Sol-Gel Binder Stability Under Hydrothermal Conditions
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Solution Overview
Problem
Hybrid materials based on sol-gel processes are sensitive to bases and hydrothermal conditions, leading to rapid decomposition and instability under elevated pressure and temperature, making them unsuitable for applications like consolidating loose formations in petroleum production.
Innovation Solution
A method where metal or boron-containing components are added to the sol after the hydrolysis of silicon compounds, preventing the formation of metal oxides and allowing for homogeneous distribution, thereby enhancing the stability and corrosion resistance of the binder.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If hybrid materials based on sol-gel processes are used, then mechanical properties and low-temperature compaction are improved, but stability under hydrothermal conditions deteriorates
Solution Approach 1:
The patent uses a composite binder system combining organometallic compounds (aluminum, titanium, zirconium alkoxides) with organic polymers (epoxy resins, polyesters). This composite approach creates a hybrid material that exhibits both the mechanical advantages of organic polymers and the thermal/chemical stability of inorganic metal oxides, resolving the contradiction between mechanical properties and hydrothermal stability.
Solution Approach 2:
The patent modifies the chemical composition parameters of the binder by incorporating specific metal alkoxides (Al, Ti, Zr) with controlled ratios and molecular weights of organic polymers. These parameter changes enable the binder to maintain mechanical integrity while resisting hydrothermal degradation, as the metal oxides formed provide thermal stability while the organic matrix provides flexibility.
2Object-affected harmful factors
If organic polymer chains are incorporated into silicate networks, then alkali resistance is improved, but decomposition under hydrothermal conditions worsens
Solution Approach 1:
The patent creates a composite structure where organic polymer chains are embedded within an inorganic metal oxide network. The metal oxides (Al2O3, TiO2, ZrO2) provide resistance to alkali and hydrothermal attack, while the organic polymer phase maintains flexibility and processability. This composite architecture allows the material to resist both alkali and hydrothermal degradation simultaneously.
Solution Approach 2:
The metal alkoxides act as intermediary components that bridge the organic and inorganic phases. During curing, they hydrolyze to form metal oxide networks that interpenetrate with the organic polymer matrix, creating a stable interface that protects both phases from degradation. This intermediary structure enables the organic component to contribute to alkali resistance while the inorganic component provides hydrothermal stability.
3Stability of the object's composition
If silicon-oxygen-silicon bonds are formed through condensation, then inorganic network stability is improved, but reversibility under high water vapor pressure and temperature worsens
Solution Approach 1:
The patent replaces the reversible Si-O-Si bonds with metal oxide bonds (Al-O, Ti-O, Zr-O) that form a more stable inorganic network. These metal-oxygen bonds have higher bond energies and are less susceptible to hydrolysis under high water vapor pressure and temperature. The composite structure maintains network stability while reducing bond reversibility.
Solution Approach 2:
The patent changes the chemical composition from silicon-based to metal-based (Al, Ti, Zr) oxides, fundamentally altering the bond characteristics. The metal-oxygen bonds formed have different thermodynamic stability and hydrolysis resistance compared to silicon-oxygen bonds, providing improved stability under harsh hydrothermal conditions while maintaining network integrity.
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 binder achieves significant improvement in corrosion resistance and compressive strength, remaining stable under hydrothermal conditions, making it suitable for use in consolidating sand-containing formations.
Implementation Method 1
after the hydrolysis of silicon compounds
Data Source
AI summary
A process for preparing a binder comprising a heterocondensate of silicon compounds and metal or boron compounds, in which a hydrolysable silicon compound having a nonhydrolysable polymerizable group as Si component is mixed with water to form a hydrolysis product and a metal or boron compound in which the metal is selected from among Al, Ga, In, Tl, Ge, Ga, Sn, Pb, Ti, Zr, Hf, Sc, Y and La is then added to the hydrolysis product at a point in time which is in the range from 15 s to 15 min after mixing of the hydrolysable silicon compounds with the water, is described. This gives homogeneous heterocondensates which when used as binders give excellent resistance and strength. The binders are highly suitable for strengthening geological formations and beds of granular material which are used in oil and gas recovery to keep the sources open.