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Preparation method for silicon dioxide aerogel microsphere coated ammonium persulfate delaying gel-breaking agent

A technology of ammonium persulfate and silicon dioxide, applied in chemical instruments and methods, drilling composition and other directions, can solve the problems of fracturing construction failure, complex environment, melting and rupture of polymer capsule shells, etc., to improve stability and safety, the effect of solving poor heat resistance

Inactive Publication Date: 2017-10-31
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the internal environment of the formation is complex, and the downhole temperature can generally reach above 150 degrees Celsius, which poses a big challenge to the stability of polymer materials.
The complex downhole environment may melt and rupture the shell of the polymer capsule, causing ammonium persulfate to be released in advance, resulting in the failure of fracturing operations

Method used

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  • Preparation method for silicon dioxide aerogel microsphere coated ammonium persulfate delaying gel-breaking agent
  • Preparation method for silicon dioxide aerogel microsphere coated ammonium persulfate delaying gel-breaking agent
  • Preparation method for silicon dioxide aerogel microsphere coated ammonium persulfate delaying gel-breaking agent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Add tetraethyl orthosilicate (TEOS) and ethanol into the beaker at a molar ratio of 1:1.04, then add 5.4ml of deionized water and 0.0242ml of concentrated nitric acid, and mix under magnetic stirring conditions. After the mixture is clarified, add 1.5 g ammonium persulfate, and continue to stir and hydrolyze for 24h.

[0025] Measure 70ml of edible oil with a measuring cylinder, and add 80 to 75ml of Span (70ml of oil phase + 5ml of surfactant) into the measuring cylinder, pour it into a beaker equipped with a magnetic rotor, and stir with a mixer until uniform. After stirring evenly, slowly add the hydrolyzate, set the stirring speed to 650r / min, and stir until uniform. Reduce the rotational speed, slowly add 2ml of ammonia water to adjust the pH, and maintain stirring for a period of time under the condition of a stirring speed of 700r / min. After stirring evenly, cover the mouth of the beaker with plastic wrap and let stand for 8h.

[0026] Use n-hexane as a cleanin...

Embodiment 2

[0031] Add tetraethyl orthosilicate (TEOS) and ethanol into the beaker at a molar ratio of 1:1.04, then add 5.4ml of deionized water and 0.0242ml of concentrated nitric acid, mix under magnetic stirring conditions, and add 1.0ml after the mixture is clarified g ammonium persulfate, and continue to stir and hydrolyze for 24h.

[0032] Measure 70ml of edible oil with a measuring cylinder, and add 80 to 75ml of Span (70ml of oil phase + 5ml of surfactant) into the measuring cylinder, pour it into a beaker equipped with a magnetic rotor, and stir with a mixer until uniform. After stirring evenly, slowly add the hydrolyzate, set the stirring speed to 650r / min, and stir until uniform. Reduce the rotational speed, slowly add 2ml of ammonia water to adjust the pH, and maintain stirring for a period of time under the condition of a stirring speed of 700r / min. After stirring evenly, cover the mouth of the beaker with plastic wrap and let stand for 8h.

[0033] Use n-hexane as a cleani...

Embodiment 3

[0035] Add tetraethyl orthosilicate (TEOS) and ethanol into the beaker at a molar ratio of 1:1.04, then add 5.4ml of deionized water and 0.0242ml of concentrated nitric acid, and mix under magnetic stirring conditions. After the mixture is clarified, add 0.5 g ammonium persulfate, and continue to stir and hydrolyze for 24h.

[0036] Measure 70ml of edible oil with a measuring cylinder, and add 80 to 75ml of Span (70ml of oil phase + 5ml of surfactant) into the measuring cylinder, pour it into a beaker equipped with a magnetic rotor, and stir with a mixer until uniform. After stirring evenly, slowly add the hydrolyzate, set the stirring speed to 650r / min, and stir until uniform. Reduce the rotation speed, slowly add 2ml drops of ammonia water to adjust the pH, and keep stirring for a period of time under the condition of stirring speed of 700r / min. After stirring evenly, cover the mouth of the beaker with plastic wrap and let stand for 8h.

[0037] Use n-hexane as a cleaning ...

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Abstract

The invention provides a preparation method of ammonium persulfate delayed breaker coated with silica airgel microspheres, by using silica airgel instead of polymer material as the coating material of ammonium persulfate, It solves the defect of poor heat resistance of polymer materials, realizes the delayed release of the breaker, improves the stability and safety of the ammonium persulfate breaker in fracturing construction, prolongs the operation time, and ensures The crack construction can be carried out safely and smoothly.

Description

technical field [0001] The invention relates to the technical field of fracturing fluid breakers in oilfield exploitation, in particular to a preparation method of a time-delay breaker. Background technique [0002] In drilling engineering, hydraulic fracturing is an important technical measure to increase production in oil and gas fields. The general process of hydraulic fracturing is to use the high-pressure pump group on the ground to inject high-viscosity liquid into the well with a displacement that greatly exceeds the absorption capacity of the formation by using its pressure transmission performance. When the pressure increases to exceed the in-situ stress near the well wall, A certain geometric fracture will appear in the oil layer. As the high-viscosity liquid carrying a certain proppant continues to be injected into the well, the fracture will gradually extend and widen, and finally a sand-filled fracture with a certain length, width and height will be formed in th...

Claims

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Application Information

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IPC IPC(8): C09K8/70
CPCC09K8/706C09K2208/26
Inventor 陈晓红雷尧飞宋怀河巩阳
Owner BEIJING UNIV OF CHEM TECH
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