Optical Couplers in Downhole Splitter Assembly
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Solution Overview
Problem
Existing downhole sensing systems face challenges in accurately measuring downhole parameters due to limitations in signal-to-noise ratio and effective integration time, and are prone to communication disruptions if one optical sensor fails, as they rely on a single optical fiber for multiple sensors.
Innovation Solution
The use of optical couplers in a downhole splitter assembly to split interrogating light signals into multiple optical sensing branches, allowing each branch to have its own single-ended optical sensor, ensuring that if one sensor fails, it does not affect the others, and improving measurement accuracy by enhancing signal-to-noise ratio and integration time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single optical fiber is used to connect multiple optical sensors in series, then the device complexity is reduced, but the reliability deteriorates because communication is disrupted if one sensor fails
Solution Approach 1:
The optical sensing system is segmented into multiple independent branches, each with its own optical fiber connection to the light source and receiver. This segmentation ensures that a failure in one branch does not affect other branches, thereby improving reliability while maintaining manageable system complexity through modular architecture.
2Device complexity
If multiple optical sensors share a single optical fiber, then the device complexity is reduced, but the measurement precision deteriorates due to limited signal-to-noise ratio and integration time
Solution Approach 1:
The optical path is segmented into dedicated branches for each sensor, allowing each sensor to receive full optical power from the light source without sharing. This increases the signal-to-noise ratio and effective integration time for each measurement, thereby improving measurement precision while using a modular fiber configuration that doesn't excessively increase complexity.
3Reliability
If a single-ended optical sensor design is used with optical couplers, then the reliability improves by isolating sensor failures, but the device complexity increases due to additional optical couplers and splitter assembly
Solution Approach 1:
The optical system is segmented into independent sensor branches using optical couplers and splitter assembly, creating physical isolation between sensors. This segmentation ensures that failure of one sensor does not propagate to others, improving reliability. The modular nature of the couplers allows for standardized, repeatable connections that manage complexity through consistency.
Solution Approach 2:
Optical couplers serve as intermediary components that connect the single optical fiber from the light source to multiple sensor branches. These couplers act as mediators that distribute optical power evenly to each branch while providing isolation, thereby improving reliability without requiring complex direct connections between components.
4Use of energy by moving object
If optical power is distributed to multiple sensors through a single fiber, then the use of energy is efficient, but the measurement precision deteriorates due to reduced optical power per sensor
Solution Approach 1:
The optical power distribution is segmented into dedicated branches using optical couplers, allowing each sensor to receive sufficient optical power for accurate measurements. While this requires additional coupling components, the modular architecture maintains overall system efficiency by eliminating the need for high-power sources and enabling optimized power distribution to each sensor branch independently.
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 ensures continuous data collection from remaining sensors even if one fails, enhances measurement accuracy, and reduces costs by using a more reliable and cost-effective multi-gauge design with single-ended optical sensors.
Implementation Method 1
a first optical coupler to split the interrogating light signals between the first and second optical sensing branches and to guide light signals reflected from the first and second optical sensing branches back to the first optical waveguide
Implementation Method 2
a first optical waveguide for guiding the interrogating light signals downhole to interrogate optical sensors in each of the first and second optical sensing branches
Implementation Method 3
each of the branches having at least one single-ended optical sensor to measure one or more downhole parameters that does not pass the interrogating optical signals through
Data Source
AI summary
Techniques and apparatus are provided for downhole sensing using optical couplers in a downhole splitter assembly to split interrogating light signals into multiple optical sensing branches. Each optical branch may then be coupled to an optical sensor (e.g., a pass-through or an optical single-ended transducer (OSET)) or to another optical coupler for additional branching. The sensors may be pressure/temperature (P/T) type transducers. Some systems may exclusively use OSETs as the optical sensors. In this manner, if one of the OSETs is damaged, it does not affect light traveling to any of the other sensors, and sensing information from remaining sensors is still returned.