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Organic-inorganic composite oil displacement agent, organic-inorganic composite oil displacement system, preparation method and application thereof

A compound oil displacement and organic technology, applied in the field of oil displacement agents, can solve the problems of limited application range of polyacrylamide system, achieve the effects of reducing environmental sensitivity, easy availability of raw materials, and enhancing stability

Active Publication Date: 2020-10-20
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] One of the objectives of the present invention is to provide an inorganic-organic composite oil displacement agent to alleviate the technical problem of the limited application range of the existing polyacrylamide system in the development of high-temperature and high-salt reservoirs

Method used

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  • Organic-inorganic composite oil displacement agent, organic-inorganic composite oil displacement system, preparation method and application thereof
  • Organic-inorganic composite oil displacement agent, organic-inorganic composite oil displacement system, preparation method and application thereof
  • Organic-inorganic composite oil displacement agent, organic-inorganic composite oil displacement system, preparation method and application thereof

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preparation example Construction

[0066] According to a third aspect of the present invention, the present invention provides a method for preparing the above-mentioned inorganic-organic composite oil displacement system, comprising the steps of:

[0067] (a) adding the electropositive amphiphilic polymer into water and mixing uniformly to obtain a dispersed solution;

[0068] (b) adding negatively charged inorganic nanoparticles into the dispersion solution and mixing uniformly to obtain an inorganic-organic composite oil displacement system.

[0069] The preparation method of the inorganic-organic composite oil displacement system provided by the invention has easy-to-obtain raw materials, is convenient to operate, and has broad application prospects in oil field development.

[0070] In a preferred embodiment of the present invention, in step (b), add negatively charged inorganic nanoparticles into the dispersion solution, mix well, put into a constant temperature water bath at 45-55°C, and keep warm for 20...

Embodiment 1

[0077] This embodiment provides an inorganic-organic composite oil displacement agent, including 0.5 g of hydroxyl-modified silica, and 10 g of a salt-increased positively charged amphiphilic polymer. The structural formula of the salt-increased positively charged amphiphilic polymer is: :

[0078]

[0079] x is 80-200, y is 4-30, z is 1-5; the weight average molecular weight of the salt-adhesive amphiphilic polymer is 3.58×10 6 ; Hydroxy-modified silica was purchased from Beijing Deke Daojin Technology Co., Ltd.

Embodiment 2

[0081] This embodiment provides an inorganic-organic composite oil displacement agent, comprising 2 g of hydroxyl-modified silica, 2 g of a salt-increased electropositive amphiphilic polymer, and the salt-increased electropositive amphiphilic polymer and a hydroxyl-modified amphiphilic polymer. Silicon dioxide is all the same batch as the raw material in Example 1.

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Abstract

The invention provides an organic-inorganic compound oil displacement agent, an organic-inorganic compound oil displacement system as well as a preparation method and application and relates to the technical field of oil displacement agents. The organic-inorganic compound oil displacement agent comprises the following raw materials in parts by mass: 5-20 parts of electronegative inorganic nano-particles and 20-100 parts of electropositive amphiphilic polymers. The technical problem that the conventional polyacrylamide has a limited application range in high-temperature high-salt reservoir development is solved. After the organic-inorganic compound oil displacement agent provided by the invention is mixed with injected oil field water to prepare the oil displacement system, by virtue of charge attraction of the electronegative inorganic nano-particles and the electropositive amphiphilic polymers, the plastic viscosity of the oil displacement system is obviously improved, and the environmental sensitivity of the oil displacement system is reduced, so that the organic-inorganic compound oil displacement agent has wide application prospects in the high-temperature high-salt reservoir development.

Description

technical field [0001] The invention relates to the technical field of oil displacement agents, in particular to an organic-inorganic composite oil displacement agent, an organic-inorganic composite oil displacement system, a preparation method and an application. Background technique [0002] Water injection development has become an essential part of the development process of major oilfields in my country, but in the process of water injection development, due to the heterogeneity of the formation, water flooding and water channeling are very easy to occur in the process of water injection development. Using polymers to carry out oil displacement work has become one of the most commonly used measures in mine fields. However, with the large-scale development of high-temperature and high-salt reservoirs, the oil displacement effect of conventional polymer systems is limited. The currently commonly used partially hydrolyzed polyacrylamide system is easy to degrade at high t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/58C09K8/588
CPCC09K8/58C09K8/588C09K2208/10
Inventor 杨红斌康万利曹长霄朱洲宋叔阳高永博邵硕陈超王鹏祥
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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