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Chemical agent for reducing pressure and increasing injection in low permeability oilfield and preparation method thereof

A chemical agent and oilfield technology, which is applied in the field of depressurization and boosting chemical agent and its preparation in ultra-low permeability oilfield, can solve the problems of complicated preparation process of depressurizing and boosting agent, no mention of dispersion stability, etc., and achieve good depressurization and injection. effect, improving hydrophobicity, improving dispersion stability

Active Publication Date: 2021-05-14
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The preparation process of the pressure-reducing injection agent is complicated, and it is a water-based dispersion, and the dispersion stability in the organic phase is not mentioned.

Method used

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  • Chemical agent for reducing pressure and increasing injection in low permeability oilfield and preparation method thereof
  • Chemical agent for reducing pressure and increasing injection in low permeability oilfield and preparation method thereof
  • Chemical agent for reducing pressure and increasing injection in low permeability oilfield and preparation method thereof

Examples

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preparation example Construction

[0059] According to the present invention, the preparation method of the low-permeability oilfield depressurization injection chemical agent comprises: uniformly mixing double-grafted nano-silica and diesel oil at 60-80°C to obtain double-grafted nano-silica particles Transparent solution evenly dispersed in diesel oil;

[0060] Wherein, the preparation method of double-grafted nano silicon dioxide comprises:

[0061] (1) Under weakly acidic conditions and in an inert gas atmosphere, the methacrylic acid-(3-alkoxysilyl)-alkyl ester of the structure shown in formula (1-a) is mixed with silica nanoparticles The dispersion liquid is mixed and heated to reflux, and then the reaction product is subjected to solid-liquid separation and drying to obtain SiO grafted with a hydrophobic group of the structure shown in formula (1). 2 particles;

[0062] (2) Under ultraviolet light irradiation and under stirring, the SiO obtained in step (1) 2 The dispersion liquid of particle is conta...

preparation example 1

[0096] This preparation example is used to illustrate the preparation of the double-grafted nano-silica provided by the present invention.

[0097] Step (1): MPS modified nano silica:

[0098] Weigh 3g nano-SiO 2 (VK-SP12, particle size 12nm, Hangzhou Wanjing New Material Co., Ltd.) was dispersed in 100mL toluene, and ultrasonically dispersed for 40min under mechanical stirring. Weigh 3.96g MPS (wherein, R 1 , R 2 and R 3 Both CH 3 -, R 4 for -(CH 2 ) 3 -, IS10550, Bailingwei Technology Co., Ltd.) dissolved in 10mL absolute ethanol, MPS and SiO 2 The molar ratio of surface hydroxyl groups is 3:1, the pH value is adjusted to about 4 with hydrochloric acid, and added to a four-necked flask with nano-SiO 2 well mixed. Access to N 2 And cooling water, heated to toluene reflux temperature (110 ° C) for 2h. Then cooled to room temperature, centrifuged at 40000rpm for 30min, dried and extracted with a Soxhlet extractor (toluene as solvent) for 12h, dried in a vacuum oven ...

preparation example 2

[0102] This preparation example is used to illustrate the preparation of the double-grafted nano-silica provided by the present invention.

[0103]Step (1): MPS modified nano silica:

[0104] Weigh 4g nano-SiO 2 (VK-SP15, particle size 15nm, Hangzhou Wanjing New Material Co., Ltd.) was dispersed in 100mL toluene, and ultrasonically dispersed for 40min under mechanical stirring. Weigh 5.28g MPS (where R 1 for CH 3 -, R 2 and R 3 Both CH 3 CH 2 -, R 4 for -(CH 2 ) 2 -, IS10550, Bailingwei Technology Co., Ltd.) dissolved in 10mL absolute ethanol, MPS and SiO 2 The molar ratio of surface hydroxyl groups is 3:1, the pH value is adjusted to about 4 with hydrochloric acid, and added to a four-necked flask with nano-SiO 2 well mixed. Access to N 2 And cooling water, heated to toluene reflux temperature (110 ° C) for 3h. Then cooled to room temperature, centrifuged at 40000rpm for 30min, dried and extracted with a Soxhlet extractor (toluene as solvent) for 12h, dried in a...

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Abstract

The invention relates to the field of oilfield water injection development, and discloses a chemical agent for reducing pressure and increasing injection in an ultra-low permeability oilfield and a preparation method thereof. The modified groups covalently linked to the silica particles in the branched nano-silica include: a hydrophobic group represented by the structure shown in the following formula (1) and a phosphate group represented by the structure shown in the following formula (2) group; among them, R 1 and R 3 each independently for C 1 -C 5 the alkyl group, R 4 for C 1 -C 6 The alkylene group, R 5 for C 1 -C 10 the alkyl group, R 6 for C 7 -C 17 of alkyl phenyl groups. The surface of the double-grafted nano-silica prepared by the present invention is grafted with hydrophobic group-(3-alkoxysilyl)-alkyl ester, which can improve its hydrophobic performance, and graft wear-resistant group mercaptoalkane The carbonyl ethyl phosphate can improve its dispersion stability in an organic medium, so that the double-grafted nano-silica has a good pressure-lowering effect when it is applied to a pressure-reducing and increasing-injection chemical agent.

Description

technical field [0001] The present invention relates to a low-permeability oilfield pressure-reducing and increasing-injection chemical agent and a preparation method thereof, more specifically, to an ultra-low-permeability oilfield depressurizing and increasing-injection chemical agent and a preparation method thereof. Background technique [0002] With the development of oil, the proportion of my country's low-permeability oil fields is increasing, and it has become an integral part of my country's important oil resources. Most low-permeability oilfields are mainly developed by water flooding, and generally have the characteristics of small pore throats, low permeability, and large seepage resistance, resulting in high water injection displacement pressure, low injection rate, and low recovery. series of questions. At present, the surface modification method is usually used to solve the problem of high resistance of micropores in low-permeability reservoirs, that is, by i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/58
CPCC09K8/58C09K2208/10
Inventor 黄娟秦冰李财富王征王秀
Owner CHINA PETROLEUM & CHEM CORP