Guide Adapter Radial Elements Percussion Drilling Deviation
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Solution Overview
Problem
Percussion drilling methods face increased risk of bore hole deviation as the drill string length increases, necessitating a guide adapter to provide additional support and guidance for the drill bit while minimizing weight and friction.
Innovation Solution
A guide adapter with radially extending guiding elements, primarily at the rear end, matching the drill bit's radius, and featuring a tapered or curved design to reduce weight and friction, along with a hard layer for wear resistance, and a wear indicator for timely replacement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If the drill string length is increased to reach greater bore hole depths, then the drilling depth capability is improved, but the risk for deviation from the intended straight direction increases
Solution Approach 1:
A guide adapter is introduced as an intermediary component between the drill string and drill bit. The guide adapter includes guiding elements that extend radially outward to contact the bore hole walls, providing additional support and guidance to maintain the drill bit's alignment with the intended bore hole direction, thereby compensating for the increased deviation risk from longer drill strings
Solution Approach 2:
The solution adds a radial dimension to the support structure by extending guiding elements outward from the adapter body. These guiding elements contact the bore hole walls in the radial direction, providing lateral support that constrains the drill bit's movement and prevents deviation from the axial drilling direction
2Manufacturing precision
If a guide adapter is added to provide additional support and reduce deviation, then the bore hole straightness is improved, but the weight of the drilling system increases
Solution Approach 1:
The guide adapter is designed as a separate, modular component that can be attached to the drill string. The adapter body and guiding elements are segmented into discrete structural components, allowing for optimized material distribution that provides necessary support function while minimizing overall weight compared to a solid continuous structure
Solution Approach 2:
The guiding elements are positioned locally at specific locations around the adapter body, extending radially only where needed to contact the bore hole walls. This localized structural arrangement provides guidance support precisely where required while avoiding unnecessary material in other regions, thereby reducing overall weight
3Manufacturing precision
If guiding elements extend along the entire adapter body length, then the guiding support is improved, but the friction between guide elements and bore hole increases
Solution Approach 1:
The guiding function is extracted and concentrated specifically to the rear end portion of the adapter body, where the guiding elements are positioned to contact the bore hole walls. By removing the guiding elements from the forward end and intermediate sections, the design eliminates unnecessary friction in those regions while maintaining effective guiding support at the critical rear end location
Data Source
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AI summary
The present invention relates to a guide adapter (100) for guiding a drill bit during percusion drilling, said guide adapter is intended to be arranged between the drill bit and an elongated drill string extending along an axis A, said drill bit having a first radius (Rf) transverse to axis A. The guide adapter comprises: a sleeve shaped adapter body (101) intended to extend along axis A and comprising a forward end (102) with a first coupling (104) intended for connecting the guide adapter to the drill bit, and a rear end (103) with a second coupling (105) intended for connecting the guide adapter (100) to the drill string; and a plurality of guiding elements (106) extending substantially radially in relation toaxis A from the sleeve shaped adapter body (101), wherein the guiding elements (106) extend along 60% or less of the adapter body length (L) along axis A and are arranged in the rear end (103) of the adapter body (101), said guiding elements (106) in the rear end (103) has an extension in radial direction from axis A substantially equal to said first radius (Rf) and curved, straight or stepwise reduced radial extension towards the forward end along axis A. The invention furthermore relates to a drill arrangement comprising the guide adapter.