Steering System for Directional Drilling
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Solution Overview
Problem
Existing directional drilling methods lack precision and reliability, requiring complex and heavy equipment for fine control, which is costly and prone to malfunctions, and often limit access to 3-dimensional spaces due to limited direction change capabilities.
Innovation Solution
A steering system for directional drilling that uses longitudinal forces from actuators to bend the drill bit and extend/retract steering inserts to change drilling direction, allowing for precise control without special tools or complex mud motors, integrated with electronic feedback and computer control for enhanced precision.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If bent housing tools are used to change drilling direction, then direction change capability is achieved, but the process becomes time-consuming and requires frequent fitting and un-fitting of special tools
Solution Approach 1:
The drill string is transformed from a static, rigid structure to a dynamic, flexible system capable of active bending. Steerable sections with embedded actuators allow the drill string to dynamically change its curvature and direction during drilling operations, eliminating the need for frequent tool changes while maintaining adaptability.
Solution Approach 2:
The mechanical system of physically replacing bent housing tools is replaced with an actuated system where steering inserts and actuators enable direction changes through controlled bending moments. This substitution eliminates the need for mechanical tool changes while achieving the same directional control objective.
2Manufacturing precision
If mud motors are added to enable fine control of drilling direction, then steering precision is improved, but device complexity and mass increase significantly
Solution Approach 1:
The drill string is divided into discrete steerable sections, each capable of independent bending control through embedded actuators and steering inserts. This segmentation allows precise directional control to be achieved through coordinated activation of multiple simple segments rather than requiring a single complex mud motor system.
Solution Approach 2:
The complex mechanical mud motor system is replaced with a distributed actuation system using steerable sections with embedded actuators. This substitution achieves comparable or superior steering precision while dramatically reducing overall system complexity and eliminating the need for heavy hydraulic machinery.
3Adaptability or versatility
If mud motors are installed for directional control, then steering capability is improved, but the mass of the drill assembly increases
Solution Approach 1:
The static, heavy drill string is transformed into a dynamic system where steering sections can actively bend and change direction. This dynamic capability allows lightweight steerable sections with embedded actuators to replace heavy mud motors, achieving the same steering capability with significantly reduced mass.
Solution Approach 2:
The heavy mechanical mud motor system is replaced with lightweight steerable sections containing embedded actuators and steering inserts. This substitution maintains full steering capability while reducing the mass of the drill assembly, as the distributed actuation system requires far less material and structural support than centralized hydraulic motors.
4Adaptability or versatility
If available steering tools are used, then direction change is possible, but fine control and accuracy are limited by tool geometries
Solution Approach 1:
The fixed-geometry steering tools are replaced with a dynamic system where steerable sections can actively adjust their bending curvature through controlled actuator activation. This allows continuous, fine-grained control of the drilling direction rather than being constrained by discrete tool geometries, achieving superior positioning accuracy.
Solution Approach 2:
The drill string is segmented into multiple steerable sections, each capable of independent curvature control. This segmentation enables fine control through coordinated activation of individual sections, allowing precise adjustment of the overall bending profile and drilling trajectory beyond what single fixed-geometry tools can achieve.
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 provides improved steering accuracy and control, reduces equipment complexity and cost, and enables efficient access to 3-dimensional spaces by allowing seamless direction changes without the need for special tools or heavy machinery, enhancing drilling precision and reliability.
Implementation Method 1
at least one steering actuator capable of exerting a longitudinal force on the apparatus, so as to change the direction of drilling
Implementation Method 2
at least one drill bit steering insert, capable of extending and retracting so as to change the cutting characteristics of the drill bit
Data Source
AI summary
Provided is an apparatus for use in directional drilling, which apparatus comprises:(a) a drill bit;(b) at least one steering actuator capable of exerting a longitudinal force on the drill bit, so as to change the direction of drilling; and/or(c) at least one drill bit steering insert, capable of extending and retracting so as to change the cutting characteristics of the drill bit and thereby change the direction of drilling.Further provided is a method of directional drilling, employing the apparatus of the invention.