Modified Graphite Particle System for Oil Displacement
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Solution Overview
Problem
In water-flooding oil fields, long-term extraction leads to non-homogeneous strata and decreased efficiency, causing remaining oil to be unrecovered, as polymer-based displacement systems suffer from weakened viscosity and mobility control under shearing actions and physicochemical influences, resulting in rapid pressure drop and limited displacement effect.
Innovation Solution
A modified graphite particle system is introduced, comprising dispersed graphite particles, a dispersant, and a wettability modifier, which enhances mobility regulation and injection pressure by improving the compatibility and stability of polymer/binary/ternary composite oil displacement systems, allowing for deeper oil recovery and sustained flooding efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If polymer-based displacement systems are used to increase viscosity and improve oil displacement efficiency, then oil recovery factor is improved, but viscosity is severely decreased and mobility control ability is weakened under shearing actions and physicochemical influences
Solution Approach 1:
The patent combines polymer with graphite particles to form a composite displacement system. The graphite particles (0.1-5.0 wt%) provide structural stability and maintain viscosity under shearing conditions, while the polymer provides the base viscosity enhancement. This composite approach allows the system to maintain both high oil recovery factor and stable mobility control ability throughout the displacement process.
2Productivity
If polymer-based composite oil displacement systems are used to improve swept volume, then oil displacement efficiency is improved, but injection pressure drops quickly and displacement effect is limited in follow-up water flooding stage
Solution Approach 1:
The patent modifies the physical and chemical parameters of the displacement system by adding graphite particles that alter the flow characteristics. The graphite particles increase the system's resistance to flow degradation, maintaining injection pressure stability. This parameter modification allows the system to sustain effective injection pressure throughout the follow-up water flooding stage, preventing rapid pressure drop and extending the effective displacement period.
3Productivity
If alkali is added to enhance oil displacement effect through reaction with petroleum acids, then surfactant production and oil displacement efficiency are improved, but system complexity increases
Solution Approach 1:
The patent extracts and utilizes the beneficial chemical reaction between alkali and petroleum acids to generate surfactant in-situ, while eliminating the need for separate surfactant addition systems. The graphite particles enhance this natural surfactant generation process and provide additional mobility control, simplifying the overall system architecture while maintaining high oil displacement efficiency through the combined chemical and physical mechanisms.
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 modified graphite particle system significantly improves the oil displacement efficiency and recovery factor by maintaining high injection pressure and mobility control, enabling effective long-term exploitation of remaining oil reserves.
Implementation Method 1
modified graphite particle system, which can be dispersed in water-based fluids, is environment-friendly, stable in a long term, soft, and has self-lubrication ability
Implementation Method 2
comprising dispersed graphite particles, dispersant, and wettability modifier
Implementation Method 3
wettability modifier, which enhances mobility regulation and injection pressure by improving the compatibility and stability
Data Source
AI summary
The invention provides a modified graphite particle system for strengthening a polymer/binary/ternary composite oil displacement system. The modified graphite particle system comprises the following components: 1-5 parts by mass fraction dispersed graphite particles, 0.2-0.6 parts by mass fraction dispersant, 0.1-0.5 parts by mass fraction wettability modifier, and deionized water that accounts for the remaining content, based on 100 parts by total mass fraction of the components. In addition, the present invention also provides a preparation and a use of the modified graphite particle system for strengthening the polymer/binary/ternary composite oil displacement system. The modified graphite particle system for strengthening the polymer/binary/ternary composite oil displacement system can be used to improve mobility regulation ability and oil displacement efficiency in an injection stage, enhance injection pressure in a follow-up water displacement stage, and increase the oil displacement effect of the composite oil displacement system to the greatest extent.