Dialkyl urea type supramolecular thickening agent and preparation method and application thereof

A dialkyl urea and thickener technology, which is applied in the preparation of urea derivatives, chemical instruments and methods, and the preparation of organic compounds, etc., can solve the problem of long cross-linking time, impossibility, and limited reservoir sensitivity applications, etc. problems, achieve the effect of no need for post-pressing treatment, anti-settling, and excellent shear recovery

Inactive Publication Date: 2020-10-27
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, its disadvantages are also very obvious, that is, the cross-linking time is long, and a gel breaker needs to be added to break the gel after pressing, and it cannot be completely anhydrous
This limits its application in unconventional oil and gas reservoirs with strong reservoir sensitivity and poor reservoir physical properties

Method used

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  • Dialkyl urea type supramolecular thickening agent and preparation method and application thereof
  • Dialkyl urea type supramolecular thickening agent and preparation method and application thereof
  • Dialkyl urea type supramolecular thickening agent and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0064] 2,4-toluene diisocyanate (TDI-100) and 2-ethylhexylamine are reactants, and the reaction molar ratio of 2,4-toluene diisocyanate and 2-ethylhexylamine is 1:2.05. Dissolve in 100mL dichloromethane respectively, slowly add the two into a three-necked flask under magnetic stirring and nitrogen protection, react at room temperature for 2h, distill off the solvent dichloromethane to obtain a paste-like crude product of dialkylurea. The crude product was recrystallized 2-3 times with ethyl acetate as a solvent, and the obtained crystallized product was placed in a vacuum drying oven and dried at 65°C for 12 hours to obtain a white waxy solid, which was the target product dialkylurea thickened The oxidizing agent 2,4-dialkylureidotoluene (2,4-bis(N'-alkylureido)toluene) is referred to as EHUT-100.

[0065] The reaction scheme is as follows:

[0066]

[0067] The obtained 2,4-dialkylureidotoluene as figure 1 As shown, 2,4-dialkylureidotoluene is a white waxy solid.

[006...

Embodiment 2

[0070] Compared with Example 1, the difference is that the molar ratio of 2,4-toluene diisocyanate to 2-ethylhexylamine is 1:1.95.

Embodiment 3

[0072] Compared with Example 1, the difference is that the molar ratio of 2,4-toluene diisocyanate to 2-ethylhexylamine is 1:2.

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Abstract

The invention relates to a dialkyl urea type supramolecular thickening agent and a preparation method and application thereof. The preparation method comprises the following steps of: taking diisocyanate and alkylamine as reaction materials, carrying out an addition reaction to obtain a dialkyl urea thickening agent, wherein the alkylamine is 2-ethylhexylamine; and diisocyanate is 2, 4-toluene diisocynate or 2, 4 / 2, 6-toluene diisocynate. The thickening agent has good thickening performance on various alkanes, supramolecular aggregates can be formed in a non-polar solvent through intermolecular hydrogen bonds, and the supramolecular aggregates are further entangled to form a spatial network structure. Compared with the traditional cross-linking type fracturing fluid, the supramolecular hydrocarbon fracturing fluid prepared from the thickening agent does not need crosslinking, has excellent shear restorability and good sand carrying performance, can quickly break gel when mixed with stratum crude oil without adding a gel breaker, has the characteristics of short gel breaking time and no residue, and is particularly suitable for fracturing construction of low-permeability compact unconventional oil and gas reservoirs with serious water sensitivity.

Description

technical field [0001] The invention belongs to the technical field of hydrocarbon-based fracturing fluid thickeners, and in particular relates to a dialkylurea-type supramolecular thickener and its preparation method and application. Background technique [0002] The information disclosed in this background section is only intended to increase the understanding of the general background of the present invention, and is not necessarily taken as an acknowledgment or any form of suggestion that the information constitutes the prior art already known to those skilled in the art. [0003] Hydraulic fracturing fluid is widely used in various countries due to its advantages of strong adaptability, low cost, and good sand-carrying performance. However, for unconventional oil and gas reservoirs with poor reservoir properties, the use of water-based fracturing fluid can easily cause clay swelling. , water phase traps and other reservoir damage phenomena, in addition to water waste an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/68C09K8/86C07C275/28C07C273/18E21B43/26
CPCC09K8/68C09K8/86C07C273/1827C07C275/28E21B43/26
Inventor 张进恒范海明王其伟公证魏志毅杨玉辉杨红斌康万利
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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