Multi-functional efficient oil scavenge polymer and preparation method of raw material graft modification starch thereof

A technology of oil displacement polymer and graft modification, which is applied in the direction of drilling compositions, chemical instruments and methods, and can solve the problem of low viscosity retention rate, low water absorption of monomer graft modified starch, and reduced interface Tension and other issues, to achieve good biodegradability, excellent interface activity, and increase production

Active Publication Date: 2013-02-20
大庆高新区华龙祥化工有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

During the oil displacement process of water flooding and polymer flooding, most of the injected water and polymer solutions enter the high-permeability layer, and the low-permeability layer has low sweep, and the polymer solution is easily affected by temperature, shear, bacteria, etc. The viscosity retention rate is very low, which seriously affects the oil displacement effect of water flooding and polymer flooding; on the other hand, the polymer solution does not have the ability to greatly reduce the interfacial tension with the formation crude oil, and the oil washing efficiency is poor; secondly, the polymer solution Does not have emulsification ability with crude oil, resulting in reduced recovery of polymer flooding
[0004] The water absorption rate of monomer graft modified starch prepared according to the existing method is not high and still needs to be improved

Method used

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  • Multi-functional efficient oil scavenge polymer and preparation method of raw material graft modification starch thereof
  • Multi-functional efficient oil scavenge polymer and preparation method of raw material graft modification starch thereof
  • Multi-functional efficient oil scavenge polymer and preparation method of raw material graft modification starch thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] a. Weigh 50g of water and put it into a four-necked flask, add 25g of acrylonitrile starch, when the temperature rises to 55°C, stir to dissolve the starch, add 3.5g of potassium chloride, 5g of 20% sodium hydroxide solution, stir evenly, and use drops Slowly drop 35g of dodecane chloride into the liquid funnel, raise the temperature to 80°C, finish the reaction after 6 hours of reaction, and generate an intermediate for use.

[0021] b. Weigh 50g of intermediate 1 into a polymerization reaction vessel, add 35g of deionized water, stir evenly, heat up to 80°C, pass nitrogen gas for 30 minutes, cool down to 50°C, add 0.02g of initiator cerium ammonium nitrate, stir After 10 minutes, 10 g of acrylic acid was added, and after reacting for 3 hours, the crude product was extracted with ethanol to obtain monomer grafted modified starch.

Embodiment 2

[0023] a. Weigh 60g of water and put it into a four-necked flask, add 30g of acrylonitrile starch, when the temperature rises to 50°C, stir to dissolve the starch, add 3g of 20% sodium hydroxide solution, stir evenly, slowly dissolve 30g of acrylonitrile starch with a dropping funnel Chlorododecane was added dropwise, and the temperature was raised to 85°C. After 6 hours of reaction, the reaction was terminated, and an intermediate was generated for use.

[0024] b. Weigh 35g of intermediate 1 into a polymerization reaction vessel, add 35g of deionized water, stir evenly, heat up to 80°C, pass nitrogen gas for 30 minutes, cool down to 50°C, add 0.03g of initiator cerium ammonium nitrate, stir After 10 minutes, 20 g of acrylic acid was added, and after reacting for 3 hours, the crude product was extracted with ethanol to obtain monomer grafted modified starch.

Embodiment 3

[0026] a. Weigh 70g of water and put it into a four-neck flask, add 35g of acrylonitrile starch, when the temperature rises to 60°C, stir to dissolve the starch, add 2.5g of potassium chloride, 4g of 20% sodium hydroxide solution, stir evenly, and use drops Slowly drop 25g of dodecane chloride into the liquid funnel, raise the temperature to 90°C, finish the reaction after 6 hours of reaction, and generate an intermediate for use.

[0027] b. Weigh 40g of intermediate 1 into a polymerization reaction vessel, add 35g of deionized water, stir evenly, heat up to 80°C, pass nitrogen gas for 30 minutes, cool down to 50°C, add 0.035g of initiator cerium ammonium nitrate, and stir After 10 minutes, 25 g of acrylic acid was added, and after reacting for 3 hours, the crude product was extracted with ethanol to obtain monomer grafted modified starch.

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Abstract

The invention provides multi-functional efficient oil scavenge polymer which is characterized by being a copolymer formed by copolymerizing monomer acrylamide, crylic acid or 2-acrylamide-2 methyl-1-propanesulfonic acid and monomer graft modification starch. Content of acrylamide and crylic acid or 2-acrylamide-2 methyl-1-propanesulfonic acid occupies, by mass, 60-90% of total mass of two monomers, and the two monomers occupy 30-60% of total mass. Alkyl halide is added in the process of preparation of the monomer graft modification starch. Productivity of the multi-functional efficient oil scavenge polymer reaches more than 90%, is efficient, environment-friendly and high in interfacial activity, enables oil-water interface tension of oil reservoir crude oil to arrive at 10-2-10-3Mn / m, and is free of dehydration after 24-hour emulsification, rapid in demulsification, high in temperature resistance and shear resistance, non-toxic, environment-friendly and good in biodegradability. Alkyl halide is added in the process so as to enable water absorption rate of the prepared monomer graft modification starch to be higher.

Description

technical field [0001] The invention relates to an oilfield chemical polymer, in particular to a multifunctional high-efficiency oil displacement polymer and a preparation method of grafted modified starch as a raw material thereof. Background technique [0002] At present, the water cut in my country's oilfields is generally above 80%, and some even reach above 90%. The recovery degree of recoverable reserves is generally above 60%, and some even reach 70%-80%. Under the condition of high water cut and high degree of recovery, the distribution of oil and water in the reservoir is very complicated, and the remaining oil is highly dispersed in space, which greatly increases the difficulty of production. Due to the severe heterogeneity of continental sediments in my country, the coefficient of variation of permeability is generally greater than 0.5, which is not conducive to water flooding but beneficial to polymer flooding. Furthermore, the viscosity of crude oil in the eas...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F251/00C08F220/56C08F220/06C08F220/58C08B31/12C09K8/588
Inventor 孙安顺
Owner 大庆高新区华龙祥化工有限公司
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