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Lignin-derived environmentally-friendly viscosity reducer for drilling fluid, and preparation method thereof

A lignin and drilling fluid technology, applied in chemical instruments and methods, drilling compositions, etc., can solve problems such as increased soaking expansion and collapse, decreased drilling fluid density, and increased fluid loss

Active Publication Date: 2020-01-24
XI'AN PETROLEUM UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In addition, various drilling fluid additives derived from lignin materials, including alkali lignin and lignosulfonate, foam severely during use. A large amount of foam will lead to a decrease in drilling fluid density, unable to balance the formation pressure, and there will be well kick and blowout risk
At the same time, the larger foam easily destroys the mud cake formed after the drilling fluid is filtered off on the well wall, which increases the permeability and increases the fluid loss. possibility of collapse

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] In the first step, the lignin material is mixed with 2 times the quality of water in a reaction vessel at normal temperature, and stirred evenly, the lignin material is industrial-grade sodium lignosulfonate, and the water is industrial-grade pure water;

[0017] In the second step, adding a metal salt having a mass ratio of 1:2 to the lignin material in the reaction vessel, stirring evenly, the metal salt is industrial-grade ferric chloride;

[0018] The third step is to add 5% foam inhibitor of lignin material mass to the above mixed solution in the reaction vessel, then add 3% lignin material mass % formaldehyde therein, stir evenly, and stir for 1 hour at 80° C. The cetylpyridinium chloride of technical grade that said foam suppressor is, and described formaldehyde is the aqueous formaldehyde solution of technical grade;

[0019] In the fourth step, the solvent of the above mixture is evaporated, and the mixture is crushed to below 40 meshes to obtain the lignin-der...

Embodiment 2

[0023] In the first step, the lignin material is mixed with 3 times the quality water in a reaction vessel at normal temperature, and stirred evenly, the lignin material is industrial-grade calcium lignosulfonate, and the water is deionized water;

[0024] In the second step, adding a metal salt having a mass ratio of 1:3 to the lignin material in the reaction vessel, stirring evenly, the metal salt is chemically pure ferric sulfate;

[0025] In the third step, add 3% foam inhibitor of lignin material mass to the above mixed solution in the reaction vessel, then add formaldehyde with 2% lignin material mass, stir evenly, and stir for 2 hours at 60° C. Said foam inhibitor is analytically pure dodecyltrimethylammonium chloride, and said formaldehyde is chemically pure formaldehyde solution;

[0026] In the fourth step, the solvent of the above mixture is evaporated, and the mixture is crushed to below 40 meshes to obtain the lignin-derived environmental-friendly viscosity reduce...

Embodiment 3

[0030]In the first step, the lignin material is mixed with 5 times the quality of water in a reaction vessel at normal temperature, and stirred evenly, the lignin material is chemical soda ash lignin, and the water is industrial grade mineral water;

[0031] In the second step, adding a metal salt with a mass ratio of 1:5 to the lignin material in the above-mentioned reaction vessel, stirring evenly, the metal salt is chemically pure ferrous chloride;

[0032] The third step is to add a foam inhibitor of 2% of the mass of lignin material to the above mixed solution in the reaction vessel, and then add formaldehyde of 1% of the mass of lignin material to it, stir evenly, and stir for 4 hours at 65°C. Said foam inhibitor is analytically pure cetyltrimethylammonium chloride, and said formaldehyde is analytically pure trioxane;

[0033] In the fourth step, the solvent of the above mixture is evaporated, and the mixture is crushed to below 40 meshes to obtain the lignin-derived env...

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Abstract

The invention relates to a lignin-derived environmentally-friendly viscosity reducer for a drilling fluid, and a preparation method thereof. The method comprises the following steps: mixing a lignin material with water in a reaction vessel at normal temperature; adding a metal salt into the reaction container according to a mass ratio of the metal salt to the lignin material is 1:(2-10); adding afoam inhibitor into the above mixed solution in the reaction container, and adding formaldehyde accounting for 0.1-3% of the mass of the lignin material into the mixed solution; and evaporating away the solvent of the mixture, and crushing the evaporated mixture to 40 meshes or below to obtain the product. The obtained product has a strong viscosity reduction effect, and the foaming effect of theproduct is eliminated, so that the product is suitable for field application.

Description

technical field [0001] The invention relates to the technical field of environment-friendly drilling fluid additives and applications, in particular to a method for preparing a lignin-derived viscosity reducer for environment-friendly drilling fluid. Background technique [0002] With the increase of world energy demand and the development of drilling technology, the number of deep wells and ultra-deep wells in my country is also increasing. During drilling, the deeper the wellbore, the higher the temperature inside the wellbore. Due to the automatic dispersion of clay particles in drilling fluid under high temperature conditions, the particle concentration increases and the specific surface area increases. The problem of high temperature thickening of drilling fluid becomes more and more prominent. The viscosity reducer is one of the indispensable drilling fluid treatment agents in the drilling process, and it plays a very important role in adjusting the rheology of the dr...

Claims

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Application Information

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IPC IPC(8): C09K8/20C09K8/035
CPCC09K8/203C09K8/035
Inventor 都伟超王想云张洁陈刚
Owner XI'AN PETROLEUM UNIVERSITY
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