Compensating Bending Misalignment in Deep Azimuthal Resistivity Measurements
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Solution Overview
Problem
In downhole operations, sensor devices in boreholes often misalign due to manufacturing inaccuracies and tool deformation, affecting the precision of measurements in hydrocarbon exploration.
Innovation Solution
The method involves using oriented transmitters and receivers with alignment sensors to estimate parameters of interest in the earth formation by compensating for alignment differences, employing algorithms to modify receiver signals and account for deformation-induced misalignment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If deep reading azimuthal tools with large transmitter-receiver spacings are used, then measurement depth and exploration capability are improved, but bending effects cause significant misalignment between transmitters and receivers
Solution Approach 1:
The patent applies preliminary action by measuring the alignment between transmitters and receivers using alignment sensors before conducting the actual resistivity measurements. This allows the system to pre-determine misalignment angles and compensate for bending effects in advance, ensuring accurate measurements even with large transmitter-receiver spacings.
Solution Approach 2:
The patent implements feedback by using alignment sensors to continuously monitor the relative positions and orientations of transmitters and receivers. The measured alignment information is fed back into the measurement system to correct for misalignment effects, maintaining measurement precision despite tool bending during logging operations.
2Adaptability or versatility
If tool bending is allowed to occur during logging operations, then adaptability to earth formation navigation is improved, but sensor device alignment shifts from desired orientation
Solution Approach 1:
The system performs preliminary alignment measurements using alignment sensors to determine the actual positions and orientations of transmitters and receivers before conducting resistivity measurements. This preliminary characterization of the bent tool configuration enables accurate data interpretation despite deviations from the manufactured alignment.
Solution Approach 2:
The patent changes the measurement parameters by incorporating alignment information (angles and positions) into the resistivity measurement process. By adjusting the interpretation parameters based on measured alignment deviations, the system maintains accuracy even when the physical tool alignment differs from the desired orientation.
3Measurement precision
If alignment compensation algorithms are applied, then measurement accuracy is improved, but processing complexity increases
Solution Approach 1:
The alignment compensation process is simplified by performing preliminary measurements of transmitter-receiver alignment using dedicated alignment sensors. These preliminary measurements provide the necessary correction parameters before the main resistivity measurements are taken, reducing the complexity of real-time processing.
Solution Approach 2:
The patent introduces alignment sensors as intermediary devices that measure the physical alignment between transmitters and receivers. These sensors act as mediators by providing alignment information that bridges the gap between the physical bent tool configuration and the idealized measurement model, simplifying the compensation process.
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 approach enables accurate estimation of earth formation parameters despite misalignment, improving the precision of logging operations and data interpretation in hydrocarbon exploration.
Implementation Method 1
estimating at least one parameter of interest of the earth formation using signals generated by at least one oriented receiver on a bottom hole assembly in response to energy generated by at least one oriented transmitter
Data Source
AI summary
An apparatus and method for estimating a parameter of interest of an earth formation involving alignment information between non-collocated oriented receivers and their corresponding non-collocated oriented transmitters. The method may include generating signal responses indicative to energy transmitted into an earth formation; estimating differences in alignment between transmitters and receivers; using the estimated differences in alignment to compensate for misalignment; and estimating a parameter of interest using the misalignment compensated signals. The misalignment estimate may include an inversion of at least one measurement from an alignment sensor. The apparatus may include a bottom hole assembly with oriented transmitters, oriented receivers, one or more alignment sensors, and at least one processor configured to compensate for misalignment using information about difference in alignment between at least one oriented transmitter and at least one oriented receiver.