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Oil-displacing agent composition for high-temperature reservoir enhanced recovery and preparation method thereof

A composition and oil-displacing agent technology, which are applied in the field of oil-displacing agent compositions and their preparation, can solve the problems of poor temperature and salt resistance and thermal stability, high displacement efficiency, low displacement efficiency, and the like, and achieve molecular weight High, stable polymerization reaction, and the effect of improving solubility

Active Publication Date: 2017-04-12
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] One of the technical problems to be solved by the present invention is that the polymer-containing oil displacement agent in the prior art has the problems of poor temperature resistance and salt resistance, poor heat resistance stability, and low displacement efficiency. High-yield oil-displacing agent composition and its preparation method. The method uses the composition containing acrylamide-based polymer for high-temperature-resistant oil-displacement in oil-displacement. It has the advantages of less investment and high displacement efficiency under high-temperature and high-salt conditions. high feature

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Dissolve 208g of acrylamide in 580g of deionized water, add 0.35g of disodium ethylenediaminetetraacetate, stir and dissolve evenly, adjust the pH value to 8.6 with 2% mass concentration of sodium hydroxide aqueous solution and 2% mass concentration of hydrochloric acid solution , adjust the temperature of the constant temperature water bath to 10°C, introduce high-purity nitrogen to remove oxygen, and after 40 minutes, add 31g of 0.3% mass concentration of urea aqueous solution and 0.2% mass concentration of N,N-dimethylaminoethyl methacrylate aqueous solution 25g , 0.25% mass concentration of N,N-dimethyl-1,3-propanediamine aqueous solution 8g, 0.15% mass concentration of potassium persulfate aqueous solution 14g, 0.15% mass concentration of azobisisobutyronitrile solution 18g, stirring And initiate the polymerization reaction, after half an hour, raise the temperature of the water bath to 19°C, react for 3 hours, raise the temperature of the water bath to 36°C, contin...

Embodiment 2

[0028] Dissolve 174g of acrylamide and 35g of 2-acrylamido-2-methylpropanesulfonic acid in 618g of deionized water, add 0.55g of disodium edetate and 7.0g of sodium hydroxide, stir and dissolve evenly, and use 2 % mass concentration of sodium hydroxide aqueous solution and 2% mass concentration of hydrochloric acid solution to adjust the pH value to 8.3, adjust the temperature of the constant temperature water bath to 10 ° C, introduce high-purity nitrogen to remove oxygen, and after 40 minutes, add 0.3% mass concentration of urea aqueous solution in sequence 22g, 0.2% mass concentration of N,N-dimethylaminoethyl methacrylate aqueous solution 15g, 0.15% mass concentration of ammonium persulfate aqueous solution 15g, 0.15% mass concentration of azobisisobutylamidine hydrochloride 8g, Stir and initiate the polymerization reaction. After half an hour, raise the temperature of the water bath to 22°C, react for 3 hours, raise the temperature of the water bath to 40°C, and continue t...

Embodiment 3

[0033] Dissolve 174g of acrylamide and 22g of N-phenylmaleimide in 600g of deionized water, add 0.52g of disodium ethylenediaminetetraacetate, stir and dissolve evenly, then use 2% mass concentration of sodium hydroxide aqueous solution and 2% mass concentration of hydrochloric acid solution to adjust the pH value to 7.6, adjust the temperature of the constant temperature water bath to 10 ° C, introduce high-purity nitrogen gas to remove oxygen, and after 40 minutes, add 0.3% mass concentration of urea aqueous solution 23g, 0.2% mass concentration of methyl Acrylic acid N,N-dimethylaminoethyl ester aqueous solution 18g, ammonium persulfate aqueous solution 23g of 0.15% mass concentration, azobisisobutylamidine hydrochloride 14g of 0.15% mass concentration, stir and initiate polymerization reaction, after half an hour Raise the temperature of the water bath to 23°C, react for 3 hours, raise the temperature of the water bath to 46°C, and continue the reaction for 6 hours to obtai...

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Abstract

The invention relates to an oil-displacing agent composition for improving a recovery ratio of a high-temperature reservoir and a preparation method of the composition, mainly solving the problems that a polymer-containing oil-displacing agent in the prior art is poor in temperature resistance, salt resistance and thermal stability resistance, and low in displacement efficiency. In order to solve the problems better, a following technical scheme is adopted as follows: the oil-displacing agent composition comprises the following components in percentage by weight: 0.005%-8.0% of high-temperature-resistant and oil-displacing acrylamide polymers, 0.005%-5.0% of a fatty alcohol polyoxyethylene ether carboxylate surfactant and 87.0%-99.99% of injected water. The preparation method of the oil-displacing agent composition comprises the following steps: regulating a pH value; ventilating a nitrogen gas and removing an oxygen gas; carrying out hydrolysis reaction; drying, crushing and sieving to obtain acrylamide polymers; stirring the acrylamide polymers, the fatty alcohol polyoxyethylene ether carboxylate and the injected water for 0.5 hour-5 hours at 5 DEG C-45 DEG C, and uniformly mixing to obtain the oil-displacing agent composition. And therefore, the oil-displacing agent composition can be used for tertiary oil recovery production of the high-temperature reservoir.

Description

technical field [0001] The invention relates to an oil displacement agent composition for enhancing the recovery rate of high-temperature oil reservoirs and a preparation method thereof. Background technique [0002] Acrylamide polymer is a kind of multifunctional water-soluble polymer obtained by homopolymerization or copolymerization of acrylamide. Its main chain has a large number of active side groups (amide groups) and / or other groups (such as hydroxyl groups, sulfonic acid groups or N-substituent groups, etc.), which endow the polymer with many excellent properties, such as flocculation, viscosity increase properties, cohesiveness, surface activity, temperature resistance, shear resistance and thermal stability, etc., so it is widely used in drilling, oil production, water shutoff, profile control, acidizing, fracturing, water treatment and other fields. [0003] In the field of oil recovery, due to the primary and secondary oil recovery in major domestic oil fields, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/588C09K8/584C08F20/56C08F4/40
CPCC08F4/40C08F20/56C09K8/584C09K8/588
Inventor 于志省夏燕敏蔡红宋晓芳许汇朱益兴王兰
Owner CHINA PETROLEUM & CHEM CORP
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