Drill Rod Stabilizing Projections for Buckling Resistance
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Solution Overview
Problem
Drill rods are prone to failure due to buckling, twisting, and cracking caused by interference fits at the box end and overloading at the pin end, leading to instability and reduced lifespan during drilling operations.
Innovation Solution
The introduction of stabilizing projections, such as wear strips, extending outwardly from the circumference of the drill rod, spaced at least 40 cm from the first end, which are bonded to the outer surface and optionally formed in a helical orientation to enhance stability and reduce wear, thereby minimizing contact with the borehole wall and promoting fluid flow.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If stabilizing projections are added to the drill rod, then stability and lifespan are improved, but device complexity increases
Solution Approach 1:
The patent applies local quality by adding stabilizing projections only at specific locations along the drill rod body, rather than modifying the entire structure. These projections are positioned at predetermined intervals to provide localized stabilization where needed, maintaining simplicity in non-critical areas while enhancing stability in critical zones prone to buckling and twisting.
Solution Approach 2:
The stabilizing projections segment the drill rod surface into distinct functional zones. Each projection acts as an independent stabilizing element that contacts the borehole wall separately, distributing stabilization forces along the drill rod length and reducing overall structural complexity compared to a continuous stabilization system.
2Stability of the object's composition
If stabilizing projections extend outwardly from the drill rod circumference, then contact with borehole wall is increased for stability, but drag and resistance increase
Solution Approach 1:
The stabilizing projections extend outwardly only to the degree necessary to establish contact with the borehole wall for centralization, rather than forming large protrusions. This partial action provides sufficient stabilization to prevent buckling and twisting while minimizing the surface area in contact with the wall, thereby reducing drag and resistance forces.
Solution Approach 2:
The projections create localized contact points with the borehole wall rather than continuous contact along the drill rod surface. This localized interaction provides the necessary stabilizing force while minimizing overall friction and drag, as only discrete portions of the drill rod surface engage with the wall at any given time.
3Ease of operation
If stabilizing projections are spaced at least 40 cm from the first end, then conventional gripping is maintained, but stability near the box end is reduced
Solution Approach 1:
The patent applies local quality by deliberately excluding stabilizing projections from the box end region within 40 cm of the first end. This creates a clear distinction between the gripping zone (box end) and stabilization zones (remaining drill rod body), allowing conventional gripping tools to access the box end without interference while providing stability through projections positioned at optimal locations further along the rod.
Solution Approach 2:
The design extracts the stabilizing function from the box end region and relocates it to predetermined positions along the drill rod body. This separation allows the box end to retain its original gripping functionality while the stabilizing projections at other locations provide the necessary structural support, effectively removing the conflict between gripping access and stabilization needs.
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 stabilizing projections centralize the drill rod, reduce deformation, and increase its lifespan by minimizing contact and drag, while allowing conventional gripping and maintaining contact across the borehole circumference, thus reducing the likelihood of catastrophic failure.
Implementation Method 1
The stabilizing projections centralize the drill rod, reduce deformation, and increase its lifespan by minimizing contact and drag
Implementation Method 2
a method comprises cladding, by a laser, a plurality of wear strips to an outer surface of a pin end portion of a drill rod
Data Source
AI summary
A drill rod having a central axis can comprise a hollow, elongate body having a box end portion defining a first end of the elongate body and an opposing pin end portion. The elongate body can have an outer surface that defines a circumference of the elongate body. A plurality of stabilizing projections can extend outwardly from the circumference of the elongate body. The plurality of stabilizing projections can be spaced from the first end by at least 40 cm. The plurality of stabilizing projections can be spaced about the circumference of the elongate body.