Downhole Ball Screw Assembly for Torsional Shock Damping
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Solution Overview
Problem
Conventional downhole drilling equipment lacks effective solutions for fully addressing torsional shock and vibration, which can lead to drill bit and drill string damage and inefficiencies in drilling operations.
Innovation Solution
A downhole tool apparatus featuring an outer cylindrical body with inner grooves and balls that recirculate, combined with a fluidic diode for axial motion dampening and customizable spring assemblies to manage torsional and axial movements, providing a more responsive and sensitive drilling system.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional dampening elements are used to reduce torsional shock and vibration, then drill string and drill bit damage is reduced, but the dampening effectiveness is insufficient and the system remains overly sensitive to torsional disturbances
Solution Approach 1:
The dampening element is segmented into multiple independent balls (at least two balls) that can move individually within separate grooves. This segmentation allows each ball to independently absorb and dissipate torsional energy, providing more effective dampening compared to conventional unified dampening elements. The multiple balls create multiple contact points with the drill string, distributing the dampening force more effectively throughout the drill string assembly.
Solution Approach 2:
The dampening element employs dynamic grooves that are configured to move relative to the drill string during rotation. The grooves have varying cross-sectional areas along their length, creating dynamic resistance to ball movement. This dynamic configuration allows the dampening force to vary with rotational speed and torsional load, providing adaptive dampening that is more effective across different drilling conditions than static dampening elements.
2Stability of the object's composition
If the drill string is made more rigid to reduce vibration, then structural stability is improved, but the system becomes less sensitive and responsive to drilling conditions
Solution Approach 1:
The dampening element acts as an intermediary between the drill string and the torsional disturbances. Rather than making the drill string itself more rigid, the intermediate dampening element (comprising balls in grooves) absorbs and dissipates torsional energy, protecting the drill string while allowing it to maintain its natural flexibility and responsiveness to drilling conditions.
3Reliability
If conventional dampening components are used, then the drill string is protected from excessive vibration, but the complexity of the dampening system increases without sufficient performance improvement
Solution Approach 1:
The dampening element is designed to be a replaceable, modular component that can be easily discarded and replaced. The simple construction of balls within grooves allows for easy manufacturing, installation, and replacement without complex assembly procedures. This modular approach reduces overall system complexity compared to integrated, non-replaceable dampening systems while maintaining effective vibration protection.
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 reduces torsional shock and vibration, enhancing drilling efficiency by allowing for precise control of axial and torsional movements, thus minimizing damage and improving drilling performance.
Implementation Method 1
A plurality of balls 14 are positioned within a cavity 26 formed by the grooves 11a, 11b
Implementation Method 2
downhole tool for dampening torsional shock and vibration of a drill string and drill bit
Implementation Method 3
A fluidic diode 12a may be positioned adjacent to the internal shoulder 12
Implementation Method 4
Some embodiments may include a spring assembly 18, 19, 24, 25
Data Source
AI summary
A downhole tool has a main body that is cylindrical and includes a top coupling that couples to a drill string. A second body that is cylindrical is positioned at least partially within the main body. The second body has a bottom coupling that couples to a drill bit. Springs are positioned within the downhole tool and transmit an axial force to the drill bit. A first set of grooves is formed on an interior of the main body, and a second set of grooves is formed on an exterior of the second body. Balls travel within the first and second sets of grooves. At least some of the balls simultaneously engage the main body and the second body.