Motion Sensor Fluid Flow Modulation Telemetry Signal Detection
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Solution Overview
Problem
Existing MWD fluid flow modulation telemetry systems face challenges in detecting fluid flow modulation signals effectively due to signal degradation caused by mud pump noise, which affects the signal-to-noise ratio.
Innovation Solution
The use of a motion sensor, such as a microelectromechanical systems (MEMS) accelerometer, is positioned on the exterior of a conduit between the discharge side of a fluid pump and the inlet to a pipe string, allowing for improved detection of fluid flow modulation signals by aligning with maximum signal and minimum noise positions, and combining these with signal processing to enhance the signal-to-noise ratio.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If pressure transducers are used to detect fluid flow modulation signals, then signal detection is achieved, but signal-to-noise ratio deteriorates due to mud pump noise
Solution Approach 1:
The patent replaces pressure transducers (mechanical sensing system) with accelerometers (motion sensing system) to detect fluid flow modulation signals. This substitution allows detection of conduit motion caused by modulated fluid flow while being less susceptible to mud pump noise, thereby improving signal-to-noise ratio without sacrificing detection capability
Solution Approach 2:
The patent uses the conduit itself as an intermediary element that transmits both the fluid flow modulation signals and motion information to the accelerometers. By sensing the motion of the conduit rather than directly measuring pressure, the system indirectly detects the modulated flow signals while filtering out certain noise components
2Measurement precision
If motion sensors are positioned on the exterior of the conduit, then signal-to-noise ratio is improved, but device complexity increases
Solution Approach 1:
The conduit serves multiple functions: it transports drilling fluid, provides structural support, and acts as a mounting surface for accelerometers. By utilizing the existing conduit structure for sensor mounting, the patent avoids adding separate complex positioning structures, thereby improving signal-to-noise ratio through external sensor placement without significantly increasing device complexity
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 significantly improves the signal-to-noise ratio by filtering out mud pump noise and optimizing signal detection, leading to more reliable and accurate telemetry signal reception at the surface.
Implementation Method 1
a motion sensor, such as a microelectromechanical systems (MEMS) accelerometer
Data Source
AI summary
An apparatus for detecting fluid modulation signals transmitted by an instrument in a wellbore includes a motion sensor coupled to a selected position on an exterior of a conduit coupled between a discharge side of a fluid pump and an inlet to a pipe string suspended in the wellbore. The instrument is coupled to the pipe string. A signal detector is in signal communication with the motion sensor.