Downhole Vibratory Tool with Longitudinal Mandrel Bore
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Solution Overview
Problem
Current downhole drillstring vibration tools obstruct the passage of tools like logging or fishing tools due to their operational design, limiting their use below the vibratory tool's depth.
Innovation Solution
A downhole vibratory tool with a rotating rotor and longitudinally movable mandrel, featuring cam profiles that create a back-and-forth movement, allowing for vibration generation while permitting tool passage through longitudinal bores, and including a retrievable flow nozzle and segmented mandrel with spring bias for enhanced functionality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If hydraulic tools are used to induce vibrations by obstructing the bore, then vibration induction is achieved, but passage of downhole tools through the vibratory tool is blocked
Solution Approach 1:
The tool is divided into a stationary housing and a movable mandrel that can slide longitudinally within the housing. The mandrel contains a longitudinal bore that allows passage of downhole tools, while the cam profiles on the mandrel and housing work together to generate vibrations when the drillstring rotates, eliminating the need to obstruct the entire bore.
Solution Approach 2:
Instead of obstructing the bore in the radial direction (as hydraulic tools do), this invention generates vibrations through longitudinal movement of the mandrel within the housing. The cam profiles convert rotational motion into axial oscillation, allowing the bore to remain open for tool passage while still achieving vibration induction through a different dimensional mechanism.
2Use of energy by moving object
If the bore is partially obstructed to generate vibrations, then vibration induction is achieved, but the tool complexity increases and operational flexibility is reduced
Solution Approach 1:
The mandrel is designed to move dynamically within the housing rather than being a fixed obstruction. The cam profiles create a dynamic interaction between the rotating drillstring and the movable mandrel, generating vibrations through controlled longitudinal oscillation. This dynamic approach is simpler than creating complex obstructing structures while maintaining vibration induction effectiveness.
Data Source
AI summary
A downhole vibratory tool for placement in drillstrings which creates vibration in the drillstring while drilling. A rotary drive rotates in response to fluid flow through it, rotating a rotor having a lower end engaging an upper end of a mandrel. The mandrel is held in a main body such that it is rotationally locked with respect to the main body, but can move longitudinally within a restricted range. The lower end of the rotor and the upper end of the mandrel have interfacing surfaces. Rotation of the rotor and interaction of the interfacing surfaces creates a back-and-forth movement of the mandrel with respect to the rest of the tool, creating the desired vibratory motion.