Multiphase Pipeline Corrosion Sampling With T-Pipe Monitoring
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Solution Overview
Problem
Existing corrosion monitoring systems for multiphase fluids pipelines are inadequate in accurately assessing and mitigating corrosion due to the complex nature of multiphase hydrocarbons, which include oil, gas, and water, and factors like hydrogen sulfide, carbon dioxide, and microbial presence, leading to unpredictable corrosion rates and damage.
Innovation Solution
A corrosion monitoring system (CMS) utilizing a T-shaped pipe subassembly with integrated corrosion coupons and probes, coupled with a controller, to analyze hydrocarbon samples for real-time and long-term corrosion assessment, supported by fluid analyzers like GC-MS, SEM-EDS, and XRD, providing comprehensive corrosion profiles and inhibitor management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single corrosion monitor is used to analyze hydrocarbon samples, then the device complexity is reduced, but the measurement precision and reliability of corrosion assessment deteriorates due to inability to provide both real-time and long-term corrosion data simultaneously
Solution Approach 1:
The corrosion monitoring system is segmented into two distinct corrosion monitors: a first corrosion monitor for real-time corrosion assessment and a second corrosion monitor for long-term corrosion assessment. This segmentation allows each monitor to be optimized for its specific function, with the first monitor providing immediate feedback on corrosion rates and the second monitor tracking cumulative corrosion over time, thereby improving overall measurement precision without significantly increasing system complexity
Solution Approach 2:
Both corrosion monitors are integrated into a single T-shaped pipe subassembly that handles multiphase hydrocarbon samples, making the system multi-functional. The first and second corrosion monitors can both receive and analyze the same hydrocarbon sample flow, providing both real-time and long-term corrosion data from a unified system architecture, which improves reliability while maintaining manageable complexity
2Productivity
If corrosion monitors analyze hydrocarbon samples continuously, then the productivity and real-time monitoring capability are improved, but the loss of substance increases due to continuous sampling and analysis requirements
Solution Approach 1:
The T-shaped pipe subassembly acts as an intermediary device that directs hydrocarbon samples to both corrosion monitors simultaneously. The sample collection container serves as another intermediary that can store excess samples or facilitate their safe disposal. These intermediary components enable continuous monitoring productivity while providing mechanisms to manage and minimize hydrocarbon sample loss through controlled sampling and storage
3Reliability
If multiple corrosion monitors are integrated in a T-shaped pipe subassembly, then the reliability of corrosion assessment is improved through comprehensive data collection, but the device complexity and difficulty of operation increase
Solution Approach 1:
The first and second corrosion monitors are merged into a single T-shaped pipe subassembly that handles sample collection and distribution. This merging approach consolidates multiple monitoring functions into one integrated unit, improving reliability through comprehensive data collection while simplifying operation by providing a unified interface for sample intake and analysis rather than requiring separate operational procedures for each monitor
Data Source
AI summary
To monitor corrosion in multiphase fluids pipelines, a first pipe is fluidically coupled to extend perpendicularly away from a bottom portion of a multiphase hydrocarbons pipeline. The multiphase hydrocarbons include oil, gas and water. The first pipe is fluidically coupled to a T-shaped pipe subassembly including a second pipe and a third pipe attached to the second pipe to form a T-shape. A hydrocarbon sample of the multiphase hydrocarbons is drawn into the first pipe. Gas in the hydrocarbon sample separates gravimetrically from oil and water in the hydrocarbon sample. The hydrocarbon sample is flowed from the first pipe through the T-shaped pipe subassembly. The hydrocarbon sample is analyzed using a corrosion coupon attached to one end of the third pipe and a corrosion probe attached to another end of the third pipe. A level of corrosion of the pipeline is determined based on results of analyzing the hydrocarbon sample.