Cellulose Fiber Additive for Drilling Mud
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Solution Overview
Problem
Existing drilling mud modifiers face challenges with viscosity degradation under high-temperature and high-shear conditions, leading to reduced flowability and environmental concerns due to synthetic polymers like acrylamide.
Innovation Solution
The use of cellulose fibers with a number-average diameter of 2 to 500 nm and a fiber aspect ratio of 50 or more, chemically modified with oxidized hydroxyl groups, provides high heat and mechanical shear resistance while maintaining pseudoplastic flowability and biodegradability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If synthetic polymers such as acrylamide are used to increase viscosity for enhancing water retentiveness, then flowability may lower and environmental load increases, but the patent seeks to maintain both flowability and environmental friendliness
Solution Approach 1:
The patent changes the physical parameters of cellulose fibers (diameter to 2-500 nm, aspect ratio to 50 or more) to achieve optimal performance. This precise parameter control allows the additive to provide water retentiveness while maintaining flowability, resolving the contradiction between these two properties
Solution Approach 2:
The patent uses chemically modified cellulose fibers that combine natural cellulose with specific chemical groups (carboxyl, aldehyde, or ketone) to create a composite material with superior properties. This composite structure provides both water retentiveness and flowability while being environmentally friendly
2Quantity of substance
If viscosity is increased to enhance water retentiveness, then flowability may lower, but the patent aims to maintain high flowability during discharging
Solution Approach 1:
The patent employs pseudoplastic cellulose fibers that exhibit shear-thinning behavior, where viscosity decreases under high shear conditions (during pumping and discharging) but maintains high viscosity at rest (for water retentiveness). This dynamic parameter change resolves the contradiction between water retentiveness and flowability
3Quantity of substance
If conventional additives are used, then initial viscosity may be sufficient, but viscous property degrades under high-temperature and high-shear conditions
Solution Approach 1:
The patent uses chemically modified cellulose fibers with enhanced structural stability. The chemical modifications (oxidation of hydroxyl groups) create more stable molecular structures that resist degradation under high temperature and shear conditions, maintaining viscous properties throughout the drilling process
Solution Approach 2:
The patent uses naturally-derived cellulose fibers that are biodegradable and environmentally friendly, replacing synthetic polymers that persist in the environment. While natural cellulose can be less stable, the chemical modifications enhance its durability without compromising biodegradability
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The cellulose fiber additive maintains viscosity and flowability under extreme conditions, is environmentally friendly, and enhances drilling mud performance by forming a rigid crystal structure.
Implementation Method 1
having a cellulose I-type crystal structure
Implementation Method 2
a hydroxyl group on a surface of the cellulose fibers has been chemically modified
Implementation Method 3
the aldehyde group and the ketone group formed through the oxidation reaction
Implementation Method 4
the aldehyde group and the ketone group formed through the oxidation reaction have been reduced with a reducing agent
Data Source
AI summary
To provide an additive for drilling mud, used in drilling for petroleum, natural gas, civil engineering, mines, etc., which has high heat resistance and high mechanical shear resistance, of which the viscous property does not degrade even under high-temperature and high-shear conditions; has high pseudoplastic flowability and therefore secures high flowability during discharging; and is a naturally-derived one and is therefore highly biodegradable and has least adverse impact on environment. An additive for drilling mud, which contains cellulose fibers having a number-average fiber diameter of from 2 to 500 nm and a fiber aspect ratio of 50 or more and having a cellulose I-type crystal structure.