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Modified chitosan and its preparation method and its application as shale inhibitor and drilling fluid and its application

A chitosan and modification technology, applied in chemical instruments and methods, drilling compositions, etc., can solve the problem of difficulty in combining inhibition effect and temperature resistance, and achieve excellent inhibition effect, inhibition of hydration and dispersion, The effect of good temperature resistance

Active Publication Date: 2017-12-05
CHINA UNIV OF PETROLEUM (BEIJING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to overcome the defect that existing shale inhibitors are difficult to have both good inhibitory effect and temperature resistance, and provide a kind of environmentally friendly modified chitosan with good inhibitory effect and temperature resistance. Its preparation method and application as shale inhibitor and drilling fluid and application thereof

Method used

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  • Modified chitosan and its preparation method and its application as shale inhibitor and drilling fluid and its application
  • Modified chitosan and its preparation method and its application as shale inhibitor and drilling fluid and its application
  • Modified chitosan and its preparation method and its application as shale inhibitor and drilling fluid and its application

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preparation example Construction

[0041] The present invention also provides a kind of preparation method of modified chitosan, the method comprises:

[0042] (1) in the presence of an alkaline compound, in a solvent, the chitosan is alkalized;

[0043] (2) carrying out quaternization reaction with the ammonium salt of the modifying group shown in the following formula (1) to the product after the alkalization treatment,

[0044] Formula 1)

[0045] Among them, R 1 -R 3 each independently selected from C1-C8 alkyl, R 4 and R 5 each independently selected from C1-C8 alkylene groups.

[0046] According to the present invention, although the product required by the present invention that can be used as a shale inhibitor can be obtained as long as it is prepared according to the preparation method of the above-mentioned modified chitosan, especially the above-mentioned method will produce the modified chitosan described above. Polycan, that is, the modified chitosan obtained by the method has a modified gr...

Embodiment 1

[0078] This embodiment is used to illustrate modified chitosan of the present invention and preparation method thereof.

[0079] (1) The chitosan of 100g (purchased from Huantai County Taili Chemical Co., Ltd., number average molecular weight is 35000, the same below) is dissolved in the isopropanol of 1300g, then adds sodium hydroxide aqueous solution (this aqueous solution concentration is 60 % by weight, in an amount such that the amount of sodium hydroxide added is 4g), and alkalized at 60°C for 4h;

[0080] (2) Continue to add (3-(2-chloromethyl)acrylamido)propyltrimethylammonium chloride (purchased from Huantai County Taili Chemical Co., Ltd. Company, hereinafter the same) aqueous solution (this aqueous solution concentration is 65% by weight, and consumption makes (3-(2-chloromethyl) acrylamido) the add-on of propyltrimethyl ammonium chloride is 100g), and stirring mix 30min; then carry out quaternization reaction at 80°C for 4h;

[0081] (3) Cool the product after th...

Embodiment 2

[0084] This embodiment is used to illustrate modified chitosan of the present invention and preparation method thereof.

[0085] (1) The chitosan of 100g is dissolved in the propanol of 1000g, then adds sodium hydroxide aqueous solution (this aqueous solution concentration is 65% by weight, consumption makes the add-on of sodium hydroxide be 4g), and at 55 DEG C chemical treatment for 3.5h;

[0086] (2) Continue to add an aqueous solution of (3-(2-chloromethyl)acrylamido)propyltrimethylammonium chloride (the concentration of the aqueous solution is 65 wt. %, the amount makes the addition of glycidyltrimethylammonium chloride 100g), and stirred and mixed for 30min; then carried out quaternization reaction at 75°C for 5h;

[0087] (3) Cool the product after the above quaternization reaction to room temperature, and adjust the pH to 7 with hydrochloric acid; then filter with suction, wash the filter cake 3 times with propanol, and dry the filter cake in a vacuum oven at 90°C Af...

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Abstract

The invention relates to the field of drilling in the petroleum industry, in particular to modified chitosan, a preparation method thereof, application of chitosan as a shale inhibitor, drilling fluid and application thereof. The modified chitosan has a modified group shown in the formula (1). The modified chitosan is adopted as the shale inhibitor to be applied to oil gas drilling, and particularly shale gas drilling, the good inhibition effect can be obtained, the modified chitosan has the good temperature resistance and can keep the high inhibition effect under the high temperature for a long time, and the modified chitosan has the biodegradability, and can be adopted as the environmentally friendly shale inhibitor.

Description

technical field [0001] The invention relates to the field of drilling in the petroleum industry, in particular to a modified chitosan and its preparation method, its application as a shale inhibitor, drilling fluid and its application. Background technique [0002] With the improvement of human living standards, human consumption of energy is increasing day by day. The exploitation of traditional conventional energy is difficult to meet people's consumption needs. The exploration and development of unconventional resources such as shale gas is becoming more and more important. The commercial exploitation of shale gas in the United States has greatly promoted the global unconventional energy exploitation boom. Recently, China has also attached great importance to the exploitation of unconventional energy sources such as shale gas. At present, about 70% of foreign shale gas exploitation uses oil-based drilling fluid and 30% uses water-based drilling fluid, and almost all of...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08B37/08C09K8/035
CPCC08B37/003C09K8/035
Inventor 蒋官澄祁由荣葛庆颖张领宇安玉秀杨丽丽贺垠博史赫史亚伟
Owner CHINA UNIV OF PETROLEUM (BEIJING)
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