High-recovery-ratio tertiary oil recovery displacement agent

A technology for oil recovery and oil displacement agent, which is applied in the field of high oil recovery factor tertiary oil recovery oil displacement agent, can solve the problems of low stability of compound flooding, low oil recovery rate, etc., and achieves increased two-phase interface compatibility, The effect of enhancing oil recovery and increasing viscosity

Inactive Publication Date: 2019-11-12
HEFEI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, composite flooding refers to achieving the purpose of oil displacement through the system effect of alkali, surfactant and polymer. However, the stability of composite flooding is not high at present, and the recovery factor is not high.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] A high-recovery tertiary oil-displacement agent, the raw materials of which include, by weight, 1.5 parts of polyacrylamide, 0.5 parts of modified nano silicon dioxide, 7 parts of surfactant, 0.7 parts of sodium carbonate and 125 parts of water.

Embodiment 2

[0018] A high recovery tertiary oil displacement agent, its raw materials include by weight: 1 part of polyacrylamide, 0.6 part of γ-methacryloxypropyl trimethoxysilane modified nano silicon dioxide, surfactant 6 parts, 1 part sodium carbonate, 100 parts water;

[0019] Among them, the surfactant is sodium lignosulfonate, dodecyl dimethyl hydroxypropyl sulfobetaine, fluorocarbon surfactant, wherein, sodium lignosulfonate, dodecyl dimethyl hydroxypropyl The weight ratio of sulfobetaine to fluorocarbon surfactant is 1.5:4:2.

Embodiment 3

[0021] A high recovery tertiary oil displacement agent, its raw materials include by weight: 2 parts of polyacrylamide, 0.4 parts of γ-methacryloxypropyl trimethoxysilane modified nano silicon dioxide, surfactant 8 parts, 0.5 parts of sodium carbonate, 150 parts of water;

[0022] Among them, the surfactant is sodium lignosulfonate, dodecyl dimethyl hydroxypropyl sulfobetaine, fluorocarbon surfactant, wherein, sodium lignosulfonate, dodecyl dimethyl hydroxypropyl The weight ratio of sulfobetaine to fluorocarbon surfactant is 0.75:5:1;

[0023] Polyacrylamide is prepared by free radical reaction of acrylamide, 2-methacryloxyethyl-dimethyldodecyl ammonium bromide and 2-acrylamide-2-methylpropanesulfonic acid under the action of an initiator Obtain, wherein, the molecular weight of polyacrylamide is 60-80 ten thousand, and acrylamide, 2-methacryloxyethyl-dimethyl dodecyl ammonium bromide, 2-acrylamide-2-methylpropanesulfonate The weight ratio of acid and initiator is 20:0.4:2:0...

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PUM

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Abstract

The invention discloses a high-recovery-ratio tertiary oil recovery displacement agent which comprises the following raw materials in parts by weight: 1-2 parts of polyacrylamide, 0.4-0.6 part of modified nano silicon dioxide, 6-8 parts of a surfactant, 0.5-1 part of sodium carbonate and 100-150 parts of water. By compounding the modified nano silicon dioxide with the proper surfactant, the compatibility of the two-phase interface is improved, so that the dispersed phase is not easy to condense, the stability of the emulsion is improved, the capillary resistance is reduced, the oil-water interfacial tension is greatly reduced, and the recovery ratio is improved. Furthermore, through mutual cooperation of the other substances, the temperature resistance, the salt resistance and the recoveryratio of the tertiary oil recovery oil displacement agent are further improved.

Description

technical field [0001] The invention relates to the technical field of oil displacement agents, in particular to an oil displacement agent for high oil recovery tertiary recovery. Background technique [0002] The oil extraction process can be divided into primary oil recovery, secondary oil recovery and tertiary oil recovery. Both primary and secondary oil recovery are recovered through physical methods, and primary oil recovery and secondary oil recovery can only recover about one-third of the crude oil reserves. Tertiary oil recovery is the only way to greatly enhance oil recovery. [0003] The use of chemical substances to improve the performance of oil, gas, water and rocks to extract more oil is called tertiary oil recovery. Oil displacement agent is an important means to enhance oil recovery in tertiary oil recovery. Oil displacement agents can be divided into polymer flooding, alkali flooding, surfactant flooding, and composite flooding. Among them, composite flo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/58C09K8/584
CPCC09K8/58C09K8/584C09K2208/10
Inventor 朱仁发
Owner HEFEI UNIV
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