Adaptive Filter Pump Interference Mud Pulse Telemetry
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Solution Overview
Problem
Current methods for filtering pump interference in mud pulse telemetry in oil and gas exploration are hindered by the low Signal-to-Noise Ratio (SNR) due to the proximity of acoustic transducers to pumps, leading to ineffective detection of signals, and require complex mathematical models and multiple sensors, which are time-consuming and costly.
Innovation Solution
The use of adaptive filters, specifically affine projection filters, that utilize stroke monitor signals to regenerate pump interference harmonics and track real-time changes in pump operation frequency, allowing for effective filtering of pump interference from a single sensor without the need for special data sequences or stopping the pump, thereby reducing idle time and instrumentation complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple sensors and complex mathematical models are used to filter pump interference, then filtering effectiveness is improved, but device complexity and time consumption increase
Solution Approach 1:
The patent extracts only the necessary components for pump interference filtering - specifically using a single pressure sensor combined with stroke monitor signals from the pump. This eliminates the need for multiple acoustic transducers and complex instrumentation while maintaining filtering effectiveness through adaptive filtering techniques that leverage the readily available stroke monitor signals.
Solution Approach 2:
The patent makes the stroke monitor signal serve multiple functions: it monitors pump operation status and simultaneously provides the reference signal for adaptive filtering. This multi-functionality eliminates the need for separate reference signal generation systems and reduces overall device complexity while maintaining reliable pump interference filtering.
2Reliability
If multiple sensors and complex mathematical models are used to filter pump interference, then filtering effectiveness is improved, but time consumption increases
Solution Approach 1:
The patent performs preliminary action by continuously monitoring stroke monitor signals and maintaining ready-to-use reference signals for pump interference. This allows the adaptive filter to immediately process and remove pump interference from telemetry data without requiring time-consuming data collection periods or complex model calculations, thus reducing time loss while maintaining filtering effectiveness.
3Object-affected harmful factors
If acoustic transducers are placed far from pumps, then pump interference attenuation is improved, but signal detection capability deteriorates
Solution Approach 1:
The patent introduces stroke monitor signals as an intermediary element that mediates between the pump interference and the filtering process. These signals serve as a reference that captures pump interference characteristics, allowing the adaptive filter to effectively remove pump interference from the pressure sensor data regardless of the physical distance between the acoustic transducer and pump, thus maintaining both attenuation and detection capability.
4Measurement precision
If pump operation is stopped to collect reference data, then reference signal accuracy is improved, but productivity decreases
Solution Approach 1:
The patent maintains continuous useful action by collecting stroke monitor signals and generating reference signals for pump interference filtering during normal pump operation. This eliminates the need to stop the pump for data collection, allowing continuous drilling operations to proceed while maintaining accurate reference signals for effective pump interference filtering, thus preserving both measurement precision and productivity.
Data Source
AI summary
Systems and methods for filtering pump interference in mud pulse telemetry are provided. A method includes receiving a monitor output, selecting an adaptive factor in an adaptive filter module, and adjusting the adaptive factor when the adaptive filter module has reached convergence. The method may further include receiving a sensor input, providing a filtered signal output, and modifying a drill configuration based on the signal output. A system configured to perform the method above is provided. A method as above further including modifying a drill configuration based on the signal output is provided.