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Nano oil displacement agent and preparation method and application thereof

An oil-displacing method and oil-displacing agent technology, which are applied in chemical instruments and methods, earth-moving drilling, and fluid production, etc., can solve the problems of unknown effect, difficulty in stabilizing nano-materials, and large dosage, and achieve flocculation prevention, easy action, The effect of expanding the affected area

Inactive Publication Date: 2020-07-17
NINGBO FENGCHENG NANOTECHNOLOGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in this report, the amount of PSS used to stabilize nanomaterials is extremely large, which is 100 times that of nanomaterials; the salinity (salinity) of the system increases, and the amount of PSS needs to be increased; the sulfonic acid group in PSS has A large number of charges are easily adsorbed at the core inlet (similar to surfactants), which makes it difficult for nanomaterials to stabilize, ranging from being unable to function deep in the formation, to aggregating nanomaterials and blocking the port; there is no data related to oil displacement, and the effect unknown

Method used

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  • Nano oil displacement agent and preparation method and application thereof
  • Nano oil displacement agent and preparation method and application thereof
  • Nano oil displacement agent and preparation method and application thereof

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Effect test

preparation example Construction

[0073] Introduce the preparation method of the modified nanomaterial in this application below:

[0074] The preparation method of the modified graphene oxide nanosheet adopts the preparation method commonly used in the prior art, and a common preparation method is introduced below: See references: Luo D, Zhang F, Zheng H, et al.Electrostatic-attraction-induced high internal phase emulsion for large-scale synthesis of amphiphilic Janus nanosheets[J].Chemical Communications,2019.;

[0075] The preparation method of modified titanium dioxide adopts the commonly used preparation method in the prior art, and a common preparation method is introduced below: See references: Feng Xiaoyu, Hou Jirui, Cheng Tingting, et al. Preparation of oleic acid modified nano-TiO2 and its flooding Oil performance evaluation [J]. Oilfield Chemistry, 2019.

[0076] The preparation method of modified silicon dioxide, adopts the preparation method commonly used in the prior art, introduces a kind of co...

Embodiment 1

[0081] 1. Take the nanometer amphiphilic graphene oxide dispersion (converted to 1 part of dry powder mass), add 5 parts of anionic surfactant (specifically sodium lauryl sulfate), stir and mix for 30 minutes (rotating speed 100 rpm), and get mixture.

[0082] 2. Dissolve polyacrylamide (anionic, molecular weight: 16 million) in pure water to prepare a mother liquor with a concentration of 10,000 mg / L.

[0083] 3. Add 1000 parts by mass of the polymer mother liquor obtained in step 2 to 1 part by mass of the mixed solution in step 1, rotate at a speed of 500 rpm, and stir for 30 minutes to obtain a high-temperature salt-resistant nano-oil displacing agent, which is recorded as a sample 1#.

[0084] In sample 1#, the ratio of the mass fractions of the nanomaterial nano-amphiphilic graphene oxide, the anionic surfactant sodium dodecyl sulfate, and polyacrylamide is 1:5:10.

Embodiment 2

[0086] 1. Take the modified nano-silica dispersion (1 part converted into dry powder), add 10 parts of cationic surfactant (specifically hexadecyltrimethylammonium bromide), stir and mix for 20 minutes (300 rpm / min) to obtain a mixed solution.

[0087] 2. Dissolve hydroxyethyl cellulose (purchased from Aladdin, with a molecular weight of 250,000) in pure water to prepare a mother liquor with a concentration of 6000 mg / L.

[0088] 3. Add 2000 parts by mass of the polymer mother liquor obtained in step 2 to 1 part by mass of the mixed solution in step 1, rotate at a speed of 500 rpm, and stir for 30 minutes to obtain a high-temperature salt-resistant nano-oil displacing agent, which is recorded as a sample 2#.

[0089] In sample 2#, the mass fraction ratio of nanomaterial-modified nano-silica, cationic surfactant cetyltrimethylammonium bromide, and water-soluble sodium polystyrene sulfonate is 1:10:12.

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Abstract

The invention discloses a nano oil displacement agent and a preparation method and application thereof. The nano oil displacement agent is characterized by comprising a nanometer material, a surfactant, a water-soluble polymer and water, and the water-soluble polymer is coated at the periphery of the nano material. The nano oil displacement agent is a temperature-resistant and salt-resistant oil-displacing agent, and ensures that a functional nano dispersion liquid does not flocculate or precipitate within a certain temperature and salinity range, the water-soluble polymer can be slowly decomposed under the conditions of high temperature and high salt, and meanwhile, the nano material is released, so that the functional nano material plays a role.

Description

technical field [0001] The invention relates to a nano oil displacement agent and its preparation method and application, belonging to the technical field of oil field exploitation. Background technique [0002] The oil industry is the foundation of my country's energy industry. With the continuous improvement of domestic oil demand, my country has also transformed from an oil exporter to a major oil importer. Oil has become a "bottleneck" restricting my country's economic growth. In order to effectively enhance oil recovery, new oil-displacing agents emerge in endlessly, but with little effect. [0003] As a new type of oil displacement agent, nano oil displacement agent has great advantages over traditional chemical oil displacement agents, such as high specific surface area, excellent biocompatibility, high recovery rate, etc. However, the general functional nanomaterials themselves have a certain charge, and are very easy to flocculate and precipitate in a high-salt env...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/584C09K8/588C09K8/58E21B43/22
CPCC09K8/58C09K8/584C09K8/588E21B43/16C09K2208/10
Inventor 张欢乐王金剑俞波王耀国
Owner NINGBO FENGCHENG NANOTECHNOLOGY CO LTD
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