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
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

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Method used

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Examples

Experimental program
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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%.

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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%...

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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

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Application Information

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IPC IPC(8): C09K8/42
Inventor 蓝强李公让薛玉志张敬辉张虹
Owner CHINA PETROCHEMICAL CORP
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