CN101475775B - Preparation of low molecular plant gum - Google Patents
Preparation of low molecular plant gum Download PDFInfo
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- CN101475775B CN101475775B CN2009100209393A CN200910020939A CN101475775B CN 101475775 B CN101475775 B CN 101475775B CN 2009100209393 A CN2009100209393 A CN 2009100209393A CN 200910020939 A CN200910020939 A CN 200910020939A CN 101475775 B CN101475775 B CN 101475775B
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- low molecular
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- molecular plant
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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:
The present invention relates to by utilizing the method for physics or chemistry, make high molecular vegetable jelly chain rupture and become the preparation method of low molecular plant gum.
Background technology:
At present, employed fracturing liquid mainly is to be the fracturing liquid of thickening material with the polymer in the oil-gas field fracturing transformation, the shortcoming that ubiquity is following:
1, in fracturing liquid, must use gel breakers such as superoxide, biological enzyme,, fracturing liquid viscosity be reduced, help it and return from the stratum and drain into ground so that the polymer in the fracturing liquid is degraded on the stratum.
2, owing to must use gel breaker in the fracturing liquid, gel breaker is reducing of the fracturing fluid viscosity all the time in fracturing process, affect the reliability of construction.
3, fracturing liquid formed filter cake and concentrated solution on every side thereof in the stratum can not break glue or have only the broken glue of part, and easy residual polymer causes serious pollution to supporting crack in the supporting crack of stratum.
4, fracturing liquid returns the breaking glue solution that drains into ground and can not use again after pressing crack construction is finished, if it is not effectively handled, easily environment is polluted.
Summary of the invention
For overcoming problems of the prior art, the object of the present invention is to provide the preparation method of a kind of molecular weight at the low molecular plant gum of 1-40 ten thousand.After the fracturing liquid that utilizes this method to make is constructed, can reduce that fracturing liquid forms filter cake on the stratum and the injury that causes, also can handle and repeat to utilize returning the liquids recovery that drains into ground as fracturing liquid.
In order to achieve the above object, the technical solution used in the present invention is: a kind of preparation method of low molecular vegetable jelly, and its special character is: adopt the degradation method of chemistry, the macromolecular chain of vegetable jelly is partly ruptured, thereby reach the reduction molecular weight, obtain low molecular plant gum;
(1) the chemical reaction weight proportion is:
30～140 parts in water
200～400 parts of ethanol
100 parts of vegetable jelly
2～30 parts of mineral alkalis
2～30 parts of inorganic or organic acids
(2) the chemical reaction process step is:
According to above-mentioned chemical reaction proportioning, at first in having the encloses container of agitator, add ethanol, start agitator, slowly adding vegetable jelly stirred after three minutes, add entry more successively, content (weight) is 30% inorganic or organic acid, be heated with stirring to 55 ℃, remain under 55 ± 5 ℃ the temperature reaction 2 hours, and be cooled to then below 30 ℃, add content (weight) again and be 30% inorganic alkali solution, stirred 10 minutes, centrifugal, filtration with solid phase and liquid phase separation, are carried out drying to solid phase, remove moisture, be low molecular plant gum;
Above-mentioned vegetable jelly refers to guar gum, fenugreek gum, sesbania gum, mushroom taro glue or contains semi-lactosi or the vegetable jelly of seminose or their chemistry, physically modified derivative, and cellulose family vegetable jelly or their chemically modified derivative;
Above-mentioned mineral alkali is meant the oxyhydroxide or the basic salt of sodium, potassium, as sodium hydroxide, potassium hydroxide, yellow soda ash, salt of wormwood, sodium bicarbonate, saleratus;
Above-mentioned inorganic or organic acid is meant the inorganic or organic acid that all kinds of energy are water-soluble, as sulfuric acid, hydrochloric acid, acetate, formic acid.
Compared with prior art, advantage of the present invention is as follows:
1, fracturing liquid need not to use gel breaker, thereby has avoided of the fracturing fluid lasting viscosity reduction in the pumping process, has highly stable rheological property.
2, after pressure break, it relies on original pH environment on stratum, and the fracturing liquid system is degraded to short molecular chain, can clean supporting crack and reduce to its injury minimum.
3, of the fracturing fluidly return discharge opeing and reclaim this, can use as fracturing liquid again, reduce the pollution of discharging of waste liquid, can save a large amount of water and chemical additive.For the arid area of insufficient water sources, water resources that not only can saves valuable also can effectively shorten the construction operation time.
Embodiment:
A kind of preparation method of low molecular vegetable jelly, the degradation method that it adopts chemistry partly ruptures the macromolecular chain of vegetable jelly, thereby reaches the reduction molecular weight, obtains low molecular plant gum;
(1) the chemical reaction weight proportion is:
30～140 parts in water
200～400 parts of ethanol
100 parts of vegetable jelly
2～30 parts of mineral alkalis
2～30 parts of inorganic or organic acids
(2) the chemical reaction process step is:
According to above-mentioned chemical reaction proportioning, at first in having the encloses container of agitator, add ethanol, start agitator, slowly adding vegetable jelly stirred after three minutes, add entry, content (weight) more successively and be 30% inorganic or organic acid soln, be heated with stirring to 55 ℃, remain under 55 ± 5 ℃ the temperature reaction 2 hours, and be cooled to then below 30 ℃, add content (weight) again and be 30% inorganic alkali solution, stirred 10 minutes, centrifugal, filtration with solid phase and liquid phase separation, are carried out drying to solid phase, remove moisture, be low molecular plant gum;
Above-mentioned vegetable jelly refers to guar gum, fenugreek gum, sesbania gum, mushroom taro glue or contains semi-lactosi or the vegetable jelly of seminose or their chemistry, physically modified derivative, and cellulose family vegetable jelly or their chemically modified derivative;
Above-mentioned mineral alkali is meant the oxyhydroxide or the basic salt of sodium, potassium, as sodium hydroxide, potassium hydroxide, yellow soda ash, salt of wormwood, sodium bicarbonate, saleratus;
Above-mentioned inorganic or organic acid is meant the inorganic or organic acid that all kinds of energy are water-soluble, as sulfuric acid, hydrochloric acid, acetate, formic acid.
Embodiment 1:
In the encloses container of belt stirrer, add 200 parts of ethanol, start agitator, stirred three minutes behind the hydroxypropyl guar rubber powder that slow adding is 100 parts, water, the 8 parts of content (weight) that add 40 parts then successively are 30% technical hydrochloric acid, stir, be heated to 55 ℃, remained under 55 ± 5 ℃ the temperature reaction 2 hours, be cooled to below 30 ℃, add 2 parts of content (weight) and be 40% sodium hydroxide solution, stirred 10 minutes, centrifugal, filter, with solid phase and liquid phase separation, solid phase is carried out drying, remove moisture, be the low molecular weight hydroxypropyl guar gum.
Embodiment 2:
In the encloses container of belt stirrer, add 200 parts of ethanol, start agitator, stirred three minutes behind the guar gum flour that slow adding is 100 parts, water, the 6 parts of content (weight) that add 40 parts then successively are 30% acetic acid solution, stir, be heated to 55 ℃, remained under 55 ± 5 ℃ the temperature reaction 2 hours, be cooled to below 30 ℃, add 2 parts of content and be 40% potassium hydroxide solution, stirred 10 minutes, centrifugal, filter, with solid phase and liquid phase separation, solid phase is carried out drying, remove moisture, be low molecule guar gum.
Embodiment 3:
In the encloses container of belt stirrer, add 200 parts of ethanol, start agitator, stirred three minutes behind the tonka-bean rubber powder that slow adding is 100 parts, water, the 12 parts of content (weight) that add 40 parts then successively are 30% technical hydrochloric acid, stir, be heated to 55 ℃, remained under 55 ± 5 ℃ the temperature reaction 2 hours, be cooled to below 30 ℃, add 3 parts of content (weight) and be 40% sodium hydrogen carbonate solution, stirred 10 minutes, centrifugal, filter, with solid phase and liquid phase separation, solid phase is carried out drying, remove moisture, be low molecule fenugreek gum.
Claims (5)
1. the preparation method of a low molecular plant gum, the degradation method that it adopts chemistry partly ruptures the macromolecular chain of vegetable jelly, and obtains low molecular plant gum;
(1) the chemical reaction weight proportion is:
30～140 parts in water
200～400 parts of ethanol
100 parts of vegetable jelly
2～30 parts of mineral alkalis
2～30 parts of inorganic or organic acids
(2) the chemical reaction process step is:
According to above-mentioned chemical reaction proportioning, at first in having the encloses container of agitator, add ethanol, start agitator, slowly adding vegetable jelly stirred after three minutes, add entry, content (weight) more successively and be 30% inorganic or organic acid, be heated with stirring to 55 ℃, remain under 55 ± 5 ℃ the temperature reaction 2 hours, and be cooled to then below 30 ℃, add content (weight) again and be 30% inorganic alkali solution, stirred 10 minutes, centrifugal, filtration with solid phase and liquid phase separation, are carried out drying to solid phase, remove moisture, be low molecular plant gum; Described inorganic or organic acid is meant the inorganic or organic acid that all kinds of energy are water-soluble, and described mineral alkali is meant the oxyhydroxide or the basic salt of sodium, potassium.
2. the preparation method of a kind of low molecular plant gum according to claim 1, it is characterized in that: described vegetable jelly refers to the vegetable jelly that contains semi-lactosi or seminose or their chemistry, physically modified derivative, and cellulose family vegetable jelly or their chemically modified derivative.
3. the preparation method of a kind of low molecular plant gum according to claim 2, it is characterized in that: the described vegetable jelly that contains semi-lactosi or seminose is guar gum, fenugreek gum, sesbania gum or konjak gum.
4. the preparation method of a kind of low molecular plant gum according to claim 1, it is characterized in that: described mineral alkali is sodium hydroxide, potassium hydroxide, yellow soda ash, salt of wormwood, sodium bicarbonate or saleratus.
5. the preparation method of a kind of low molecular plant gum according to claim 1 is characterized in that: the water-soluble inorganic or organic acid of described energy is sulfuric acid, hydrochloric acid, acetate or formic acid.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009100209393A CN101475775B (en) | 2009-01-16 | 2009-01-16 | Preparation of low molecular plant gum |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2009100209393A CN101475775B (en) | 2009-01-16 | 2009-01-16 | Preparation of low molecular plant gum |
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| CN101475775A CN101475775A (en) | 2009-07-08 |
| CN101475775B true CN101475775B (en) | 2010-12-29 |
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| CN2009100209393A Expired - Fee Related CN101475775B (en) | 2009-01-16 | 2009-01-16 | Preparation of low molecular plant gum |
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103666437B (en) * | 2012-09-18 | 2016-06-08 | 中国石油天然气股份有限公司 | A kind of fracturing liquid |
| CN103555297B (en) * | 2013-11-15 | 2015-09-23 | 西安石油大学 | Method for preparing environment-friendly oil field thickening agent from citrus peel and application |
| CN104531102B (en) * | 2015-01-13 | 2016-03-23 | 北京培康佳业技术发展有限公司 | Drilling fluid natural polymer fluid loss agent and preparation method thereof and application |
| CN106833558A (en) * | 2016-12-30 | 2017-06-13 | 戴琪 | A kind of preparation method of fast molten low viscosity type drilling fluid coating agent |
| CN110437819A (en) * | 2019-09-17 | 2019-11-12 | 四川洁能锐思石油技术有限公司 | A kind of low polymer fracturing fluid and preparation method thereof |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1699499A (en) * | 2005-06-17 | 2005-11-23 | 甘肃省庆阳长庆井下化工厂 | Low-molecular environmentally-friendly fracturing fluid and use of recovery liquid thereof |
| CN1935848A (en) * | 2006-08-25 | 2007-03-28 | 甘肃省庆阳长庆井下化工厂 | Method for preparing quick-dissolving chemically modified vegetable gum |
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2009
- 2009-01-16 CN CN2009100209393A patent/CN101475775B/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1699499A (en) * | 2005-06-17 | 2005-11-23 | 甘肃省庆阳长庆井下化工厂 | Low-molecular environmentally-friendly fracturing fluid and use of recovery liquid thereof |
| CN1935848A (en) * | 2006-08-25 | 2007-03-28 | 甘肃省庆阳长庆井下化工厂 | Method for preparing quick-dissolving chemically modified vegetable gum |
Non-Patent Citations (1)
| Title |
|---|
| 王丽伟等.瓜尔胶低分子量化降解条件研究.《油田化学》.2006,第23卷(第1期),32-35. * |
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