Directional Well Trajectory Control via Eccentric Ring Feedback
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Solution Overview
Problem
Existing directional well trajectory control methods fail to achieve precise control due to the inability to perform closed-loop control and remove interference signals, leading to inaccuracies in well trajectory management, especially in complex wells like extended-reach and ultra-thin oil layer horizontal wells.
Innovation Solution
The directional well trajectory control method employs dynamic incremental coding for parameter transmission, closed-loop control of the eccentric ring rotation angle, and sensor placement to accurately calculate and adjust the well trajectory, using drilling fluid pulses and an electromagnetic clutch to enable precise three-dimensional control without frequent trips.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If traditional drilling tools are used, then the exploitation of complex wells becomes possible, but the control accuracy of well trajectory deteriorates
Solution Approach 1:
The patent implements closed-loop control by using sensors to detect the actual well trajectory parameters (inclination angle, azimuth angle) and feeding this information back to the control system. The controller compares the actual parameters with target parameters and automatically adjusts the eccentric ring rotation angle to compensate for deviations, thereby achieving high-precision well trajectory control in complex wells.
Solution Approach 2:
The patent replaces traditional mechanical trajectory control methods with an automated control system that uses sensors for detection, microprocessors for computation, and electromagnetic actuators for execution. This substitution enables real-time closed-loop control and significantly improves trajectory accuracy compared to conventional mechanical systems.
2Ease of operation
If existing control methods are used, then directional drilling can be performed, but closed-loop control capability is lost
Solution Approach 1:
The patent establishes a complete closed-loop control system where sensors continuously monitor well trajectory parameters, the controller processes this feedback information, and the eccentric mechanism adjusts accordingly. This automated feedback loop enables real-time trajectory correction without requiring frequent manual interventions or tripping operations.
Solution Approach 2:
The control system performs self-correction by automatically detecting trajectory deviations through sensors and adjusting the drill bit direction via the eccentric mechanism without external intervention. The system serves itself by continuously monitoring and correcting its own performance, eliminating the need for frequent trips to adjust trajectory.
3Device complexity
If simple control methods are used, then the system remains simple, but interference signals cannot be removed
Solution Approach 1:
The patent uses feedback from sensors to continuously monitor well trajectory parameters and distinguish valid signals from interference. The control system processes this feedback information to identify and filter out interference signals, ensuring accurate trajectory detection and control even in complex drilling environments.
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 method achieves high accuracy and flexibility in well trajectory control, reducing tripping times and improving borehole quality, making it suitable for complex wells, while overcoming the limitations of existing control methods by enabling closed-loop control and interference signal removal.
Implementation Method 1
an electromagnetic clutch, a sensor and a controller connected to the eccentric mechanism
Implementation Method 2
down-transmit control signals to the controller through drilling fluid pulses
Data Source
AI summary
Disclosed is a directional well trajectory control method based on drill pipe drive, the method including the following steps: parameters down-transmission, determining the offset vector, closed loop control of eccentric ring rotation angle, and well parameter closed-loop control; this method can achieve three-dimensional well trajectory control without frequent trips during drilling operations, and has a high penetration rate, good wellbore cleaning effect, well trajectory control accuracy, high flexibility, low tripping times, high borehole quality, high safety, etc., which is suitable for the development of special process wells such as medium-deep wells, ultra-deep wells, ultra-thin oil layer horizontal wells and unconventional oil and gas wells in China's complex oil and gas reservoirs. This method can also achieve precise control of well trajectory, and overcome the shortcomings of existing control methods that cannot achieve closed-loop control and cannot remove interference signals.