Sensor Extension Housing for Gradient Measurement Accuracy
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Solution Overview
Problem
Current downhole drilling systems lack flexibility in sensor spacing for accurate gradient measurements, which is crucial for precise location of target wells during operations like blowouts, where the distance between sensors limits the accuracy of electromagnetic field gradient measurements.
Innovation Solution
A drilling assembly with a drill string and a second portion of greater diameter, featuring a sensor extension housing with blades that maximize the radial distance between sensors, allowing for more accurate electromagnetic field gradient measurements by positioning sensors within recessed areas of the blades, and a processor to determine gradient measurements based on sensor outputs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If sensors are positioned within the standard drill string diameter, then the device complexity is reduced and ease of manufacture is improved, but the measurement precision of electromagnetic field gradient is degraded due to limited sensor spacing
Solution Approach 1:
The drilling assembly is segmented into a standard drill string portion and a separate sensor extension housing portion. The sensor extension housing contains the sensors and is positioned at the end of the drill string, allowing the sensors to be spaced farther apart without increasing the complexity of the entire drilling system. This segmentation isolates the complexity to a specific component while achieving the desired measurement precision.
Solution Approach 2:
The sensor extension housing extends the drill string diameter in the radial dimension to position sensors farther apart. By utilizing the radial dimension (creating a second portion with greater diameter than the first drill string diameter), the system achieves better gradient measurement accuracy through increased sensor spacing without significantly increasing overall device complexity.
2Measurement precision
If the distance between sensors is increased to improve gradient measurement accuracy, then the measurement precision is improved, but the device complexity increases due to the need for larger diameter housing and blade structures
Solution Approach 1:
The sensor extension housing incorporates blades that can be positioned and configured to provide the necessary sensor spacing. The housing structure allows for adjustable and configurable sensor positioning within the extended diameter configuration, providing operational flexibility in sensor placement while maintaining the increased spacing required for accurate gradient measurements.
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 configuration increases the accuracy and sensitivity of gradient measurements by maximizing the distance between sensors, enhancing the ability to detect electromagnetic field differences and improve the precision of target well location identification during drilling operations.
Implementation Method 1
One such measurement is a gradient measurement that identifies changes in an electromagnetic field within the formation
Data Source
Figure 1A
Figure 1B
Figure 2
AI summary
The system comprises a drilling apparatus comprising a first portion (111) and a second portion (116). In certain embodiments, the first portion may comprise a bottom hole assembly (BHA) or a drill string, and the second portion may comprise a sensor extension housing. The first portion (111) has a first diameter and the second portion (116) has a second diameter that is greater than the first diameter. The system includes a sensor pair 114) disposed within the second portion and proximate to an outer radial surface of the second portion. A processor is in communication with the sensor pair. The processor determines at least one gradient measurement based, at least in part, on outputs of the sensor pair.