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Preparation method of nano cellulose derivative with good performance

A technology of nanocellulose and derivatives, applied in the field of oilfield chemical applications, can solve problems such as environmental pollution, unfavorable sustainable development, and inability to effectively plug micro-nano fracture formations, etc., to achieve easy access to raw materials, improved thermal stability, and good The effect of stability

Pending Publication Date: 2022-01-14
SOUTHWEST PETROLEUM UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to solve the problem that the conventional plugging agent has environmental pollution, is not conducive to sustainable development, and cannot effectively plug the formation of micro-nano fractures, a nano-cellulose derivative NC-XS was prepared from cellulose powder (α-Cellulose) in this paper. , using cellulose as raw material, preparing nanocellulose by acidification first, and then grafting and modifying, to efficiently prepare nanocellulose derivatives, simple and easy to operate, with good properties, and can be well used as a plugging agent in drilling in liquid system

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] (1) Weigh the nanocellulose NC-X30g (dry basis) prepared in the early stage, add a certain amount of deionized water to adjust the mass fraction to 5%, stir at room temperature on a magnetic stirring pot for 10 minutes for prehydration, and then add Fix in a three-necked flask in a constant temperature water bath, feed nitrogen into the three-necked flask to exhaust oxygen for 10 minutes. And adjust the temperature to 40°C to keep the temperature constant.

[0020] (2) The pH value of the cellulose powder suspension is adjusted to 2 with a concentration of 20% sulfuric acid. After the temperature is stabilized, 200 ml of 0.5% ammonium persulfate (relative to the monomer) is added to the three-necked flask to initiate the reaction, and stirred for 20 minutes to form a primary free radicals.

[0021] (3) Continue to feed nitrogen, add 200ml of 2:1 AMPS monomer solution for preparation reaction, keep the temperature constant during the reaction, and finish the reaction af...

Embodiment 2

[0026] (1) Take nanocellulose NC-X 25g (dry basis) prepared in the early stage, add a certain amount of deionized water to adjust the mass fraction to 4%, stir at room temperature on a magnetic stirring pot for 10 minutes to prehydrate, then add to Fix in a three-necked flask in a constant temperature water bath, feed nitrogen into the three-necked flask to exhaust oxygen for 10 minutes. And adjust the temperature to 35°C to keep the temperature constant.

[0027] (2) The pH value of the cellulose powder suspension is adjusted to 2 with a concentration of 20% sulfuric acid. After the temperature is stabilized, 200 ml of 0.5% ammonium persulfate (relative to the monomer) is added to the three-necked flask to initiate the reaction, and stirred for 20 minutes to form a primary free radicals.

[0028] (3) Continue to feed nitrogen, add 200ml of 2:1 AMPS monomer solution for preparation reaction, keep the temperature constant during the reaction, and finish the reaction after 4h. ...

Embodiment 3

[0033] (1) Weigh the nanocellulose NC-X32g (dry basis) prepared in the early stage, add a certain amount of deionized water to adjust the mass fraction to 5%, stir at room temperature on a magnetic stirring pot for 10 minutes for prehydration, and then add Fix in a three-necked flask in a constant temperature water bath, feed nitrogen into the three-necked flask to exhaust oxygen for 10 minutes. And adjust the temperature to 40°C to keep the temperature constant.

[0034] (2) The pH value of the cellulose powder suspension is adjusted to 3 with a concentration of 20% sulfuric acid. After the temperature is stabilized, 200 ml of 0.5% ammonium persulfate (relative to the monomer) is added to the three-necked flask to initiate the reaction, and stirred for 20 minutes to form a primary free radicals.

[0035] (3) Continue to feed nitrogen, add 200ml of 1.5:1 AMPS monomer solution for preparation reaction, keep the temperature constant during the reaction, and finish the reaction ...

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Abstract

The invention relates to the field of oil field chemistry application research, and provides a preparation method of a nano cellulose derivative with temperature resistance. Graft modification is carried out on prepared nano cellulose by a solution polymerization method to obtain the nano cellulose derivative with temperature resistance. The preparation method comprises the following steps of: pretreating fiber powder by ball milling, performing sulfuric acid hydrolysis on the basis to prepare nano cellulose, and performing graft modification on the nano cellulose by taking ammonium persulfate as an initiator and adopting a solution polymerization method. The preparation method has the beneficial effects that a strategy is provided for producing the nano cellulose derivative with a grafted AMPS group, and the AMPS group has good stability, so that the thermal stability, hydrolysis resistance and salt and calcium resistance of a medium product are improved to a certain extent. The prepared nano cellulose derivative has good temperature resistance, and breaks through the limitation of general temperature resistance of cellulose products.

Description

technical field [0001] The invention relates to the application field of oil field chemistry, in particular, the invention relates to a method for preparing nano-cellulose derivatives with good performance. Background technique [0002] Drilling fluid is a general term for various circulating fluids that use their various functional characteristics to meet the needs of drilling work during the drilling of oil and gas wells. The current drilling fluid must meet certain environmental protection requirements while ensuring safe and fast drilling, and must not pollute the environment and be sustainable. Nanocellulose not only has a variety of raw materials, but also has good environmental friendliness. When used in drilling fluid, it also has good shear dilution, strong enough structural rigidity, and large specific surface area. Therefore, exploring the ability of nanocellulose to plug micro-nano shale pores is of great significance for environmental protection, economic devel...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F251/02C08F220/58C08F2/04C08F4/34
CPCC08F251/02C08F2/04C08F4/34C08F220/585
Inventor 李方刘欣宇邢国庆林郑文苏俊霖王贵任妍君曹成
Owner SOUTHWEST PETROLEUM UNIV