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PH-responsive modified polyacrylamide oil displacement agent and preparation method thereof

A technology of polyacrylamide oil displacement agent and acrylamide, which is applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve the problems of immature experimental methods, lack of application and practice, and poor stability, so as to improve crude oil recovery Yield, Enhanced Crude Oil Recovery, Ease of Separation

Active Publication Date: 2018-02-02
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Microemulsion flooding oil displacement agents are still in the initial development stage, and the experimental methods are not mature enough
Foam flooding oil displacement agent is the least stable of these types of surfactants. Scholars have developed new and stable foams, but there is a lack of practical application and practice.

Method used

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  • PH-responsive modified polyacrylamide oil displacement agent and preparation method thereof
  • PH-responsive modified polyacrylamide oil displacement agent and preparation method thereof
  • PH-responsive modified polyacrylamide oil displacement agent and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] This embodiment provides a pH-responsive modified polyacrylamide oil displacement agent, which is prepared according to the following steps:

[0036] The percentages of various comonomers used in the pH-responsive modified polyacrylamide oil displacement agent in the total mass are: 68% of acrylamide, 15% of sodium acrylate; 12% of the functional monomer shown in formula III, and 12% of the functional monomer shown in formula IV 5% of functional monomers indicated.

[0037]

[0038] The specific preparation method of the functional monomer in formula III is as follows: 2mmol ethanolamine and 2mmol potassium naphthalene are added to tetrahydrofuran, and they are completely dissolved at room temperature to obtain an alcoholate initiator; 30mmol pure dry DEA monomer is quickly added to the mixed solution , after reacting at room temperature for 5 hours, the product was repeatedly precipitated and purified with cold n-hexane, and set aside; 60 mL of dichloromethane and 1...

Embodiment 2

[0042] This embodiment provides a pH-responsive modified polyacrylamide oil displacement agent, which is prepared through the following steps:

[0043] The percentages of various comonomers used in the pH-responsive modified polyacrylamide oil displacement agent in the total mass are: 65% of acrylamide, 15% of sodium acrylate, 10% of the functional monomer shown in formula V, and 10% of the functional monomer shown in formula VI. 10% of the indicated functional monomers.

[0044]

[0045] The specific preparation method of the functional monomer in formula V is as follows: 4 mmol ethanolamine and 4 mmol potassium naphthalene are added to tetrahydrofuran, and they are completely dissolved at room temperature for several minutes to obtain an alcoholate initiator; 60 mmol of pure dry DEA monomer is quickly added to the mixture In the solution, after reacting at room temperature for 5 hours, the product was repeatedly precipitated and purified with cold n-hexane for subsequent ...

Embodiment 3

[0049] This embodiment provides a pH-responsive modified polyacrylamide oil displacement agent, which is prepared through the following steps:

[0050] The percentages of various comonomers used in the pH-responsive modified polyacrylamide oil displacement agent in the total mass are: 55% of acrylamide, 15% of acrylic acid, 20% of the functional monomer shown in formula VII, and 20% of the functional monomer shown in formula VIII 10% of functional monomers.

[0051]

[0052] The specific preparation method of the functional monomer in formula VII is as follows: 2mmol ethanolamine and 2mmol potassium naphthalene are added to tetrahydrofuran, completely dissolved at room temperature to obtain an alcoholate initiator; 30mmol pure dry DEA monomer is quickly added to the mixed solution , after reacting at room temperature for 5 hours, the product was repeatedly precipitated and purified with cold n-hexane, and set aside; 60 mL of dichloromethane and 14 mmol of triethylamine were...

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Abstract

The invention provides a pH-responsive modified polyacrylamide oil displacement agent and a preparation method thereof. The oil displacement agent is composed of 10-85wt% of acrylamide, 10-40wt% of sodium acrylate, 5-35wt% of poly N, N-diethylamido ethyl methacrylate, 5-15wt% of acrylic polyethylene oxide-propylene oxide, auxiliary, initiator and water. The invention further provides a preparationmethod of the oil displacement agent. The oil displacement agent can effectively lower viscosity of crude oil during crude oil extraction, is highly responsive to acidity and alkalinity and can effectively increase crude oil recovery ratio.

Description

technical field [0001] The invention relates to an oil-displacement agent, in particular to a pH-responsive modified polyacrylamide oil-displacement agent and a preparation method thereof, belonging to the technical field of oil-displacement oil exploitation. Background technique [0002] In recent years, the research and development of environmentally responsive oil displacement agents has become one of the hot spots in the academic and industrial fields. Due to its unique, excellent performance and environmental responsiveness, it has potential and huge application prospects in many fields such as oilfield chemistry, material science, extraction and separation, and catalysis. With the decline of easily exploitable oil reserves and the increasing difficulty of emulsified crude oil treatment, the development of oil displacement agents with adjustable emulsification and demulsification behavior has become the focus of many scholars' research. [0003] Chemical flooding is th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F283/06C08F220/56C08F220/06C08F220/36C09K8/588
CPCC08F283/065C09K8/588C08F220/365
Inventor 侯庆锋郭东红陈刚杨惠胡广新
Owner PETROCHINA CO LTD
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