Multi-Frequency Downhole Bus Communication Filters
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Solution Overview
Problem
Legacy sensors on a single wire bus in wellbore drilling systems experience communication congestion and precision loss due to the MIL-STD-1553 protocol, which is not compatible with newer high-frequency sensors, leading to interference and incompatible data transmission standards.
Innovation Solution
Implementing high-frequency communication sensors that operate at frequencies an order of magnitude greater than legacy sensors, using high-quality factor passive filters to prevent interference, and employing high frequency pass and blocking filters to isolate signals on the single wire bus, allowing for multi-frequency communication without disrupting legacy sensor operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If legacy sensors communicate using MIL-STD-1553 protocol on the single wire bus, then communication compatibility with existing sensors is maintained, but communication precision is lost due to congestion
Solution Approach 1:
The patent segments the communication spectrum by implementing multiple communication frequencies on the single wire bus. Legacy sensors operate at lower frequencies while new sensors operate at higher frequencies, dividing the communication channel into distinct frequency bands that prevent congestion and interference, thereby maintaining both compatibility and precision
Solution Approach 2:
The patent changes the frequency parameter of communication signals to resolve the contradiction. By operating different sensor types at different frequencies (legacy sensors at lower frequencies, new sensors at higher frequencies), the system maintains compatibility with existing protocols while eliminating congestion-induced precision loss through spectral separation
2Measurement precision
If new high-frequency communication sensors are implemented on the single wire bus, then communication precision is improved, but interference with legacy sensor operation occurs
Solution Approach 1:
The patent segments the frequency spectrum into distinct bands, with legacy sensors operating at lower frequencies and new high-frequency sensors operating at higher frequencies. This spectral segmentation prevents high-frequency signals from interfering with legacy sensor operations while maintaining communication precision for both sensor types
Solution Approach 2:
The patent introduces frequency-selective filtering as an intermediary mechanism that allows high-frequency and low-frequency signals to coexist on the same wire without interference. The filters act as mediators that pass desired frequency bands while blocking unwanted frequencies, enabling precise communication without harmful interference
3Adaptability or versatility
If multiple communication protocols are supported on the single wire bus, then adaptability is improved, but device complexity increases
Solution Approach 1:
The patent uses frequency as a distinguishing parameter to support multiple communication protocols simultaneously. By assigning different frequency ranges to different protocol types (MIL-STD-1553 at lower frequencies, new protocols at higher frequencies), the system achieves multi-protocol adaptability without requiring complex protocol switching logic or multiple physical buses
Solution Approach 2:
The patent makes the single wire bus universal by enabling it to carry multiple communication protocols concurrently through frequency division. The same physical bus infrastructure supports both legacy MIL-STD-1553 communication and new high-frequency protocols, eliminating the need for separate dedicated buses for each protocol type
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
Enables accurate position tracking and formation characterization by allowing simultaneous high-frequency and low-frequency communication on the same bus without interference, enhancing drilling precision and compatibility with various sensor standards.
Implementation Method 1
a first high frequency pass filter coupled between the at least one communication sensor and the single wire bus, wherein the first high frequency pass filter is configured to pass the communication signal from the at least one communication sensor to the single wire bus; and a first high frequency blocking filter coupled between the at least one legacy sensor and the single wire bus, wherein the high frequency blocking filter is configured to block the communication signal from the at least one communication sensor from disturbing the legacy signal of the at least one legacy sensor
Data Source
AI summary
A bottom hole assembly includes a single wire bus, a legacy sensor coupled to the single wire bus, and at least one high frequency communication sensor coupled to the single wire bus. The high frequency communication sensor injects a high frequency signal alternating between high frequency synchronization pulses and high frequency data signals onto the single wire bus. A first high frequency pass filter coupled between the at least one high frequency communication sensor and the single wire bus is also included. The high frequency pass filter passes the high frequency signal to the single wire bus from the high frequency communication sensor. The bottom hole assembly includes a first high frequency blocking filter coupled between the legacy sensor and the single wire bus. The high frequency blocking filter blocks the high frequency signal from the high frequency communication sensor from disturbing a legacy signal at the legacy sensor.