Downhole Ranging Using Electromagnetic Signal Compensation
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Solution Overview
Problem
Current wellbore ranging techniques face challenges in accurately determining the position of injection wellbores relative to production wellbores due to adverse effects from manufacturing variability, electronic differences, and temperature changes, which can lead to inaccurate measurements and potential blowouts or inefficient steam injection in SAGD processes.
Innovation Solution
A system employing electromagnetic transmitters and receivers with compensation techniques, such as partial and full compensation, to minimize confounding effects on electromagnetic signals, allowing for precise positioning of injection wellbores relative to production wellbores by processing signals to determine accurate distances and locations during drilling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If electromagnetic transmitters and receivers are deployed in wellbores for ranging, then positioning capability is provided, but manufacturing variability and electronic differences cause measurement inaccuracies
Solution Approach 1:
The patent implements a feedback mechanism where the system measures electromagnetic signals between transmitters and receivers, compares these measurements against expected values, and applies compensation techniques to correct for manufacturing variability and electronic differences. This closed-loop approach continuously refines positioning accuracy by feeding back measurement errors and adjusting subsequent readings.
Solution Approach 2:
The system dynamically adjusts measurement parameters and compensation factors based on environmental conditions and signal characteristics. By changing parameters such as frequency, amplitude, and timing offsets in response to measured conditions, the system optimizes positioning accuracy while compensating for hardware variations and environmental interference.
2Measurement precision
If compensation techniques are implemented to improve measurement accuracy, then positioning precision is enhanced, but system complexity increases
Solution Approach 1:
The patent applies preliminary compensation techniques during the signal processing stage, where standard correction algorithms are pre-programmed into the system. These compensation methods are automatically applied to raw measurements before final positioning calculations, reducing the need for complex real-time processing while maintaining high precision.
Solution Approach 2:
The system uses computationally simple compensation algorithms that can be rapidly executed without requiring complex hardware. By implementing software-based correction methods rather than complex hardware solutions, the system achieves high precision with minimal additional device complexity.
3Reliability
If in-situ calibration methods are used to improve positioning accuracy, then measurement reliability is enhanced, but deployment time and operational complexity increase
Solution Approach 1:
The patent performs calibration and compensation setup during the manufacturing and deployment phase rather than requiring in-situ calibration during operation. Transmitters and receivers are pre-characterized and their unique electrical characteristics are stored in memory, allowing immediate use upon deployment without time-consuming on-site calibration procedures.
Solution Approach 2:
The system automatically applies compensation based on pre-stored calibration data without requiring manual intervention or specialized calibration equipment. The transmitters and receivers self-correct their measurements using internally stored characterization data, eliminating the need for external calibration services or procedures.
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 compensation techniques enhance measurement accuracy and robustness, reducing reliance on complex calibration methods, providing simpler and more reliable positioning for enhanced hydrocarbon recovery, and allowing for easier sensor deployment without in-situ calibration.
Implementation Method 1
a first transmitter disposed in a first wellbore to transmit electromagnetic signals; a first receiver disposed in a second wellbore to receive the electromagnetic signals transmitted by the first transmitter
Data Source
AI summary
Downhole ranging from multiple wellbores. In one example, multiple transmitters and multiple receivers are disposed in multiple wellbores to exchange electromagnetic signals. By implementing a full compensation technique, a computer system determines multiple compensated signals. A compensated signal is determined from a signal received from a first wellbore and a second signal received from a second wellbore. In another example, a first transmitter is disposed in a first wellbore, a first receiver is disposed in a second wellbore, and either a second transmitter or a second receiver is disposed in either the first wellbore or the second wellbore. By implementing partial compensation techniques, a computer system determines compensated signals. Using the compensated signals, the computer system determines a position of a first wellbore relative to a second wellbore, and provides the position.