Neopentane beta-cyclodextrin hydroxypropyl tetraether and preparation method and application thereof

A technology of hydroxypropyl tetraether and pentapentyl, which is applied in the field of pentapentyl β-cyclodextrin hydroxypropyl tetraether and its preparation, can solve the problems of poor temperature resistance, acrylamide toxicity, and loss of filtration. In order to solve problems such as poor effect, it can achieve the effect of good high temperature resistance, stable rheological properties, and excellent loss reduction.

Inactive Publication Date: 2017-08-04
JILIN INST OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0002] Drilling fluid refers to the general term for various circulating fluids that meet the needs of drilling work with its various functions during the oil and gas drilling process. Drilling fluid can ensure the lubrication of the drill bit, export heat, and prevent the wall from , the water in the drilling fluid will enter the formation, and the clay in the drilling fluid will adhere to the well wall to form a filter cake. Especially under high temperature conditions, the water loss will increase significantly, and the direct consequence is that the drilling fluid will solidify, Uneven surface film distribution and poor wellbore stability
[0003] Adding fluid loss control agent can prevent the water in the drilling fluid from entering the formation and stabilize the well wall. Currently, the most commonly used fluid loss control agent in this field is polyacrylamide compound. It has the advantages of mature technology and low price, but the degradation of polyacrylamide compounds will produce acrylamide, which has certain toxicity and will pollute the formation
Other fluid loss reducers that can be used, such as humic acid and starch, do not cause environmental pollution, but have poor filter loss reduction effects, are easily degraded at high temperatures, and have poor temperature resistance

Method used

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  • Neopentane beta-cyclodextrin hydroxypropyl tetraether and preparation method and application thereof
  • Neopentane beta-cyclodextrin hydroxypropyl tetraether and preparation method and application thereof
  • Neopentane beta-cyclodextrin hydroxypropyl tetraether and preparation method and application thereof

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[0028] The present invention provides the preparation method of pentapentyl β-cyclodextrin hydroxypropyl tetraether described in the above scheme, comprising the following steps:

[0029] Pentaerythritol and epichlorohydrin are subjected to Wilson reaction under alkaline conditions to obtain pentaerythritol oxypropylene ether;

[0030] The pentaerythroxypropylene oxide ether and β-cyclodextrin are subjected to ring-opening reaction under alkaline conditions to obtain pentapentyl β-cyclodextrin hydroxypropyl tetraether.

[0031] In the invention, pentaerythritol and epichlorohydrin are subjected to Wilson reaction under alkaline conditions to obtain pentaerythritol epoxypropane ether. In the present invention, the molar ratio of pentaerythritol to epichlorohydrin is preferably 1:4.0-4.4, more preferably 1:4.1-4.2.

[0032] In the present invention, the temperature of the Wilson reaction is preferably 3-8°C, more preferably 4-6°C, most preferably 5°C; the time of the Wilson rea...

Embodiment 1

[0044] Dissolve 2.5g of potassium hydroxide in 25ml of deionized water, stir to dissolve fully, add 1.4g of pentaerythritol, heat to 90°C with stirring, react for 2h, then cool to 5°C, add 3.2ml of epichlorohydrin, React at 5°C for 10h (reaction pH is 12), after the reaction is completed, add 48g of β-cyclodextrin and 150ml of sodium hydroxide solution (concentration: 0.033g / ml) to the reaction solution, stir evenly and heat up to 35°C for 24h (The reaction pH is 8.5), after the reaction is completed, the resulting mixed solution is rotary evaporated to about 50 ml to obtain a concentrate, which is washed with 300 ml of acetone, filtered and dried at 45°C for 24 hours to obtain pentapentyl β - Cyclodextrin hydroxypropyl tetraether 46.5 g.

[0045] The structure of β-cyclodextrin and the obtained pentapentyl β-cyclodextrin hydroxypropyl tetraether is analyzed by nuclear magnetic resonance method, and the obtained 1 HNMR spectrum such as Figure 1~2 shown; where figure 1 for ...

Embodiment 2

[0047] Dissolve 2.5g of potassium hydroxide in 15ml of deionized water, stir well to dissolve, add 1.4g of pentaerythritol, heat to 95°C with stirring, react for 1h (reaction pH is 13.5), then cool to 5°C, add 3.78ml Epichlorohydrin, react at 5°C for 8h, after the reaction is completed, add 45g of β-cyclodextrin and 150ml of sodium hydroxide solution (concentration: 0.034g / ml) to the reaction solution, stir evenly and then heat up to 30°C for 22h (The reaction pH is 9.3), after the reaction is completed, the resulting mixed solution is rotary evaporated to about 50 ml to obtain a concentrate, which is washed with 300 ml of acetone, filtered and dried at 45°C for 24 hours to obtain pentapentyl β - Cyclodextrin hydroxypropyl tetraether 45.2 g.

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Abstract

The invention provides neopentane beta-cyclodextrin hydroxypropyl tetraether and a preparation method and application thereof. The neopentane beta-cyclodextrin hydroxypropyl tetraether is a tetrapod compound, structurally comprises four beta-cyclodextrin groups, is high in beta-cyclodextrin group cavity proportion, can form a supermolecule clathrate compound with polymer or surfactant in drilling fluid, is high in high temperature resistance, good in salt resistance and stable in rheological property, can have an excellent filter loss lowering effect under the downhole high temperature condition and is promising in application prospect.

Description

technical field [0001] The invention relates to the technical field of petroleum drilling, in particular to a pentapentyl beta-cyclodextrin hydroxypropyl tetraether and a preparation method and application thereof. Background technique [0002] Drilling fluid refers to the general term for various circulating fluids that meet the needs of drilling work with its multiple functions during the oil and gas drilling process. Drilling fluid can ensure the lubrication of the drill bit, export heat, and prevent the well wall from , the water in the drilling fluid will enter the formation, and the clay in the drilling fluid will adhere to the well wall to form a filter cake. Especially under high temperature conditions, the water loss will increase significantly, and the direct consequence is that the drilling fluid will solidify, Uneven surface film distribution and poor wellbore stability. [0003] Adding fluid loss reducer can prevent the water in the drilling fluid from entering...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08B37/16C09K8/035
CPCC08B37/0012C09K8/035
Inventor 谭乃迪陈哲丁元生穆东昭张延林邹长军
Owner JILIN INST OF CHEM TECH
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