Energized Cement Slurry Gas Stabilizer
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Solution Overview
Problem
Current well cementing technologies face challenges in achieving optimal bonding and compressive strength of cement slurries, particularly in ensuring zonal isolation and preventing fluid migration in subterranean wells, where the existing methods do not adequately address the need for improved bonding and fluid-loss control.
Innovation Solution
The use of energized cement slurries comprising water, an inorganic cement, a gas generating agent, and a gas stabilizer, where the gas stabilizer includes polyglycols, oxyalkylates, methanol, or coco trimethyl ammonium chloride, which enhances compressive strength, accelerates strength development, and improves cement expansion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If gas generating agents are added to cement slurry to improve bonding and zonal isolation, then compressive strength and bonding performance are improved, but gas instability and fluid loss may occur
Solution Approach 1:
A gas stabilizer is introduced as an intermediary substance between the gas generating agent and the cement slurry. The gas stabilizer comprises surfactants and viscosity modifiers that stabilize the generated gas bubbles, preventing gas escape and maintaining slurry homogeneity, thereby resolving the contradiction between gas generation for strength improvement and gas stability for reliability
Solution Approach 2:
The cement slurry is formulated as a composite system combining inorganic cement, gas generating agents, and gas stabilizers (including surfactants and viscosity modifiers). This composite approach allows the system to simultaneously achieve improved compressive strength through gas generation while maintaining gas stability and preventing fluid loss through the stabilizing components
2Strength
If gas generating agents are used to energize cement slurry for improved bonding, then adhesion to casing and formation is enhanced, but fluid loss control becomes challenging
Solution Approach 1:
Viscosity modifiers and surfactants are introduced as intermediary substances that control fluid dynamics in the energized slurry. These additives increase slurry viscosity and stabilize the gas-liquid interface, preventing excessive fluid loss while maintaining the energizing effect for improved bonding strength
Solution Approach 2:
The slurry is formulated as a composite material system that includes fluid loss control additives alongside gas generating agents and stabilizers. This composite formulation achieves both improved bonding through gas generation and controlled fluid loss through the synergistic action of multiple functional components
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 described solution significantly improves the compressive strength, rate of strength development, and homogeneity of cement, leading to enhanced bonding and reduced fluid migration, thereby improving the overall performance of well cementing applications.
Implementation Method 1
a gas generating agent, wherein the gas generating agent releases hydrogen gas, carbon dioxide gas or nitrogen gas or a combination thereof
Implementation Method 2
a gas stabilizer comprises an aqueous mixture comprising polyglycols, oxyalkylates and methanol, or coco trimethyl ammonium chloride, or a mixture comprising ammonium fatty alcohol ether sulfate and ethylene glycol monobutyl ether
Data Source
AI summary
A well cementing composition comprises water, an inorganic cement, a gas generating agent and a gas stabilizer. The gas generating agent may contain materials that release hydrogen gas, carbon dioxide gas or nitrogen gas or combinations thereof. The gas stabilizer comprises an aqueous mixture comprising polyglycols, oxyalkylates and methanol, or coco trimethyl ammonium chloride, or a mixture comprising ammonium fatty alcohol ether sulfate and ethylene glycol monobutyl ether, or combinations thereof. When used to cement a subterranean well, the compositions improve the compressive strength, increase the rate at which compressive strength develops, preserve cement homogeneity, or enhance cement expansion or a combination thereof.