High-Pressure Cell for Thermodynamic Measurements on Petroleum Fluids
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Solution Overview
Problem
Current PVT study devices for petroleum reservoir fluids face limitations such as small fluid volumes, low-performance visualization, and inefficient detection of the gas/liquid interface, particularly for condensate gases.
Innovation Solution
A high-pressure cell with a motorized piston, a temperature-controlled drying oven, and a tilting mechanism, equipped with a digital camera and interface recognition software for precise visualization of the liquid/gas interface, allowing for accurate measurements of thermodynamic characteristics of both liquid hydrocarbons and condensate gases.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a small cell size is used, then the device complexity is reduced, but the volume of fluid tested is limited
Solution Approach 1:
The cell is divided into two distinct chambers: a small reaction chamber for PVT measurements and a large collection chamber for condense gas accumulation. This segmentation allows the measurement chamber to remain small while the overall device can handle larger fluid volumes through the collection chamber.
Solution Approach 2:
The invention transitions from a single-chamber design to a multi-chamber three-dimensional configuration, adding spatial dimensionality to separate measurement and collection functions, thereby resolving the contradiction between small cell size and large fluid volume capacity.
2Device complexity
If traditional visualization means are used, then the device complexity is low, but the measurement precision is insufficient for condensate gases
Solution Approach 1:
The patent replaces traditional mechanical/optical visualization methods with a digital camera system and image processing software. This substitution enables precise detection of the liquid/gas interface position through digital image analysis, significantly improving measurement precision for condensate gases.
Solution Approach 2:
The invention creates a digital copy (image) of the physical interface position using a camera, then processes this digital information to determine interface location with high precision. This copying approach allows for more accurate measurement than direct optical observation methods.
3Adaptability or versatility
If the cell is tilted to study condensate gases, then the adaptability is improved, but the device complexity increases
Solution Approach 1:
The invention introduces a tilting mechanism that allows the cell to be dynamically adjusted between horizontal and angled positions. This dynamic capability enables the same device to adapt to different measurement requirements (oil vs. condensate gas studies) without requiring multiple separate devices.
Solution Approach 2:
The tilting mechanism enables the cell to serve multiple functions: horizontal position for oil measurements and angled position for condensate gas measurements. This multi-functionality allows a single device to handle different fluid types and measurement modes, improving adaptability.
4Device complexity
If the liquid/gas interface position is detected manually, then the device complexity is low, but the productivity is reduced
Solution Approach 1:
The patent implements an automated feedback system where the digital camera continuously captures images of the interface position, and image processing software automatically determines and records the interface location. This automated feedback loop eliminates manual measurement, significantly improving productivity and measurement efficiency.
Solution Approach 2:
The system performs self-service by automatically detecting and recording interface position data without requiring manual intervention. The digital camera and processing software work autonomously to extract measurement data, thereby increasing productivity while keeping device complexity manageable.
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
Enables optimized and reproducible PVT measurements with larger sample volumes and improved visualization, facilitating accurate calculations of condensation or evaporation volumes and flow rates, even at high pressures and temperatures.
Implementation Method 1
a drying oven surrounding said cell and intended to vary the temperature of said cell
Implementation Method 2
a high-pressure cell equipped with a motorized piston
Implementation Method 3
means for tilting said frame so as to tip the cell up
Implementation Method 4
The means for visualizing the position of the liquid/gas interface can comprise a digital camera connected to a liquid/gas interface recognition software
Data Source
AI summary
Device for measuring thermodynamic characteristics of a fluid sample, comprising in combination: a high-pressure cell (6) equipped with a motorized piston, a drying oven surrounding the cell and intended to vary the cell temperature, motorization means arranged outside the drying oven, means for stirring the fluid placed within the cell, a frame supporting said oven and means (1) for tilting said frame so as to tip the cell up. The cell comprises:—a specific head for measurements on condensate gas wherein a chamber (42) of elongate shape along the axis of the cell is intended to collect the liquids, and—means (44) for visualizing the position of the liquid/gas interface.