Amine Salt Clay Stabilizer for Wellbore Fluids
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Solution Overview
Problem
Current clay stabilizing methods are ineffective in providing permanent solutions for clay swelling and migration in heterogeneous hydrocarbon-bearing shale formations, as they are often temporary and fail to address the unique characteristics of various clay types, leading to formation damage and reduced hydrocarbon production.
Innovation Solution
A combination of two or more amine salts with different molecular weights and configurations is used for cation exchange, allowing for universal protection against clay swelling and restoration of permeability in formations, capable of operating across a broad pH range and effective in various pore spaces, including micropore, mesopore, and macropore spaces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single clay stabilizing agent is used, then the treatment is simple and cost-effective, but it fails to provide permanent stabilization and is ineffective against heterogeneous clay types
Solution Approach 1:
The patent applies composite materials by combining multiple amine salts with different molecular weights and configurations into a single treatment composition. This composite approach allows the formulation to interact with diverse clay types simultaneously, providing permanent stabilization that single agents cannot achieve. The composite nature of the treatment enables it to address heterogeneous clay formations effectively.
Solution Approach 2:
The patent implements universality by designing a multi-component amine salt composition that can stabilize various clay types (smectite, vermiculite, illite, kaolinite) with a single treatment application. The different amine salts in the composition serve multiple functions: some penetrate micropores, others target mesopores and macropores, creating a universal solution that works across diverse clay mineralogies without requiring separate treatments for each clay type.
2Reliability
If conventional clay stabilizing methods are used, then the application is straightforward, but the stabilization is temporary and ineffective against clay migration
Solution Approach 1:
The patent applies parameter changes by utilizing amine salts with varying molecular weights, configurations, and ionic strengths. These parameter variations enable the composition to penetrate different pore size distributions and provide permanent stabilization. The different molecular parameters allow the treatment to effectively reach and stabilize clays in micropore, mesopore, and macropore spaces, preventing both swelling and migration permanently.
Solution Approach 2:
The patent implements segmentation by dividing the treatment composition into multiple amine salt components, each optimized for specific pore sizes and clay types. This segmentation allows the treatment to simultaneously address different formation characteristics without requiring multiple separate applications, maintaining ease of operation while achieving permanent stabilization through the coordinated action of segmented components.
3Adaptability or versatility
If a broad pH range treatment is used, then the treatment is versatile for different formation conditions, but the formulation complexity increases
Solution Approach 1:
The patent implements universality by selecting amine salts that maintain effective cation exchange capability across a broad pH range (approximately pH 3 to pH 11). This multi-functional approach allows the single composition to adapt to different formation pH conditions without requiring pH-specific formulations, achieving versatility while keeping the formulation relatively simple through careful component selection.
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 amine salt combination provides substantial and permanent stabilization of clays, effectively preventing swelling and migration, restoring permeability, and enhancing hydrocarbon production by adapting to the diverse clay types and conditions encountered in shale formations.
Implementation Method 1
A combination of two or more amine salts capable of cation exchange are used
Data Source
AI summary
A clay stabilizer which is capable of inhibiting swelling in a wide variety of clay types and is also capable of restoring permeability in formations which have previously been damaged by clay swelling. Amine salts of differing molecular weights configurations and ionic strength are combined to provide transport into micropores, mesopores and macropores in the formation and to effect cationic change therein. A poly quaternary amine having a high to very high charge density is added along with lower molecular weight amine salts to substantially permanently exchange cations with the clay in the formation.