Application of modified chitosan as shale inhibitor and application of temperature-resistant and environmentally friendly water-based drilling fluid

A technology of shale inhibitor and chitosan, which is applied in the direction of drilling compositions, chemical instruments and methods, etc., can solve the problems that it is difficult to have both inhibitory effect and temperature resistance, and achieve excellent inhibitory effect and high inhibitory effect , Inhibit the effect of hydration dispersion

Active Publication Date: 2017-11-14
CHINA UNIV OF PETROLEUM (BEIJING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The object of the present invention is to overcome the defect that existing shale inhibitors are difficult to have good inhibitory effect and temperature resistance, and provide a kind of environmentally friendly modified chitosan with good inhibitory effect and temperature resistance as Application of shale inhibitor and application of temperature-resistant and environment-friendly water-based drilling fluid

Method used

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  • Application of modified chitosan as shale inhibitor and application of temperature-resistant and environmentally friendly water-based drilling fluid
  • Application of modified chitosan as shale inhibitor and application of temperature-resistant and environmentally friendly water-based drilling fluid

Examples

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preparation example Construction

[0033] Above-mentioned modified chitosan can be commercially available, also can adopt this area conventional method to make, preferably, the preparation method of described modified chitosan comprises:

[0034] (1) in the presence of an alkaline compound, in a solvent, the chitosan is alkalized;

[0035] (2) performing a quaternization reaction with the ammonium salt providing the modifying group on the alkalized product.

[0036] In the preparation method of above-mentioned modified chitosan, in step (1), chitosan is carried out alkalization treatment, can make chitosan more easily dissociate the ammonium root group, thereby can carry out all in step (2) The quaternization reaction described above. Wherein, the basic compound can adopt the conventional compounds in the art capable of alkalizing chitosan, such as sodium methylate, potassium methylate, sodium ethylate, potassium ethylate, sodium tert-butoxide, sodium hydroxide, hydroxide One or more of potassium and lithium ...

preparation example 1

[0069] This preparation example is used to illustrate the modified chitosan of the present invention and its preparation method.

[0070] (1) The chitosan of 100g (purchased from Huantai County Taili Chemical Co., Ltd., the number average molecular weight is 45000, the same below) is dissolved in 900g of isopropanol, and then an aqueous solution of sodium hydroxide is added (the concentration of the aqueous solution is 60 % by weight, in an amount such that the amount of sodium hydroxide added is 4g), and alkalized at 55°C for 4h;

[0071] (2) Continue to add an aqueous solution of 3-chloro-2 hydroxypropyl trimethyl ammonium chloride (the concentration of the aqueous solution is 65% by weight, and the amount of 3-chloro- The addition amount of 2 hydroxypropyltrimethylammonium chloride is 100g), and stirring and mixing for 30min; then carry out quaternization reaction at 70°C for 4h;

[0072] (3) Cool the product after the above quaternization reaction to room temperature, and...

preparation example 2

[0075] This preparation example is used to illustrate the modified chitosan of the present invention and its preparation method.

[0076] (1) The chitosan of 100g is dissolved in the propanol of 1100g, then adds sodium hydroxide aqueous solution (this aqueous solution concentration is 60% by weight, consumption makes the add-on of sodium hydroxide be 4g), and at 60 DEG C chemical treatment for 3.5h;

[0077] (2) Continue to add an aqueous solution of glycidyltrimethylammonium chloride to the system after the above-mentioned alkalization treatment at 60°C (the concentration of the aqueous solution is 65% by weight, and the consumption is such that glycidyltrimethylchloride The addition amount of ammonium chloride is 110g), and stirring and mixing for 30min; then carry out quaternization reaction at 75°C for 5h;

[0078] (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...

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Abstract

The invention relates to the field of well drilling in petroleum industry, and particularly relates to an application of modified chitosan as a shale inhibitor and an application of an anti-temperature and environment-friendly water-based drilling fluid. The modified chitosan has a modifying group represented as the formula (1). The modified chitosan is applied in oil and gas drilling as the shale inhibitor, especially, shale gas well drilling, thereby achieving excellent inhibition effects. The modified chitosan has excellent temperature resistance, so that a high inhibition effect can be maintained even at a high temperature for a long time. The modified chitosan also has the biodegradability of chitosan and belongs to environment-friendly shale inhibitors.

Description

technical field [0001] The invention relates to the drilling field of the petroleum industry, in particular to the application of a modified chitosan as a shale inhibitor and the application of a temperature-resistant and environment-friendly water-based drilling fluid. 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-base...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/035C09K8/20C08B37/08
CPCC08B37/003C09K8/035C09K8/206C09K2208/12
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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