Downhole Antenna Position Sensing via Signal Intensity
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Solution Overview
Problem
Existing systems for behind-casing measurements face challenges in maintaining alignment between tubing-side and casing-side antennas due to unintentional movement caused by temperature changes and pressure variations, leading to signal loss or degradation, which is typically addressed through trial and error adjustments.
Innovation Solution
A system that electronically determines the relative position of tubing-side antennas by measuring signal intensities and using processing devices connected to casing-side antennas to calculate and transmit precise alignment information, incorporating circuitry with rectifiers, low-pass filters, and analog-to-digital converters to ensure accurate positioning and prevent signal degradation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If trial and error adjustment is used to maintain antenna alignment, then alignment can be achieved, but time is lost and operational efficiency decreases
Solution Approach 1:
The patent replaces the mechanical trial-and-error adjustment process with an electronic sensing system that uses electromagnetic signals to automatically determine antenna positions. The system measures signal intensities between tubing-side and casing-side antennas and processes this data to calculate precise alignment information, eliminating the need for manual mechanical adjustments.
Solution Approach 2:
The system enables self-alignment by automatically sensing and calculating antenna positions without requiring operator intervention. The electronics on the tubing string independently determine their own position relative to the casing-side antennas and can make self-correcting adjustments, freeing the operator from repetitive alignment tasks.
2Reliability
If manual monitoring and adjustment is performed, then signal degradation can be addressed, but productivity decreases due to operator involvement
Solution Approach 1:
The system implements continuous feedback by constantly monitoring signal intensities between antennas and automatically processing this information to maintain optimal alignment. The electronics sense changes in signal strength caused by relative movement and continuously adjust or report position information to maintain reliable communication, enabling uninterrupted high-speed operations.
Solution Approach 2:
The patent accelerates the alignment and monitoring process by using rapid electronic signal processing instead of slow manual procedures. The system can evaluate position information and make adjustments much faster than manual trial-and-error methods, significantly increasing operational productivity while maintaining signal quality.
3Length of moving object
If electronics are moved during RIH operations, then well penetration is achieved, but unintentional movement causes misalignment and signal loss
Solution Approach 1:
The system is designed to be dynamic and adaptive, continuously sensing and tracking the relative positions of antennas as the tubing string moves during RIH operations. Rather than relying on fixed static alignment, the electronic sensing system adapts to changing positions in real-time, maintaining reliable communication throughout the dynamic well penetration process.
Solution Approach 2:
The system performs preliminary positioning measurements during the RIH operation to anticipate and compensate for potential misalignment before it occurs. By continuously monitoring signal intensities and calculating position information in advance, the system can prevent signal loss rather than merely responding to it after misalignment has occurred.
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 precise alignment and maintains optimal communication by determining the position of tubing-side antennas relative to casing-side antennas, reducing signal loss and allowing for real-time adjustments during operations, thereby improving the reliability of behind-casing measurements.
Implementation Method 1
electrons outside the casing are part of the casing assembly during run-in-hole ("RIH") and cementing and its position is fixed in the well when cemented. The electronics on the tubing string are moved as RIH operations progress
Implementation Method 2
A rectifier is coupled to each antenna to produce a voltage proportional to a signal intensity
Implementation Method 3
A low-pass filter is coupled to the rectifier
Implementation Method 4
An analog-to-digital converter is coupled to the low-pass filter
Data Source
AI summary
Certain aspects of the present disclosure relate to precise position determination for the downhole placement and position of the tubing-side portion of a behind-casing measurement system. The position determination can be used to establish precise alignment of the system and thus prevent signal loss. A system according to some aspects includes a casing-side antenna mountable between a well casing and a formation wall and a processing device connected to the casing-side antenna. The processing device is operable to measure signal intensities for a signal received from at least one tubing-side antenna, calculate a position of the tubing-side antenna relative to the casing-side antenna based on the signal intensities, and transmit the position to the surface.