Temperature-Responsive Work String Damper for Downhole Vibration
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Solution Overview
Problem
Downhole equipment experiences damage due to vibrations and shocks during drilling, completion, stimulation, and production operations in boreholes.
Innovation Solution
A work string comprising an outer member, an inertial mass within the outer member, and a damping element between them, where the damping element includes a liquid with viscosity that increases with temperature, effectively absorbing vibrations and shocks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional damping materials are used in downhole environments, then the equipment structure is simple, but the damping effectiveness deteriorates at elevated temperatures
Solution Approach 1:
The patent changes the physical parameter of the damping material by using a liquid with temperature-dependent viscosity characteristics. The liquid's viscosity increases with temperature, which compensates for the thermal softening of the surrounding structure, maintaining optimal damping performance across a wide temperature range from -40°F to 200°F.
Solution Approach 2:
The patent creates a composite damping system by combining a liquid damping material with a porous or cellular solid matrix. This composite structure allows the liquid to remain contained while providing the temperature-compensating viscosity characteristics that maintain damping effectiveness at elevated downhole temperatures.
2Object-affected harmful factors
If viscous damping materials are used, then vibration absorption is improved, but the material viscosity decreases at high temperatures reducing effectiveness
Solution Approach 1:
The patent exploits the parameter change of viscosity with temperature by selecting a liquid whose viscosity increases as temperature rises. This inverse relationship compensates for the thermal softening of the structure, ensuring that the damping force remains effective even as the surrounding materials become more compliant at high temperatures.
Solution Approach 2:
The patent converts the harmful effect of high temperature (which normally reduces material stiffness and damping capacity) into a benefit by using a liquid whose viscosity increases with temperature. The thermal energy that would normally degrade damping performance instead enhances the liquid's viscous resistance to vibration.
3Ease of manufacture
If the damping element uses temperature-independent material, then the system is simple to manufacture, but the damping performance varies significantly with temperature changes
Solution Approach 1:
The patent deliberately selects a liquid material whose viscosity parameter changes with temperature in a controlled manner. This temperature-dependent parameter change provides automatic compensation for thermal effects, delivering consistent damping performance across the full operating temperature range without requiring complex active control systems.
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 the impact of vibrations and shocks on downhole equipment, preventing premature damage and improving measurement quality during downhole operations.
Implementation Method 1
a damping element between the outer member and the inertial mass, the damping element including a liquid
Implementation Method 2
a liquid having a viscosity that increases with increasing temperature
Data Source
AI summary
A work string and method of absorbing a vibration at the work string. The work string includes an outer member, an inertial mass disposed within the outer member and a damping element between the outer member and the inertial mass. The damping element includes a liquid having a viscosity that increases with increasing temperature. The damping element absorbs the vibration being transferred from the outer member to the inertial mass.