Modular Rotary Steerable Actuators for Drilling Complexity
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Solution Overview
Problem
Conventional rotary steerable drilling systems for directional drilling are complex, expensive, and require complicated servicing, leading to high downtime and environmental exposure issues due to the need for frequent adjustments and maintenance of internal hydraulics.
Innovation Solution
The development of modular rotary steerable actuators that package all necessary components, including a pump, fluid reservoir, pressure compensator piston, solenoid control valve, and actuator piston, in a self-contained cartridge mounted externally, allowing for easy replacement and reduced environmental exposure, with hydraulic circuits isolated to simplify system pressures and enable quick tool readiness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional rotary steerable drilling systems are used, then directional drilling capability is achieved, but system complexity and cost increase significantly
Solution Approach 1:
The steering tool is divided into multiple independent modular actuators that can be individually replaced. Each actuator contains its own hydraulic circuit, pump, and control components, allowing one actuator to be serviced without affecting the others. This segmentation reduces overall system complexity by isolating failure points and simplifying maintenance procedures.
Solution Approach 2:
The actuators are designed to be externally mounted on the steering tool body rather than integrated internally. This extraction allows actuators to be easily removed and replaced from outside the tool, eliminating the need to open and service the entire steering tool assembly. The external mounting simplifies servicing while maintaining full directional drilling capability.
2Reliability
If conventional rotary steerable systems require frequent maintenance, then steering accuracy can be maintained, but downtime increases
Solution Approach 1:
Each actuator is an independent modular unit with its own sealed hydraulic circuit. When one actuator requires maintenance or replacement, only that single actuator needs to be serviced while the other actuators remain operational. This segmentation minimizes downtime by allowing parallel operation of remaining actuators during maintenance of one unit.
Solution Approach 2:
Replacement actuators can be prepared and tested on the surface before being needed downhole. The modular design allows actuators to be pre-assembled, pre-filled with hydraulic fluid, and tested externally, so that when an actuator failure occurs, a ready-to-install replacement can be quickly deployed without extensive field servicing.
3Reliability
If internal hydraulics are serviced frequently, then system reliability is maintained, but environmental exposure issues increase
Solution Approach 1:
The actuators are mounted externally on the steering tool body, allowing them to be serviced, replaced, or tested without opening the main tool housing. This external extraction eliminates the need to expose internal hydraulics to the environment during maintenance, preventing contamination while maintaining system reliability through easy access to actuator components.
Solution Approach 2:
The actuator serves as an intermediary component that can be removed and serviced separately from the main steering tool. By isolating the hydraulic components within removable actuator units rather than integrated internal systems, the design allows maintenance to be performed on the actuator as a self-contained unit, preventing environmental exposure of the main tool's internal hydraulics.
4Ease of repair
If modular actuators with external mounting are used, then ease of replacement is improved, but device complexity increases
Solution Approach 1:
The steering system is segmented into standardized modular actuators with uniform mounting interfaces. This segmentation, while adding modular complexity, actually simplifies replacement procedures through standardization. Each actuator is a self-contained module that can be quickly swapped using standardized connections, making the replacement process simpler despite the modular architecture.
Solution Approach 2:
The modular actuators are designed with universal mounting interfaces and standardized connection points that allow the same actuator design to be used on different steering tool configurations. This universality, while requiring a modular design approach, simplifies replacement and maintenance by allowing the same replacement part to service multiple positions and tool types, reducing the need for custom components.
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 solution simplifies servicing, reduces downtime, and minimizes environmental exposure by allowing easy replacement of actuator cartridges, while providing the benefits of hydraulic actuators without the complications of prior art systems, enabling more efficient and cost-effective directional drilling.
Implementation Method 1
solenoid control valve
Implementation Method 2
hydraulically actuated actuator piston
Data Source
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AI summary
Modular actuators, steering tools, and rotary steerable drilling systems are presented herein. A modular actuator is disclosed for use in directing a drill string, which includes a housing proximate a drive shaft. The modular actuator includes a cartridge that is configured to couple to the outer periphery of the housing. A fluid reservoir is contained within the cartridge. A hydraulically actuated actuator piston, which is slidably disposed at least partially inside the cartridge, is movable between activated and deactivated positions. A hydraulic control system is also contained within the cartridge, fluidly coupling the fluid reservoir to the actuator piston. The hydraulic control system is configured to regulate movement of the actuator piston between the activated and deactivated positions such that the actuator piston selectively presses against and moves the drive shaft and thereby changes the direction of the drill string.