Nanometer emulsion oil-displacing agent and preparation method thereof

A nano-emulsion and oil-displacing agent technology, applied in chemical instruments and methods, drilling compositions, etc., can solve the problem that oil displacement sweep volume and oil displacement efficiency cannot be optimized, and it is difficult to maximize oil displacement and reduce viscosity. Insufficient capacity and other problems, to achieve the effect of strong surface activity, increased sweep volume, and cost reduction

Active Publication Date: 2019-01-18
GUANGHAN HUAXING NEW TECH DEV INST GENERAL PARTNERSHIP +1
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

For example, Wang Jianhua of Shengli Oilfield Shengli Project proposed to use nano-silica modified sulfonate surfactant to prepare oil displacement agent, which has strong surface activity, good compatibility with oil reservoirs, low interfacial tension, and easy biodegradation. Advantages, but there are also high production costs, low efficiency of oil displacement agents, and interfacial tension. In some oil fields, it is difficult to meet the requirements of ultra-low interfacial tension in the formation.
Another example is the nano-type oil displacement agent proposed by Li Xiangdong of Fushun Group Holding Co., Ltd. for the thermal oil recovery process. It can be used in the field of thermal oil recovery to solve the emulsification and plugging problem of oil layers, but the products in other areas still have poor adaptability, insufficient viscosity reduction ability, and high cost, which does not meet the current concept of cost reduction and efficiency increase
In these schemes, it is still impossible to optimize the swept volume of oil displacement and oil displacement efficiency, that is, it is difficult to achieve the maximum oil displacement in terms of unit cost, and the existing technologies cannot fully adapt to the current situation of low-cost development

Method used

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  • Nanometer emulsion oil-displacing agent and preparation method thereof

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preparation example Construction

[0034] The present invention provides the preparation method of the nanoemulsion oil displacement agent described in above-mentioned scheme, comprises the steps:

[0035] (1) under the condition of nitrogen protection, the cross-linking agent and the monomer alkali-water mixture are mixed to obtain the monomer aqueous phase solution;

[0036] (2) Mineral oil is mixed with an emulsifier to obtain an oil phase;

[0037] (3) adding the oil phase obtained in the step (2) to the aqueous monomer solution obtained in the step (1) for emulsification to obtain an emulsion;

[0038] (4) under the condition of nitrogen protection, the oxidant, reducing agent and the emulsion obtained in the step (3) are mixed and polymerized to obtain a nanoemulsion oil displacement agent;

[0039] There is no limitation on the order of the steps (1) and (2).

[0040] In the invention, the cross-linking agent is mixed with the monomer alkali-water mixed liquid under the nitrogen protection condition to...

Embodiment 1

[0052] A nanoemulsion oil displacement agent, prepared from raw materials comprising the following parts by weight: 45 parts of mineral oil, 6 parts of emulsifier, 48 parts of monomer alkali-water mixture, 0.2 part of crosslinking agent, 0.3 part of oxidizing agent, reducing agent 0.5 copies;

[0053] The preparation method of above-mentioned nanoemulsion oil displacement agent, comprises the steps:

[0054] Weigh each raw material according to the stated weight, put the sodium acrylate aqueous solution with a mass concentration of 60% in the reaction kettle, and pass through nitrogen to remove the air, add N,N-methylenebisacrylamide and stir evenly to obtain the sodium acrylate aqueous phase solution; add the mixture of Span 80 and Tween 60 to industrial white oil and stir evenly to obtain an oil phase; add the oil phase to the reaction kettle and mix it with the sodium acrylate aqueous phase solution, and stir at a rate of 1600 rpm to form a milky white emulsion; Raise the ...

Embodiment 2

[0056] A nanoemulsion oil displacement agent, prepared from the following raw materials by weight: 37 parts of mineral oil, 4 parts of emulsifier, 30 parts of monomer alkali-water mixture, 0.5 part of crosslinking agent, 0.05 part of oxidizing agent, reducing agent 0.04 part; Preparation method is identical with embodiment 1.

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Abstract

The invention provides a nanometer emulsion oil-displacing agent and a preparation method thereof. The nanometer emulsion oil-displacing agent provided by the invention comprises the following ingredients in parts by weight: 30-45 parts of mineral oil, 3-8 parts of an emulsifier, 30-50 parts of monomer alkaline and water mixed liquor, 0.01-0.5 part of a cross-linking agent, 0.05-0.5 part of an oxidizing agent and 0.04-0.7 part of a reductant. According to the nanometer emulsion oil-displacing agent, raw materials are mixed and stirred orderly to form the emulsion of a water in oil system. Themolecular weight of the prepared nanometer emulsion oil-displacing agent is greater than 2000 thousands, a grain size in a particle is less than 40nm, interfacial tension is 9.0*10<-5>-8.6*10<-4>/m, astable storage period is greater than 240 days, and layering is unlikely to happen. The nanometer emulsion oil-displacing agent can reach any corner communicated with an oil deposit, rock surface wettability is changed, and swept volume is improved so as to be favorable for peeling and harvesting crude oil.

Description

technical field [0001] The invention relates to the technical field of polymer synthesis, in particular to a nanoemulsion oil displacement agent and a preparation method thereof. Background technique [0002] Most of the oil fields with medium and high permeability developed by water injection in my country have entered the period of high water cut and high recovery degree. Most of the oil layers in the oil fields have been flooded, and the remaining oil is scattered seriously. Low, the oil washing efficiency of water flooding is extremely low, the swept volume is small, the injection pressure is high, and the development is difficult. In order to improve oil recovery efficiency, a series of methods have been continuously explored at home and abroad, such as the use of polymer flooding, alkaline water flooding, surfactant flooding, etc. These methods have achieved some results and encountered difficulties in their application series of questions. [0003] The method of addi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/584C09K8/588
CPCC09K8/584
Inventor 方天成方美良陈昭陈红军蒙柏成
Owner GUANGHAN HUAXING NEW TECH DEV INST GENERAL PARTNERSHIP
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