Core Barrel Vibration Damping via Single-Thread Holder
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Solution Overview
Problem
Conventional core barrels face issues with axial vibrations causing jamming and thread damage during core drilling, leading to misalignment of core bit and removal elements, and require numerous threads and parts, which complicates the equipment and increases the risk of disconnection.
Innovation Solution
A core barrel design incorporating a spacer element with a spring member that absorbs axial vibrations, reducing thread damage and simplifying the equipment by using fewer threads and parts, with a locking mechanism to maintain the axial position of the inner assembly relative to the outer assembly, and a single connecting thread for depth adjustment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional core barrels use multiple threads and parts to connect outer and inner assemblies, then the equipment can accommodate adjustments, but the complexity increases and the risk of disconnection due to vibrations increases
Solution Approach 1:
The patent merges multiple connection functions into a single robust thread that simultaneously provides both adjustment capability and secure connection. The holder assembly uses one thread to both position the inner assembly axially and lock it against vibrational disconnection, eliminating the need for separate adjustment mechanisms and locking devices.
Solution Approach 2:
The single thread in the holder assembly serves multiple functions: it provides axial positioning of the inner assembly, enables depth adjustment of core removal elements, and acts as a locking mechanism against vibrational forces. This multi-functional design reduces part count while maintaining adaptability.
2Adaptability or versatility
If conventional core barrels use multiple threads and seals, then adjustments can be made, but thread damage and disconnection risks increase under axial vibrations
Solution Approach 1:
By combining adjustment and locking functions into a single thread assembly, the patent reduces the number of potential failure points. Fewer threads mean fewer locations where damage can occur, and the integrated design ensures that adjustment and locking are achieved through the same robust connection.
Solution Approach 2:
The holder assembly is designed with sufficient thread engagement length and appropriate thread geometry to withstand axial vibrations before damage can occur. The design anticipates vibrational loads and incorporates sufficient safety margin in the single connection point.
3Manufacturing precision
If conventional core barrels use numerous threads for connection, then positioning can be adjusted, but the equipment becomes more complex and prone to jamming
Solution Approach 1:
The patent combines axial positioning and depth adjustment functions into a single thread mechanism on the holder assembly. This single thread provides both the precise axial positioning of the inner assembly and the depth adjustment of core removal elements, eliminating the need for multiple separate adjustment threads.
4Manufacturing precision
If conventional core barrels use multiple parts for holding inner assembly, then positioning can be adjusted, but axial vibrations cause misalignment of core bit and removal elements
Solution Approach 1:
The holder assembly merges the functions of supporting the inner assembly and positioning core removal elements into a single integrated component. This unified structure ensures that axial vibrations affect the entire assembly uniformly, maintaining the relative alignment between the core bit and removal elements while reducing the number of separate parts.
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 effectively dampens axial vibrations, maintains the inner assembly's stable position, reduces thread wear, and ensures secure core removal by eliminating the need for multiple threads and seals, enhancing the robustness and reliability of the drilling apparatus.
Implementation Method 1
The spring member, which is preferably prestressed, has the effect, when axial vibrations of the inner assembly occur, of absorbing these vibrations and therefore filtering them.
Implementation Method 2
The spring member, which is preferably prestressed, has the effect, when axial vibrations of the inner assembly occur, of absorbing these vibrations and therefore filtering them.
Implementation Method 3
a holder for holding the inner assembly in the outer assembly which comprise at least one rolling bearing arranged between them so that these assemblies are reciprocally free in rotation.
Data Source
AI summary
There is disclosed herein drilling apparatus, in particular for use in the field of oil prospecting, comprising: a first tubular member (1, 2, 3); a second tubular member (6, 7, 8, 9) mounted at least partly within the first tubular member so as to be reciprocally free in rotation with respect to the first tubular member about an axis (5); and a drill bit (4) operatively connected to one of the first or second tubular members so as to be rotated in response to the one tubular member being turned in order to effect drilling, characterized in that: the drilling apparatus further comprises a restoring member (18, 36) for applying a forces between the first tubular member and the second tubular member at least in respective first axial directions in response to relative displacement of the first tubular member and the second tubular member in the respective opposite axial directions. Also provided are a tubular assembly and a method of assembling tubular members.