Digital-Valve Rotary Steering With Roll-Isolated Control
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Solution Overview
Problem
Existing rotary steerable systems lack versatility to accommodate high-quality survey results and logging while drilling measurements, necessitating improved directional control and reduced exposure to torsional vibrations for enhanced measurement accuracy.
Innovation Solution
A rotary steerable system with a roll-isolated housing and digital valves, where the control unit is decoupled from the drill collar, allowing independent rotation and actuation of extendable pads via electronic control, utilizing bistable valves for precise steering and sensitive sensor operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the control unit is rigidly coupled to the drill collar, then mechanical stability is improved, but measurement precision deteriorates due to exposure to torsional vibrations
Solution Approach 1:
The system divides the control unit into a separate module that can rotate independently from the drill collar. This segmentation allows the control unit to be mechanically stable through its own rotational support while isolating sensitive sensors from the torsional vibrations of the drill collar, thereby maintaining both mechanical stability and measurement precision.
Solution Approach 2:
The patent introduces an intermediary rotational coupling mechanism between the control unit and the drill collar. This intermediary allows the control unit to follow the general rotation of the drill string while maintaining the ability to independently stabilize and isolate sensors from high-frequency vibrations, thus preserving measurement precision without sacrificing mechanical stability.
2Measurement precision
If the control unit is decoupled to isolate sensors, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The control unit is designed as a multi-functional module that simultaneously provides mechanical support, rotational coupling, sensor isolation, and electronic control. By consolidating these functions into a single universal unit, the system achieves sensor isolation for improved measurement precision without proportionally increasing overall device complexity.
3Device complexity
If traditional hydraulic actuation is used, then device complexity is reduced, but adaptability deteriorates due to limited functionality for modern drilling operations
Solution Approach 1:
The patent replaces traditional hydraulic actuation systems with an electrically actuated system. This substitution eliminates complex hydraulic components (pumps, valves, fluid lines) while providing enhanced adaptability through electronic control that can easily be programmed for different drilling operations, sensor configurations, and actuation patterns.
Solution Approach 2:
The electrically actuated system allows for dynamic parameter changes in real-time, including variable actuation forces, adjustable response times, and reconfigurable control algorithms. This adaptability enables the same basic system structure to handle diverse drilling operations without requiring complex mechanical reconfiguration.
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
Enhances measurement quality and versatility by isolating sensitive electronics from torsional vibrations, enabling independent pad actuation and optimal sensor orientation for improved wellbore steering and measurement accuracy.
Implementation Method 1
opening one of the plurality of digital valves provides high pressure drilling fluid to the corresponding pad thereby radially extending the pad. Closing the valve disconnects the pad from the pressurized drilling fluid thereby enabling the pad to retract.
Data Source
AI summary
A rotary steerable system including a plurality of extendable pads deployed in a drill collar. Each of the pads is configured to extend radially outward from the drill collar and engage a wellbore wall and steer a direction of drilling. A plurality of digital valves is in fluid communication with corresponding ones of the plurality of extendable pads such that opening one of the plurality of digital valves provides high pressure drilling fluid to the corresponding pad thereby radially extending the pad. An electronic control unit deployed in a roll-isolated housing is configured to independently open and close each of the plurality of digital valves via a communications signal.