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Nanoscale polymer microsphere for profile control and flooding and preparation method thereof

A polymer, nano-scale technology, applied in drilling compositions, chemical instruments and methods, etc., can solve the problems of lack of compressibility, poor access, inability to deep profile control, etc., and achieve long water absorption cycle and small particle size. , the effect of enhancing oil recovery

Inactive Publication Date: 2021-06-11
DALIAN TRICO CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it does not have compressibility, poor penetration, and cannot be used for deep profile control, resulting in a small radius of profile control and easy to pollute formations near wellbore

Method used

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  • Nanoscale polymer microsphere for profile control and flooding and preparation method thereof
  • Nanoscale polymer microsphere for profile control and flooding and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Weigh 1000g of white oil, 225g of Span 80, and 75g of tween-80 and add them into a 2L four-neck flask, stir evenly to obtain the oil phase;

[0024] Weigh 300g of deionized water and add it to a 1L beaker, then add 380g of acrylamide monomer, 40g of sodium acrylate, and 6g of N,N-methylenebisacrylamide in sequence, stir until the solution is clear, and then add 10g of 25% persulfuric acid The ammonium aqueous solution was stirred evenly, poured into a four-necked flask, stirred evenly, and nitrogen was passed through to exhaust oxygen for 30 minutes, so that the oxygen content in the four-necked flask was below 0.3%;

[0025] Put the four-neck flask into an ice bath, the initial temperature is 20°C, slowly add 10g of 25% sodium sulfite aqueous solution to initiate the reaction, and reach 90°C after 15 minutes, at this time, the reaction temperature will no longer rise, the reaction is ended, and the temperature is lowered to room temperature. Sampling analysis showed th...

Embodiment 2

[0027] Weigh 1000g of white oil, 300g of Span 80 and 100g of tween-80 and add them into a 2L four-neck flask, stir evenly to obtain the oil phase;

[0028] Weigh 410g of deionized water and add it to a 1L beaker, then add 480g of acrylamide monomer, 30g of sodium 2-acrylamide-2-methylpropanesulfonate, and 10g of N,N-methylenebisacrylamide in sequence, and stir until After the solution is clarified, then add 20g of 25% ammonium persulfate aqueous solution, stir evenly, pour it into a four-necked flask, stir evenly, pass nitrogen to exhaust oxygen for 30 minutes, so that the oxygen content in the four-necked flask is below 0.3%;

[0029] Put the four-neck flask in an ice bath, the initial temperature is 20°C, slowly add 15g of 25% sodium sulfite aqueous solution to initiate the reaction, and reach 90°C after 10 minutes, at this time, the reaction temperature will no longer rise, the reaction is ended, and the temperature is lowered to room temperature. Sampling and analysis show...

Embodiment 3

[0031] Weigh 1000g of white oil, 300g of Span 80, and 150g of TX-10 and add them into a 2L four-neck flask, stir evenly to obtain the oil phase;

[0032] Weigh 300g of deionized water and add it to a 1L beaker, then add 430g of acrylamide monomer, 45g of sodium 2-acrylamide-2-methylpropanesulfonate, and 15g of N,N-methylenebisacrylamide in sequence, and stir until After the solution is clarified, then add 20g of 25% ammonium persulfate aqueous solution, stir evenly, pour it into a four-necked flask, stir evenly, pass nitrogen to exhaust oxygen for 30 minutes, so that the oxygen content in the four-necked flask is below 0.3%;

[0033] Put the four-necked flask into an ice bath, the initial temperature is 20°C, slowly add 25g of 25% sodium sulfite aqueous solution to initiate the reaction, and reach 90°C after 10 minutes, at this time, the reaction temperature will no longer rise, the reaction is ended, and the temperature is lowered to room temperature. Sampling and analysis sh...

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Abstract

The invention relates to a nanoscale polymer microsphere for profile control and flooding and a preparation method thereof, and belongs to the technical field of tertiary oil recovery. A mixed emulsifier used in the preparation method comprises a component a and a component b, wherein the component a is Span 80, and the component B isbtween-80 or TX-10; the mass ratio of the component a to the component b is 3:(1-2). The prepared product is small in initial particle size, can expand and become large by dozens of times after absorbing water, is long in water absorption period, does not form plugging in a short period when being injected into an oil well, elastically deforms when the plugging pressure difference rises to a certain degree; then the product continues to migrate to the deep part of an oil layer through a throat. The product is suitable for deep profile control and water plugging operation of tertiary oil recovery of an oil field, thereby improving the crude oil recovery ratio.

Description

technical field [0001] The invention relates to a nanoscale polymer microsphere for control and flooding and a preparation method thereof, belonging to the technical field of tertiary oil recovery. Background technique [0002] In the process of oil extraction, water injection development is the most economical and effective means to enhance oil recovery. However, with the continuous extraction of crude oil, the oil reservoirs gradually decrease, the viscosity increases, the efficiency of water flooding decreases significantly, and the water content of crude oil increases greatly, which undoubtedly promotes the innovation and development of profile control technology. Profile control technology can improve the water absorption profile, adjust the direction of water flow, and then increase the swept volume of water injection, improve the effect of water injection development, and achieve the purpose of increasing oil recovery. In the initial stage of the development of profi...

Claims

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Application Information

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IPC IPC(8): C08F220/56C08F220/02C08F222/38C08F220/58C09K8/588
CPCC08F220/56C09K8/588C09K2208/10
Inventor 徐国锋刘长波杨志勇赵国荣
Owner DALIAN TRICO CHEM
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