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Salt-resistant polymer for oil displacement and preparation method thereof

A polymer and oil displacement technology, applied in the direction of drilling compositions, chemical instruments and methods, etc., can solve the problems of reducing water solubility and molecular weight, poor viscosity increasing effect of polyacrylamide, and increasing salt resistance, etc., to achieve The effect of good solubility properties

Active Publication Date: 2020-11-06
黑龙江吉地油田服务股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The main problem of polyacrylamide is thermal degradation and temperature resistance. When the temperature is too high, polyacrylamide will undergo severe thermal degradation, so polyacrylamide is not suitable for use in high-temperature formations
In addition, with the field application of polymer flooding, it is necessary to reinject polymer flooding produced water, but the salinity of polymer flooding produced water is high, and the viscosifying effect of polyacrylamide in formation water with high salinity becomes weaker. Poor, so that the tertiary oil recovery has basically no economic benefits
[0003] In recent years, the research on the salt resistance of polyacrylamide through the copolymerization of acrylamide and salt-resistant monomer has been paid attention to, but this kind of polyacrylamide often has the characteristics of narrow molecular weight distribution, increasing salt resistance and reducing water solubility and molecular weight. Shortcomings, so the present invention provides a polymer with a wide molecular weight distribution, temperature resistance, salt resistance, anti-bacteria, and shear resistance, and can maintain good solubility and viscosity-increasing effect under oilfield sewage conditions

Method used

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  • Salt-resistant polymer for oil displacement and preparation method thereof
  • Salt-resistant polymer for oil displacement and preparation method thereof
  • Salt-resistant polymer for oil displacement and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] A salt-resistant polymer for oil displacement and a preparation method thereof:

[0038] (1) Mix 120 parts of acrylamide, 20 parts of acrylic acid, 10 parts of modified starch, 10 parts of type I Gemini surfactant (m=12, n=12, x=2, y=2), 5 parts of type V chain The growth agent and 320 parts of water are mixed and stirred evenly, and the pH is adjusted to 10.5 with 10% sodium hydroxide solution;

[0039] Wherein, the structure of type I Gemini surfactant is as follows, wherein m=12, n=12, x=2, y=2:

[0040]

[0041] The structure of type V chain extender is as follows:

[0042] (2) Add the solution prepared in step (1) into the adiabatic polymerization kettle, pass nitrogen gas to remove oxygen for 45 minutes, add 0.05 parts of azobisisobutyronitrile, add 0.02 parts of potassium persulfate after 10 minutes, and add 0.02 parts of sodium bisulfite, after the temperature of the system in the kettle was raised by 3°C, the nitrogen gas was stopped, and after the react...

Embodiment 2

[0048] A salt-resistant polymer for oil displacement and a preparation method thereof:

[0049] (1) Mix 120 parts of acrylamide, 20 parts of acrylic acid, 10 parts of modified starch, 5 parts of type IGemini surfactant (m=12, n=12, x=2, y=2), 5 parts of type II Gemini surfactant Agent (m=12, n=12, x=2, y=2), 8 parts of type V chain extender, 320 parts of water are mixed and stirred evenly, and the pH is adjusted to 10.5 with 10% sodium hydroxide solution;

[0050] Wherein, the structure of type I Gemini surfactant is as follows, wherein m=12, n=12, x=2, y=2:

[0051]

[0052] The structure of type II Gemini surfactant is as follows, wherein m=12, n=12, x=2, y=2

[0053]

[0054] The structure of type V chain extender is as follows:

[0055](2) Add the solution prepared in step (1) into the adiabatic polymerization kettle, pass nitrogen gas to remove oxygen for 45 minutes, add 0.05 parts of azobisisobutyronitrile, add 0.02 parts of potassium persulfate after 10 minute...

Embodiment 3

[0061] A salt-resistant polymer for oil displacement and a preparation method thereof:

[0062] (1) Mix 120 parts of acrylamide, 20 parts of acrylic acid, 10 parts of modified starch, 5 parts of type IGemini surfactant (m=18, n=18, x=1, y=1), 5 parts of type II Gemini surfactant Agent (m=12, n=12, x=2, y=2), 10 parts of type V chain extender, 320 parts of water are mixed and stirred evenly, and the pH is adjusted to 10.5 with 10% sodium hydroxide solution;

[0063] Wherein, the structure of type I Gemini surfactant is as follows, wherein m=18, n=18, x=1, y=1:

[0064]

[0065] The structure of type II Gemini surfactant is as follows, wherein m=12, n=12, x=2, y=2

[0066]

[0067] The structure of type V chain extender is as follows:

[0068] (2) Add the solution prepared in step (1) into the adiabatic polymerization kettle, pass nitrogen gas to remove oxygen for 45 minutes, add 0.05 parts of azobisisobutyronitrile, add 0.02 parts of potassium persulfate after 10 minu...

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Abstract

The invention discloses a salt-resistant polymer for oil displacement and a preparation method thereof, and relates to the technical field of petroleum exploitation. The salt-resistant polymer comprises acrylamide, acrylic acid, modified starch, a Gemini surfactant, a chain extender, an initiator and other components. Through polymerization of acrylamide, acrylic acid, modified starch and the chain extender, the salt-resistant polymer for oil displacement is prepared, and the salt-resistant polymer is resistant to high temperature and salt and wide in molecular weight distribution. Due to theaddition of the Gemini surfactant, the polymer has good water solubility, and has a better oil displacement effect when being used for high-temperature and high-salinity oil reservoirs.

Description

Technical field: [0001] The invention relates to the technical field of petroleum exploitation, in particular to a salt-resistant polymer for oil displacement, and in particular to a preparation method of the salt-resistant polymer for oil displacement. Background technique: [0002] Tertiary oil recovery technology has become one of the main measures to enhance oil recovery in China, and the polymer used in tertiary oil recovery is currently mainly polyacrylamide. The main problem of polyacrylamide is thermal degradation and temperature resistance. When the temperature is too high, polyacrylamide will undergo severe thermal degradation, so polyacrylamide is not suitable for use in high-temperature formations. In addition, with the field application of polymer flooding, it is necessary to reinject polymer flooding produced water, but the salinity of polymer flooding produced water is high, and the viscosifying effect of polyacrylamide in formation water with high salinity be...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F251/00C08F220/06C08F220/56C08F2/38C08B31/00C09K8/588
CPCC08F251/00C08F2/38C09K8/588C08B31/00C08F220/06C08F220/56
Inventor 孙安顺
Owner 黑龙江吉地油田服务股份有限公司
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