Downhole NMR Antenna Rotation for Multi-Directional Stratum Detection
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Solution Overview
Problem
Existing nuclear magnetic resonance logging instruments can only collect stratum information in one direction, limiting multi-directional detection and failing to reflect the overall properties of undisturbed strata.
Innovation Solution
A downhole three-dimensional scanning nuclear magnetic resonance imaging logging instrument with a radio frequency antenna, orienting device, and rotating device, where the antenna is fixed on the outer surface of the orienting device, which is disposed on a magnet, and the rotating device drives the orienting device to rotate, allowing the antenna to acquire echo signals in different directions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the radio frequency antenna is fixed on the magnet surface or disposed opposite to the magnet with relative stationarity, then the structure is simple and stable, but the antenna can only collect stratum information in one direction and cannot perform multi-directional detection
Solution Approach 1:
The patent applies the dynamics principle by transforming the fixed antenna configuration into a rotating one. The antenna is mounted on a rotating platform that can change its orientation relative to the magnet, enabling the antenna to scan and collect information from multiple directions dynamically. This resolves the contradiction by adding rotational capability to achieve multi-directional detection while maintaining a relatively simple overall structure.
Solution Approach 2:
The patent applies the dimensionality change principle by adding the rotational degree of freedom to the antenna system. Instead of the antenna being fixed in a single position or orientation, the rotating mechanism enables the antenna to operate in multiple spatial dimensions, allowing it to scan and detect stratum information from different angles and directions, thereby achieving multi-directional detection capability.
2Measurement precision
If the radio frequency antenna collects echo signals in one direction only, then the device structure is simple, but the echo signals cannot reflect the overall properties of the undisturbed stratum
Solution Approach 1:
The rotating antenna system dynamically adjusts its orientation to scan through different directions, collecting echo signals from multiple spatial locations. This dynamic scanning capability allows the system to gather comprehensive information about the undisturbed stratum properties from various angles, improving measurement accuracy while maintaining reasonable system complexity through the use of a rotating platform rather than multiple fixed antennas.
Solution Approach 2:
The rotating antenna system serves multiple detection functions by being able to orient itself toward different directions. A single antenna structure performs the function of multiple directional detectors by rotating to different positions, enabling the system to measure overall stratum properties comprehensively without requiring a complex array of fixed antennas for each direction.
3Adaptability or versatility
If multiple radio frequency antennas are arranged to achieve multi-directional detection, then multi-directional detection capability is improved, but the device complexity and number of components increase
Solution Approach 1:
Instead of using multiple fixed antennas to achieve multi-directional detection, the patent employs a single antenna that achieves multi-functionality through rotation. The rotating platform enables one antenna to perform the detection function of multiple antennas by sequentially orienting itself toward different directions, thereby reducing the total number of antenna components while maintaining comprehensive multi-directional detection capability.
Solution Approach 2:
The patent replaces the static multi-antenna configuration with a dynamic single-antenna system. Rather than having multiple antennas fixed in different positions, the system uses one antenna mounted on a rotating platform that can dynamically change its orientation. This dynamic approach achieves the same multi-directional detection capability with fewer components, reducing device 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
Enables multi-directional measurement and reflects the overall properties of the undisturbed stratum by rotating the antenna to specific positions, thereby saving energy and providing targeted measurements in specified directions.
Implementation Method 1
A radio frequency antenna can be set on a detection instrument to obtain echo signals of the stratum
Implementation Method 2
Nuclear magnetic resonance measurement technology is a technology using the nuclear magnetic resonance principle to detect oil and gas
Data Source
AI summary
The application provides a downhole three-dimensional scanning nuclear magnetic resonance imaging logging instrument and a probe, an antenna thereof, wherein the antenna comprises: an radio frequency antenna, an orienting device and a rotating device; the radio frequency antenna is fixed on an outer surface of the orienting device, and the orienting device is arranged on a magnet, the rotating device is fixed on the magnet; the rotating device is movably connected to the orienting device; and the rotating device is configured to drive the orienting device to rotate relative to the magnet, such that the radio frequency antenna on the orienting device can be drived to rotate, and echo signals in different directions can be acquired by the radio frequency antenna. The purpose of multi-directional measurement can be achieved, and the overall properties of an undisturbed stratum can be reflected by the applicant.