Capillary Tube MMP Determination Method
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Solution Overview
Problem
Current methods for determining the minimum miscibility pressure (MMP) of fluids with crude oil are costly, time-consuming, and lack standardization, with techniques like slim-tube displacement and vanishing interfacial tension requiring extensive measurements and being operator-dependent.
Innovation Solution
A method involving a pressure chamber with capillary tubes of varying diameters, where a fluid is placed at different pressures, and the height of the oil composition is measured to extrapolate the minimum miscibility pressure, allowing for faster, simpler, and more accurate determination without needing precise tube diameter measurements or fluid density calculations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If slim-tube displacement technique is used to determine MMP, then miscibility can be determined, but the process is time-consuming (4-5 weeks) and costly
Solution Approach 1:
The patent extracts the essential measurement principle from the complex slim-tube displacement process by isolating the capillary rise phenomenon. Instead of performing full displacement tests, the invention uses simple capillary tube height measurements to determine MMP, eliminating the time-consuming displacement process while retaining the core measurement capability.
Solution Approach 2:
The patent creates a simplified model system using capillary tubes that replicates the essential physics of miscibility without requiring the complex slim-tube apparatus. The capillary rise method copies the interfacial tension measurement principle in a much simpler, faster format that achieves the same MMP determination goal.
2Measurement precision
If Rao's VIT technique is used to determine MMP, then fluid MMP can be determined, but extremely accurate measurements of capillary tube inner diameter and tedious density measurements are required
Solution Approach 1:
The patent removes the problematic requirements of Rao's VIT technique by extracting only the essential capillary rise measurement. The invention eliminates the need for precise tube diameter measurements and density measurements by using a modified approach where these parameters are either not required or can be determined through simpler means.
Solution Approach 2:
The patent uses simple, inexpensive capillary tubes with standard, easily measurable dimensions rather than requiring extremely precise, expensive tubing. The method accepts modest measurement precision for tube dimensions while achieving accurate MMP results through the measurement procedure itself.
3Measurement precision
If Rao's VIT technique is used to determine MMP, then miscibility conditions can be determined, but the extrapolation process is difficult and requires accurate capillary tube inner diameter measurements
Solution Approach 1:
The patent replaces the difficult graphical extrapolation process with a more direct measurement and calculation approach. Instead of plotting interfacial tension versus pressure and extrapolating to zero tension, the invention uses capillary rise height measurements that can be directly related to MMP through simpler calculations, reducing operator skill requirements.
4Reliability
If slim-tube displacement tests are performed to determine MMP, then miscibility can be assessed, but several slow-rate tests are required making the process costly
Solution Approach 1:
The patent segments the MMP determination process into simple, independent capillary rise measurements at different pressures rather than requiring multiple complete displacement tests. This segmentation allows for faster, more numerous measurements to be performed, increasing productivity while maintaining reliability through statistical analysis of multiple data points.
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
This approach reduces costs and time, provides consistent results, and allows for multiple MMP determinations, enabling the investigation of various parameters and their effects on MMP, facilitating more efficient enhanced oil recovery processes.
Implementation Method 1
The pressure chamber includes at least one capillary tube having one end disposed in an oil composition in the pressure chamber
Data Source
AI summary
Various embodiments disclosed relate to methods and apparatuses for determining a minimum miscibility pressure of a fluid with and oil composition. In various embodiments, the method can include placing a fluid into a pressure chamber at a first pressure. The pressure chamber can include at least one capillary tube having one end disposed in an oil composition in the pressure chamber. The fluid can include at least one of a gas, a liquid, and a supercritical fluid. The method can include measuring a height of the oil composition in at least one of the capillary tubes. The method can include repeating the measuring for at least one cycle using a second pressure different than the first pressure. The method can include determining the minimum miscibility pressure of the oil composition with the fluid by extrapolating from the two or more measurements.