Amphoteric Polysaccharide Viscosifier for Drilling Fluids
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Solution Overview
Problem
Conventional viscosifiers used in drilling and fracturing fluids require high concentrations, are prone to uneven wetting, and are affected by ions in water, leading to high transportation costs, inefficient preparation, and reduced effectiveness in subterranean formations.
Innovation Solution
A hydrophobically and hydrophilically modified polysaccharide (HHMP) is used to increase viscosity of drilling fluids, allowing for lower viscosifier concentrations, improved wetting, and stability in ion-containing waters, reducing transportation costs and preparation time while maintaining effective performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional viscosifiers are used to achieve high viscosity in drilling fluids, then sufficient viscosity is obtained to suspend proppant, but high concentrations are required leading to high transportation costs and inefficient preparation
Solution Approach 1:
The patent applies parameter changes by modifying the chemical structure of polysaccharides through hydrophobic and hydrophilic grafting. This structural modification changes the interaction parameters between polymer chains and solvent, enabling much higher viscosity at lower concentrations. The dual-natured polysaccharides form more efficient viscous networks in the fluid, resolving the contradiction between achieving high viscosity and reducing viscosifier quantity.
Solution Approach 2:
The invention uses composite materials by creating graft copolymers that combine hydrophobic and hydrophilic segments within the same polymer chain. This composite structure allows the viscosifier to interact more effectively with the drilling fluid components, providing superior viscosity enhancement per unit concentration compared to conventional single-nature viscosifiers, thus reducing the required quantity while maintaining high viscosity.
2Strength
If conventional viscosifiers are mixed with liquids, then viscosity is provided, but uneven wetting occurs forming lumps or fish eyes requiring longer mixing times or more sophisticated mixing equipment
Solution Approach 1:
The patent applies local quality by creating polysaccharide chains with locally distinct hydrophobic and hydrophilic regions. This local differentiation in chemical properties within the polymer structure enables uniform interaction with both polar and non-polar components of the drilling fluid, preventing lump formation and ensuring even wetting throughout the mixture, thereby simplifying the manufacturing process.
Solution Approach 2:
The invention achieves homogeneity through the amphoteric nature of the modified polysaccharides, which contain both hydrophobic and hydrophilic groups that can uniformly interact with diverse fluid components. This dual-natured structure promotes homogeneous distribution and wetting throughout the drilling fluid, eliminating the fish eyes and lumps characteristic of conventional viscosifiers, and reducing mixing time and equipment complexity.
3Strength
If conventional viscosifiers are used in ion-containing water, then viscosity is reduced or degraded, but obtaining fresh water increases transportation costs and limits the number of formations that can be treated
Solution Approach 1:
The patent applies parameter changes by modifying the chemical parameters of polysaccharides to create amphoteric structures with both hydrophobic and hydrophilic characteristics. This structural parameter change enables the viscosifier to maintain stable viscosity in the presence of various ions, as the dual-natured polymer can adapt its conformation and interaction modes to counteract ionic effects, thus expanding adaptability to different water sources including brine and seawater.
Solution Approach 2:
The invention achieves universality through amphoteric polysaccharides that can function effectively across a wide range of environmental conditions, including varying ion concentrations, temperatures, and fluid compositions. The dual hydrophobic-hydrophilic structure provides multi-functionality, allowing the viscosifier to maintain performance in both fresh and salt water, thereby eliminating the need for separate viscosifier systems and expanding the versatility of drilling operations to previously inaccessible formations.
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
HHMP provides higher viscosity with lower viscosifier concentrations, improved wetting, and stability across various solvents, resulting in more efficient and cost-effective drilling and fracturing operations, even in ion-rich environments.
Implementation Method 1
hydrophobically and hydrophilically modified polysaccharide (HHMP)
Implementation Method 2
hydrophobically and hydrophilically modified polysaccharide (HHMP)
Implementation Method 3
improved wetting
Data Source
AI summary
Hydrophobically and hydrophilically modified polysaccharides and methods of using the same for treatment of a subterranean formation. A method of treating a subterranean formation. The method includes obtaining or providing a composition including a hydrophobically and hydrophilically modified polysaccharide (HHMP). The method includes placing the composition in a subterranean formation.