Single-Photon Detector for Wellbore Optical Telemetry Signal Attenuation
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Solution Overview
Problem
Optical fiber telemetry systems used in petroleum drilling and production operations face limitations in data rate, deployment depth, and reliability due to signal attenuation caused by hydrogen darkening, fiber strain, bends, scattering, and losses from optical connectors or splices.
Innovation Solution
The implementation of single-photon detectors (SPDs), particularly superconducting nanowire single-photon detectors (SNSPDs), which can detect low power optical signals with high sensitivity, combined with optical amplifiers to mitigate signal attenuation and extend the range and reliability of optical telemetry systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional optical detectors are used, then the system can operate with standard detection capabilities, but the detection sensitivity is insufficient for very low power optical signals after long-distance transmission
Solution Approach 1:
The patent transitions from conventional optical detection to single-photon detection, fundamentally changing the detection parameter from detecting multiple photons to detecting individual photons. This parameter change enables the system to detect extremely weak optical signals that have undergone significant attenuation over long distances, directly resolving the contradiction between detection sensitivity and signal loss.
2Length of stationary object
If optical fiber telemetry is used to transmit data over long distances, then deployment depth is increased, but signal attenuation due to hydrogen darkening, fiber strain, bends, and scattering limits the effective range
Solution Approach 1:
The patent replaces conventional optical detection mechanisms with quantum-based single-photon detection. This substitution enables reliable detection of optical signals after they have traveled through extremely long fiber optic cables (exceeding 100 km), where conventional detectors would fail due to attenuation from hydrogen darkening, fiber strain, bends, and scattering.
3Device complexity
If conventional optical detection is used, then the system structure remains simple, but ancillary equipment such as optical amplifiers are required to maintain signal strength, increasing system complexity
Solution Approach 1:
The patent extracts and eliminates the need for optical amplifiers and other ancillary signal-strengthening equipment by implementing single-photon detection. This extraction approach allows the system to maintain high reliability over long distances while actually reducing overall system complexity, as the detector itself becomes sufficiently sensitive to handle extremely weak signals without additional components.
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 solution enables the detection of very low energy optical signals, improving the range, data rate, and reliability of optical telemetry systems, extending the service life of fiber optic systems, and reducing the need for ancillary equipment, especially in deep-water applications.
Implementation Method 1
single-photon detectors (SPDs), particularly superconducting nanowire single-photon detectors (SNSPDs), which can detect low power optical signals with high sensitivity
Implementation Method 2
superconducting nanowire single-photon detectors (SNSPDs)
Data Source
AI summary
A telemetry system is disclosed for use in a wellbore extending from the surface. The telemetry system includes fiber optic cable locatable in the wellbore, the fiber optic cable including at least one optical fiber. The telemetry system also includes a telemetry device operable to transmit an optical telemetry signal over the fiber optic cable. An optical detector operably connected to the optical fiber and includes a single-photon detector operable to receive the optical telemetry signal transmitted over the optical fiber.