Switchable Multi-Antenna Fluid Sensing for Cement Integrity
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Solution Overview
Problem
The existing methods for monitoring and tracking fluid characteristics during well cementing operations are hindered by the need for multiple antennas and RF coaxial cables, which increase the diameter of the sensor tube, potentially interfering with cement flow and compromising its integrity.
Innovation Solution
A switchable multi-antenna fluid sensing system that uses RF multiplexers to reduce the number of RF conductors routed through the sensor tube, allowing for efficient monitoring of fluid characteristics and flow without interfering with cement flow by selectively enabling antenna sub-arrays and routing signals through a reduced number of RF coaxial cables.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple antennas and RF coaxial cables are used to monitor fluid characteristics, then measurement precision is improved, but device complexity increases and the sensor tube diameter increases interfering with cement flow
Solution Approach 1:
Multiple antenna elements are merged into a single sensor tube assembly, with all antennas and their corresponding RF coaxial cables routed through a common protective housing. This consolidation reduces the overall number of separate components and allows for more efficient space utilization within the constrained downhole environment.
Solution Approach 2:
The patent transitions from a linear arrangement of antennas to a two-dimensional array configuration mounted on the exterior surface of the casing. This spatial reorganization allows multiple antennas to be positioned simultaneously without requiring sequential cable routing, reducing complexity while maintaining monitoring precision across different locations.
2Measurement precision
If multiple antennas with RF coaxial cables are used, then measurement precision is improved, but the sensor tube diameter increases interfering with cement flow
Solution Approach 1:
Multiple RF coaxial cables are combined and routed through a single protective housing or sensor tube assembly. This consolidation allows all necessary antenna connections to be maintained while significantly reducing the overall diameter of the sensor tube, preventing interference with cement flow in the annular region.
Solution Approach 2:
The patent employs a nested configuration where multiple antennas and their corresponding cables are arranged in a compact, space-efficient manner within the sensor tube assembly. This nested arrangement minimizes the external dimensions of the sensor tube while accommodating all necessary components for multi-point fluid monitoring.
3Device complexity
If the sensor tube diameter increases, then device complexity is reduced, but cement flow interference increases causing voids and reduced cement thickness
Solution Approach 1:
All RF coaxial cables and antenna connections are merged into a single integrated sensor tube assembly with optimized internal routing. This consolidation achieves the dual benefit of reducing device complexity through systematic organization while simultaneously minimizing the external diameter to eliminate harmful interference with cement flow, preventing void formation and ensuring adequate cement thickness.
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 solution enables effective monitoring of fluid characteristics and flow rates while maintaining the integrity of the cement flow, reducing the risk of voids and compromised cement thickness, thus ensuring the long-term strength and integrity of the cement.
Implementation Method 1
RF multiplexers to reduce the number of RF conductors routed through the sensor tube
Implementation Method 2
A number of electromagnetic techniques may be used to monitor such fluid characteristics as composition, density and thickness
Data Source
AI summary
Switchable multi-antenna fluid sensing systems and methods, including a tubular-mounted switchable multi-antenna fluid sensing system that includes two antenna arrays that each senses fluid characteristics not sensed by other antenna arrays, each array including multiple antenna sub-arrays and each sub-array including a receive and transmit antenna with a radial transmission direction different from that of other sub-arrays. The system also includes two RF multiplexers, each coupled to the antennas within the arrays and to corresponding RF transceivers within a sensor tube. A CPU within the sensor tube couples to the RF transceivers, controls signal transmission by, and processes received signals from, the antennas. RF cables coupling the RF transceivers and RF multiplexers are grouped and routed through one end of the sensor tube. The CPU further causes the RF multiplexers to periodically couple to the antennas and stores and/or transmits data representing the received signals.