High-temperature-resistant modified titanium dioxide crosslinking agent for cracking liquid and preparation method thereof

A technology of nano-titanium dioxide and cross-linking agent, applied in the direction of titanium dioxide, chemical instruments and methods, titanium oxide/hydroxide, etc., can solve the problems of being unable to adapt to fracturing construction, etc., and achieve simple and reliable experimental methods, good temperature resistance and shear resistance cutting performance, the effect of tight three-dimensional network structure

Pending Publication Date: 2019-10-15
SOUTHWEST PETROLEUM UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In view of the fact that most organic boron cross-linking systems are difficult to withstand the formation temperature above 120°C and cannot adapt to the needs of higher temperature deep well fracturing construction, the present invention is based on the hydroxypropyl guaridine fracturing fluid system widely used in oil fields at present, Utilizing the characteristics of the organic titanium crosslinking system that can withstand the high temperature of the formation, combined with the excellent performance of the application of nanoparticles in the fracturing fluid fluid to improve the stability and viscosity of the system, a modified nano-titanium dioxide crosslinking system for high temperature resistant fracturing fluid was prepared. agent, the temperature resistance of the system reaches 170°C

Method used

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  • High-temperature-resistant modified titanium dioxide crosslinking agent for cracking liquid and preparation method thereof
  • High-temperature-resistant modified titanium dioxide crosslinking agent for cracking liquid and preparation method thereof
  • High-temperature-resistant modified titanium dioxide crosslinking agent for cracking liquid and preparation method thereof

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Effect test

Embodiment 1

[0028] A method for preparing a high-temperature-resistant modified nano-titanium dioxide crosslinking agent for fracturing fluid, comprising the following steps:

[0029] (1) Preparation of nano-titanium dioxide: adjust the pH value of the alcohol to 2-4 with hydrochloric acid, then slowly add an inorganic titanium source to the alcohol solution, and stir for 15 minutes; react the mixed solution at 70°C for 60 minutes to obtain a white suspension; Wash the obtained white suspension with ether, centrifuge the solution, take the white solid and disperse it in a mixed solution of deionized water and ethanol to obtain a nano-titanium dioxide dispersion;

[0030] Wherein, the mass ratio of the alcohol to the inorganic titanium source is 85:15; the alcohol is ethanol; the inorganic titanium source is titanium tetrachloride;

[0031] (2) Preparation of modified nano-titanium dioxide cross-linking agent: adding an organic ligand with a mass fraction of 20% to the prepared nano-titani...

Embodiment 2

[0033] A method for preparing a high-temperature-resistant modified nano-titanium dioxide crosslinking agent for fracturing fluid, comprising the following steps:

[0034] (1) Preparation of nano-titanium dioxide: adjust the pH value of the alcohol to 2-4 with hydrochloric acid, then slowly add an inorganic titanium source to the alcohol solution, and stir for 15 minutes; react the mixed solution at 90°C for 50 minutes to obtain a white suspension; Wash the obtained white suspension with ether, centrifuge the solution, take the white solid and disperse it in a mixed solution of deionized water and ethanol to obtain a nano-titanium dioxide dispersion;

[0035] Wherein, the mass ratio of the alcohol to the inorganic titanium source is 90:10; the alcohol is benzyl alcohol; the inorganic titanium source is butyl titanate;

[0036] (2) Preparation of modified nano-titanium dioxide crosslinking agent: adding an organic ligand with a mass fraction of 25% to the prepared nano-titanium...

Embodiment 3

[0038] A method for preparing a high-temperature-resistant modified nano-titanium dioxide crosslinking agent for fracturing fluid, comprising the following steps:

[0039] (1) Preparation of nano-titanium dioxide: adjust the pH value of the alcohol to 2-4 with hydrochloric acid, then slowly add an inorganic titanium source to the alcohol solution, and stir for 15 minutes; react the mixed solution at 80°C for 80 minutes to obtain a white suspension; Wash the obtained white suspension with ether, centrifuge the solution, take the white solid and disperse it in a mixed solution of deionized water and ethanol to obtain a nano-titanium dioxide dispersion;

[0040] Wherein, the mass ratio of the alcohol to the inorganic titanium source is 88:12; the alcohol is glycerol; the inorganic titanium source is isopropyl titanate;

[0041] (2) Preparation of modified nano-titanium dioxide crosslinking agent: adding an organic ligand with a mass fraction of 22% to the prepared nano-titanium d...

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Abstract

A preparation method of a high-temperature-resistant modified titanium dioxide crosslinking agent comprises the following steps: (1) adjusting the pH of alcohol to be 2-4 through hydrochloric acid; adding an inorganic titanium source to the alcohol solution; carrying out a reaction for 60 min to obtain nanometer titanium dioxide liquid; (2) washing the nanometer titanium dioxide liquid through ethyl alcohol; centrifuging solution; dispersing white solid into deionized water and ethyl alcohol; (3) adding an organic ligand to the dispersed nanometer titanium dioxide liquid; carrying out a reaction; adjusting the pH to be 6-9 to obtain the modified nanometer titanium dioxide crosslinking agent. With the adoption of the modified titanium dioxide crosslinking agent prepared according to the method, the temperature and shearing resistance of a cracking liquid system can be improved; cracking liquid jelly is high in viscoelasticity.

Description

technical field [0001] The invention belongs to the technical field of fracturing in petroleum development, and in particular relates to a high-temperature-resistant modified nano-titanium dioxide crosslinking agent for fracturing fluid and a preparation method thereof. Background technique [0002] In recent decades, with the development of exploration and development technology, most of my country's shallow oil and gas resources have been developed, while deep oil and gas resources are still relatively rich, of which oil accounts for about 30% and natural gas accounts for about 60%. With the rapid increase in the number of high-temperature deep wells with a depth of more than 4,500 meters and a downhole temperature of 150°C or higher, development technologies such as drilling and completion are facing more difficult challenges, and higher requirements are also placed on fracturing technology. As the main component of fracturing fluid, cross-linking agent directly affects t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/68C01G23/047
CPCC01G23/08C09K8/665C09K8/685C09K8/885C09K8/887C09K2208/10
Inventor 陈馥何坤忆贺杰罗米娜廖子涵王婉露李环王坤泰
Owner SOUTHWEST PETROLEUM UNIV
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