Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Preparation method of nano calcium carbonate-starch composite for drilling fluid

A technology of nano calcium carbonate and composites, applied in the direction of drilling compositions, chemical instruments and methods, etc.

Active Publication Date: 2011-07-27
CHINA PETROCHEMICAL CORP +1
View PDF2 Cites 12 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, at present, there is no relevant report on the synthesis of nano calcium carbonate-starch composites.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Dissolve 200 grams of starch in 800 ml of ethanol solution (ethanol concentration of 15%); stir at high speed at 1500 rpm for 10 minutes; pour the formed starch emulsion into a 2-liter three-necked flask; use a mass fraction of 3.0% Adjust the pH value of the sodium carbonate solution to 6.0; stir in a water bath at 25°C at 1500 rpm for 20 minutes; raise the temperature to 35°C, slowly drop in a 5.0% mass fraction octenyl succinic anhydride solution, and react for 20 minutes; Add 20 grams of nano-calcium carbonate, raise the temperature to 30°C, and stir at high speed for 30 minutes; add 10.0% glacial acetic acid and continue stirring for 10 minutes; stop stirring and lower the temperature to room temperature; precipitate with ethanol and wash 10 Next, it was dried in a vacuum drying oven at 60°C to obtain the product of the present invention. The performance of the product is as follows: the substitution degree is 11.25%, and the permeability recovery value is 91%.

[00...

Embodiment 2

[0046] Dissolve 300 grams of starch in 800 ml of ethanol solution (ethanol concentration of 15%); stir at 1500 rpm for 20 minutes at high speed; pour the formed starch emulsion into a 2-liter three-necked flask; use a mass fraction of 3.0% Adjust the pH value of the sodium carbonate solution to 7.0; stir in a water bath at 25°C at 1500 rpm for 20 minutes; raise the temperature to 35°C, slowly drop in a 5.0% mass fraction octenyl succinic anhydride solution, and react for 30 minutes; Add 40 grams of nano calcium carbonate, increase the temperature to 40℃, stir at high speed for 40 minutes; add 10.0% glacial acetic acid, and continue stirring for 20 minutes; stop stirring, and lower the temperature to room temperature; precipitate with ethanol and wash for 20 minutes Next, it was dried in a 60°C vacuum drying oven to obtain the product of the present invention. The performance of the product is as follows: the substitution degree is 15.31%, and the permeability recovery value is ...

Embodiment 3

[0048] Dissolve 400 grams of starch in 1500 ml of ethanol solution (15% ethanol concentration); stir at high speed at 1500 rpm for 30 minutes; pour the formed starch emulsion into a 2-liter three-necked flask; use a mass fraction of 3.0% Adjust the pH value of the sodium carbonate solution to 8.0; stir in a water bath at 25°C at 1500 rpm for 30 minutes; raise the temperature to 35°C, slowly drop in a 5.0% mass fraction octenyl succinic anhydride solution, and react for 40 minutes; Add 60 grams of nano calcium carbonate, increase the temperature to 40℃, stir at high speed for 50 minutes; add 10.0% glacial acetic acid, and continue stirring for 30 minutes; stop stirring and lower the temperature to room temperature; precipitate with ethanol and wash for 20 minutes Next, it was dried in a 60°C vacuum drying oven to obtain the product of the present invention. The performance of the product is as follows: the substitution degree is 16.41%, and the permeability recovery value is 96%...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention relates to a synthesis method of a nano calcium carbonate-starch composite, belonging to the temporary plugging / shielding technique of reservoir protection. Starch and succinyl oxide react in water phase environment under the catalysis of NaOH, nano calcium carbonate is added 1 to 1.5 hours after the reaction, and glacial acetic acid is used for neutralization. The nano calcium carbonate-starch composite is obtained through purification and vacuum drying. The method provided by the invention has the characteristics of reacting at normal pressure, simple production process, low reaction temperature of between 30 and 50 DEG C, and simpleness and convenience for a purification method due to the use of low-toxicity solvent; and the nano calcium carbonate-starch composite with high purity can be obtained.

Description

Technical field [0001] The invention designs a drilling fluid treatment agent used in the drilling process of petroleum exploration wells and production wells, and the treatment agent is suitable for shielding temporary plugging technology for protecting reservoirs. technical background [0002] At present, in the process of oilfield exploration and development, many large oilfields at home and abroad have entered the later stage of development, and some low-grade oil reservoirs have been put into development one after another. The exploration and development of these oil reservoirs are difficult and require high drilling fluids. In the drilling process, drilling fluid is essential. It can carry and suspend the cuttings, stabilize the well wall and balance the formation pressure, cool and lubricate the drill bit and drilling tool, and transmit water power. The performance of the drilling fluid directly affects the quality of the well and the drilling speed. In the process of dr...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): C09K8/42
Inventor 蓝强李公让薛玉志张敬辉张虹
Owner CHINA PETROCHEMICAL CORP
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com