Polymer microgel oil-displacing agent, preparing method thereof and applications thereof

A microgel oil displacing agent and polymer technology, which are applied in the directions of drilling compositions, chemical instruments and methods, can solve problems such as poor temperature resistance, achieve suitable particle size, good plugging effect, and preparation method. simple effect

Active Publication Date: 2014-09-03
中国石油勘探开发研究院采油工程研究所 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to solve the problem of poor temperature resistance of existing polymer oil displacement agents, the pres

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] At room temperature, 120 parts by weight of dispersant and 40 parts by weight of Tween-80 and Span-80 composite emulsifier (i.e. Tween80-Span80 composite emulsifier) ​​are mixed to obtain mixed solution 1, wherein Tween80-Span80 composite emulsifier The mass ratio of Tween80 and Span80 is 1:1;

[0034] Get the aqueous solution of 40 parts by weight of polyvinyl alcohol, 10 parts by weight of dilute hydrochloric acid and 10 parts by weight of diluted formaldehyde aqueous solution and mix to obtain mixed solution 2, wherein the weight percentage of polyvinyl alcohol in the aqueous solution of polyvinyl alcohol is 10%, polyethylene The degree of polymerization of alcohol is 200-6000, the concentration of dilute hydrochloric acid is 5%, and the concentration of formaldehyde solution is 5%;

[0035] Take 16 parts by weight of acrylamide, 0.01 part by weight of ammonium persulfate, 0.2 parts by weight of N,N'-methylene bisacrylamide and 10 parts by weight of water and mix to ...

Embodiment 2

[0041] Mix 30 parts by weight of dispersant and 0.3 parts by weight of Tween80-Span80 composite emulsifier at room temperature to obtain mixed solution 1, wherein the mass ratio of Tween80 and Span80 in Tween80-Span80 composite emulsifier is 1:4;

[0042] Get 5 parts by weight of an aqueous solution of polyvinyl alcohol, 0.025 parts by weight of dilute hydrochloric acid and 0.025 parts by weight of diluted formaldehyde solution and mix to obtain a mixed solution 2, wherein the weight percentage of polyvinyl alcohol in the aqueous solution of polyvinyl alcohol is 20%, polyethylene The degree of polymerization of alcohol is 200-6000, the concentration of dilute hydrochloric acid is 15%, and the concentration of formaldehyde solution is 30%;

[0043] Mix 1 part by weight of acrylamide, 0.005 part by weight of sodium persulfate, 0.05 part by weight of N,N'-methylenebisacrylamide and 2 parts by weight of water to obtain a mixed solution 3;

[0044] At a stirring speed of 100 rpm, a...

Embodiment 3

[0049] At room temperature, 400 parts by weight of a dispersant and 60 parts by weight of a Tween80-Span80 composite emulsifier were mixed to obtain a mixed solution 1, wherein the mass ratio of Tween80 and Span80 in the Tween80-Span80 composite emulsifier was 10:1;

[0050] Get 80 parts by weight of an aqueous solution of polyvinyl alcohol, 10 parts by weight of dilute hydrochloric acid and 10 parts by weight of diluted formaldehyde solution and mix to obtain a mixed solution 2; wherein, the percentage by weight of polyvinyl alcohol in an aqueous solution of polyvinyl alcohol is 5%, and polyethylene The degree of polymerization of alcohol is 200-6000, the concentration of dilute hydrochloric acid is 25%, and the concentration of formaldehyde solution is 10%;

[0051] Take 20 parts by weight of acrylamide, 1 part by weight of potassium persulfate, 1 part by weight of N,N'-methylenebisacrylamide and 15 parts by weight of water and mix to obtain a mixed solution 3;

[0052] At a...

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Abstract

The invention relates to the technical field of petroleum recovery efficiency increasing, profile control, flooding, water plugging, and other production increasing fields in oilfield development, and discloses a polymer microgel oil-displacing agent, a preparing method thereof and applications thereof. By adopting a water soluble hydroxy-containing monomer and/or a water soluble hydroxy-containing polymer as the main molecule and by adopting an acrylamide monomer as an auxiliary molecule, the polymer microgel oil-displacing agent is prepared by one-step in-situ crosslinking through an inverse emulsion polymerization method. The preparing process is simple. The prepared polymer microgel oil-displacing agent has characteristics of hydration swelling, elastic deformation, high-temperature resistance, and high-salt resistance, and can be used in an oilfield having a temperature of 20-160 DEG C.

Description

technical field [0001] The invention relates to the fields of oil field development, oil recovery enhancement, profile control, flood control, water plugging and other production increasing technologies, in particular to a polymer microgel oil displacement agent and its preparation method and application. Background technique [0002] Due to the primary or secondary heterogeneity of the formation and the difference in fluid mobility in the oil field developed by water flooding, the dominant seepage channel of water flow will be formed underground, which makes the efficiency of water flooding oil displacement low. In order to solve this problem, various technical measures are usually used to block or limit the water absorption of the dominant seepage channel and increase the sweep coefficient of the injected water, thereby improving the water flooding effect. Polymer flooding is a large category of chemical flooding. In EOR enhanced oil recovery technology, the use of polymer...

Claims

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Application Information

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IPC IPC(8): C08F220/56C08F2/32C08J3/24C09K8/588C09K8/512
Inventor 梁玉彪吴新敏李秀影郝翔
Owner 中国石油勘探开发研究院采油工程研究所
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