CN111057160A - Preparation method of high amylose starch for fluid loss additive - Google Patents
Preparation method of high amylose starch for fluid loss additive Download PDFInfo
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- CN111057160A CN111057160A CN201911372963.3A CN201911372963A CN111057160A CN 111057160 A CN111057160 A CN 111057160A CN 201911372963 A CN201911372963 A CN 201911372963A CN 111057160 A CN111057160 A CN 111057160A
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08B—POLYSACCHARIDES; DERIVATIVES THEREOF
- C08B33/00—Preparation of derivatives of amylose
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G83/00—Macromolecular compounds not provided for in groups C08G2/00 - C08G81/00
- C08G83/001—Macromolecular compounds containing organic and inorganic sequences, e.g. organic polymers grafted onto silica
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
- C09K8/02—Well-drilling compositions
- C09K8/03—Specific additives for general use in well-drilling compositions
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Abstract
The invention discloses a preparation method of high amylose starch for a filtrate reducer, 1) acidification of the high amylose starch: adding 150 parts of water and 250 parts of high amylose corn starch and 100 parts of high amylose corn starch into a reaction container according to the parts by weight, starting stirring uniformly, slowly adding 31-35 wt% hydrochloric acid solution, adjusting the pH to 2-2.5, heating to 40-50 ℃, continuing stirring for 5-8h, and then carrying out suction filtration to obtain a filter cake, namely the high amylose corn starch acidification product; 2) adding 200 parts by weight of anhydrous ethanol and 300 parts by weight of absolute ethanol serving as a dispersing agent into a reaction container, then adding 100 parts by weight of the high amylose corn starch acidification product prepared in the step 1) and 5-10 parts by weight of calcium bentonite, opening reflux cooling water, stirring and reacting at the constant temperature of 80 ℃, and stopping the reaction for 3-4 hours; 3) and after the reaction is finished, adjusting the pH value to 8-10, and then drying and crushing to obtain the modified high amylose starch for the fluid loss additive. The starch is used as a raw material, is derived from plants, has no pollution, and can resist high temperature after being modified.
Description
Technical Field
The invention belongs to the technical field of soil improvement, and particularly relates to a preparation method of high amylose starch for a filtrate reducer.
Background
The drilling fluid is used as the 'blood' of the well drilling and is an important guarantee for realizing safe, high-quality and rapid well drilling, but the drilling fluid loses water inevitably, the magnitude of the filtrate loss is related to the safety of the well drilling process, and a thin and compact filter cake can be formed on the surface of a well wall by adding the filtrate reducer.
The main raw materials used for preparing the filtrate reducer under the existing conditions comprise humic acid, modified cellulose, lignin substances, tannin substances and the like. The prior art has the following disadvantages: 1. the existing polymer has imperfect performance, for example, the temperature resistance and salt tolerance of the tannin-type fluid loss agent are weak, and the polymer is not suitable for various complex strata. 2. The modified fiber filtrate reducer has a complex structure and is difficult to process. 3. The performance of the lignin fluid loss additive cannot be competitive with products produced by taking petroleum as a raw material. 4. Some fluid loss additives are not degradable and can also contaminate the environment. 5. The raw material cost of the filtrate reducer is higher at present.
Disclosure of Invention
The invention aims to provide a preparation method of high amylose starch for a fluid loss additive, which is used for preparing the fluid loss additive suitable for drilling fluid by using the high amylose corn starch as a raw material and stabilizing colloidal particles to increase the viscosity of filtrate, increase the pore-plugging effect and the like.
The purpose of the invention is realized by the following technical scheme:
the invention relates to a preparation method of high amylose starch for a filtrate reducer, which comprises the following steps:
1) high amylose acidification: adding 150 parts of water and 250 parts of high amylose corn starch and 100 parts of high amylose corn starch into a reaction container according to the parts by weight, starting stirring uniformly, slowly adding 31-35 wt% hydrochloric acid solution, adjusting the pH to 2-2.5, heating to 40-50 ℃, continuing stirring for 5-8h, and then carrying out suction filtration to obtain a filter cake, namely the high amylose corn starch acidification product;
2) adding 200 parts by weight of anhydrous ethanol and 300 parts by weight of absolute ethanol serving as a dispersing agent into a reaction container, then adding 100 parts by weight of the high amylose corn starch acidification product prepared in the step 1) and 5-10 parts by weight of calcium bentonite, opening reflux cooling water, stirring and reacting at the constant temperature of 80 ℃, and stopping the reaction for 3-4 hours;
3) and after the reaction is finished, adjusting the pH value to 8-10, and then drying and crushing to obtain the modified high amylose starch for the fluid loss additive.
Further, in the step 1), washing with ethanol for 3-4 times in the suction filtration process.
Further, in the step 1), 150 parts of water and 100 parts of high amylose corn starch are heated to 40 ℃ and stirred for 5 hours, and in the step 2), 5 parts of calcium bentonite are added.
Further, in the step 1), 250 parts of water and 100 parts of high amylose corn starch are heated to 50 ℃, stirred for 8 hours, and in the step 2), 10 parts of calcium bentonite is added.
Further, in the step 1), 200 parts of water and 100 parts of high amylose corn starch are heated to 45 ℃ and stirred for 7 hours, and in the step 2), 7 parts of calcium bentonite are added.
A high amylose starch for fluid loss additive is prepared by any one of the above methods.
Compared with the prior art, the invention has the following characteristics and beneficial effects:
1. the invention uses starch as raw material, has rich source and low price, and reduces cost;
2. the invention utilizes the property of high amylose double helix structure to react with bentonite to generate bentonite modified starch, and the starch has stronger chemical bond of C-O-Si, so the high temperature resistance is realized.
3. The invention uses starch as raw material, which is from plant, without pollution.
Detailed Description
The invention will now be further illustrated, but not by way of technical limitation, with reference to the following specific examples. It should be understood that these examples are for illustrative purposes only and are not intended to limit the scope of the present invention.
Example 1
This example provides a method for preparing high amylose starch for fluid loss additives,
1) high amylose acidification: adding 150 parts of water and 100 parts of high amylose corn starch into a reaction container according to the parts by weight, starting stirring uniformly, slowly adding 31-35 wt% hydrochloric acid solution, adjusting the pH to 2-2.5, heating to 40 ℃, continuing stirring for 5 hours, then carrying out suction filtration to obtain a filter cake, namely a high amylose corn starch acidification product, and washing with ethanol for 3-4 times in the suction filtration process;
2) adding 200 parts by weight of absolute ethyl alcohol into a reaction container as a dispersing agent, then adding 100 parts by weight of the high amylose corn starch acidification product prepared in the step 1) and 5 parts by weight of calcium bentonite, opening reflux cooling water, stirring and reacting at the constant temperature of 80 ℃, and stopping the reaction for 3 hours;
3) and after the reaction is finished, adjusting the pH value to 8-10, and then drying and crushing to obtain the modified high amylose starch for the fluid loss additive.
Example 2
This example provides a method for preparing high amylose starch for fluid loss additives,
1) high amylose acidification: adding 250 parts of water and 100 parts of high amylose corn starch into a reaction container according to the parts by weight, starting stirring uniformly, slowly adding 31-35 wt% hydrochloric acid solution, adjusting the pH to 2-2.5, heating to 50 ℃, continuing stirring for 8 hours, then carrying out suction filtration to obtain a filter cake, namely a high amylose corn starch acidification product, and washing with ethanol for 3-4 times in the suction filtration process;
2) adding 300 parts by weight of absolute ethyl alcohol into a reaction container to serve as a dispersing agent, then adding 100 parts by weight of the high amylose corn starch acidification product prepared in the step 1) and 10 parts by weight of calcium bentonite, opening reflux cooling water, stirring and reacting at the constant temperature of 80 ℃, and stopping the reaction for 4 hours;
3) and after the reaction is finished, adjusting the pH value to 8-10, and then drying and crushing to obtain the modified high amylose starch for the fluid loss additive.
Example 3
This example provides a method for preparing high amylose starch for fluid loss additives,
1) high amylose acidification: according to the weight parts, 200 parts of water and 100 parts of high amylose corn starch are added into a reaction container, after the reaction container is started to be uniformly stirred, 31-35 wt% hydrochloric acid solution is slowly added, the PH value is adjusted to 2-2.5, the temperature is raised to 45 ℃, the stirring is continued for 7 hours, then a filter cake obtained by suction filtration is obtained, namely a high amylose corn starch acidification product, and the filter cake is washed by ethanol for 3-4 times in the suction filtration process;
2) adding 250 parts by weight of absolute ethyl alcohol into a reaction container as a dispersing agent, then adding 100 parts by weight of the high amylose corn starch acidification product prepared in the step 1) and 7 parts by weight of calcium bentonite, opening reflux cooling water, stirring and reacting at the constant temperature of 80 ℃, and stopping the reaction for 3.5 hours;
3) and after the reaction is finished, adjusting the pH value to 8-10, and then drying and crushing to obtain the modified high amylose starch for the fluid loss additive.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (6)
1. A preparation method of high amylose starch for a fluid loss additive adopts a method of acidifying starch, and is characterized by comprising the following steps:
1) high amylose acidification: adding 150 parts of water and 250 parts of high amylose corn starch and 100 parts of high amylose corn starch into a reaction container according to the parts by weight, starting stirring uniformly, slowly adding 31-35 wt% hydrochloric acid solution, adjusting the pH to 2-2.5, heating to 40-50 ℃, continuing stirring for 5-8h, and then carrying out suction filtration to obtain a filter cake, namely the high amylose corn starch acidification product;
2) adding 200 parts by weight of anhydrous ethanol and 300 parts by weight of absolute ethanol serving as a dispersing agent into a reaction container, then adding 100 parts by weight of the high amylose corn starch acidification product prepared in the step 1) and 5-10 parts by weight of calcium bentonite, opening reflux cooling water, stirring and reacting at the constant temperature of 80 ℃, and stopping the reaction for 3-4 hours;
3) and after the reaction is finished, adjusting the pH value to 8-10, and then drying and crushing to obtain the modified high amylose starch for the fluid loss additive.
2. The method for preparing high amylose starch for a fluid loss additive according to claim 1, wherein the step 1) is performed by washing with ethanol for 3-4 times during the suction filtration.
3. The method for preparing high amylose starch for a fluid loss additive according to claim 1, wherein in step 1), the temperature is raised to 40 ℃ by 150 parts of water and 100 parts of high amylose corn starch, the mixture is stirred for 5 hours, and in step 2), the amount of calcium bentonite is 5 parts.
4. The method for preparing high amylose starch for a fluid loss additive according to claim 1, wherein the water content in step 1) is 250 parts, the high amylose corn starch content in step 100 parts, the temperature is raised to 50 ℃, the mixture is stirred for 8 hours, and the calcium bentonite content in step 2) is 10 parts.
5. The method for preparing high amylose starch for a fluid loss additive according to claim 1, wherein 200 parts of water and 100 parts of high amylose corn starch are added in step 1), the temperature is raised to 45 ℃, the mixture is stirred for 7 hours, and 7 parts of calcium bentonite are added in step 2).
6. A high amylose starch for fluid loss additives, obtainable by the process of any one of claims 1 to 5.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115960314A (en) * | 2023-03-15 | 2023-04-14 | 克拉玛依友联实业有限责任公司 | Preparation method of environment-friendly filtrate reducer and application of environment-friendly filtrate reducer in drilling fluid |
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| CN115960314A (en) * | 2023-03-15 | 2023-04-14 | 克拉玛依友联实业有限责任公司 | Preparation method of environment-friendly filtrate reducer and application of environment-friendly filtrate reducer in drilling fluid |
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