Downhole Magnetic Beacon for Utility Line Detection
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Solution Overview
Problem
Existing horizontal directional drilling systems face challenges in accurately locating underground utility lines to avoid collisions during drilling operations, as they rely on above-ground detection methods that may not effectively identify lines from below ground, increasing the risk of drill bit accidents.
Innovation Solution
A downhole device with a magnetic dipole source and a magnetic field sensor comprising two ferrite rods, positioned within the drill string, transmits and detects magnetic fields from underground utility lines, allowing for real-time detection and communication of utility line positions to an above-ground tracker, enabling the drilling system to halt operations if a line is detected nearby.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If above-ground detection methods are used to locate utility lines, then the detection process is simpler, but the accuracy and reliability of detecting underground utility lines from below ground is reduced
Solution Approach 1:
The patent inverts the traditional detection approach by placing the detection device inside the borehole at the bottom rather than on the surface above ground. This allows the drill string to carry a beacon that emits magnetic signals from below ground level, enabling direct detection of utility lines through the drill string's magnetic field sensor, thereby improving detection reliability while keeping the overall system relatively simple
Solution Approach 2:
The patent introduces a magnetic field sensor as an intermediary detection mechanism within the drill string. This sensor detects magnetic signals from utility lines through the drill string structure, serving as a mediator between the below-ground beacon and the surface control system, enabling reliable detection without complex above-ground equipment
2Measurement precision
If a magnetic field sensor with multiple ferrite rods is used, then the detection capability is improved, but the device complexity increases
Solution Approach 1:
The magnetic field sensor is segmented into multiple independent ferrite rods arranged in specific patterns. Each rod acts as an independent magnetic field detector, and their combined signals provide precise measurement of the magnetic field vector components. This segmentation allows the sensor to achieve three-dimensional detection capability while maintaining modular simplicity
Solution Approach 2:
The patent applies local quality by positioning ferrite rods in specific orientations and locations within the sensor assembly. The rods are arranged to detect different components of the magnetic field at specific locations, optimizing the detection precision for the particular application of locating utility lines through the drill string
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 enhances the ability to detect underground utility lines, reducing the risk of drill bit collisions by providing real-time data for steering the drill string around buried obstacles, thus improving operational safety and efficiency.
Implementation Method 1
A downhole device with a magnetic dipole source and a magnetic field sensor comprising two ferrite rods, positioned within the drill string, transmits and detects magnetic fields from underground utility lines
Implementation Method 2
a magnetic field sensor positioned within the housing and comprising two and only two ferrite rods
Implementation Method 3
a magnetic field sensor formed from two or more ferrite rods
Data Source
AI summary
A system for locating an underground utility line using a beacon positioned within a downhole tool. The beacon comprises a magnetic sensor formed from one or more ferrite rods. The rods are arranged such that no rod is orthogonal to the longitudinal axis of the beacon housing. The magnetic sensor detects the presence of an underground utility line and sends a signal to an above-ground tracker indicating that a line has been detected. An above-ground locator may be used to determine the position of the line relative the beacon, so that the downhole tool may be steered away from the line.