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Nanometer silicon dioxide, nanometer composite slick water fracturing fluid and preparation method and application of nanometer silicon dioxide and nanometer composite slick water fracturing fluid

A nano-silica and nano-composite technology, applied in chemical instruments and methods, drilling compositions, etc., can solve the problems of insufficient sand-carrying capacity, poor shear stability, single function, etc., to simplify construction procedures and investment. The effect of high cost, high drag reduction rate and simple preparation process

Active Publication Date: 2022-03-01
CHINA UNIV OF GEOSCIENCES (BEIJING) +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a nano-dioxide Silicon, nanocomposite slick water fracturing fluid, preparation method and application

Method used

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  • Nanometer silicon dioxide, nanometer composite slick water fracturing fluid and preparation method and application of nanometer silicon dioxide and nanometer composite slick water fracturing fluid
  • Nanometer silicon dioxide, nanometer composite slick water fracturing fluid and preparation method and application of nanometer silicon dioxide and nanometer composite slick water fracturing fluid

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preparation example Construction

[0021] A first aspect of the present invention provides a method for preparing nano silicon dioxide, the method comprising:

[0022] (1) In the presence of acid, carry out the first reaction with silicate, ethanol and water to obtain the intermediate product system;

[0023] (2) carry out second reaction with described intermediate product system and dicarboxypolyethylene glycol, and the product that obtains is carried out freeze-drying, obtains nano silicon dioxide.

[0024] According to the present invention, in the preparation method of described nano silica, preferably, silicate: ethanol: water: the molar ratio of dicarboxypolyethylene glycol can be (4-20): (40-100): (40-200): (1-5), more preferably 4: (40-50): (40-50): (1-3), in order to obtain nano silicon dioxide with smaller particle size, and then can be Fracturing fluid brings better seepage and oil discharge effect.

[0025] According to the present invention, in step (1), the acid is used to adjust the pH value o...

Embodiment approach

[0045] According to a preferred embodiment of the present invention, the preparation of the nano-composite slick water fracturing fluid can specifically adopt the following operations: prepare the raw materials according to the above-mentioned proportions, mix the drag reducer at a stirring rate of 500-1000 rpm Add water, stir for 1-2 minutes to fully dissolve; then add drainage aid and anti-swelling agent, continue to stir for 1-2 minutes to fully dissolve; finally add nano-silica, continue to stir for 1-2 minutes, so that the system Uniform and stable, the nanocomposite slick water fracturing fluid is prepared.

[0046] The fifth aspect of the present invention provides the application of the nanocomposite slickwater fracturing fluid described in the third aspect above in the fracturing of low-permeability tight oil layers.

[0047] The present invention will be described in detail below by way of examples. In the following preparations and examples,

[0048] The particle ...

preparation example 1

[0056] This preparation example is in order to illustrate the preparation method of the nano silicon dioxide provided by the invention

[0057] (1) Methyl silicate, ethanol and water are placed in a reaction vessel and fully stirred and mixed, then acetic acid is added to adjust the pH of the reaction system to 3, heated and carried out at 70°C for the first reaction for 6 hours to obtain an intermediate product system;

[0058] (2) Add dicarboxypolyethylene glycol 400 to the intermediate product system prepared in step (1), and continue the second reaction at 70°C for 12h to obtain a dispersion of nano-silica particles, and then Down freeze-drying 15h, obtain nano-silica powder body (recorded as P1);

[0059] Wherein, the molar ratio of methyl silicate: ethanol: water: dicarboxypolyethylene glycol 400 is 4:40:40:1.

[0060] After testing, the average particle size of P1 is 6nm.

[0061] figure 1 It is the particle size distribution diagram of nano-silica P1 prepared in Pre...

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Abstract

The invention relates to the field of oilfield chemistry, and discloses nano-silica, a nano-composite slick water fracturing fluid and a preparation method and application thereof.The preparation method of the nano-silica comprises the steps that 1, silicate ester, ethyl alcohol and water are subjected to a first reaction in the presence of acid, and an intermediate product system is obtained; and (2) carrying out a second reaction on the intermediate product system and dicarboxyl polyethylene glycol, and freeze-drying the obtained product to obtain the nano silicon dioxide. The nano-silica, a drag reducer, a discharge aiding agent, an anti-swelling agent and water are prepared into the nano-composite slickwater fracturing fluid with a specific formula, and the slickwater fracturing fluid has fracturing sand-carrying performance and imbibition oil discharge performance, and is high in drag reduction rate and excellent in temperature resistance and shear resistance.

Description

technical field [0001] The invention relates to the field of oil field chemistry, in particular to a nano-silica, nano-composite slick water fracturing fluid, a preparation method and application. Background technique [0002] At present, the main technology for developing low-permeability and tight reservoirs is horizontal staged fracturing technology, which requires a large number of fracturing stages, a large amount of slick water fracturing fluid, and a long construction period. Conventional slickwater fracturing fluid has problems such as low viscosity, poor shear stability, poor sand-carrying ability, and insufficient support for fractures, and has a single function, which makes it difficult to effectively support the fractures generated after fracturing, and the conductivity decreases. The transformation effect is not ideal. [0003] Therefore, it is of great significance to develop a slickwater fracturing fluid with shear resistance, high sand-carrying performance...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/66C09K8/68C09K8/84C09K8/88
CPCC09K8/665C09K8/68C09K8/845C09K8/88C09K2208/10
Inventor 由庆戴彩丽肖良飞王磐刘成胡宇航李玉阳刘逸飞高明伟
Owner CHINA UNIV OF GEOSCIENCES (BEIJING)
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