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Hydrophobic starch-nanometer calcium carbonate compound and preparation method thereof

A technology of nano-calcium carbonate and hydrophobic starch, which is applied in drilling compositions, chemical instruments and methods, etc., can solve the problems of undiscovered hydrophobic starch-nano-calcium carbonate complexes, high environmental pressure and high cost, and achieve good storage conditions. layer protection effect, reducing environmental stress, and fully reacting

Active Publication Date: 2015-05-20
CHINA PETROCHEMICAL CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the purity of the product obtained by the dry method is not high, its requirements in the drilling fluid are relatively low, and the impurities contained in it can be ignored in most cases; it also has low production costs, low energy consumption in the production process, and low environmental pressure. Advantages, can effectively overcome the disadvantages of high cost, high energy consumption and high environmental pressure caused by the large amount of solvent required in the production process of organic solvent method
At present, there is no relevant report on the hydrophobic starch-nano-calcium carbonate composite produced by the dry method in China

Method used

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  • Hydrophobic starch-nanometer calcium carbonate compound and preparation method thereof

Examples

Experimental program
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Effect test

example 1

[0022] Weigh 1000 grams of starch and place it in a kneader, add 100 grams of sodium carbonate, 125 milliliters of water, and 125 milliliters of ethanol in sequence, set the temperature at 25°C, and knead and alkalize the reaction for 40 minutes; add 125 milliliters of ethanol, 150 milliliters of benzene Formyl chloride, heat up to 30°C, and knead in a closed manner for 60 minutes; slowly add 1000 grams of nano-calcium carbonate, heat up to 30°C, and knead in a closed manner for 30 minutes; stop stirring, lower the temperature to room temperature, and continue to stand for 6 hours, and the Material; washed with ethanol for 3-5 times, dried in a vacuum oven at 60°C for 24 hours, and then pulverized to obtain the product of the present invention. Product performance: The degree of hydrophobic substitution is 16.13%, the starting pressure of the oil phase is 0.25MPa, the oil-water passage ratio is 0.95, and the permeability recovery rate is 82.1-89.7%.

example 2

[0024] Weigh 1500 grams of starch and place it in a kneader, add 150 grams of sodium carbonate, 150 milliliters of water, and 187 milliliters of ethanol in sequence, set the temperature at 25 ° C, and knead and alkalize the reaction for 60 minutes; add 187 milliliters of ethanol, 225 milliliters of benzene Formyl chloride, heat up to 35°C, and knead in airtight for 90 minutes; slowly add 750 grams of nano-calcium carbonate, heat up to 40°C, and knead in airtight for 60 minutes; stop stirring, lower the temperature to room temperature, and continue to stand for 4 hours. Material; washed with ethanol for 3-5 times, dried in a vacuum oven at 60°C for 24 hours, and then pulverized to obtain the product of the present invention. Product performance: The degree of hydrophobic substitution is 22.35%, the starting pressure of the oil phase is 0.13MPa, the oil-water passage ratio is 1.51, and the permeability recovery rate is 86.8-95.3%.

example 3

[0026] Weigh 2000 grams of starch and place it in a kneader, add 200 grams of sodium carbonate, 200 milliliters of water, and 250 milliliters of ethanol in sequence, set the temperature at 25 ° C, and knead and alkalize the reaction for 80 minutes; add 250 milliliters of ethanol, 300 milliliters of benzene Formyl chloride, heat up to 40°C, and knead in airtight for 120 minutes; slowly add 1500 grams of nano-calcium carbonate, heat up to 50°C, and knead in airtight for 80 minutes; stop stirring, lower the temperature to room temperature, and continue to stand for 3 hours. Material; washed with ethanol for 3-5 times, dried in a vacuum oven at 60°C for 24 hours, and then pulverized to obtain the product of the present invention. Product performance: The degree of hydrophobic substitution is 20.73%, the starting pressure of the oil phase is 0.21MPa, the oil-water passage ratio is 1.21, and the permeability recovery rate is 83.7-91.5%.

[0027] Product Evaluation of Examples

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Abstract

The invention relates to a hydrophobic starch-nanometer calcium carbonate compound and a preparation method thereof, and belongs to the technical filed of hydrophobization temporary plugging. The preparation method of the compound comprises the following steps: placing 1000-2000g of starch in a kneader, sequentially adding 100-200g of sodium carbonate, 100-200mL of water and 125-250mL of ethanol, and carrying out a closed kneading reaction at a preset temperature; sequentially adding 125-250mL of ethanol and 150-300Ml of benzoyl chloride, and carrying out a closed kneading reaction at 30-40DEG C; slowly adding 500-1500g of nanometer calcium carbonate, and carrying out a closed kneading reaction at 30-50DEG C; and stopping stirring, cooling to room temperature, allowing the obtained material to stand for 3-6h, discharging the material, washing, drying, and crushing to obtain a product. The product has a same substitution value with products obtained through an organic solvent method, can effectively reduce the oil phase starting pressure, increases the oil water passing ratio, maintains high permeability restoration ratio, and has a good reservoir protection effect.

Description

technical field [0001] The invention relates to the technical field of petroleum drilling hydrophobization temporary plugging, in particular to a kneading preparation method of a hydrophobic starch-nanometer calcium carbonate compound for drilling fluid. Background technique [0002] On the basis of conventional temporary plugging technology, hydrophobic components are used to generate lipophilic organic matter channels through mud cakes. During drilling and completion, the channel controls the inflow of filtrate, while creating an effective oil flow channel in the mud cake, allowing oil and gas to easily enter the wellbore. The resulting mud cake has a very low permeability to water and a much higher permeability to oil, and can gradually dissociate in the oil flow during the commissioning period, thereby achieving the effect of self-blocking removal. Hydrophobic temporary plugging technology, as a mud cake-free technology, can eliminate the use of chemical breakers, there...

Claims

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Application Information

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IPC IPC(8): C08L3/02C08K3/26C09K8/035
Inventor 徐运波蓝强李公让郑成胜张鹏李海斌张敬辉
Owner CHINA PETROCHEMICAL CORP
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