Mud Pulse Telemetry Encoding Data in Pressure Transition Time
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Solution Overview
Problem
Mud pulse telemetry systems in hydrocarbon drilling face limitations in data transfer rates and battery life due to low energy storage capacity, necessitating improvements in data transfer efficiency and power management.
Innovation Solution
The system encodes data as the time between pressure transitions of pressure pulses in the drilling fluid, using modified pulse position modulation techniques to increase data transfer rates and extend battery life by encoding additional bits in pulse duration, allowing for longer intervals between pulses and reducing the overall pulse rate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of moving object
If traditional pulse position modulation is used in mud pulse telemetry systems, then battery life is extended by using fewer pulses, but data transfer rate remains limited to five bits per second or less
Solution Approach 1:
The patent transitions from encoding data solely in the temporal position of pulses to encoding data in both the temporal position and the duration/width of pulses. This dimensional expansion allows simultaneous achievement of higher data transfer rates and extended battery life by utilizing multiple encoding dimensions within the same pulse signal structure.
Solution Approach 2:
The patent modifies the pulse signal parameters by varying both the position and the duration/width of pressure pulses to encode multiple bits of data. By changing pulse duration as an additional encoding parameter beyond position, the system achieves enhanced data transfer capability while maintaining the low pulse rate necessary for battery conservation.
2Productivity
If pulse rate is increased to improve data transfer rate, then more data can be transmitted, but battery energy is depleted faster
Solution Approach 1:
The patent changes the encoding parameters from position-only to position-and-duration encoding. This allows each pulse to carry multiple bits of information, enabling higher data transfer rates without increasing the pulse frequency, thereby avoiding additional battery energy consumption.
Solution Approach 2:
By adding pulse duration as an additional encoding dimension, the system achieves higher productivity without the harmful side effect of increased energy consumption. Each pulse operates in multiple encoding dimensions, maximizing information content per unit of energy expended.
3Productivity
If more pulses are transmitted to increase data transfer rate, then data transmission capacity improves, but the time between pulses decreases requiring higher power consumption
Solution Approach 1:
The patent utilizes pulse duration as an additional encoding parameter, allowing multiple data bits to be transmitted per pulse. This eliminates the need to increase pulse frequency, thereby maintaining longer intervals between pulses and avoiding the associated power consumption and time loss.
Solution Approach 2:
By encoding data in both position and duration dimensions, the system achieves higher transmission capacity without compressing the temporal intervals between pulses. This dimensional approach decouples data capacity from pulse frequency, preserving time intervals and reducing power consumption requirements.
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 enhances data transfer rates and extends battery life, enabling more efficient data transmission during hydrocarbon drilling operations while minimizing downtime.
Implementation Method 1
the pressure pulses propagate at the speed of sound through the drilling fluid to the surface
Data Source
Figure 1
Figure 2
Figure 3~5A
AI summary
A telemetry system, method and computer-readable recording medium are provided, the method including inducing a first pressure pulse in drilling fluid, which first pressure pulse has a leading pressure transition and a trailing pressure transition. Pressure variations are read at three or more locations, and the resulting pressure signals are used to determine a time between the leading and trailing pressure transitions.