Downhole Force Dampener With Telescopic Shaft for Drillstring Vibration
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Solution Overview
Problem
Existing technologies fail to effectively dampen axial, lateral, and torsional forces within drillstrings, leading to equipment failures and interference with drilling dynamics, while also compromising throughbore pressures and alignment integrity.
Innovation Solution
A downhole tool with a compression housing and a torsional housing, featuring a sliding shaft, first and second spring assemblies, and a pressure compensation system, designed to dampen forces and maintain alignment integrity within the drillstring.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If collar based solutions are used to dampen forces, then equipment protection is improved, but device length increases by 2.5m and serviceability deteriorates
Solution Approach 1:
The force dampening elements are nested within the existing drill string structure, with dampeners positioned inside the drill string rather than adding external collars. This allows the damping function to be integrated without significantly increasing the overall package length.
Solution Approach 2:
The dampening system is divided into multiple discrete force dampening elements distributed along the drill string, rather than using a single large collar. This segmentation allows for compact integration while maintaining effective damping across multiple axes.
2Reliability
If collar based solutions are used to dampen forces, then equipment protection is improved, but ease of repair deteriorates
Solution Approach 1:
The dampening system uses multiple independent force dampening elements that can be individually accessed and replaced. Each dampener is a separate component that can be serviced without requiring replacement of the entire sensing package, improving ease of repair.
3Object-affected harmful factors
If snubbers are used to dampen forces, then shock isolation is improved, but device durability deteriorates under increasing shock loads
Solution Approach 1:
The force dampening elements use composite structures combining rubber material with internal reinforcement elements. This composite construction provides both shock isolation and high durability, allowing the dampeners to withstand increasing shock and vibration loads without destruction.
Solution Approach 2:
The rubber-based force dampening elements provide continuous cushioning before shock loads reach the sensitive equipment. The dampeners are pre-positioned to absorb and dissipate energy from axial, lateral, and torsional forces, protecting the equipment from peak shock loads.
4Reliability
If collar based solutions are used, then force dampening is improved, but drilling dynamics are interfered with
Solution Approach 1:
The force dampening action is localized to specific points where dampening elements are positioned within the drill string, rather than using large collars that affect the entire drill string. This localized approach provides effective dampening while minimizing interference with overall drilling dynamics and rate of penetration.
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 shock and vibration forces, preventing equipment failures and maintaining drilling efficiency by ensuring throughbore pressure integrity and alignment alignment, even under high drilling stress conditions.
Implementation Method 1
a first spring assembly operatively contained between the compression housing and the sliding shaft for dampening compression forces between the sliding shaft and the compression housing
Implementation Method 2
The rubber is then is encapsulated in a metal shell that is attached to a housing that the PCB carrier is contained in
Implementation Method 3
the torsional housing has at least one longitudinal slot operatively containing at least one pin which is engaged in a recess on the sliding shaft to allow axial movement and limit rotational movement
Data Source
AI summary
A downhole tool for dampening vibrational, lateral, compressive, and tensile forces exerted on sensor equipment inside a drillstring is described. The downhole tool is housed inside the drill string. The tool generally includes a bottom end shaft for connection to the drillstring and that is telescopically engaged within a compression housing and a torsional housing. The torsional housing enables the bottom end shaft to slide axially with respect to the torsional housing whilst preventing torsional movement of the bottom end shaft relative to the torsional housing. The compression housing is connected to the sensor equipment and operatively contains a first spring between the compression housing and the bottom end shaft that absorbs compression forces between bottom end shaft and compression housing.