Water-Lock Releasing Agent Composition for Wettability and Viscosity Control
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Solution Overview
Problem
Existing water-lock releasing agents for oil and gas reservoirs are costly, have poor performance stability, and fail to effectively reduce surface tension, regulate wettability, and viscosity, leading to inadequate elimination of water-lock and liquid-lock damage.
Innovation Solution
A water-lock releasing chemical agent combining anionic fluorosurfactant and zwitterionic surfactant, with a synergistic auxiliary, to reduce surface tension, adjust wettability, and lower viscosity, enhancing the discharge of blocked fluids in oil and gas reservoirs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional water-lock releasing agents are used, then the surface tension reduction effect is achieved, but the cost increases and performance stability deteriorates
Solution Approach 1:
The patent combines anionic fluorosurfactant and zwitterionic surfactant in a specific ratio (1:0.5 to 1:2) to create a composite chemical agent. This composite formulation achieves both cost-effectiveness and performance stability by leveraging the complementary properties of the two surfactant types, resolving the contradiction between conventional single-component agents that are either expensive or unstable
Solution Approach 2:
The patent optimizes the concentration ratio of anionic fluorosurfactant to zwitterionic surfactant within specific ranges (anionic fluorosurfactant: 1-40%, zwitterionic surfactant: 0.5-20%) to achieve the best balance between cost and performance stability. This parameter optimization ensures consistent performance while maintaining economic viability
2Reliability
If single surfactant systems are used, then the formulation is simple, but the surface tension reduction and wettability regulation capabilities are insufficient
Solution Approach 1:
The patent employs a composite surfactant system combining anionic fluorosurfactant and zwitterionic surfactant, which together achieve superior surface tension reduction and wettability regulation compared to single surfactant systems. The synergistic interaction between the two surfactant types provides enhanced performance while maintaining reasonable formulation complexity
Solution Approach 2:
The patent merges the properties of anionic fluorosurfactant (excellent surface activity) and zwitterionic surfactant (good wettability regulation) into a unified chemical agent formulation. This combination allows the system to simultaneously achieve low surface tension and effective wettability control, overcoming the limitations of single-component systems
3Reliability
If high surface activity agents are used, then the surface tension is reduced effectively, but the viscosity reduction and wettability regulation performance are poor
Solution Approach 1:
The patent uses a composite surfactant system where the anionic fluorosurfactant provides high surface activity for surface tension reduction, while the zwitterionic surfactant contributes to wettability regulation and viscosity reduction. This composite approach ensures that all three key functions (surface tension reduction, wettability regulation, and viscosity reduction) are achieved simultaneously
Solution Approach 2:
The patent optimizes the concentration parameters of both surfactant components to achieve the desired balance between surface activity and viscosity reduction. By controlling the ratio and concentration levels within specified ranges, the formulation achieves effective wettability regulation without excessive viscosity, resolving the trade-off between surface activity and fluidity
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 agent effectively reduces surface tension to less than 20mN/m, adjusts strongly water-wettable surfaces to neutral, and improves fluidity, promoting the discharge of blocked fluids, thus effectively eliminating water-lock and liquid-lock damage with improved stability and cost-effectiveness.
Implementation Method 1
The water-lock releasing chemical agent provided by the present invention can reduce the surface tension of water, adjust a matrix surface having a strongly water wettability to neutral wettability
Implementation Method 2
adjust a matrix surface having a strongly water wettability to neutral wettability
Implementation Method 3
have an effect of reducing fluid viscosity, and therefore can effectively eliminate the damage caused by water-lock and liquid-lock
Data Source
AI summary
The present invention provides a water-lock releasing chemical agent for oil and gas reservoirs, preparation method therefor and use thereof. The water-lock releasing chemical agent for oil and gas reservoirs is prepared from raw materials comprising an anionic fluorosurfactant, a zwitterionic surfactant, a synergistic auxiliary and a solvent; based on 100% of the total weight of the water-lock releasing chemical agent for oil and gas reservoirs, the anionic fluorosurfactant comprises 1%-40%, the zwitterionic surfactant comprises 1%-40%, the synergistic auxiliary comprises 0.5%-20%, and the balance is the solvent. The components of the prepared water-lock releasing chemical agent interact with each other and enhance the synergy so as to greatly reduce the surface tension of water. The water-lock releasing chemical agent can adjust a matrix surface having a strongly water wettability to neutral wettability, and has lower apparent viscosity, lower cost and better stability.