50mL of 30% hydrogen peroxide and 0.5g of sodium hypophosphite to the olefinic acid solution, heat up to 90°C, stir for 3 hours, then add 12g of vinylphosphonic acid, heat up to 105°C, and continue to stir for 2h. After the reaction is over, collect the product; place the above product in a rotary evaporator, and evaporate it to 1 / 3 of the original volume of the product to obtain a concentrated solution. Take 20 g of the concentrated solution and add it to a container containing 200 mL of 15% sodium hydroxide solution in a beaker, put the beaker in a water bath, control the temperature at 70°C, stir and hydrolyze for 2 hours, stop heating, collect the hydrolyzate, leave the hydrolyzate to separate layers, collect the ...

example 2

[0020]First weigh 20g of maleic acid and add it to a three-necked flask filled with 100mL of water, place the flask in an oil bath, control the temperature at 70°C, stir and dissolve for 20min to obtain a maleic acid solution, and pour it into the maleic acid Add 40mL of 30% hydrogen peroxide and 0.3g of sodium hypophosphite to the olefinic acid solution, heat up to 85°C, stir for 2 hours, then add 8g of vinylphosphonic acid, heat up to 95°C, and continue to stir for 1h. After the reaction is finished, collect the product; place the above product in a rotary evaporator, and evaporate it to 1 / 3 of the original volume of the product to obtain a concentrated solution. Take 15 g of the concentrated solution and add it to a container containing 100 mL of 15% sodium hydroxide solution in a beaker, place the beaker in a water bath, control the temperature at 60°C, stir and hydrolyze for 1 hour, stop heating, collect the hydrolyzate, leave the hydrolyzate to separate layers, collect th...

example 3

[0023] First weigh 23g of maleic acid and add it to a three-necked flask filled with 110mL of water, place the flask in an oil bath, control the temperature at 75°C, stir and dissolve for 25min to obtain a maleic acid solution, and pour it into the maleic acid Add 45mL of 30% hydrogen peroxide and 0.4g of sodium hypophosphite to the olefinic acid solution, heat up to 87°C, stir for 2 hours, then add 10g of vinylphosphonic acid, heat up to 100°C, and continue to stir for 1h. After the reaction is over, collect the product; place the above product in a rotary evaporator, and evaporate it to 1 / 3 of the original volume of the product to obtain a concentrated solution. Take 18 g of the concentrated solution and add it to a container containing 150 mL of 15% sodium hydroxide solution in a beaker, put the beaker in a water bath, control the temperature at 65°C, stir and hydrolyze for 2 hours, stop heating, collect the hydrolyzate, put the hydrolyzate into layers, collect the lower org...

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Abstract

The invention relates to a method for preparing high-temperature-resistant and salt-resistant retarders for oil well cement, and belongs to the field of technologies for preparing retarders. The method includes polymerizing maleic acid which is used as a raw material, and then grafting vinyl phosphonic acid on the maleic acid; hydrolyzing the maleic acid under alkaline conditions to obtain hydrolyzed and modified poly-maleic acid; carrying out reaction on 2-acrylamide-2-methylpropanesulfonic acid and the hydrolyzed and modified poly-maleic acid to obtain reaction products; mixing the reaction products, sodium humate and the like with one another to obtain mixtures and heating the mixtures. The hydrolyzed and modified poly-maleic acid contains a carboxyl group and a phosphonic acid group which are adjacent to each other, accordingly, calcium chelation can be enhanced, and hydrate formation can be reduced. Large quantities of active groups can be led into the reaction products and can be adsorbed on the surfaces of hydrate, accordingly, water contact can be inhibited, impervious layers can be formed around cement particles, hydration effects can be retarded, and the high-temperature stability and the salt resistance can be improved. The method has the advantages that the high-temperature-resistant and salt-resistant retarders for the oil well cement are excellent in high-temperature-resistant property and salt-resistant property and are difficult to degrade under high-temperature conditions, accordingly, influence on the comprehensive properties of cement slurry can be prevented, and the method has a broad application prospect.

Description

technical field [0001] The invention relates to a preparation method of a high-temperature-resistant and salt-resistant oil well cement retarder, and belongs to the technical field of retarder preparation. Background technique [0002] With the improvement of drilling technology and the increasing difficulty of oilfield production, drilling is developing into deep wells, ultra-deep wells, and complex wells, and the temperature and pressure at the bottom of the well have increased significantly. The direct manifestation is that under high temperature and high pressure, the oil well cement slurry thickens rapidly during the cementing process. , can not meet the requirements of cementing construction. When it is serious, it will lead to the occurrence of "whole pump" accident, which will bring huge property losses to the oil field. In addition, under high temperature and high pressure, the physical and chemical properties of cement slurry will change significantly, affecting t...

Claims

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Application Information

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IPC IPC(8): C09K8/467C08F267/04C08F220/58C04B103/22
CPCC04B2103/22C08F267/04C09K8/467C08F220/585
Inventor 戴琪薛洋王维
Owner 戴琪
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