Ultra-High Temperature Cement Slurry Stabilizer
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Solution Overview
Problem
Existing ultra-high temperature cement slurry systems face challenges with poor stability and strength decline at high temperatures, leading to annular blockage, reduced sealing effectiveness, and increased risk of wellbore failure in deep and ultra-deep wells.
Innovation Solution
The development of an ultra-high temperature resistant cement slurry system comprising 100 parts of cement, 15-50 parts of ultra-high temperature strength stabilizer, 15-50 parts of ultra-high temperature reinforcing material, and specific additives such as an ultra-high temperature suspension stabilizer, fluid loss additive, and retarder, which maintains excellent settlement stability and prevents strength decline up to 240°C.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If high temperature stabilizers (inorganic or polymer) are added to improve settlement stability, then thickening effect is improved, but initial slurry consistency increases making ash discharging and pumping difficult
Solution Approach 1:
The patent uses ether-based starch with specific chemical structure (introducing bulky ether groups) that provides thickening effect without excessive viscosity increase. The molecular structure parameters of the starch are optimized to maintain stability while ensuring pumpability
Solution Approach 2:
The patent combines ether-based starch with aluminosilicate and polyalcohol polymer to create a composite stabilizer system. This composite approach balances the thickening effect with fluidity, achieving both settlement stability and ease of pumping through synergistic interaction of components
2Stability of the object's composition
If natural polymer high temperature stabilizers are used to improve viscosity and settlement stability, then cost is reduced and source is widened, but viscosity decreases significantly at high temperature reducing anti-settling ability
Solution Approach 1:
The patent modifies starch through etherification to create ether-based starch with enhanced thermal stability. The ether groups introduce steric hindrance and hydrogen bonding that prevent molecular degradation at high temperatures, maintaining viscosity and settlement stability up to 240°C
Solution Approach 2:
The ether-based starch acts as an intermediary between natural starch and the harsh high-temperature environment. The ether groups serve as protective intermediaries that prevent direct thermal degradation of the polymer chain, preserving the stabilizing function at elevated temperatures
3Temperature
If inorganic high temperature stabilizers are used to improve temperature resistance and avoid degradation, then stability is improved, but thickening side effects increase making operation difficult
Solution Approach 1:
The patent modifies the chemical parameters of starch through etherification, introducing ether groups that provide thermal stability comparable to inorganic stabilizers without the excessive thickening side effects. The molecular weight and structure are optimized to balance temperature resistance with fluidity
Solution Approach 2:
The patent replaces expensive or operationally problematic inorganic stabilizers with ether-based starch that provides equivalent temperature resistance at lower cost and with better operational characteristics, effectively substituting a superior material
4Temperature
If cement slurry is used for ultra-high temperature cementing, then deep well exploration is enabled, but strength of cement stone declines at ultra-high temperature affecting wellbore life
Solution Approach 1:
The patent adds ultra-high temperature strength stabilizer and reinforcing material to change the chemical and physical parameters of the cement slurry system. These additives modify the hydration products and microstructure of cement stone to maintain strength at ultra-high temperatures up to 240°C
Solution Approach 2:
The patent creates a composite cement slurry system combining cement with ultra-high temperature strength stabilizer and reinforcing material. This composite formulation ensures both temperature resistance and strength retention, solving the fundamental limitation of conventional cement at ultra-high temperatures
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 system achieves strong temperature resistance, improved settlement stability, and enhanced compressive strength of cement stone, ensuring effective cementing and sealing in deep and ultra-deep wells even at ultra-high temperatures.
Implementation Method 1
Synthetic polymer high temperature stabilizers have stable performance and are easy to regulate. It can effectively improve the viscosity of the slurry, and significantly improve the settlement stability of cement slurry.
Implementation Method 2
the long-term strength of cement stone under high temperature would decline, the sealing effect is poor
Implementation Method 3
15-50 parts of ultra-high temperature reinforcing material
Data Source
AI summary
An ultra-high temperature resistant cement slurry system comprising cement, an ultra-high temperature strength stabilizer, an ultra-high temperature reinforcing material, a density regulator, an ultra-high temperature suspension stabilizer, a dispersant, a fluid loss additive, a retarder, a defoaming agent and water, wherein the ultra-high temperature suspension stabilizer comprises an ether-based starch, an aluminosilicate and a polyalcohol polymer. The method for preparing the cement slurry system includes dry mixing and wet mixing raw materials homogeneously, respectively, and then homogeneously mixing the dry mix and wet mix to obtain the cement slurry system. The cement slurry system can be used for cementing in deep wells and ultra-deep wells at high and ultra-high temperatures.