Downhole Sensor Misalignment Correction
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Solution Overview
Problem
Existing drilling technologies face challenges in accurately determining the trajectory of a wellbore due to measurement errors from sensors, particularly external disturbances and misalignments, and in determining the relative position of a wellbore to existing wellbores, which can lead to costly and time-consuming operations.
Innovation Solution
A drill string system equipped with multiple sensors, including acceleration and magnetic sensors spaced apart, that generate signals to calculate misalignment and magnetic field interference, allowing for improved measurement accuracy and precise positioning within a wellbore.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple sensors are used to improve measurement accuracy, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The system divides the measurement function into multiple independent sensors (first acceleration sensor, second acceleration sensor, magnetic sensors) positioned at different locations within the drill string. Each sensor independently measures specific parameters, and their combined data provides comprehensive trajectory information while allowing individual sensor calibration and error correction
Solution Approach 2:
The system introduces a controller as an intermediary that receives signals from multiple sensors, processes the data, calculates misalignment errors, and generates corrected trajectory measurements. This intermediary coordinates the complex interactions between multiple sensors and manages the error correction algorithms
2Measurement precision
If sensors are spaced apart to detect misalignment, then measurement precision is improved, but the length of the downhole portion increases
Solution Approach 1:
The system transitions from measuring only positional coordinates to incorporating angular orientation measurements by mounting sensors at different angular positions around the drill string circumference. This dimensional addition allows detection of misalignment errors without requiring excessive axial spacing between sensors
3Measurement precision
If equipment is inserted into existing wellbores to detect magnetic fields, then positioning capability is improved, but device complexity and operational time increase
Solution Approach 1:
The drill string system performs multiple functions: it drills the wellbore while simultaneously measuring trajectory, detecting magnetic fields from existing wellbores, and determining relative positioning. The same drill string structure houses both drilling equipment and survey instrumentation, eliminating the need for separate positioning equipment insertion
Solution Approach 2:
The drill string's own magnetic components (drill collars, tool face) serve as the magnetic field sources that the magnetic sensors detect. The system uses its inherent magnetic characteristics rather than requiring external magnetic markers or equipment in existing wellbores, enabling autonomous relative positioning
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
The system enhances measurement accuracy by correcting for sensor misalignment and external interference, enabling more precise wellbore trajectory determination and relative positioning, thus reducing operational costs and time.
Implementation Method 1
a first acceleration sensor mounted within the first portion, the first acceleration sensor adapted to generate a first signal indicative of an acceleration of the first acceleration sensor
Implementation Method 2
The equipment gives rise to magnetic field disturbances, which can be detected by sensors in the new well and used to determine the position of the drilling tool and wellbore in relation to the existing wellbore
Data Source
AI summary
Certain embodiments described herein provide a measure of the misalignment of multiple acceleration sensors mounted in the downhole portion of a drill string. In certain embodiments, the measure of the misalignment corresponds to a measure of sag which can be used to provide an improved estimate of the inclination of the downhole portion of the drill string and/or the wellbore. Certain embodiments described herein provide an estimate of the magnetic interference incident upon a drilling system using multiple magnetic sensors mounted within a non-magnetic region of the downhole portion of the drilling system. Certain embodiments utilize the magnetic measurements to determine an axial interference resulting from one or more magnetic portions of the downhole portion and to provide an improved estimate of the azimuthal orientation of the downhole portion with respect to the magnetic field of the Earth.