Downhole Vibration Dampener Using Drilling Fluid and Anti-Rotation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing downhole vibration dampener devices fail to effectively absorb axial, lateral, and torsional shocks, and low-frequency vibrations, leading to damage of instrumentation during drilling, and often require complex maintenance due to hydraulic fluid leakage and premature spring wear.
Innovation Solution
A dampener device incorporating a main spring and secondary springs with elastomeric ribbons, utilizing drilling fluid as a vibration dampening medium, and featuring anti-rotation structures to prevent rotation and enhance torsional shock absorption, eliminating the need for hydraulic fluid and simplifying maintenance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If hydraulic fluid is used as a dampening medium, then vibration dampening capability is improved, but maintenance complexity increases due to fluid leakage
Solution Approach 1:
The dampener uses drilling fluid that is already present in the wellbore environment, eliminating the need for separate hydraulic fluid reservoirs and seals. The drilling fluid automatically enters the dampener through openings in the sleeve, providing self-service dampening without requiring maintenance of fluid containment systems.
Solution Approach 2:
The invention extracts the dampening function from a sealed hydraulic system and integrates it directly with the drilling fluid circulation system. By removing the need for enclosed hydraulic fluid and seals, the design eliminates leakage problems while maintaining vibration dampening capability through direct exposure to drilling fluid.
2Reliability
If complex seal systems are used to prevent hydraulic fluid leakage, then reliability is improved, but device complexity increases
Solution Approach 1:
The invention completely removes the seal system from the dampener design by eliminating the enclosed hydraulic fluid requirement. The dampener operates with openings in the sleeve that allow drilling fluid to freely enter and exit, eliminating seals, gaskets, and associated complex components while preventing leakage by design.
Solution Approach 2:
The dampener leverages the naturally present drilling fluid in the wellbore environment, eliminating the need for separate fluid containment systems. The drilling fluid itself serves the dampening function without requiring complex sealing mechanisms to prevent leakage.
3Reliability
If springs are used for vibration absorption, then shock dampening capability is improved, but durability decreases due to premature spring wear
Solution Approach 1:
The invention changes the operational parameters of the springs by immersing them in drilling fluid, which provides lubrication and reduces friction during compression and expansion cycles. This environmental parameter change extends spring service life while maintaining shock dampening capability.
Solution Approach 2:
The drilling fluid acts as an intermediary between the spring and the external environment, providing lubrication and reducing wear on the spring components. The fluid mediates the interaction between moving parts, extending their service life while maintaining dampening performance.
4Ease of operation
If rotation is allowed in the dampener, then ease of installation is improved, but torsional shock absorption capability decreases
Solution Approach 1:
The invention introduces asymmetric features (keyways, splines, or offset mounting points) that prevent rotation in only one specific orientation. This asymmetric constraint provides torsional resistance and shock absorption capability while still allowing straightforward installation by aligning the asymmetric features during installation.
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 device provides enhanced vibration and shock absorption, preventing damage to downhole instrumentation while reducing maintenance costs and complexity by using drilling fluid as a dampening medium and improving rotational torque dampening capabilities.
Implementation Method 1
a main spring and secondary springs with elastomeric ribbons, utilizing drilling fluid as a vibration dampening medium
Implementation Method 2
utilizing drilling fluid as a vibration dampening medium
Implementation Method 3
featuring anti-rotation structures to prevent rotation and enhance torsional shock absorption
Data Source
AI summary
A dampener device configured for incorporation into a downhole tool in a drilling system for absorbing axial, lateral and torsional shocks and vibrations to protect instrumentation during a drilling process includes a main sleeve having a main cavity containing a main spring and a first elastomeric ribbon interleaved between coils of the main spring. An adapter is connected to or formed monolithically relative to the main sleeve. The adapter is configured for connection to a first tool component. A plunger is configured to compress the main spring and a connector is configured for connection to a second tool component. The connector is attached to or formed monolithically relative to the plunger. A shaft extends between the adapter and the connector. The shaft is provided with an anti-rotation structure.