Crude Oil Vapor Pressure Stabilization by Methane Gas Stripping
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Solution Overview
Problem
Existing crude oil stabilization methods, such as direct-fired heater treaters and electric heating, face issues with emissions, safety risks, and high costs, making them impractical for large-scale oil and gas facilities.
Innovation Solution
A method utilizing gas stripping with methane to remove light hydrocarbons from crude oil, combined with optional electrical heating, which enhances light ends removal and reduces emissions and safety concerns.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If direct-fired heater treaters are used to heat crude oil, then light ends removal is effective, but emissions of carbon dioxide and uncombusted hydrocarbons increase
Solution Approach 1:
The harmful combustion process is extracted and removed from the system. Instead of burning fuel gas to heat the crude, the patent uses a heater treater that heats the crude without combustion, separating the heating function from the harmful emission-generating combustion process.
Solution Approach 2:
The patent converts the harmful combustion process into a beneficial non-combustion heating process. By using a heater treater that does not rely on fuel gas combustion, the system eliminates CO2 and uncombusted hydrocarbon emissions while maintaining effective light ends removal capability.
2Temperature
If direct-fired heater treaters are used, then heating capability is provided, but safety risks from fire hazards increase
Solution Approach 1:
The fire hazard is extracted and removed by eliminating the combustion process. The heater treater provides necessary heating capability without burning fuel gas, thus removing the fire risk associated with direct-fired systems while maintaining temperature control for effective stabilization.
Solution Approach 2:
The system creates a safer, inert-like environment by avoiding combustion entirely. Without open flames or hot combustion gases, the process environment becomes inherently safer and less prone to fire hazards, while still achieving the required heating temperatures through alternative heating mechanisms.
3Reliability
If electric heaters are used to heat crude oil, then safety risks are reduced, but equipment cost and power infrastructure requirements increase
Solution Approach 1:
The patent introduces a heater treater as an intermediary device that provides safe heating without requiring expensive electric infrastructure. This intermediate solution avoids both the safety issues of direct-fired systems and the high cost of electric heating, using a mechanically simple heating approach that is economically viable for remote field applications.
Solution Approach 2:
The system uses a simple, cost-effective heater treater design that avoids expensive electric heating equipment and infrastructure. By using a mechanically simple heating system rather than complex electric infrastructure, the patent provides an economically attractive solution that is suitable for remote field applications with limited infrastructure.
4Use of energy by moving object
If fuel gas is combusted for heating, then heating energy is provided, but product consumption increases
Solution Approach 1:
The fuel gas consumption is extracted and eliminated by removing the combustion process entirely. The heater treater provides necessary heating energy without burning fuel gas, thus preventing consumption of valuable hydrocarbon products that would otherwise be used as fuel.
Solution Approach 2:
The patent converts the harmful fuel gas consumption into a beneficial non-consuming heating process. By using mechanical or thermal heating methods that do not require fuel gas combustion, the system preserves valuable hydrocarbon products while still achieving the required heating temperatures for effective light ends removal.
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 method effectively stabilizes crude oil vapor pressure, minimizing emissions and safety risks while reducing the need for fuel gas combustion, thus lowering operational costs and enhancing process efficiency.
Implementation Method 1
A stripping gas stream comprising methane is introduced into the separator
Implementation Method 2
Methods of vapor pressure stabilization of crude oil utilizing gas stripping
Implementation Method 3
At least a portion of the first, second, third, and fourth light hydrocarbon streams are treated in a vapor treatment process
Data Source
AI summary
Methods of crude oil stabilization may include separating crude oil in a bulk separator into a first light hydrocarbon stream, a first water stream, and a first bottoms stream; separating the first bottoms stream in an intermediate pressure separator into a second light hydrocarbon stream, a second water stream, and a second bottoms stream; separating the second bottoms stream in a separator into a third light hydrocarbon stream, a third water stream, and a third bottoms stream; introducing a stripping gas stream comprising methane into the separator; storing the third bottoms stream in a vessel comprising an outlet for a fourth light hydrocarbon stream; treating at least a portion of the first, second, third, and fourth light hydrocarbon streams in a vapor treatment process to form a final light hydrocarbon stream; and recycling at least a portion of the final light hydrocarbon stream to the separator.


