Dendritic quaternary ammonium salt shale inhibitor as well as preparation method and application thereof

A shale inhibitor and dendritic technology, which is applied in the field of mud shale inhibitor for drilling fluid and its preparation, can solve the problems of limited wide application and low temperature resistance, and achieves difficult desorption, enhanced adsorption, excellent Effects of inhibiting performance

Active Publication Date: 2017-03-22
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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  • Dendritic quaternary ammonium salt shale inhibitor as well as preparation method and application thereof
  • Dendritic quaternary ammonium salt shale inhibitor as well as preparation method and application thereof
  • Dendritic quaternary ammonium salt shale inhibitor as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
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 as well as a preparation method and application thereof. The dendritic quaternary ammonium salt shale inhibitor is a modified product obtained by quaterisation reaction of terminal amino dendritic polymer, cyclic ether and tertiary amine. The preparation method comprises the following steps: dissolving the terminal amine dendritic polymer into a dissolving solvent, then slowly dropwise adding the tertiary amine, stirring for 0.5 to 3 hours at a room temperature, and then slowly dropwise adding the cyclic ether; raising the temperature to be 40 to 90 degree centigrade after dropwise adding is finished, and reacting for 2 to 12 hours; removing the dissolving solvent through evaporation, adding a deposition solvent to deposit out a solid body, and vacuum-drying the solid body, thereby obtaining the dendritic quaternary ammonium salt shale inhibitor. The dendritic quaternary ammonium salt shale inhibitor provided by the invention has excellent inhibition performance, can effectively inhibit hydration dispersion of active clay shale (high montmorillonite content), and can effectively perform an inhibition effect under 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 Applications(China)
IPC IPC(8): C08G83/00C09K8/035
CPCC09K8/035C09K8/885C08G83/004C09K2208/12
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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