Dual-Probe Fluid Extraction System With Scraper Mechanism
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Solution Overview
Problem
Existing formation fluid collection methods often contaminate connate fluid due to drilling fluid invasion, making it difficult to obtain clean samples for analysis.
Innovation Solution
A dual-probe fluid extraction system with independently extendable inner and outer probes, each with a filter and scraper mechanism, allows for simultaneous extension and cleaning of probes to isolate and collect uncontaminated formation fluid efficiently.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a single probe is used for fluid extraction, then the device complexity is low, but the productivity of contaminated fluid drainage is insufficient
Solution Approach 1:
The single probe is segmented into two separate probes: an inner probe for clean fluid sampling and an outer probe for contaminated fluid drainage. This segmentation allows simultaneous operation of both probes, increasing the drainage productivity while maintaining manageable device complexity through modular design
2Manufacturing precision
If filters are added to probes for fluid filtration, then the purity of collected samples is improved, but the device complexity increases due to additional cleaning mechanisms
Solution Approach 1:
The scraper mechanism is designed to automatically clean the filter screens during probe retraction without requiring external intervention. The scraper is fixed to the probe body and passively removes accumulated material as the probe moves in and out, enabling self-maintenance that improves sample purity while avoiding complex automated cleaning systems
3Ease of operation
If fixed scrapers are used for filter cleaning, then the ease of operation is improved, but the reliability of continuous sampling is reduced due to potential clogging
Solution Approach 1:
The scraper is designed to continuously contact the filter screen during each probe retraction cycle, providing ongoing cleaning action rather than periodic maintenance. This continuous scraping action prevents clogging from accumulating, ensuring reliable continuous sampling while maintaining simple fixed scraper construction that is easy to operate
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 faster and more effective drainage of contaminated fluid, allowing for the collection of clean formation fluid samples with reduced contamination, improving the accuracy of fluid analysis.
Implementation Method 1
a first fixed scraper that cleans the first filter when the first probe is retracted from an extended position and a second fixed scraper that cleans the second filter when the second probe is retracted from an extended position
Data Source
AI summary
In one aspect, an apparatus for obtaining a fluid from a formation is disclosed that in one embodiment may include a fluid extraction device having a first probe and a second probe independently extendable form a tool body, a first fluid line and an associated first filter in fluid communication with the first probe for receiving the fluid from the formation and a second fluid line and an associated second filter in fluid communication with the second probe for receiving the fluid from the formation, and a first fixed scraper that cleans the first filter when the first probe is retracted from an extended position and a second fixed scraper that cleans the second filter when the second probe is retracted from an extended position.