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A kind of nano-organic silicon film-forming hydrophobic shale surface hydration inhibitor and its preparation method and application

A technology of hydration inhibitor and nano-organosilicon, which is applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve the problems of insufficient wettability change, poor inhibition performance, poor compatibility, etc., and achieve good compatibility , low filtration performance, and the effect of reducing free energy

Active Publication Date: 2022-07-08
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Aiming at the deficiencies of the prior art, especially the deficiencies of the existing wettability-changing shale-like inhibitors such as insufficient wettability change, poor compatibility, etc., and poor inhibitory performance, the present invention provides a nano-organosilicon film-forming hydrophobic Shale surface hydration inhibitor and its preparation method and application

Method used

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  • A kind of nano-organic silicon film-forming hydrophobic shale surface hydration inhibitor and its preparation method and application
  • A kind of nano-organic silicon film-forming hydrophobic shale surface hydration inhibitor and its preparation method and application
  • A kind of nano-organic silicon film-forming hydrophobic shale surface hydration inhibitor and its preparation method and application

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Embodiment 1

[0034] A method for preparing a nano-organosilicon film-forming hydrophobic shale surface hydration inhibitor, comprising the following steps:

[0035] (1) Under the stirring condition of the stirring speed of 300 r / min, 10 g of nano-silica was added to the mixed solvent of 100 mL of water and 20 mL of ethanol, and then ultrasonically dispersed for 0.5 h at room temperature; after the ultrasonic wave was over, the obtained solution was transferred. into a three-necked flask, slowly stir at a stirring speed of 300 r / min, and use a 20% NaOH aqueous solution to adjust the pH of the system to 9 to obtain mixed solution A.

[0036] (2) 5g octyltriethoxysilane was added to 20g ethanol to prepare a long-chain organosilicon solution; then the long-chain organosilicon solution was added dropwise to the mixed solution A obtained in step (1), and the dropping time was 20min ; Then at 40°C, under the condition of stirring speed of 200r / min, react for 1h to obtain mixed solution B.

[003...

Embodiment 2

[0039] A method for preparing a nano-organosilicon film-forming hydrophobic shale surface hydration inhibitor, comprising the following steps:

[0040] (1) Under the stirring condition of the stirring speed of 300 r / min, 10 g of nano-silica was added to the mixed solvent of 100 mL of water and 20 mL of ethanol, and then ultrasonically dispersed for 0.5 h at room temperature; after the ultrasonic wave was over, the obtained solution was transferred. into a three-necked flask, slowly stir at a stirring speed of 300 r / min, and use a 20% NaOH aqueous solution to adjust the pH of the system to 9 to obtain mixed solution A.

[0041] (2) 5g of dodecyl trimethoxysilane is added to 20g of ethanol to prepare a long-chain organosilicon solution; then the long-chain organosilicon solution is slowly added dropwise to the mixed solution A obtained in step (1), and the addition time After 20 min at 60°C, the reaction was carried out for 1 h at a stirring speed of 200 r / min to obtain mixed so...

Embodiment 3

[0044] A method for preparing a nano-organosilicon film-forming hydrophobic shale surface hydration inhibitor, comprising the following steps:

[0045] (1) Under the stirring condition of the stirring speed of 300 r / min, add 10 g of nano calcium carbonate to a mixed solvent of 100 mL of water and 20 mL of ethanol, and then ultrasonically disperse at room temperature for 0.5 h; In the three-necked flask, slowly stir at a stirring speed of 300 r / min, and adjust the pH of the system to 9 with an aqueous NaOH solution with a mass fraction of 20% to obtain a mixed solution A.

[0046] (2) 5g of hexadecyltrimethoxysilane was added to 20g of ethanol to prepare a long-chain organosilicon solution; then the long-chain organosilicon solution was slowly added dropwise to the mixed solution A obtained in step (1), and the addition time for 20 min, and then at 40° C. and under the condition of a stirring speed of 200 r / min, the reaction was carried out for 1 h to obtain mixed solution B. ...

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Abstract

The present invention provides a nano-organosilicon film-forming hydrophobic shale surface hydration inhibitor and a preparation method and application thereof. The inhibitor is obtained by hydrophobically modifying nanoparticles by using long-chain organosilicon and a surfactant. . The preparation method of the above-mentioned hydrophobic shale surface hydration inhibitor includes the steps of: adding nanoparticles into a solvent under stirring conditions, and then performing ultrasonic dispersion; after the ultrasonication is completed, adjusting the pH of the system to 9-11 to obtain a mixed solution A Add the organosilicon solution dropwise to the mixed solution A, and stir to react to obtain a mixed solution B; add the surfactant to the mixed solution B, and stir to react; after the reaction is completed, remove part of the solvent to obtain. The inhibitor of the present invention is double hydrophobically modified with silicone and surfactant, and has excellent hydrophobic effect, thereby having excellent inhibitory performance, slowing rock compressive strength performance and temperature resistance performance.

Description

technical field [0001] The invention relates to a nano-organosilicon film-forming hydrophobic shale surface hydration inhibitor and a preparation method and application thereof, belonging to the field of oilfield chemistry of the petroleum industry. Background technique [0002] 75% of the strata encountered in oil and gas drilling belong to shale strata, and 90% of the wellbore instability and complexity occur in shale strata, especially hard and brittle shale strata. Mud shale is a heterogeneous body composed of clay and non-clay minerals, and clay minerals are the main components of shale. After the drilling fluid filtrate invades the formation, due to the strong sensitivity of clay minerals to fluids, the shale is easily hydrated and expanded, which weakens the strength of the shale and leads to wellbore instability. It will increase drilling costs and complex downhole accidents, affect the cementing quality, and even lead to the scrapping of the wellbore in severe case...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/03C09K8/16C09K8/22
CPCC09K8/03C09K8/16C09K8/22C09K2208/10C09K2208/12
Inventor 孙金声黄贤斌李贺吕开河刘敬平金家锋王金堂白英睿
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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