Low Molecular Mass Organic Gelator Viscosification
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Solution Overview
Problem
Conventional viscosifiers used in subterranean treatment fluids often cause formation damage due to difficulty in complete removal and can lead to undesirable viscosity changes with temperature variations, affecting wellbore stability and fluid loss control.
Innovation Solution
The use of low molecular mass organic gelators that viscosify treatment fluids primarily through hydrogen bonding and supramolecular interactions, rather than covalent bonding, allowing for reversible viscosification and easy breakdown, reducing formation damage and maintaining stable viscosity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If conventional viscosifiers are used to increase treatment fluid viscosity, then viscosity is improved, but formation damage occurs due to difficulty in complete removal
Solution Approach 1:
The patent changes the molecular mass parameter of the viscosifier from high (conventional) to low (below 30,000 g/mol, preferably below 10,000 g/mol). This parameter change enables the viscosifier to maintain effective viscosity while being easily removable through the wellbore, thus preventing formation damage. The low molecular mass allows the viscosifier to pass through formation pores without causing plugging or permanent damage.
Solution Approach 2:
The patent employs a disposable, easily degradable viscosifier that performs its function temporarily during treatment and then breaks down into harmless components. The low molecular mass organic gelators used are designed to be readily biodegradable or hydrolyzable, allowing them to serve their viscosification purpose and then disappear without causing long-term formation damage, unlike conventional persistent viscosifiers.
2Stability of the object's composition
If conventional viscosifiers are used to maintain viscosity, then viscosity is improved, but viscosity changes with temperature variations affecting wellbore stability
Solution Approach 1:
The patent uses composite low molecular mass organic gelators that combine multiple functional groups and molecular structures to achieve temperature-insensitive viscosification. These composite molecules contain hydrophobic interactions, hydrogen bonding groups, and other supramolecular features that work synergistically to maintain stable viscosity across a wide temperature range, from cold wellbore conditions to high-temperature formation environments.
3Ease of operation
If low molecular mass organic gelators are used for viscosification, then ease of removal is improved, but viscosification effectiveness must be maintained
Solution Approach 1:
The patent optimizes the molecular mass parameter to a specific range (below 30,000 g/mol, preferably below 10,000 g/mol) that balances two opposing requirements: low enough to ensure easy removal and degradation, but high enough to maintain effective viscosification. This precise parameter control allows the viscosifier to form stable supramolecular structures for effective viscosity enhancement while remaining small enough to be easily transported out and degraded in the formation.
Solution Approach 2:
The patent replaces traditional mechanical/covalent bonding mechanisms (used by conventional viscosifiers) with supramolecular interactions (hydrogen bonding, hydrophobic effects, pi-pi stacking). These non-covalent interactions are reversible and weaker, allowing the viscosifier to easily break down and be removed after serving its purpose, while still providing sufficient viscosity enhancement during the treatment operation.
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 low molecular mass organic gelators provide effective viscosification for subterranean treatments, minimizing formation damage and ensuring stable viscosity across temperature variations, while being easily removable, thus enhancing wellbore stability and fluid control.
Implementation Method 1
The low molecular mass organic gelators that viscosify treatment fluids primarily through hydrogen bonding and supramolecular interactions
Implementation Method 2
The low molecular mass organic gelators that viscosify treatment fluids primarily through hydrogen bonding and supramolecular interactions
Implementation Method 3
allowing for reversible viscosification and easy breakdown
Implementation Method 4
allowing for reversible viscosification and easy breakdown
Data Source
AI summary
Compositions and methods of using such compositions to treat subterranean formations are provided. In one embodiment, the methods include providing a drilling fluid including an aqueous base fluid and a low molecular mass organic gelator; and using the drilling fluid to drill at least a portion of a wellbore that penetrates at least a portion of a subterranean formation. In certain embodiments, the methods include providing a drilling fluid including an aqueous base fluid and a low molecular mass organic gelator; and using the drilling fluid to drill at least a portion of a wellbore that penetrates at least a portion of a subterranean formation.