A kind of preparation method of amphiphilic starch fluid loss reducer for water-based drilling fluid

A technology of water-based drilling fluid and fluid loss control agent, which is applied in the direction of drilling composition, chemical instruments and methods, etc., can solve the problems of no amphiphilic starch, etc., and achieve the effect of good compatibility and high temperature resistance

Active Publication Date: 2021-02-02
CHINA PETROCHEMICAL CORP +3
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Up to now, there is no report on the use of amphiphilic starch as a fluid loss control agent for water-based drilling fluids

Method used

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  • A kind of preparation method of amphiphilic starch fluid loss reducer for water-based drilling fluid
  • A kind of preparation method of amphiphilic starch fluid loss reducer for water-based drilling fluid
  • A kind of preparation method of amphiphilic starch fluid loss reducer for water-based drilling fluid

Examples

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Effect test

example 1

[0030] Weigh 1000 parts of starch, add it to a three-necked flask, then add 100 parts of methanol, place the three-necked flask in a water bath with a temperature of 35°C, and stir at a speed of 300 rpm for 30 minutes; add 100 parts of sodium hydroxide and 2000 parts of water, continue to stir for 30 minutes; sequentially add 100 parts of sodium hydroxide, 300 parts of chloroacetic acid, 200 parts of methanol, heat up to 60 ° C, and react for 60 minutes; cool to room temperature (10 ° C), add 100 parts of sodium carbonate and 0.5 parts of Chloroform, continue to stir for 10 minutes; add 100 parts of sodium carbonate and 800 parts of acrylic acid in sequence, raise the temperature to 40°C, and stir at a speed of 500 rpm for 30 minutes, during which nitrogen gas is introduced; add 10 parts of ammonium persulfate, heat up to 70°C, Continue to react for 120 minutes; stop stirring, lower the temperature to room temperature (10°C), and continue to stand for 120 minutes, then discharg...

example 2

[0032] Weigh 1000 parts of starch, add it into a three-necked flask, then add 200 parts of methanol, place the three-necked flask in a water bath with a temperature of 35°C, and stir at a speed of 300 rpm for 30 minutes; add 150 parts of sodium hydroxide and 2500 parts of water, continue to stir for 30 minutes; sequentially add 100 parts of sodium hydroxide, 400 parts of chloroacetic acid, 200 parts of methanol, heat up to 60 ° C, and react for 70 minutes; cool to room temperature (15 ° C), add 150 parts of sodium carbonate and 1.0 parts of Chloroform, continue to stir for 10 minutes; add 200 parts of sodium carbonate and 1500 parts of 3-phenyl-2-acrylic acid in sequence, heat up to 50 ° C, stir at 500 rpm for 35 minutes, and feed nitrogen during the period; add 15 parts of persulfuric acid Potassium, heat up to 75°C, continue to react for 160 minutes; stop stirring, lower the temperature to room temperature (15°C), and continue to stand for 150 minutes, then discharge; centrif...

example 3

[0034] Weigh 1000 parts of starch, add it into a three-necked flask, then add 300 parts of methanol, place the three-necked flask in a water bath with a temperature of 35°C, and stir at a speed of 300 rpm for 30 minutes; add 200 parts of sodium hydroxide and 3000 parts of water, continue to stir for 30 minutes; sequentially add 200 parts of sodium hydroxide, 500 parts of chloroacetic acid, 300 parts of methanol, heat up to 60 ° C, and react for 80 minutes; cool to room temperature (25 ° C), add 200 parts of sodium carbonate and 0.8 parts of Chloroform, continue to stir for 10 minutes; add 150 parts of sodium carbonate and 1800 parts of acrylonitrile successively, heat up to 40 ° C, stir at 500 rpm for 40 minutes, and feed nitrogen at the same time; add 20 parts of cyclohexanone peroxide, and heat up to 80°C, continue to react for 180 minutes; stop stirring, lower the temperature to room temperature (25°C), and continue to stand for 180 minutes, then discharge; centrifuge, wash ...

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Abstract

The invention relates to a preparation method of an amphiphilic starch fluid loss reducer for water-based drilling fluid used in the drilling process of oil exploration wells and production wells. It is formed by first reacting waxy cornstarch with a hydrophilic modifier, and then grafting hydrophobic monomers onto the waxy cornstarch through free polymerization. Compared with the prior art, the present invention has the following advantages: the amphiphilic starch fluid loss reducer has higher high temperature resistance and can be used at 130-150°C; Salt to 5.0%; amphiphilic starch has little effect on the viscosity of drilling fluid; amphiphilic starch can be completely biodegraded, has no biological toxicity, and has no impact on the environment; has certain oil dispersibility, and can be used as a filter reducer for oil-based drilling fluid loss agent; amphiphilic starch has good compatibility with various drilling fluid treatment agents.

Description

technical field [0001] The invention designs a preparation method of an amphiphilic starch fluid loss reducer for water-based drilling fluid used in the drilling process of petroleum exploration wells and production wells. Background technique [0002] At present, only etherified starch is used as a water-based fluid loss reducer in the drilling field in China, but its temperature resistance is only around 100°C, its salt resistance is poor, and it cannot be used in oil-based drilling fluids. greatly limited its scope of application. Other modification methods, such as grafting, cross-linking and other compound modification, have many research reports, but the product has complicated process, more impurities, higher cost, and poor environmental protection, so the actual field application is very little. Therefore, using a simple and low-cost synthetic process to produce amphiphilic starch treatment agents for drilling fluids resistant to temperature and salt has become an u...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/035C08F251/00
CPCC08F251/00C09K8/035
Inventor 蓝强郑成胜徐运波张鹏李公让张敬辉张虹夏晔张妍
Owner CHINA PETROCHEMICAL CORP
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