Drill Bit Housing Vibrator for Coiled Tubing Drag Reduction
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Solution Overview
Problem
Conventional and coiled tubing drilling rigs face challenges in advancing tubing further into the wellbore due to insufficient weight to overcome frictional forces, especially in deviated and horizontal wells, where coiled tubing is prone to drag and sticking issues.
Innovation Solution
A vibration system integrated into the drill bit housing, utilizing a symmetrical rotatable member and mechanical interconnections to produce vibrations aligned with the drilling string, combined with a gyroscopic effect from the rotating mass, to enhance downward movement and stability of the tubing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If coiled tubing is used instead of conventional drill pipe, then setup time and cost are reduced, but drag and sticking problems increase due to flexibility and lighter weight
Solution Approach 1:
The patent applies mechanical vibration through a vibratory tool that generates oscillating motion to counteract frictional forces between the coiled tubing and wellbore. The vibration creates dynamic forces that help overcome the sticking and drag problems inherent to flexible, lightweight coiled tubing, enabling deeper penetration without increasing tubing weight or rigidity.
2Force
If drill string weight is increased to overcome frictional forces, then downward movement is improved, but coiled tubing becomes more prone to lodging due to its flexible and lighter nature
Solution Approach 1:
The vibratory tool generates oscillating forces that dynamically counteract friction without requiring increased static weight. This approach provides the necessary downward force to overcome frictional resistance while maintaining the lightweight, flexible characteristics of coiled tubing, thereby avoiding lodging problems.
3Force
If vibrating tools are used to overcome drag, then downward movement is enhanced, but energy efficiency is reduced due to ineffective utilization of created forces
Solution Approach 1:
The patent employs a vibratory tool designed to generate controlled oscillations that efficiently transfer energy to overcome friction. By optimizing the vibration characteristics and mechanical transmission, the system maximizes the useful work done by vibrational forces while minimizing energy dissipation, thereby improving overall energy efficiency.
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 vibration system effectively reduces drag and stabilizes the tubing within the wellbore, allowing for deeper drilling and smoother operation by utilizing drilling fluid flow to create vibrations and a gyroscopic effect that counters friction and maintains directional accuracy.
Implementation Method 1
provide a stabilizing gyroscopic effect due to rotation of a symmetrical mass around the axis of the tool
Implementation Method 2
a symmetrical rotatable member positioned within said drill bit housing to rotate in response to drilling fluid flow through said drill bit housing, and a mechanical interconnection to said rotatable member whereby said rotatable member and said mechanical interconnection operate to produce vibrations within said drill bit housing
Data Source
AI summary
A vibration system for drill bit housing and method is disclosed, which may be utilized to assist in lowering a drill string into a wellbore through which drilling fluid is pumped. In one embodiment, a drill bit housing contains a symmetrical rotatable member positioned to rotate in response to drilling fluid pumped through the housing, whereby a mechanical interconnection connected to the rotatable member produces vibrations within the drill bit housing for advancing bottom hole assemblies.