Adaptive Pulse Waveform Width Adjustment for Mud Channel Distortion
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Solution Overview
Problem
Mud pulse telemetry systems face channel estimation errors due to distortion in pulse waveforms caused by drilling conditions and the electric motor driven pulser's delay and transient effects, leading to noise and errors in signal transmission during oil well drilling operations.
Innovation Solution
Adaptive adjustment of pulse waveform width and duration using digitally controlled pulsing parameters, where a downhole pulser generates a first pulse waveform, and based on channel estimation, a stretch factor signal is sent to adjust the pulse width to minimize channel estimation errors and improve signal quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If an electric motor driven mechanism is used to generate pulse waveforms in the downhole pulser, then cost and maintenance are reduced, but delay and transient effects are introduced to the pulse waveform
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting the pulse width of the generated waveforms. The controller modifies the pulse width parameter to compensate for the transient effects and delay introduced by the electric motor driven mechanism, thereby maintaining signal accuracy despite the mechanical limitations
Solution Approach 2:
The patent implements feedback by using the detected pulse signals to estimate channel characteristics and then adjusting subsequent pulse widths based on this information. This closed-loop approach allows the system to compensate for the electric motor's transient effects by continuously adapting the pulse parameters based on actual channel conditions
2Device complexity
If the surface telemetry system assumes ideal rectangular-shape pulses, then channel estimation is simplified, but distortion and noise in the spectrum are introduced due to actual trapezoidal shape with undershoot and overshoot
Solution Approach 1:
The patent applies dynamics by transitioning from a static assumption of ideal rectangular pulses to a dynamic approach where the pulse width is continuously adjusted. The system adapts the pulse characteristics in real-time to match actual channel conditions, improving measurement precision while maintaining manageable complexity through algorithmic control
Solution Approach 2:
The patent uses parameter changes to modify the pulse width dynamically based on detected channel conditions. By adjusting this key parameter, the system compensates for the trapezoidal shape and transient effects, reducing spectral distortion and improving channel estimation accuracy without significantly increasing system complexity
3Reliability
If pulse width is increased to mitigate transient effects, then signal quality improves, but data transmission rate decreases
Solution Approach 1:
The patent applies dynamics by making the pulse width adjustable and adaptive rather than fixed. The controller dynamically modifies the pulse width based on real-time channel conditions, allowing the system to optimize between signal quality and transmission rate by selecting appropriate pulse widths for different operating conditions
Solution Approach 2:
The patent uses parameter changes to adjust the pulse width as a controllable variable. By changing this parameter adaptively, the system can improve signal quality when channel conditions are poor while maintaining higher transmission rates when conditions are favorable, thus resolving the contradiction between reliability and productivity
Data Source
AI summary
Downhole telemetry systems and related methods to adaptively adjust pulse waveform width through digitally controlled pulsing parameters.