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A nano oil displacement agent for tertiary oil recovery and preparation method thereof

An oil-displacing agent and nanotechnology, which are 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 oil-displacing agent efficiency, etc. Oil efficiency, waste avoidance, improved rock wettability

Active Publication Date: 2021-01-26
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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  • A nano oil displacement agent for tertiary oil recovery and preparation method thereof
  • A nano oil displacement agent for tertiary oil recovery and preparation method thereof
  • A nano oil displacement 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 displacement agent for tertiary oil recovery and a preparation method thereof. The invention adopts a low-energy emulsification method to prepare an O / W nano-emulsion, mixes deionized water and a surfactant in a certain proportion, and heats and stirs evenly , to obtain a surfactant aqueous solution; mix the oil phase and co-surfactant in a certain proportion, heat and stir evenly to obtain an oil mixture; add the surfactant aqueous solution dropwise to the oil mixture, after the addition is completed, heat and stir to emulsify for a period After a period of time, a nanoscale emulsion is obtained. The low-energy emulsification method used in the present invention requires less external energy, has simple equipment, and avoids a large amount of energy waste. The average particle size of the prepared nanoemulsion is less than 50nm, and the interfacial tension can reach 10 ‑4 On the order of mN / m, ultra-low interfacial tension is formed, and the stable storage time is more than 180 days. At room temperature for half a year, there will be no phenomena such as layering and floating, coalescence, sedimentation, flocculation, etc., and the particle size of the emulsion remains basically 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 Patents(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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