Polyamine-Derived Cationic Compounds for Clay Stabilization
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Solution Overview
Problem
Current clay stabilizers in oil and gas operations are not ideal for all subterranean formations, as they can cause formation damage, interfere with other stimulation fluid ingredients, and provide only temporary protection against clay swelling, migration, and sludge formation.
Innovation Solution
The use of multiple charged cationic compounds derived from polyamines through an aza-Michael Addition reaction with α, β-unsaturated carbonyl compounds, which serve as effective clay stabilizers, coagulants, water clarifiers, corrosion inhibitors, and reverse emulsion breakers, reducing clay swelling, migration, and sludge formation while minimizing chemical usage and operational complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of stationary object
If polymeric cationic materials are used as clay stabilizers, then long-lasting protection against clay swelling is achieved, but formation damage occurs due to high molecular weight causing plate-out on formation face
Solution Approach 1:
The patent changes the molecular weight parameter of cationic polymers from high (conventional) to low (500-50,000 Da), transforming the physical state from plate-forming to soluble, thereby eliminating formation damage while maintaining clay stabilization efficacy through multiple positive charges
2Object-affected harmful factors
If simple single charged clay stabilizers are used, then temporary protection against clay swelling is provided without adverse effects, but they are easily washed away via ion exchange
Solution Approach 1:
The patent creates a composite structure by combining multiple cationic charges on a single low molecular weight polymer chain, integrating the temporary protection advantage with enhanced retention through multi-point attachment to clay surfaces
Solution Approach 2:
The patent changes the charge density parameter by incorporating multiple cationic groups per molecule, transforming the interaction mechanism from single-point to multi-point attachment, thereby increasing retention time while maintaining compatibility with stimulation fluids
3Object-affected harmful factors
If multiple chemicals are used for clay stabilization, coagulation, water clarification, and corrosion inhibition, then comprehensive protection is achieved, but operational complexity increases
Solution Approach 1:
The patent designs a universal low molecular weight cationic polymer that simultaneously performs clay stabilization, coagulation, water clarification, and corrosion inhibition through its multiple cationic charges and appropriate functional groups, replacing multiple specialized chemicals with a single multi-functional agent
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
These compounds provide superior performance in preventing clay swelling and migration, offering long-lasting protection and multi-functional benefits, reducing the need for multiple chemicals and simplifying operations.
Implementation Method 1
multiple charged cationic compounds derived from polyamines for preventing clay swelling, clay migration and/or sludge formation
Data Source
AI summary
Multiple charged cationic compounds, which are derived from polyamines through an aza-Michael addition with an α, β-unsaturated carbonyl compound, in a clay treatment composition to reduces clay swelling, clay migration, and sludge formation in a subterranean formation in oil and gas operations are provided. The disclosed methods or compositions are found to be more effective than those methods or compositions commonly used for reducing clay swelling, clay migration, and sludge formation.