Alternating Polarity Casing Antennas for Wellbore Power Transfer
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Solution Overview
Problem
Communicating power and data between casing-side sensors and tubing-side electronics in a wellbore is challenging due to the separation by intermediate casings, which leads to precision issues and inefficiencies in power transfer and signal maintenance.
Innovation Solution
Alternating the polarity of casing-side antennas to induce current in opposite directions, allowing adjacent antennas to share a full-wave rectifier for efficient power transfer and improved communication range, reducing losses and component costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If casing-side sensors are positioned on the outer surface of the casing string behind the casing, then measurement precision is improved, but power transfer efficiency and communication reliability deteriorate due to separation by intermediate casings
Solution Approach 1:
The antenna system is segmented into multiple individual antennas rather than using a single large antenna. Each antenna can be independently positioned and oriented, allowing them to work together to overcome the shielding effect of intermediate casings and maintain efficient power and communication transfer while preserving measurement precision from the casing-side sensors.
Solution Approach 2:
Multiple tubing-side antennas act as intermediaries to transfer power and communication signals through the intermediate casings to the casing-side sensors. These intermediary antennas create electromagnetic fields that can penetrate or couple through the casing walls, maintaining efficient energy transfer despite the physical separation and shielding.
2Reliability
If multiple casing-side antennas are used to maintain communication through intermediate casings, then communication reliability is improved, but device complexity increases
Solution Approach 1:
Multiple individual antennas are merged into a unified antenna system that functions as a single coherent unit. The antennas are collectively coupled to the casing-side sensor, allowing them to work together to improve communication reliability through intermediate casings while presenting a simplified interface to the sensor, thereby managing device complexity.
Solution Approach 2:
The multiple antennas serve multiple functions simultaneously: they provide redundant communication paths through intermediate casings, enable flexible positioning and orientation, and can be collectively coupled to a single sensor. This multi-functionality improves reliability without proportionally increasing complexity at the sensor interface.
3Loss of energy
If adjacent casing-side antennas are wound in opposite directions to create alternating polarity, then power transfer efficiency is improved, but manufacturing complexity increases
Solution Approach 1:
Adjacent antennas are wound in opposite directions to create alternating polarity, which improves power transfer efficiency by optimizing electromagnetic field coupling. While this increases manufacturing complexity, the inverted winding pattern provides a clear, systematic manufacturing approach that can be standardized.
Solution Approach 2:
The winding direction parameter is changed alternately between adjacent antennas to create the desired polarity pattern. This parameter change optimizes the electromagnetic characteristics for power transfer while providing a simple, repeatable manufacturing rule that limits the increase in manufacturing complexity.
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
Enhances communication efficiency by maintaining power transfer and data transmission over longer distances and varying positions, reducing component size and costs, and improving alignment flexibility with the tubing string.
Implementation Method 1
Each antenna can include a conductive wire coiled to generate current in response to an electromagnetic field generated by a tubing-side antenna
Implementation Method 2
The shared full-wave rectifier can convert alternating current ("AC") into direct current ("DC"), which can be provided to the casing-side sensor
Data Source
AI summary
An antenna system can include casing-side antennas and a full wave rectifier. The casing-side antennas can be coupled to a casing string that is positioned in a wellbore for communicatively coupling to a tubing-side antenna positioned in the wellbore. Each of the casing-side antennas can include a conductive wire positioned to carry current that can be induced on the conductive wire in response to an electromagnetic field from the tubing-side antenna. A direction, relative to a common antenna junction point, of the current on the conductive wire can be opposite to the direction, relative to the common antenna junction point, in which an adjacent casing-side antenna is positioned to carry current induced in response to the electromagnetic field. The full-wave rectifier can be conductively coupled to the casing-side antennas for converting alternating current that can be generated on the casing-side antennas into direct current.