Preparation method of pre-crosslinked starch-based low-residue thickening agent

A starch-based, thickening agent technology, applied in chemical instruments and methods, drilling compositions and other directions, can solve problems such as incomplete gel breaking and many residues, and achieve low cost, reduced residue rate, and simple preparation steps. Effect

Inactive Publication Date: 2016-05-11
CHANGZHOU QINGFA IND GAS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention: in view of the fact that the natural polymer thickeners currently used are prone to cross-linking reactions after use, the water contains more insolubles, more residues, and at the same time, its gel breaking is not thorough. A kind of acrylic acid monomer grafted on the starch group, so that it is not easy to cross-link and produce a lot of residue during use, and its viscosity coefficient will also be improved, and its room temperature viscosity coefficient can reach more than 40MPa·s

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0017] First, weigh 40 parts of starch, 5 parts of ammonium persulfate, 10 parts of hydrogen peroxide, and 45 parts of deionized water in parts by weight, ultrasonically disperse at 300W for 15 minutes, leave to oxidize for 2 hours, and prepare oxidized starch liquid, then Heat the oxidized starch solution in a water bath at 70°C to make it gelatinized for 3 hours, adjust the pH to 8.0 with a 20% sodium hydroxide solution to prepare a modified starch solution; collect the modified starch solution prepared above, Allow it to stand and cool to 30°C, then weigh 65 parts of the modified starch liquid after standing and cooling, 2 parts of sorbitan fatty acid ester, 3 parts of sodium bisulfite, Put 5 parts of potassium persulfate and 25 parts of acrylate into a four-necked flask, stir and mix, blow nitrogen to remove the air, and then place it in a water bath at 75°C for 3 hours under the protection of nitrogen. After the reaction is completed, stop stirring and let stand Cool to 3...

example 2

[0019] First, weigh 25 parts of starch, 10 parts of ammonium persulfate, 15 parts of hydrogen peroxide and 50 parts of deionized water in parts by weight, ultrasonically disperse at 200W for 10 minutes, leave to oxidize for 1 hour, and prepare oxidized starch liquid, then Heat the oxidized starch solution in a 65°C water bath to make it gelatinized for 2 hours, adjust the pH to 8.0 with a 20% sodium hydroxide solution to prepare a modified starch solution; collect the modified starch solution prepared above, Allow it to stand and cool to 20°C, then weigh 45 parts of the modified starch liquid after standing and cooling, 3 parts of sorbitan fatty acid ester, 4 parts of sodium bisulfite, Put 8 parts of potassium persulfate and 40 parts of acrylate into a four-necked flask, stir and mix, and ventilate the air with nitrogen, then place it in a water bath at 68°C for 2 hours under the protection of nitrogen, and stop stirring after the reaction is complete, and let it stand Cool to...

example 3

[0021]First, weigh 30 parts of starch, 10 parts of ammonium persulfate, 10 parts of hydrogen peroxide and 50 parts of deionized water in parts by weight, ultrasonically disperse at 250W for 12 minutes, leave to oxidize for 1 hour, and prepare oxidized starch liquid, then Heat the oxidized starch solution in a 68°C water bath to make it gelatinized for 2 hours, adjust the pH to 8.0 with a 20% sodium hydroxide solution to prepare a modified starch solution; collect the modified starch solution prepared above, Allow it to stand and cool to 25°C, then weigh 50 parts of the modified starch liquid after standing and cooling, 2 parts of sorbitan fatty acid ester, 3 parts of sodium bisulfite, Put 5 parts of potassium persulfate and 40 parts of acrylate into a four-necked flask, stir and mix, blow nitrogen to remove the air, and then place it in a water bath at 70°C for 2 hours under the protection of nitrogen. After the reaction is completed, stop stirring and let stand Cool to 25°C t...

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Abstract

The invention relates to a preparation method of a pre-crosslinked starch-based low-residue thickening agent, and belongs to the technical field of thickening agent preparation. The method comprises the steps that starch is mixed with ammonium persulfate, hydrogen peroxide and deionized water, ultrasonic dispersion, standing and oxidation are conducted, and oxidized starch liquid is obtained; gelatinization is conducted on the oxidized starch liquid through heating in a water bath, the pH is adjusted, and modified starch liquid is obtained; the modified starch liquid is mixed with substances such as sorbitan fatty acid ester and potassium persulfate, a reaction is conducted, and crosslinked starch modified liquid is obtained; a potassium chloride solution and a boric acid solution are added, and a starch-based thickening agent base solution is prepared; under the action of potassium persulfate, heating in the water bath, centrifugal filtration and concentration are conducted, and the thickening agent is obtained. According to the preparation method of the pre-crosslinked starch-based low-residue thickening agent, the situation that a large number of residues are generated due to the fact that crosslinking is caused is not prone to occurrence in use, and the residue rate is decreased by 10%-15%; the viscosity coefficient of the thickening agent is somewhat increased, and the viscosity coefficient at room temperature reaches 40 MPa.s or above.

Description

technical field [0001] The invention relates to a preparation method of a pre-crosslinked starch-based low-residue thickener, and belongs to the technical field of thickener preparation. Background technique [0002] Fracturing technology is a conventional stimulation technology. The type of fracturing fluid used in hydraulic fracturing and its performance are closely related to the creation of fractures with a certain size and conductivity, which is an important factor affecting the success or failure of fracturing. There are strict requirements on the properties of fracturing fluids, such as viscosification, rheology, fluid loss, friction loss, stability, and formation damage. Among them, the thickener (ie, thickener) that increases the viscosity of the fracturing fluid is the main component of the fracturing fluid. [0003] Generally, in the process of implementing fracturing stimulation, it is necessary to select a suitable fracturing fluid system in order to reduce the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F251/00C08F220/10C08B31/18C09K8/68
CPCC08F251/00C08B31/185C09K8/68C09K8/90C08F220/10
Inventor 陈蓉蓉薛红娟高力群
Owner CHANGZHOU QINGFA IND GAS CO LTD
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