Oil Well Cement Settlement Stabilizer for High-Temperature Stability
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Solution Overview
Problem
Current oil well cement settlement stabilizers face challenges in maintaining stability at high temperatures, leading to issues like thinning and reduced viscosity, which affects the quality of cementing operations in deep and extra-deep wells.
Innovation Solution
A novel oil well cement settlement stabilizer is developed, comprising a ternary or quaternary polymer system with specific molar ratios of structural units, incorporating rigid hydrophobic monomers to ensure non-thickening at low temperatures and thickening at high temperatures, thereby enhancing stability and viscosity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If inorganic materials are used as settlement stabilizers, then temperature resistance is improved, but initial consistency becomes excessively high making pumping difficult
Solution Approach 1:
The patent uses a composite stabilizer system combining inorganic materials (attapulgite, bentonite) with organic polymers (xanthan gum, Welan gum) to achieve both temperature resistance and appropriate consistency for pumping operations
2Force
If natural high molecular polymers are used as settlement stabilizers, then viscosity is improved, but heat resistance deteriorates causing severe thinning at high temperature
Solution Approach 1:
The patent combines natural high molecular polymers (xanthan gum, Welan gum) with inorganic materials to create a composite stabilizer that maintains viscosity while resisting thermal degradation through synergistic effects
3Stability of the object's composition
If synthetic high molecular polymers are used as settlement stabilizers, then settlement stability is improved, but temperature sensitivity increases causing hydrolysis and thinning at high temperature
Solution Approach 1:
The patent combines synthetic high molecular polymers with inorganic stabilizers to create a composite system where the inorganic components provide temperature stability and prevent hydrolysis while the polymer maintains settlement stability
4Stability of the object's composition
If water-cement ratio is decreased to improve settlement stability, then settlement stability is improved, but initial consistency becomes excessively high increasing pumping difficulty
Solution Approach 1:
The patent introduces composite stabilizers (combining inorganic and organic components) as intermediaries to maintain settlement stability while allowing for lower water-cement ratios without excessive consistency increase
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 solution effectively prevents solid-phase formation and free liquid generation at high temperatures, improving the settlement stability of cement slurry and ensuring safe and high-quality cementing operations in high-temperature environments.
Implementation Method 1
mixing a monomer A, a monomer B, a monomer C, and a monomer D, and deionized water, and controlling them to have a copolymerization reaction in the presence of an initiator
Implementation Method 2
incorporating rigid hydrophobic monomers to ensure non-thickening at low temperatures and thickening at high temperatures
Implementation Method 3
the intensified Brownian movement of the molecules in the particles of the cement slurry at high temperature, which destroys the viscous force in the slurry and thins the slurry
Data Source
AI summary
An oil well cement settlement stabilizer is ternary cement settlement stabilizer or quaternary cement settlement stabilizer; wherein the quaternary cement settlement stabilizer containing structural units A represented by formula (I), structural units B represented by formula (II), structural units C represented by formula (III), and structural units D represented by formula (IV); Wherein the ternary cement settlement stabilizer containing structural units A represented by formula (I), structural units B represented by formula (II), and structural units D represented by formula (IV);