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Ternary polymer oil-displacing agent, and its preparing method and use

A technology of ternary polymer and oil-displacing agent, applied in drilling equipment and other directions, can solve the problems of technology and performance that do not involve salt resistance and temperature resistance, increase the viscosity of acrylamide polymer solution, and do not involve maintaining viscosity, etc. Achieve good initiation efficiency, improve temperature and salt resistance, and increase viscosity

Active Publication Date: 2005-05-04
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method produces a thickening effect through a crosslinking reaction, and does not involve the technology and performance of salt resistance and temperature resistance
[0006] CN1074019C discloses a kind of preparation method of polymer oil displacement agent, it is characterized in that polymer oil displacement agent is prepared by molecular compounding between two or more macromolecular chains with complementary structures, this method requires to prepare multiple acrylamides respectively Polymer, and then make it compound preparation, its purpose is also to increase the viscosity of acrylamide polymer solution, does not relate to the technology that maintains viscosity under the condition of high temperature and high salinity oil layer
[0009] To sum up, the oil displacement agents in the prior art have the problems of insufficient temperature resistance and salt resistance. Therefore, it is necessary to propose a polymer oil displacement agent with temperature resistance and salt resistance in view of the deficiencies in the prior art.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] The preparation of embodiment 1 sodium methacrylate

[0044] Weigh 120g of sodium sulfite, dissolve it in 480ml of deionized water, adjust the pH value to 10.5 with sodium hydroxide or dilute hydrochloric acid after dissolving, filter after standing for 26 hours, add the filtrate to the four-port reaction equipped with agitator, thermometer, and reflux condenser In the bottle, use sodium hydroxide or dilute hydrochloric acid to adjust the pH value to 9.6, weigh 93g of methyl chloride propene into the reaction bottle, heat up to 66.5°C, and react for 3 hours, then concentrate the reaction solution under reduced pressure, and remove the liquid 186ml, carry out hot filtration, remove reaction by-product, after the filtrate is cooled, mix and stir with 600ml saturated solution of sodium methacrylate, then crystallize, filter, dry, obtain sodium methacrylate product.

Embodiment 2

[0046] 71g of acrylamide, 0.71g of sodium methacrylsulfonate obtained in Example 1, and 2.07g of N,N-dimethylacrylamide were dissolved in 143g of deionized water. In the four-neck polymerization bottle of the device.

[0047] Use NaOH or dilute hydrochloric acid to adjust the pH value of the solution to 7-9, then add 0.175g of sodium edetate and stir evenly, adjust the initial temperature to 45°C, blow nitrogen for 30 minutes, add 4% potassium persulfate and 0.6% Sodium sulfite aqueous solution 5g. After 10 minutes, 0.02 g of DMAEMA was added, and the polymerization and hydrolysis reaction was carried out for 4 hours. The material was discharged, cut, vacuum-dried at 50° C. and crushed to obtain a white powdery solid. The degree of hydrolysis of the product is 15%, and the weight content of sulfonic acid groups is 0.85%. A polymer solution with a concentration of 1000ppm was prepared with deionized water, and its Brookfield viscosity at 25°C was measured. The data are listed...

Embodiment 3

[0049] Dissolve 71g of acrylamide, 0.71g of sodium methacrylsulfonate, and 2.07g of N,N-dimethylacrylamide in 143g of deionized water, and add it to a four-neck polymerization system equipped with a thermometer, stirrer, nitrogen conduit and reflux condenser. in the bottle.

[0050] Use NaOH or dilute hydrochloric acid to adjust the pH value of the solution to 6-7, then add 0.175g of sodium edetate and stir evenly, adjust the initial temperature to 35°C, blow nitrogen for 30 minutes, add 4% potassium persulfate and 0.6% Sodium sulfite aqueous solution 5g. After 10 minutes, 0.02 g of DMAEMA was added, and the polymerization and hydrolysis reaction was carried out for 4 hours. The material was discharged, cut, vacuum-dried at 50° C. and crushed to obtain a white powdery solid. The degree of hydrolysis of the product is 5%, and the weight content of sulfonic acid groups is 0.88%. A polymer solution with a concentration of 1000ppm was prepared with deionized water, and its Brook...

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Abstract

The invention relates to a kind of ternary polymer oil displacement agent and its manufacturing method and usage. The polymer is produced by polymerizing the three constituents of a) 60-99.96% (weight) acrylamide, b) 0.006-25% (weight) methyl propylene sodium sulfonate, c) 0.01-15% (weight) N, N-dimethyl acrylamide, in which the weight percent is calculated by gross amount of the added monomer. The weigh content of sulfonation radical in the polymer is 0.5-22.7%; the constituent b), methyl propylene sodium sulfonate, is acquired by reaction of methyl allyl-chloride and sodium sulfite, with PH controlled in 8.5-10.0. The ternary polymer oil displacement agent in the invention can improve heat-resistance and salt-proof properties of oil displacement agent efficiently in oil recovery process, so it has extensive economic benefit.

Description

technical field [0001] The invention relates to a water-soluble polymer material, in particular to a ternary polymer oil displacement agent and its preparation method and application. Background technique [0002] Polymer flooding is a large category of chemical flooding. In the tertiary oil recovery technology, the use of polymer flooding can greatly improve oil recovery and obtain significant economic and social benefits. [0003] At present, the most widely used polymer oil displacement agent is a synthetic polymer oil displacement agent based on polyacrylamide, such as partially hydrolyzed polyacrylamide, polyacrylic acid sodium salt, etc. This oil displacement agent is composed of acrylamide Polymerization has strong viscosity-increasing ability, but there are problems of temperature resistance and salt resistance. Under the reservoir conditions, the structure and performance are unstable, and the viscosity of the aqueous solution decreases significantly with the increa...

Claims

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Application Information

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Inventor 顾民李伟吕静兰韩淑兰
Owner CHINA PETROLEUM & CHEM CORP
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