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Preparation of low molecular plant gum

A vegetable glue, low molecular technology, applied in chemical instruments and methods, drilling composition, natural resin technology, etc. The effect of saving water and chemical additives, shortening construction time, and stabilizing rheological properties

Inactive Publication Date: 2009-07-08
QINGYANG CHANGQING DOWN HOLE OILFIELD AUXILIARIESCO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] 2. Because the gel breaker must be used in the fracturing fluid, the gel breaker always reduces the viscosity of the fracturing fluid during the fracturing process, which affects the reliability of the construction
[0005] 3. The filter cake formed by the fracturing fluid in the formation and the concentrated solution around it cannot break the gel or only partially break the gel, and polymers are likely to remain in the support fractures of the formation, causing serious pollution to the support fractures
[0006] 4. After the fracturing construction is completed, the gel-breaking fluid returned to the ground cannot be reused. If it is not treated effectively, it will easily pollute the environment

Method used

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Examples

Experimental program
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preparation example Construction

[0024] A method for preparing low-molecular-weight vegetable gum, which uses a chemical degradation method to partially break the high-molecular chain of the vegetable gum, thereby reducing the molecular weight and obtaining low-molecular-weight vegetable gum;

[0025] (1) The chemical reaction weight ratio is:

[0026] 30~140 parts of water

[0027] Ethanol 200~400 parts

[0028] Vegetable gum 100 parts

[0029] Inorganic base 2~30 parts

[0030] Inorganic or organic acid 2 to 30 parts

[0031] (2) The chemical reaction process steps are:

[0032] According to the above-mentioned chemical reaction ratio, first add ethanol in a closed container with a stirrer, start the stirrer, slowly add vegetable gum and stir for three minutes, then add water in turn, and the inorganic or organic acid with a content (weight) of 30% solution, stirred and heated to 55°C, kept at a temperature of 55±5°C for 2 hours, then cooled to below 30°C, then added an inorganic alkali solution with a...

Embodiment 1

[0037] Add 200 parts of ethanol in the airtight container with agitator, start the agitator, slowly add 100 parts of hydroxypropyl guar gum powder and stir for three minutes, then add 40 parts of water successively, 8 parts of content (weight) is 30 % industrial hydrochloric acid, stirred, heated to 55°C, kept at a temperature of 55±5°C for 2 hours, cooled to below 30°C, added 2 parts of sodium hydroxide solution with a content (weight) of 40%, and stirred for 10 minutes , Centrifuge, filter, separate the solid phase from the liquid phase, dry the solid phase, and remove the water, which is low molecular weight hydroxypropyl guar gum.

Embodiment 2

[0039] Add 200 parts of ethanol in the airtight container with stirrer, start the stirrer, slowly add 100 parts of guar gum powder and stir for three minutes, then add successively 40 parts of water, 6 parts of content (weight) as 30% acetic acid solution, stirred and heated to 55°C, kept at a temperature of 55±5°C for 2 hours, cooled to below 30°C, added 2 parts of 40% potassium hydroxide solution, stirred for 10 minutes, centrifuged, filtered, and The solid phase is separated from the liquid phase, and the solid phase is dried to remove water, which is low molecular weight guar gum.

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Abstract

The invention relates to a method for preparing low-molecular vegetable gum through chain scission of macromolecular vegetable gum by a physical or chemical method. At present, a fracturing fluid used in fracturing reconstruction of an oil gas field is the fracturing fluid mainly taking macromolecules as a thickening agent, influences reliability in construction and is easy to cause pollution to environment. Through a chemical degradation method, the macromolecular vegetable gum in an ethanol and water solution has chemical reaction with inorganic alkali, inorganic acid or organic acid, so that part of a macromolecular chain of the macromolecular vegetable gum is fractured, and the low-molecular vegetable gum having molecular weight of between 10,000 and 400,000 is obtained. When the low-molecular vegetable gum is used as the fracturing fluid, return liquid can be recycled after the construction so as to save a large quantity of water resource and chemical agents; and the method effectively reduces and avoids environmental pollution caused by the emission of waste liquid.

Description

Technical field: [0001] The invention relates to a method for preparing low-molecular-weight plant-based gums by breaking chains of high-molecular-weight plant-based gums by using physical or chemical methods. Background technique: [0002] At present, the fracturing fluid used in oil and gas field fracturing reconstruction is mainly fracturing fluid with polymer as thickener, which generally has the following disadvantages: [0003] 1. Gel breakers such as peroxides and biological enzymes must be used in the fracturing fluid so that the polymers in the fracturing fluid can degrade in the formation, reduce the viscosity of the fracturing fluid, and facilitate its flow back from the formation to the ground. [0004] 2. Because the gel breaker must be used in the fracturing fluid, the gel breaker always reduces the viscosity of the fracturing fluid during the fracturing process, which affects the reliability of the construction. [0005] 3. The filter cake formed by the fract...

Claims

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Application Information

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IPC IPC(8): C09F1/00C09K8/035
Inventor 汪义发杜彪谢璇杨海燕王俊旭牛俊峰万华程芳廉玉起李强
Owner QINGYANG CHANGQING DOWN HOLE OILFIELD AUXILIARIESCO
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