Application of nanocrystalline cellulose serving as fluid loss additive for drilling fluid as well as drilling fluid

A technology of nanocrystalline cellulose and fluid loss control agent, which is applied in the directions of drilling compositions, chemical instruments and methods, etc., can solve the problem of high cost of fluid loss control agent

Active Publication Date: 2015-07-29
CHINA UNIV OF PETROLEUM (BEIJING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to overcome the defect that the cost of fluid loss control agent for drilling fluid is too high in the prior art, and to provide the application of nanocrystalline cellulose as fluid loss control agent for drilling fluid and drilling fluid

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example 1

[0064] (1) 40g of microcrystalline cellulose (purchased from Hubei Sinomaterials Chemical Co., Ltd., the average particle size of the particles is 20 μm) is added into 700mL of sulfuric acid aqueous solution with a concentration of 64% by weight, and at 45°C at 250 rpm Stir at high speed for 3 hours;

[0065] (2) Add 3L of deionized water to the mixture obtained in step (1) to terminate the hydrolysis reaction of microcrystalline cellulose; centrifuge the obtained suspension for 20min at 11000r / min, then wash the solid obtained by centrifugation with deionized water Washing several times until the pH of the supernatant obtained by centrifugation was 7; the washed solid was dried at 105° C. for 12 hours to obtain 35.28 g of nanocrystalline cellulose N1 with a yield of 88.2%. The average particle diameter of the product nanocrystalline cellulose measured by a transmission electron microscope (TEM) is 239 nm, and the nanocrystalline cellulose is rod-shaped.

preparation example 2

[0067] (1) 40g of microcrystalline cellulose (purchased from Hubei Sinomaterials Chemical Co., Ltd., the average particle diameter of the particles is 80 μm) is added into 700mL of sulfuric acid aqueous solution with a concentration of 64% by weight, and at 45°C at 250 rpm Stir at high speed for 3 hours;

[0068] (2) Add 3L of deionized water to the mixture obtained in step (1) to terminate the hydrolysis reaction of microcrystalline cellulose; centrifuge the obtained suspension for 20min at 11000r / min, then wash the solid obtained by centrifugation with deionized water Washing several times until the pH of the supernatant obtained by centrifugation was 7; the washed solid was dried at 105° C. for 8 hours to obtain 33.08 g of nanocrystalline cellulose N2 with a yield of 82.7%. The average particle diameter of the product nanocrystalline cellulose measured by a transmission electron microscope (TEM) is 558 nm, and the nanocrystalline cellulose is rod-shaped.

preparation example 3

[0070] (1) 40g of microcrystalline cellulose (purchased from Hubei Sinomaterials Chemical Co., Ltd., the average particle size of the particles is 50 μm) is added into 700mL of sulfuric acid aqueous solution with a concentration of 64% by weight, and at 45°C at 250 rpm Stir at high speed for 3 hours;

[0071] (2) Add 3L of deionized water to the mixture obtained in step (1) to terminate the hydrolysis reaction of microcrystalline cellulose; centrifuge the obtained suspension for 15min at 11000r / min, then wash the solid obtained by centrifugation with deionized water Washing several times until the pH of the supernatant obtained by centrifugation was 7; the washed solid was dried at 105° C. for 8 hours to obtain 33.96 g of nanocrystalline cellulose N3 with a yield of 84.9%. The average particle diameter of the product nanocrystalline cellulose measured by a transmission electron microscope (TEM) is 370 nm, and the nanocrystalline cellulose is rod-shaped.

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Abstract

The invention relates to an application of nanocrystalline cellulose serving as a fluid loss additive for a drilling fluid as well as the drilling fluid. The drilling fluid contains the fluid loss additive which adopts the nanocrystalline cellulose. The provided nanocrystalline cellulose serving as the fluid loss additive for the drilling fluid has the characteristic of lower cost as well as excellent fluid loss reduction function.

Description

technical field [0001] The invention relates to the application of nanocrystalline cellulose as a fluid loss reducer for drilling fluid and the drilling fluid. Background technique [0002] The problem of maintaining wellbore stability is a worldwide problem in the drilling industry. This problem exists in many oil fields in the world and has not been well resolved. As my country's oil and gas exploration and development targets are further oriented toward deep oil and gas resources buried in very complex geological conditions and unconventional resources such as coalbed methane and shale gas, wellbore stability problems are often encountered during the drilling process, which will lead to complex deep wells and shale gas. The slow drilling speed of gas horizontal wells, many complex accidents, long drilling cycle and high cost have seriously affected the exploration and development process of important replacement areas of oil and gas resources in my country. [0003] Durin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/035C09K8/20
CPCC09K8/035C09K8/20C09K8/206C09K2208/08C09K2208/10
Inventor 蒋官澄宣扬张县民宋然然
Owner CHINA UNIV OF PETROLEUM (BEIJING)
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