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Multi-grafting site nano-carbon material and active nano-carbon material, preparation method thereof, and oil displacement system for ultra-low permeability reservoirs

A technology of nano-carbon materials and grafting sites, which is applied in the fields of oil displacement systems for ultra-low permeability reservoirs, multi-grafting site nano-carbon materials and active nano-carbon materials and their preparation, and can solve the poor effect of oil displacement systems and other problems, to achieve the effect of flexible construction, simple preparation method and simple on-site operation

Active Publication Date: 2021-11-16
CHINA UNIV OF PETROLEUM (EAST CHINA) +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to overcome the defect of the poor effect of the oil displacement system used in the ultra-low permeability reservoirs in the prior art, and provide a multi-grafting site nano-carbon material and active nano-carbon material and its preparation method and super Oil displacement system for low permeability reservoir

Method used

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  • Multi-grafting site nano-carbon material and active nano-carbon material, preparation method thereof, and oil displacement system for ultra-low permeability reservoirs
  • Multi-grafting site nano-carbon material and active nano-carbon material, preparation method thereof, and oil displacement system for ultra-low permeability reservoirs
  • Multi-grafting site nano-carbon material and active nano-carbon material, preparation method thereof, and oil displacement system for ultra-low permeability reservoirs

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preparation example Construction

[0046] The second aspect of the present invention provides a method of preparing a multi-graft site nanocarbon material described above, wherein the preparation method comprises:

[0047] (F) 1 ) Disperse the oxide nanocarbon material in the first organic solvent to obtain a dispersion;

[0048] (F) 2 ) The dispersion is grafted with the grafted agent.

[0049] (F) 3 ) Will be stepped (f 2 The solution was centrifuged, steamed and grinding treatment, gave a multi-graft site nanocarbon material;

[0050] Among them, the oxidized nanocarbon material has the structure shown in formula (3):

[0051]

[0052] Among them, the graff processes are selected from one or more of toluene diisocyanate, diphenyl methane diisocyanate, isophorone diisocyanate, and bicyclic hexamol diisocyanate.

[0053] According to the present invention, in particular, the grafted agent is diphenylmethane diisocyanate.

[0054] According to the present invention, the first organic solvent is selected from one ...

specific Embodiment approach

[0064] According to a preferred embodiment of the present invention, the preparation method of the multi-grafted site nanocarbon material includes:

[0065] At room temperature (20 ± 5 ° C), the oxidant nanocarbon material (120-140 nm) was added in toluene, and stirred at a stirring rate of 400-600 rpm underwent 10-20 min; Private agents, stirring at 70-90 ° C for 3-5 h, a multi-graft site nanocarbon material solution; the above-mentioned solution is dispersed, sputum and abrasive, to obtain a multi-graft site nanometer Carbon material.

[0066] A third aspect of the invention provides a method of preparation of an active nanocarbon material, wherein the preparation method comprises:

[0067] (F) 4 The multi-grafted site nanocarbon material described above is dispersed in the second organic solvent to obtain a dispersion;

[0068] (F) 5 In the presence of a catalyst, the dispersion is active with the active agent to active reactions;

[0069] (F) 6 ) Will be stepped (f 5 The solut...

Embodiment 1

[0104] This embodiment is to explain the multi-graft nanocarbon material prepared by the method of the present invention.

[0105] (F) 1 At room temperature (15 ° C), 13.26 g of a nanocarbon material of 13.26 g of a particle diameter of 140 nm was added in 86 g of toluene, and stirred at a stirring rate of 400 rpm under conditions for 10 min;

[0106] (F) 2 A 0.74 g of toluene diisocyanate was added while stirring, stirring for 3 h at 70 ° C oil bath, and a polygraphic site nanocarbon material solution was obtained.

[0107] (F) 3 The solution obtained above was centrifuged at a rotational speed of 8000 r / min; centrifugally by centrifugation at 60 ° C; 0. The abrasive dispersion 4 times, each time grinding 9 min;

[0108] As a result, a multi-grafted site nanocarbon material having a particle diameter of 116 nm is obtained, and the multi-graft site nanocarbon material comprises structural units, hydroxyl groups and formula (2) shown in formula (1), wherein The structural unit sh...

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Abstract

The invention belongs to the field of oilfield chemistry, and discloses a multi-grafting site nano-carbon material and an active nano-carbon material, a preparation method thereof, and an oil displacement system for ultra-low permeability oil reservoirs. The multi-grafted site nanocarbon material includes a structural unit represented by formula (1), a hydroxyl group and a structural unit represented by formula (2); wherein, R is selected from tolyl, diphenylmethane, isophor One or more of ketone group and dicyclohexylmethane group; the oil displacement system for ultra-low permeability oil reservoir has high interfacial activity, and the oil-water interfacial tension is reduced by 10 ‑2 On the order of mN / m, it can significantly improve the oil washing efficiency.

Description

Technical field [0001] The invention belongs to the field of oilfield chemistry, and more particularly to a multi-graft site nanocarbon material and an active nanocarbon material and a preparation method thereof and an ultra-low oozing oil reservoir. Background technique [0002] With the rapid growth of my country's national economy, the demand for petroleum resources is continuously improved. Therefore, increase the exploration of oil and gas resources, and improve the mining efficiency of the existing blocks is one of the most effective ways in my country's saving oil resources from the source. At present, the proportion of ultra-low osmotic reservoirs in my country's new proven reserves has increased significantly, but the type of reservoir is low. [0003] Fracturing technology is an important technique for improving ultra-low permeability reservoirs. Through fracturing modification, there are numerous micro-nano-stage artificial cracks in ultra-low osmotic oil reservoirs to...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/58C09K8/584C07C263/16C07C265/12C07C265/08C07C265/04C07C303/02C07C309/14C07C51/41C07C65/19C01B32/15
CPCC09K8/58C09K8/584C07C263/16C07C265/12C07C265/08C07C265/04C07C303/02C07C309/14C07C51/412C07C65/19C01B32/15C09K2208/10C09K2208/34C01B32/342C01B32/372C01P2004/62C01P2004/64B82Y30/00B82Y40/00
Inventor 赵光戴彩丽梁立豪吕东方由庆刘逸飞杨宁孙宁
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)