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A dendritic quaternary ammonium salt shale inhibitor and its preparation method and application

A shale inhibitor and dendritic technology, applied in the field of mud shale inhibitor for drilling fluid and its preparation, can solve the problems of low temperature resistance, limited wide application, etc. Excellent performance

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

AI Technical Summary

Problems solved by technology

However, there are still many deficiencies in the existing shale inhibitors, such as: the hyperbranched polylysine disclosed in Chinese patent document CN103917623A is used as a shale inhibitor, and its temperature resistance is low, which limits its wide application

Method used

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  • A dendritic quaternary ammonium salt shale inhibitor and its preparation method and application
  • A dendritic quaternary ammonium salt shale inhibitor and its preparation method and application
  • A dendritic quaternary ammonium salt shale inhibitor and its preparation method and application

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Experimental program
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Effect test

Embodiment 1

[0045]With ethylenediamine as the initiator nucleus, methyl acrylate and ethylenediamine as the reaction raw materials, Michael addition reaction and amidation reaction are alternately carried out to obtain polyamide-amine dendrimers of different generations (PAMAM-Gn, n is Algebra), the specific synthesis steps refer to Chinese patent document CN201110073112.6.

[0046] Then polyamide-amine dendrimers of different generations react with epichlorohydrin and triethylamine to undergo quaternization to obtain modified cationic polyamide-amine dendritic quaternary ammonium salts. The synthetic route is as follows:

[0047]

[0048] In a 250mL four-neck flask with a condenser, add 100mL of anhydrous methanol as a solvent, weigh 10.0g of PAMAM-G0 and 8.0g of triethylamine and dissolve in anhydrous methanol, and stir at room temperature for 1h. After it was fully dissolved, 7.2 g of epichlorohydrin was slowly added dropwise at a rate of 20 drops / min. After the dropwise addition, ...

Embodiment 2

[0052] With ethylenediamine as the initiator nucleus and acrylonitrile as the repeating unit, the N-alkylation reaction and the reduction reaction of polynitriles are alternately repeated to obtain polypropyleneimine dendrimers of different generations (PPI-Gn, n is the generation number ), its synthesis method refers to Chinese patent documents CN201010586069.9 and 201210290336.7.

[0053] Then the polypropyleneimine dendrimers of different generations react with epichlorohydrin and trimethylamine to obtain a modified cationic polypropyleneimine dendritic quaternary ammonium salt. The synthetic route is as follows:

[0054]

[0055] In a 250mL four-necked flask with a condenser, add 100mL of anhydrous methanol as a solvent, weigh 10.0g of G1-generation PPI and 12.7g of trimethylamine, dissolve in anhydrous methanol, and stir magnetically at room temperature for 0.5h. After it was fully dissolved, 19.9 g of epichlorohydrin was slowly added dropwise at a rate of 20 drops / min...

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Abstract

The invention relates to a dendritic quaternary ammonium salt shale inhibitor and its preparation method and application. The inhibitor is a modified product obtained by quaternization reaction of an amino-terminated dendritic polymer with a cyclic ether and a tertiary amine. The preparation method comprises the following steps: dissolving the amine-terminated dendritic polymer in a dissolving solvent, then slowly adding a tertiary amine dropwise, stirring at room temperature for 0.5-3 hours, then slowly adding a cyclic ether; after the dropwise addition, the temperature is raised to 40 ~90°C, react for 2~12h; evaporate to remove the dissolving solvent, add a precipitating solvent to precipitate a solid, and dry the solid in vacuum to obtain the product. The dendritic quaternary ammonium salt shale inhibitor of the invention has excellent inhibitory performance, can effectively inhibit the hydration and dispersion of active mud shale (high content of montmorillonite), and can effectively exert the inhibitory effect at a low concentration.

Description

technical field [0001] The invention belongs to the field of petroleum engineering, and in particular relates to a mud shale inhibitor for drilling fluid, a preparation method and application thereof. Background technique [0002] Wellbore instability caused by shale hydration expansion and dispersion has always been a technical problem in oil and gas well engineering. Especially in recent years, the exploration and development of unconventional oil and gas resources such as shale gas have been strengthened, and the stability of shale wellbore has become more and more prominent. Traditional shale inhibitors can no longer meet the requirements. It is particularly urgent to develop new efficient and environmentally friendly shale inhibitors. . [0003] As one of the earliest inorganic salt inhibitors, KCl has excellent inhibitory performance, but its use concentration is high and it is easy to affect the environment. Because the hydration radius of ammonium ions is similar t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G83/00C09K8/035
CPCC08G83/004C09K8/035C09K8/885C09K2208/12
Inventor 邱正松钟汉毅赵欣黄维安张道明汤志川张馨王伟吉
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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