Downhole Drilling Tools with Replaceable Radial Steering Plates
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing drill bit steering mechanisms experience significant wear and reduced usable life due to the wear on movable parts and bent-pipe systems, which affect the consistency and directionality of borehole formation.
Innovation Solution
A downhole drilling tool with radially extendable elements, such as pistons, secured to an elongate body, which can be controlled to extend under pressure from drilling fluid and include replaceable plates and valves for steering and sensing, allowing for wireless communication and modular attachment to a docking station for diagnostics and maintenance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If bent-pipe systems or movable parts are used for steering, then steering capability is achieved, but wear on components increases significantly
Solution Approach 1:
The steering system is segmented into a replaceable plate component and a permanent elongate body. The plate, which contains the radially extendable element and experiences wear, can be separated and replaced independently from the expensive elongate body containing electronics and other valuable components. This resolves the contradiction by allowing the wear-prone steering elements to be replaced without replacing the entire tool assembly.
Solution Approach 2:
The plate is designed as a consumable, wear-prone component that can be easily replaced. By concentrating the wear experience on this relatively simple, replaceable plate rather than on the entire tool assembly, the system maintains reliability while preserving steering capability. The plate acts as a sacrificial element that protects more valuable components.
2Ease of operation
If movable parts are extended and retracted for steering, then directional control is achieved, but usable life of the system decreases
Solution Approach 1:
The system separates the movable steering components (radially extendable element on the plate) from the permanent structural components (elongate body). This segmentation allows the plate to be replaced after a certain period of use, extending the overall system life while maintaining directional control capability through repeated plate replacements.
Solution Approach 2:
The plate is designed to be discarded after experiencing wear from repeated extension and retraction operations. By discarding only the worn plate rather than the entire tool, the system recovers and reuses the expensive elongate body, thereby extending usable life while preserving ease of operation through continuous replacement of functional plates.
3Measurement precision
If radially extendable elements push against borehole walls for steering, then steering precision is improved, but wear on the elements increases
Solution Approach 1:
The radially extendable element is integrated into the replaceable plate, making it a sacrificial component that can be replaced when worn. This allows the element to perform its precision steering function without concern for long-term durability, as replacement is straightforward. The precision function is preserved while the wear issue is managed through replacement rather than prevention.
Solution Approach 2:
The system allows the radially extendable element to perform its steering function until wear becomes significant, at which point the entire plate is replaced. This self-service approach lets the component operate at full precision capability without requiring preventive maintenance or protective measures, as the replacement process is simple and integrated into the modular design.
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 solution reduces wear on expensive components by containing them within the elongate body, extends the tool's usable life, and enables precise borehole steering with interchangeable plates and sensors, enhancing drilling performance and flexibility.
Implementation Method 1
A dynamic element, forming part of the plate, may be radially extendable therefrom. In various embodiments, this dynamic element may extend under pressure from drilling fluid traveling through the elongate body and temporarily held within a cavity formed between the plate and the body.
Data Source
AI summary
A downhole drilling tool, forming part of a subterranean drilling system, may include at least one plate secured to an exterior of an elongate body. Electronics may be disposed between the plate and the body to be protected by the plate while still readily accessible. A dynamic element may be radially extendable from the plate to engage an inner wall of a borehole being drilled. If this radially-extendable element becomes worn or damaged from this engagement, the plate may be replaced. More expensive components of the drilling tool may be contained within the elongate body, rather than the plate, thus reducing replacement frequency. Additionally, plates including unique features may be employed at different times without altering the underlying elongate body.