Cationic Hydrogel Particles for Water Permeation Blocking
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Solution Overview
Problem
Existing methods for inhibiting water permeation in hydrocarbon extraction wells are ineffective due to short-lived results, poor selectivity towards reservoir water, and instability in high saline conditions, leading to reduced hydrocarbon extraction efficiency and increased operational costs.
Innovation Solution
A treatment fluid comprising a micrometric or nanometric dispersion of an aqueous phase in oil, where the aqueous discontinuous phase contains particles of a hydrogel with chains of cationic polymers, which selectively absorb reservoir water, modifying the rock formation's permeability and blocking water permeation into the extraction well.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If chemical compounds (polymers, gels, foams) are injected to form mechanical barriers impermeable to water, then water permeation is blocked, but the effect is short-lived requiring frequent re-injections
Solution Approach 1:
The patent changes the chemical parameter of the polymer by introducing a gradient in hydrophobicity along the polymer chain. The polymer contains both hydrophilic segments (for water interaction) and hydrophobic segments (for oil compatibility and reservoir rock affinity), creating a balanced material that provides long-term water permeation inhibition without requiring frequent re-injections
Solution Approach 2:
The patent creates a composite polymer structure combining hydrophilic and hydrophobic segments within the same polymer chain. This composite structure allows the polymer to simultaneously interact with water (blocking permeation) and compatibilize with oil and reservoir rock, resulting in durable water shut-off effects
2Reliability
If chemical compounds are injected to block water paths, then water permeation is reduced, but the compounds lack selectivity and interact with irreducible water and emulsified water, reducing hydrocarbon mobility
Solution Approach 1:
The patent applies local quality by creating distinct functional segments within the polymer chain: hydrophilic segments are positioned to interact specifically with reservoir water in pore spaces, while hydrophobic segments interact with oil and rock surfaces. This localized functional distribution enables selective water blocking without affecting hydrocarbon mobility
Solution Approach 2:
The patent changes the chemical parameter of the polymer by introducing a gradient in hydrophobicity along the polymer chain. This parameter variation enables the polymer to differentiate between water phases (reservoir water versus irreducible and emulsified water) and selectively interact only with reservoir water, preserving hydrocarbon mobility
3Reliability
If treatment fluids are injected frequently to maintain water permeation inhibition, then water blocking is maintained, but production capacity is reduced due to operational interruptions
Solution Approach 1:
The patent applies partial action by using a polymer with optimized hydrophobicity-hydrophilicity balance that provides sufficient water blocking effectiveness without requiring excessive injection frequencies. The polymer's dual-character structure enables it to achieve durable water shut-off with minimal operational interruptions, optimizing the balance between water blocking and production maintenance
4Reliability
If polymers with high water affinity are used to block water, then water permeation is inhibited, but the polymers are unstable in high saline conditions
Solution Approach 1:
The patent creates a composite polymer structure combining hydrophilic segments (for water interaction) and hydrophobic segments (for oil compatibility and reservoir rock affinity). This composite structure provides both water permeation blocking effectiveness and stability in high saline conditions by balancing polar and non-polar interactions
Solution Approach 2:
The patent changes the chemical parameter of the polymer by introducing a gradient in hydrophobicity along the polymer chain. This parameter variation enables the polymer to maintain structural stability in high saline environments while retaining water-binding capability, overcoming the instability issue of highly hydrophilic polymers
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 method effectively reduces water-cut in extraction wells, is stable across a wide range of salinity levels, and provides a more lasting and tenacious placement of the polymeric material in the reservoir, enhancing hydrocarbon extraction efficiency and reducing operational disruptions.
Implementation Method 1
particles of a hydrogel with chains of cationic polymers, which selectively absorb reservoir water, modifying the rock formation's permeability
Data Source
AI summary
A treatment fluid may be suitable for a hydrocarbon fluid extraction well. Such a treatment fluid may include a water-in-oil emulsion. The water-in-oil emulsion may include: an oily continuous phase; and an aqueous discontinuous phase comprising water and a plurality of particles comprising a hydrogel comprising a cationic polymer. The cationic polymer may include, in polymerized form, a monomer with one or more cationic groups. The cationic group may be a —N+—R1R2R3 group, wherein R1, R2, and R3, are independently H or a C1 to C4 alkyl group.