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Nano oil-displacing agent for tertiary oil recovery and preparation method thereof

An oil-displacing agent, nanotechnology, applied in the field of nano-oil-displacing agent for tertiary oil recovery and its preparation, can solve the problems of high production cost of nano-emulsion, poor temperature and salt resistance, low efficiency of oil-displacing agent, etc. Oil efficiency, waste avoidance, effect on improving rock wettability

Active Publication Date: 2019-08-16
SOUTHWEST PETROLEUM UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in actual application in oil fields, nanoemulsions have problems such as high production costs, poor temperature and salt resistance, low efficiency of oil displacement agents, incompatibility with oil layers, and high viscosity.

Method used

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  • Nano oil-displacing agent for tertiary oil recovery and preparation method thereof
  • Nano oil-displacing agent for tertiary oil recovery and preparation method thereof
  • Nano oil-displacing agent for tertiary oil recovery and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] A nano-oil displacement agent for tertiary oil recovery provided by a preferred embodiment of the present invention comprises the following components in parts by weight: 4.5 parts of oil phase (2.25 parts of white oil, 2.25 parts of liquid paraffin), 4.5 parts of anion-cation composite surface 0.4 part of active agent (0.32 part of cationic surfactant cetyltrimethylammonium bromide (CTAB), 0.08 part of anionic surfactant sodium dodecylbenzenesulfonate (SDBS)), co-surfactant (positive Butanol) 0.1 part, deionized water 95 parts.

[0038] Preparation of nano oil displacement agent by phase inversion composition method (PIC):

[0039] Add the cationic surfactant cetyltrimethylammonium bromide (CTAB) and the anionic surfactant sodium dodecylbenzenesulfonate (SDBS) into water to prepare an aqueous surfactant solution and heat it to 65°C; Heat 68# white oil, liquid paraffin, and co-surfactant n-butanol to 65°C in another reactor, and stir at 600rpm to form an oil mixture; a...

Embodiment 2

[0041] A nano-oil displacement agent for tertiary oil recovery provided by a preferred embodiment of the present invention comprises the following components in parts by weight: 4.5 parts of oil phase (2.25 parts of white oil, 2.25 parts of liquid paraffin), 4.5 parts of anion-cation composite surface 0.6 part of active agent (0.48 part of cationic surfactant cetyltrimethylammonium bromide (CTAB), 0.12 part of anionic surfactant sodium dodecylbenzenesulfonate (SDBS)), cosurfactant (positive Butanol) 0.1 part, deionized water 94.9 parts.

[0042] Preparation of nano oil displacement agent by phase inversion composition method (PIC):

[0043] Add the cationic surfactant cetyltrimethylammonium bromide (CTAB) and the anionic surfactant sodium dodecylbenzenesulfonate (SDBS) into water to prepare an aqueous surfactant solution and heat it to 65°C; Heat white oil, liquid paraffin, and co-surfactant n-butanol in another reactor to 65°C, and stir at 600rpm to form an oil mixture; add su...

Embodiment 3

[0045] A nano-oil displacement agent for tertiary oil recovery provided by a preferred embodiment of the present invention comprises the following components in parts by weight: 4.5 parts of oil phase (2.25 parts of white oil, 2.25 parts of liquid paraffin), 4.5 parts of anion-cation composite surface 0.8 part of active agent (0.64 part of cationic surfactant cetyltrimethylammonium bromide (CTAB), 0.16 part of anionic surfactant sodium dodecylbenzenesulfonate (SDBS)), co-surfactant (positive Butanol) 0.1 part, deionized water 94.6 parts.

[0046] Preparation of nano oil displacement agent by phase inversion composition method (PIC):

[0047] Add the cationic surfactant cetyltrimethylammonium bromide (CTAB) and the anionic surfactant sodium dodecylbenzenesulfonate (SDBS) into water to prepare an aqueous surfactant solution and heat it to 65°C; Heat white oil, liquid paraffin, and co-surfactant n-butanol in another reactor to 65°C, and stir at 600rpm to form an oil mixture; add...

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Abstract

The invention discloses a nano oil-displacing agent for tertiary oil recovery and a preparation method thereof. A low-energy emulsification method is adopted to prepare an O / W type nano emulsion, deionized water and a surfactant are mixed in a certain ratio, and then even heating and stirring are carried out to obtain an aqueous solution of the surfactant; an oil phase and a co-surfactant are mixed in a certain ratio, and then even heating and stirring are carried out to obtain an oil mixture; the aqueous solution of the surfactant is dropwise added to the oil mixture, heating and stirring arecarried out for a period of time for emulsion after the dropping addition is completed, so that the nano-scale emulsion is obtained. The used low-energy emulsification method requires less additionalenergy, equipment is simple, and a large amount of energy waste is avoided. The prepared nano emulsion has an average particle size of less than 50 nm, the interfacial tension can be up to a magnitude order of 10<-4> mN / m, an ultra-low interfacial tension is formed, the stable storage time is more than 180 days, no layering floating, coalescence, sedimentation, flocculation and other phenomena occur after the nano emulsion is placed for half a year at room temperature, and the emulsion particle size basically remains unchanged.

Description

technical field [0001] The invention belongs to the technical field of oil displacement agents for oil recovery, and in particular relates to a nanometer oil displacement agent for tertiary oil recovery and a preparation method thereof. Background technique [0002] The main body of the oil field developed by water flooding has entered the "double high" development stage of high water cut and high recovery degree. my country's oilfields are mostly continental deposits, with serious heterogeneity in oil layers, high wax content, high aromatics content, and high viscosity in crude oil, so the water flooding recovery rate is low, with an average of about 33%, and more than 60% of the geological reserves still need to be used "tertiary oil recovery" for extraction. Research shows that chemical flooding is the main EOR method suitable for oilfields in my country. Chemical flooding (including polymer flooding and composite flooding) can increase recovery by 10%-19%, and increase ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/58C09K8/52B82Y30/00B82Y40/00
CPCB82Y30/00B82Y40/00C09K8/52C09K8/58
Inventor 魏兵田庆涛毛润雪蒋敏李冬爽
Owner SOUTHWEST PETROLEUM UNIV
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