Non-sulfonated Melamine Resin Drilling Fluid Viscosity Reducer
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Solution Overview
Problem
Existing viscosity reducers for drilling fluids in high-temperature deep wells face challenges due to insufficient temperature resistance and the presence of sulfur, which restricts their environmental sustainability and performance.
Innovation Solution
A non-sulfonated melamine resin viscosity reducer is developed, comprising a specific composition and preparation method that includes polycondensation and amidation steps, allowing for effective viscosity reduction and temperature resistance without sulfur.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If traditional viscosity reducers (sulfonated tannins, iron-chromium lignosulfonate) are used, then viscosity reduction effect is achieved, but sulfur content increases and environmental sustainability deteriorates
Solution Approach 1:
The patent extracts and eliminates the sulfur component from traditional viscosity reducer formulations while maintaining the essential viscosity reduction function through non-sulfonated melamine resin-based alternatives, thus resolving the contradiction between achieving viscosity reduction and avoiding sulfur content
Solution Approach 2:
The patent changes the chemical composition parameters by replacing sulfonated groups with non-sulfonated melamine resin structures, fundamentally altering the molecular basis of viscosity reduction while eliminating sulfur, thereby resolving the environmental sustainability issue
2Reliability
If sulfonated materials are used for viscosity reduction, then viscosity control is improved, but environmental protection requirements are violated
Solution Approach 1:
The patent converts the harmful sulfur-containing sulfonated materials into beneficial non-sulfonated melamine resin-based viscosity reducers that meet environmental protection requirements while maintaining reliable viscosity control performance
Solution Approach 2:
The patent develops composite viscosity reducer systems using non-sulfonated melamine resin combined with other environmentally friendly additives, creating a composite material that achieves both reliable viscosity control and environmental compliance
3Stress or pressure
If high-density drilling fluids are used for high-pressure formation environments, then formation pressure balancing is improved, but viscosity control becomes more difficult
Solution Approach 1:
The patent introduces non-sulfonated melamine resin-based viscosity reducers as intermediary substances that mediate between the high-density drilling fluid and the formation pressure conditions, enabling effective viscosity control even in high-pressure environments
4Stress or pressure
If drilling fluid density is increased for high-pressure environments, then formation pressure balancing is achieved, but temperature resistance becomes insufficient
Solution Approach 1:
The patent creates composite drilling fluid systems combining non-sulfonated melamine resin viscosity reducers with other temperature-resistant additives, forming a composite material system that simultaneously achieves formation pressure balancing and high-temperature resistance
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 non-sulfonated melamine resin viscosity reducer demonstrates a viscosity reduction rate of not less than 90% and temperature resistance up to 240°C, while also reducing filtrate loss and ensuring environmental compliance.
Implementation Method 1
the melamine, tannin extract, and lignin undergo polycondensation under the action of formaldehyde to form polycondensation macromolecules
Implementation Method 2
The exposed carboxyl group of the maleic anhydride in the macromolecule formed by the polycondensation undergoes amidation with the amino group of the alcoholamine
Implementation Method 3
The non-sulfonated melamine resin viscosity reducer of the present disclosure could be directly adsorbed on clay particles or other solid particles, releasing water as the mobile phase
Data Source
AI summary
Provided are a non-sulfonated melamine resin viscosity reducer for a drilling fluid and a preparation method thereof. The non-sulfonated melamine resin viscosity reducer for the drilling fluid includes the following raw materials in parts by mass: 100 parts to 150 parts of water, 80 parts to 100 parts of melamine, 20 parts to 30 parts of formaldehyde, 50 parts to 80 parts of a tannin extract, 40 parts to 60 parts of lignin, 20 parts to 40 parts of maleic anhydride, 0.1 parts to 0.3 parts of a catalyst, 1 part to 3 parts of triethanolamine (TEA), and 10 parts to 20 parts of alcoholamine; wherein the alcoholamine is one or more selected from the group consisting of monoethanolamine (MEA), diethanolamine (DEA), diglycolamine (DGA), isopropanolamine (IPA), and diisopropanolamine (DIPA).