A small molecule oil displacement agent with high viscosity increasing and high shear resistance and its preparation method

A technology of small molecules and oil displacing agents, applied in the field of small molecule oil displacing agents and its preparation, can solve problems such as poor shear resistance, achieve high shear resistance, strong fluidity control ability, and high production efficiency

Active Publication Date: 2019-01-29
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The present invention aims at the disadvantage of poor shear resistance of existing large molecular weight oil displacement polymers, and provides a small molecule oil displacement agent with high viscosity increasing and high shear resistance and its preparation method

Method used

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  • A small molecule oil displacement agent with high viscosity increasing and high shear resistance and its preparation method
  • A small molecule oil displacement agent with high viscosity increasing and high shear resistance and its preparation method
  • A small molecule oil displacement agent with high viscosity increasing and high shear resistance and its preparation method

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Raw materials: CTAB (cetyltrimethylammonium bromide), 4-hydroxysalicylic acid, anhydrous sodium carbonate, water with a salinity of 100±10mg / L.

[0032] Preparation steps:

[0033] (1) Weigh 0.375g of CTAB and add it to 49.5g of water with a mineralization degree of 100±10mg / L, raise the water temperature to 40±2°C, stir evenly, add 0.125g of 4-hydroxysalicylic acid, and stir evenly again , and adding anhydrous sodium carbonate to adjust the pH of the solution to be 4.10;

[0034] (2) Transfer the above mixture into a three-necked flask, heat with an oil bath while stirring, and keep the temperature at 68±2°C for 1 hour.

[0035] (3) After 1 hour, the viscosity increased, and the stirring was stopped, and the solution was poured out from the flask to cool, and finally a small molecule oil displacing agent CT-4QS with high viscosity was formed.

Embodiment 2

[0037] Raw materials: CTAB (cetyltrimethylammonium bromide), 2-naphthoic acid, anhydrous sodium carbonate, water with a salinity of 5380±50mg / L.

[0038] (1) Weigh 0.46g of CTAB and add it to 49.4g of water with a salinity of 5380±50mg / L, raise the water temperature to 45±2°C, stir evenly, add 0.14g of 2-naphthoic acid, stir evenly again, And adding anhydrous sodium carbonate to adjust the pH value of the solution to 6.5.

[0039] (2) Transfer the above mixture into a three-neck flask, heat with an oil bath while stirring, and keep the temperature at 63±2°C for 1.5 hours.

[0040] (3) After 1.5 hours, the viscosity increased, and the stirring was stopped, and the solution was poured out from the flask to cool, and a small-molecule oil-displacing agent CT-2NJ with high viscosity was finally formed.

Embodiment 3

[0042] Raw materials: CTAB (cetyltrimethylammonium bromide), 3,7-dihydroxy-2-naphthoic acid, anhydrous sodium carbonate, water with a salinity of 7950±50mg / L.

[0043] (1) Weigh 0.55g of CTAB and add it to 49.3g of water with a mineralization degree of 7950±50mg / L, raise the water temperature to 48±2°C, stir well, then add 0.15g of 3,7-dihydroxy-2-naphthalene Formic acid, stir again, and add sodium carbonate to adjust the pH value of the solution to 6.9.

[0044] (2) Transfer the above mixture into a three-necked flask, heat with an oil bath while stirring, and keep the temperature at 65±2°C for 2 hours.

[0045] (3) After reacting for 2 hours, the viscosity rises, stop stirring, and pour the solution out of the flask to cool, and finally form a small molecule oil displacing agent CT-3Q2NJ with high viscosity.

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Abstract

The invention discloses a micromolecule oil displacement agent with high viscosity increasing performance and high shearing resistance and a preparation method thereof and relates to the field of tertiary oil recovery. The micromolecule oil displacement agent comprises, by weight, 0.5-0.8% of a main agent CTAB, 0.2-0.3% of a micromolecule adjustment adjuvant, 0.1-0.2% of sodium carbonate and 98.7-99.2% of water. The preparation method comprises adding the main agent CTAB into water, heating the solution to a temperature of 40-50 DEG C along with stirring so that the CTAB is completely dissolved in water, adding the micromolecule adjustment adjuvant into the water obtained by the step 1, adjusting solution pH to 4-7 through anhydrous sodium carbonate, transferring the mixed solution into a special container, heating the mixed solution to a temperature of 60-70 DEG C and carrying out a reaction process for 1-2h so that the micromolecule oil displacement agent with high viscosity increasing performance and high shearing resistance is obtained. The micromolecule oil displacement agent has good viscosity increasing performance, high shearing resistance, high production efficiency and small energy consumption, can be used for oil reservoirs in different areas, effectively solves the problem of viscosity reduction of the oil displacement agent going through a near wellbore and greatly improves oil reservoir recovery efficiency.

Description

technical field [0001] The invention relates to the field of tertiary oil recovery, in particular to a small molecule oil displacement agent with high viscosity increasing and high shear resistance and a preparation method. Background technique [0002] In recent years, polymer flooding technology has been widely used in domestic oilfields, and not only has remarkable progress been made, but also the technical level is becoming more and more mature. However, as the reservoir conditions become more and more severe, the performance of the existing oil displacement polymer partially hydrolyzed polyacrylamide has been unable to meet the needs of further enhanced oil recovery, especially the current partially hydrolyzed polyacrylamide due to its relatively low molecular weight High, although the viscosity is high when it is prepared on the ground, it will be subject to strong shearing when it is prepared, diluted and passed through the formation blasthole. After the above shearin...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/58C09K8/584
Inventor 程玉桥徐辉杨勇韩玉贵曹绪龙李振泉宋新旺郭兰磊李彬孙秀芝李海涛张文窦立霞庞雪君何冬月张新英
Owner CHINA PETROLEUM & CHEM CORP
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