Slugcatcher and Branch Separator for Pigging Slugs
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Solution Overview
Problem
In oil production and transmission, multi-phase flows pose challenges due to slug formation in pipelines, leading to inefficient flow and mechanical stress on equipment, and existing separation systems are often bulky and unsuitable for remote or offshore locations, particularly during pigging operations which can exceed the capacity of conventional slug catchers.
Innovation Solution
A method and apparatus that involves passing a multi-phase stream through a slugcatcher system and selectively diverting a fraction of the stream to a branch pipeline and then to a gas/liquid separator to maintain continuous gas supply and accommodate large pig-induced slugs without increasing the size of the slugcatcher system, allowing for efficient separation and processing of gaseous and liquid components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional slugcatcher system is used to separate multi-phase flows, then component separation is achieved, but the system becomes bulky and heavy, reducing suitability for offshore platforms
Solution Approach 1:
The system divides the separation function into two distinct components: a compact slugcatcher for liquid-liquid separation and a separate gas-liquid separator for gas-phase separation. This segmentation allows each component to be optimized for its specific function, reducing the overall weight and complexity compared to a single bulky conventional separator.
Solution Approach 2:
A branch pipeline serves as an intermediary conduit that selectively diverts multi-phase flow from the main pipeline to the gas-liquid separator. This intermediary mechanism enables the system to handle large pig-induced slugs without requiring the main slugcatcher to be oversized, thereby reducing weight while maintaining separation reliability.
2Productivity
If the slugcatcher system is enlarged to accommodate pig-induced slugs, then capacity during pigging operations is improved, but capital expenditure increases
Solution Approach 1:
The system segments the slug handling function by using the branch pipeline and gas-liquid separator to accommodate pig-induced slugs separately from the main slugcatcher. This allows the main slugcatcher to remain compact and cost-effective while the branch system provides additional capacity when needed during pigging operations.
Solution Approach 2:
The system dynamically adapts to different operating conditions through selective diversion of flow via the branch pipeline. During normal operation, the main slugcatcher handles routine separation. During pigging operations, the branch pipeline is activated to handle large slugs, providing dynamic capacity expansion without requiring permanent oversizing of the main separator.
3Ease of manufacture
If multi-phase flow separation is delayed until downstream locations, then remote well site installation is simplified, but slug flow characteristics worsen and pressure drop increases
Solution Approach 1:
The system performs preliminary separation action by installing the slugcatcher and gas-liquid separator close to the well site, where multi-phase flow occurs. This preliminary separation prevents slug formation from developing along the pipeline, reducing pressure drop and energy losses. The branch pipeline is positioned upstream to enable early intervention in slug management.
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 enables continuous gas supply and efficient separation of components, reducing the need for large slugcatcher systems and minimizing capital expenditure while maintaining pipeline efficiency and safety, even during pigging operations.
Implementation Method 1
passing at least a fraction of the first branch multi-phase stream to a first gas/liquid separator to provide an overhead gaseous stream and a bottom liquid stream
Implementation Method 2
passing the first multi-phase stream through a first slugcatcher system to provide a first gaseous component stream and at least one first liquid component stream
Data Source
AI summary
A method and apparatus for producing gaseous and liquid components from one or more multi-phase streams in one or more pipelines. The method includes passing a first multi-phase stream along a first pipeline, and passing the first multi-phase stream through a first slugcatcher system to provide a first gaseous component stream and at least one first liquid component stream. The method also includes selectively opening a first branch pipeline from the first pipeline upstream of the first slugcatcher system to pass at least a fraction of the first multi-phase stream through the first branch pipeline to provide a first branch multi-phase stream, and passing at least a fraction of the first branch multi-phase stream to a first gas/liquid separator to provide an overhead gaseous stream and a bottom liquid stream.