Mandrel-Sleeve Tool with Spring Stack for Drill String Vibration
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Solution Overview
Problem
Drill strings and bottom hole assemblies are susceptible to axial, lateral, and torsional vibrations due to forces from the drill bit, mud motors, and well geometry, leading to reduced drilling efficiency, tool wear, and damage.
Innovation Solution
A vibration mitigation tool with a mandrel and sleeve configuration, featuring a spring stack and helical engagement, which absorbs both tensile and compressive forces, and includes a lubrication chamber for smooth operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a rigid drill string structure is used, then structural strength is maintained, but vibration and shock are not mitigated
Solution Approach 1:
The patent introduces a dynamic vibration mitigation tool that can move longitudinally and rotationally relative to the drill string while maintaining helical engagement. This dynamic capability allows the tool to absorb and mitigate vibrations and shocks without compromising the overall structural strength of the drill string assembly.
Solution Approach 2:
The vibration mitigation tool acts as an intermediary element between the drill string and the bottom hole assembly. It absorbs harmful vibrations and shocks through its movable components and helical engagement mechanism, protecting both the drill string and downhole tools from damage while maintaining structural integrity.
2Object-affected harmful factors
If vibration mitigation components are added, then vibration reduction is achieved, but device complexity increases
Solution Approach 1:
The vibration mitigation tool is designed to perform multiple functions simultaneously: it mitigates vibrations and shocks, maintains helical engagement with the drill string, provides longitudinal and rotational movement, and protects both upper and downhole components. This multi-functionality reduces the need for separate vibration control mechanisms.
Solution Approach 2:
The tool features a nested configuration where the mandrel portion and sleeve portion are arranged concentrically, with the helical engagement mechanism integrated within the sleeve. The lubrication chamber is positioned between the mandrel and sleeve, creating a compact nested structure that minimizes overall complexity while maintaining vibration mitigation capabilities.
3Force
If spring stack is used for force control, then tensile and compressive forces are controlled, but device complexity increases
Solution Approach 1:
The spring stack is configured to automatically control and absorb tensile and compressive forces without requiring external control systems. The springs self-adjust to the applied loads, providing passive force mitigation that simplifies the overall control mechanism while effectively managing forces during drilling operations.
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 tool effectively reduces vibrations, protecting the drill string and bottom hole assembly from wear and damage, enhancing drilling efficiency and maintaining tool integrity.
Implementation Method 1
a spring stack configured to control compression on the vibration mitigation tool through compression of the spring stack
Implementation Method 2
The mandrel portion and the sleeve portion, together, may form a lubrication chamber including a first or upper portion configured for lubricating a helical engagement
Implementation Method 3
a helical engagement between the mandrel portion and the sleeve portion
Data Source
AI summary
A vibration mitigation tool may include a mandrel portion, a sleeve portion arranged about the mandrel portion and configured to move longitudinally and rotationally relative to the mandrel portion. The tool may also include a spring stack configured to control compression on the vibration mitigation tool through compression of the spring stack and to control tension on the vibration mitigation tool through compression of the spring stack. A helical engagement between the mandrel portion and the sleeve portion may also be provided.