Steerable Drilling Tool Shaft Bending via Magnetic Steering
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Solution Overview
Problem
Current steerable drilling tools face limitations in directional control and efficiency due to reliance on contact with borehole surfaces, which can lead to drilling issues and reduced operational efficiency in directional drilling applications.
Innovation Solution
A steerable drilling tool with a rotating shaft and a steering subsystem that applies forces through a pair of bearings to angulate the shaft, allowing for controlled directional changes by exerting bending moments near the drill bit, enhancing steering efficiency and operational efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If steering mechanisms rely on contact with borehole walls to direct the drilling tool, then directional control is achieved, but drilling problems occur and operational efficiency is reduced
Solution Approach 1:
The patent replaces the conventional mechanical contact-based steering mechanism with a magnetic field-based steering system. Magnets are positioned on the drilling tool to generate magnetic fields that interact with ferromagnetic material in the borehole wall, enabling directional control without physical contact between the tool and borehole wall, thus eliminating the inefficiencies associated with contact-based steering
Solution Approach 2:
The patent introduces magnetic fields as an intermediary between the drilling tool and the borehole wall. Instead of direct mechanical contact, the magnetic field serves as the mediating force to transmit steering commands to the drill string, allowing directional control while maintaining operational efficiency
2Measurement precision
If expandable ribs or pads are actuated to apply force on borehole walls for steering, then directional control is achieved, but the mechanism complexity increases
Solution Approach 1:
The patent eliminates complex mechanical expandable ribs or pads by substituting them with a magnetic field-based steering system. The magnets and associated control mechanisms are simpler than the mechanical expansion and contact systems, reducing overall device complexity while maintaining steering capability
Solution Approach 2:
The patent extracts the contact-based steering components (expandable ribs, pads, and their actuation mechanisms) from the drilling tool design and replaces them with a non-contact magnetic field system, simplifying the overall steering mechanism
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 enables precise directional control and improved drilling efficiency by applying steering forces near the drill bit, resulting in enhanced operational efficiency and effective directional changes during drilling.
Implementation Method 1
a rotatable shaft (212) extending through a housing (214), where the shaft (212) and the housing (214) are separated by at least one bearing (230)
Implementation Method 2
a steering subsystem (228) configured to angulate the shaft (212) by exerting forces substantially through the pair of bearings (230)
Data Source
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AI summary
In certain embodiments, a steerable drilling tool is provided including a rotatable shaft extending through a housing where the shaft and the housing are separated by at least one bearing or two sets of bearings, the shaft having a first portion terminating at a first end of the shaft and a second portion terminating at a second end of the shaft. The steerable drilling tool may further include a drill bit structure operatively coupled to the first portion and a steering subsystem comprising a pair of bearings operatively coupled to the first portion. The steering subsystem may be configured to angulate the shaft by exerting force substantially through the pair of bearings. In certain embodiments, the first portion is between the first end and about one-third of the length of the shaft from the first end towards the second end.