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Drag reducer, preparation method of drag reducer, slickwater fracturing fluid and application

A drag reducing agent and water fracturing technology, applied in the field of fracturing fluid, can solve the problems of polymer chain shear failure, drag reduction rate less than 50%, poor shear resistance effect, etc., to reduce surface tension and improve lubrication. Wet, easy flowback effect

Active Publication Date: 2021-08-03
CHINA UNIV OF PETROLEUM (EAST CHINA) +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the research on slick water fracturing fluid mainly lies in the optimization of drag reducer. Take the emulsion type polyacrylamide drag reducer which is easy to mix as an example. Although the dissolution rate is fast, the shear resistance effect is poor. Under continuous shearing for 20 minutes, the drag reduction rate drops from 75% to below 60%
Conventional powder-type pure polyacrylamide drag reduction agent can achieve a drag reduction rate of 70% or even more than 75% at high displacement, but the temperature resistance effect is poor, and the polymer chain is severely sheared when it exceeds 90°C. Resistivity less than 50%
At present, the slick water fracturing fluid is limited by factors such as drag reduction effect, temperature resistance and shear resistance, and there is no relatively mature slick water fracturing fluid that can take into account both drag reduction and temperature resistance and shear resistance.

Method used

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  • Drag reducer, preparation method of drag reducer, slickwater fracturing fluid and application
  • Drag reducer, preparation method of drag reducer, slickwater fracturing fluid and application
  • Drag reducer, preparation method of drag reducer, slickwater fracturing fluid and application

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preparation example Construction

[0044] The second aspect of the present invention provides a method for preparing the aforementioned drag reducer, wherein the preparation method includes:

[0045](1) In the presence of a solvent, contact the nano silicon dioxide with a silane coupling agent with a double bond to carry out the first reaction to obtain modified nano silicon dioxide;

[0046] (2) In the presence of nitrogen and initiator, contact the acrylamide shown in the modified nano-silica, co-dispersant, formula (4) and water for the second reaction, and wash the obtained reaction product , vacuum drying and grinding to obtain the drag reducer;

[0047]

[0048] Wherein, the silane coupling agent with a double bond has a monomer shown in formula (5) or formula (6):

[0049]

[0050] Among them, X 1 selected from -Cl and / or -CH 3 ;

[0051] Among them, X 2 selected from -Cl, -CH 3 、-CH 2 CH 3 and -CH 2 CH 2 OCH 3 one or more of.

[0052] According to the present invention, in step (1), th...

Embodiment 1

[0082] This example is to illustrate the drag reducer prepared by the method of the present invention.

[0083] (1) Dissolve 2.5 g of dried nano silicon dioxide with a particle size of 10-20 nm in 85 g of absolute ethanol, stir and disperse at room temperature for 12 hours to obtain a first mixed solution. Another 0.525g of silane coupling agent γ-methacryloxytrimethoxysilane KH-570 was dissolved in 72.5g of absolute ethanol as a solvent, and stirred at a stirring rate of 375r / min at a temperature of 25°C To clarification, the second mixed solution was obtained. Mix the first mixed solution and the second mixed solution to obtain a mixed solution, adjust the pH of the mixed solution to 3.75 with 1mol / L oxalic acid, place the mixed solution in an oil bath at 75°C and stir for 3.75 hours; Rotary evaporation at ℃, washing with absolute ethanol for 3-4 times, and vacuum drying at 95℃ for 30 hours to obtain KH-570 modified nano-silica;

[0084] (2) Add 2.5 g of auxiliary dispersant...

Embodiment 2

[0089] This example is to illustrate the drag reducer prepared by the method of the present invention.

[0090] (1) Dissolving 2 g of dried nano-silica with a particle size of 10-20 nm in 80 g of absolute ethanol, stirring and dispersing at room temperature for 12 hours, to obtain a first mixed solution. Another 0.05g of silane coupling agent vinyltriethoxysilane was dissolved in 70g of solvent absolute ethanol, and stirred at a temperature of 25°C and a stirring rate of 350r / min until clear to obtain a second mixed solution . Mix the first mixed solution and the second mixed solution to obtain a mixed solution, adjust the pH of the mixed solution to 4 with 1mol / L oxalic acid, place the mixed solution in an oil bath at 80°C and stir for 4 hours; and put the reaction product at 60°C Rotary evaporation under the conditions, washing with absolute ethanol for 3-4 times, and vacuum drying at a temperature of 90°C for 24 hours to obtain vinyltriethoxysilane-modified nano-silica;

...

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Abstract

The invention relates to the technical field of fracturing fluids, and discloses a drag reducer and a preparation method thereof as well as a slickwater fracturing fluid and application. The drag reducer contains a structural unit as shown in a formula (1) and a structural unit as shown in a formula (2) or a formula (3), m ranges from 20000 to 28000, n1 ranges from 90 to 130, and n2 ranges from 50 to 80; and the weight-average molecular weight of the drag reducer is 1.5 million to 2 million. The slickwater fracturing fluid has good temperature resistance and shear resistance, and has a better drag reduction effect.

Description

technical field [0001] The invention relates to the technical field of fracturing fluid, in particular to a drag reducer, a preparation method thereof, a slick water fracturing fluid and its application. Background technique [0002] As an efficient energy source, petroleum plays an important role in the development of the national economy. Ultra-low permeability and tight oil reservoirs have complex pore structure, poor reservoir physical properties, mostly micro-nano pore throats, difficult production of matrix reserves, low recovery of conventional water flooding development, most oilfields adopt Split way development. [0003] The choice of fracturing fluid often depends on the nature of the reservoir. The water-based fracturing fluid systems commonly used in oilfields mainly include water-based gel fracturing fluid, guar gum fracturing fluid, and slick water fracturing fluid. Slippery water fracturing fluid is widely used in the development of unconventional oil and g...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F220/56C08F230/08C09K8/66C09K8/68C09K8/84C09K8/88
CPCC08F220/56C09K8/665C09K8/68C09K8/845C09K8/882C09K2208/10C09K2208/28C08F230/085
Inventor 赵明伟戴彩丽刘合宋旭光吴一宁赵光由庆余维初王欣
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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