Coriolis Gyroscope Bias Compensation for MWD Drilling
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Solution Overview
Problem
Current gyroscopes used in directional drilling lack environmental adaptability and bias repeatability in high-temperature and vibration environments, making them unsuitable for long-term operation in harsh drilling conditions.
Innovation Solution
A gyro measurement while drilling system incorporating a strapdown inertial unit with a Coriolis vibration gyroscope, a filtering and level conversion module, and a navigation computer for data processing, which includes full parameter compensation and initial alignment algorithms to mitigate bias errors and ensure accurate azimuth, inclination, and tool face angle measurements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional gyroscopes are used in directional drilling, then azimuth measurement capability is provided, but environmental adaptability and bias repeatability deteriorate in high-temperature and vibration environments
Solution Approach 1:
The patent applies parameter changes by implementing full parameter compensation algorithms that dynamically adjust gyroscope output based on temperature, vibration, and other environmental parameters. The system collects raw gyroscope data and applies compensation calculations to correct bias errors caused by high-temperature and vibration environments, thereby maintaining measurement reliability under harsh drilling conditions
Solution Approach 2:
The patent replaces traditional mechanical gyroscopes with Coriolis vibration gyroscopes that use vibrational mechanics instead of mechanical rotation. This substitution eliminates mechanical wear and improves resistance to high-temperature and vibration environments while maintaining azimuth measurement capability through Coriolis force detection
2Measurement precision
If gyro measurement system is implemented, then measurement accuracy is improved, but device complexity increases
Solution Approach 1:
The patent segments the measurement system into distinct functional modules: Coriolis vibration gyroscope for azimuth measurement, accelerometers for inclination measurement, and separate compensation algorithms for different error sources. This modular segmentation allows each component to be optimized independently while maintaining overall measurement precision and facilitating easier implementation
Solution Approach 2:
The patent implements a universal measurement platform that simultaneously provides azimuth, inclination, and tool face angle measurements using integrated sensors and unified compensation algorithms. The system serves multiple measurement functions through a single coordinated system rather than requiring separate dedicated systems for each parameter
3Measurement precision
If full parameter compensation algorithm is applied, then bias error is reduced, but data processing time increases
Solution Approach 1:
The patent applies preliminary action by pre-calculating and storing compensation parameters and algorithms during system setup and calibration phases. The full parameter compensation algorithm uses pre-determined correction factors for temperature and vibration effects, allowing real-time data processing to rely on stored compensation models rather than performing complex calculations from scratch, thereby reducing processing time while maintaining bias error reduction
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 environmental adaptability and bias repeatability of gyroscopes, providing high precision and reliability in extreme drilling conditions, compatible with both measurement while drilling and wireline applications.
Implementation Method 1
a gyroscope and an accelerometer fixedly connected in a probe tube; the gyroscope is a Coriolis vibration gyroscope
Data Source
AI summary
A gyro measurement while drilling system, which includes a strapdown inertial unit, a filtering and level conversion module, a data acquisition and data communication module, a driving mechanism, a driving control module and a navigation computer. A gyro measurement while drilling method, which is used in the measurement while drilling system and includes one or a combination of the following methods: a full parameter variable compensation method, an initial alignment algorithm and a continuous measurement while drilling method. The system and method of the present disclosure can meet the most demanding application scenarios in the field of petroleum drilling measurement, i.e., measurement while drilling (MWD), and are compatible with other scenarios, such as wireline measurement, gyro steerable measurement and other application fields; the system and method also solve the problems of environmental adaptability, bias repeatability and bias error of a gyroscope in a high-temperature and vibration environment, and solve the technical problems of an inertial instrument in a deep steerable drilling application scenario from the perspective of systems.