Thickening CO2 Displacement Visual Analog Device
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Solution Overview
Problem
Carbon dioxide displacement in oil reservoirs faces challenges due to its low viscosity and mobility ratio, leading to fingering and gas channeling issues, which hinder efficient oil recovery, especially in low permeability reservoirs.
Innovation Solution
A thickening carbon dioxide displacement visual analog device comprising a pressure boost module, visual stirring vessel module, and displacement analog module, which includes a main pump, visual stirring vessel, temperature control, and a thermostat, is used to increase CO2 viscosity and improve mobility ratios, enabling more efficient displacement and reducing gas channeling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If pure liquid CO2 is used as displacing fluid, then the viscosity of CO2 is extremely low (0.1 mPa·s), but the mobility ratio is too large causing fingering and gas channeling
Solution Approach 1:
The patent changes the physical parameters of CO2 by adjusting temperature and pressure conditions, and by introducing thickening agents, to increase its viscosity from 0.1 mPa·s to a higher value that improves mobility ratio while maintaining displacing capability
Solution Approach 2:
The patent introduces a thickening agent as an intermediary substance that interacts with CO2 to increase its viscosity. This mediator allows CO2 to maintain its low density and high diffusivity while achieving the necessary viscosity increase to reduce mobility ratio and prevent gas channeling
2Quantity of substance
If supercritical CO2 is used for displacement, then the density is close to liquid and diffusion coefficient is 100 times of liquid, but gas channeling occurs in advance
Solution Approach 1:
The patent modifies the operating parameters (temperature, pressure) and chemical composition of CO2 by adding thickening agents to increase viscosity while maintaining the beneficial high density and diffusivity characteristics of supercritical CO2, thereby preventing premature gas channeling
Solution Approach 2:
The patent creates a composite fluid system combining CO2 with thickening agents, achieving a mixture that retains the high density and diffusivity of supercritical CO2 while gaining the viscosity enhancement needed to prevent gas channeling and improve displacement stability
3Reliability
If CO2 viscosity is increased to improve displacement efficiency, then the mobility ratio improves, but the device complexity increases
Solution Approach 1:
The patent divides the system into functional modules: a pressure boost module for pressurizing CO2, a visual stirring vessel module for mixing CO2 with thickening agents, and a displacement analog module for conducting experiments. This segmentation allows each module to perform its specific function independently, simplifying the overall system design and operation
Solution Approach 2:
The visual stirring vessel module serves multiple functions: it acts as a mixing vessel for CO2 and thickening agents, a reaction chamber for forming the thickened CO2 mixture, and a visual observation window for monitoring the mixing process. This multi-functionality reduces the need for separate dedicated equipment for each operation
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 device enhances the displacement efficiency and inhibits gas channeling, thereby improving the recovery efficiency of low permeability reservoirs by optimizing gas injection methods and providing data for mathematical modeling.
Implementation Method 1
pressurize the low-pressure gas at the steel cylinder into high-pressure gas by using the gas booster pump
Implementation Method 2
The visual stirring vessel module includes main pump component, visual stirring vessel component, temperature control device, pressure measurement device, first stirrer device, second stirrer device
Implementation Method 3
the supercritical point of carbon dioxide is far lower than the condition of reservoir, where, its critical temperature is 31.26° C. and critical pressure is 7.38 MPa
Implementation Method 4
Can the viscosity of CO2 be greatly increased, the supercritical point of CO2 be greatly increased, and the mobility ratio be significantly improved like polymer displacement to improve the displacement efficiency and inhibit the gas channeling
Implementation Method 5
formation oil can be effectively displaced to the producing well
Data Source
AI summary
The invention discloses a kind of thickening carbon dioxide displacement visual analog device, including pressure boost module, visual stirring vessel module and displacement analog module; the mentioned pressure boost module, visual stirring vessel module and displacement analog module are connected successively; the invention is used to develop the experimental study including evaluation of gas injection miscible-phase/non-miscible-phase displacement efficiency, percolation characteristics during gas displacement, mobility control technology during gas drive, and optimization of gas injection way.