Magnetic Dogleg Severity Estimation Without Depth Data
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Solution Overview
Problem
Existing automated drilling methods for measuring dogleg severity in wellbores require a-priori knowledge of depth and rate of penetration, which is not readily available downhole.
Innovation Solution
A method using a roll-stabilized sensor housing with magnetic field sensors and magnets in a rotating collar to measure cross-axial magnetic fields, transforming these measurements into a frequency domain to estimate dogleg severity by identifying distortions and computing ratios of peak amplitudes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If single sensor measurements are used to measure dogleg severity, then measurement capability is improved, but the method requires a-priori knowledge of depth and rate of penetration which is not readily available downhole
Solution Approach 1:
The patent introduces magnetic field sensors and magnets as intermediary elements to enable dogleg severity measurement without requiring depth and rate of penetration data. The magnetic field interactions provide a direct measurement mechanism that eliminates the need for these missing parameters, resolving the information loss problem while maintaining measurement capability
2Measurement precision
If magnetic field sensors and magnets are deployed in a rotating collar with roll-stabilized sensor housing, then dogleg severity can be measured without depth or rate of penetration data, but device complexity increases
Solution Approach 1:
The rotating collar assembly serves multiple functions: it provides structural support for the magnetic field sensors, enables rotational movement for measurement, and stabilizes the sensor housing through roll-stabilization. This multi-functionality reduces the need for separate components, thereby managing device complexity while achieving accurate downhole measurements without requiring depth or rate of penetration data
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 accurate estimation of dogleg severity without requiring depth or rate of penetration data, improving downhole measurement precision.
Implementation Method 1
The sensor housing includes a magnetic field sensor deployed therein. The collar includes at least first and second magnets deployed thereon. The magnetic field sensor makes cross-axial magnetic field measurements while the collar rotates.
Data Source
Figure 1
Figure 2A~2B
Figure 3A~3B
AI summary
A method for estimating dogleg severity includes rotating the downhole tool in a wellbore. The downhole tool includes a roll stabilized sensor housing deployed in a rotating collar. The collar includes at least first and second magnets deployed thereon. Cross-axial magnetic field measurements are made using a magnetic field sensor deployed in the sensor housing while the collar rotates. A distortion is identified in the magnetic field measurements. The dogleg severity is estimated from the distortion.