Self-Adjusting Vibration Absorber for Downhole Resonance Avoidance
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Solution Overview
Problem
Existing vibration absorbers for downhole drilling instruments are ineffective due to fixed stiffness and damping, leading to resonance issues when the downhole vibration frequency matches the absorber's inherent frequency, and are further compromised by temperature changes, resulting in poor damping performance.
Innovation Solution
A self-adjusting damping vibration absorber system that includes a vibration monitor and controller tool to dynamically adjust the absorber's damping coefficient, utilizing an electroactive polymer damping adjustment layer and high-strength PEEK insulating components, allowing the absorber to change its inherent frequency and avoid resonance by monitoring and adapting to changing downhole conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If ordinary rubber vibration absorber is used with fixed stiffness and damping, then the structure is simple and easy to manufacture, but the vibration absorber cannot adapt to changing downhole vibration frequencies and temperatures, leading to resonance and poor damping performance
Solution Approach 1:
The patent applies the dynamics principle by making the vibration absorber's stiffness and damping characteristics adjustable rather than fixed. The electroactive polymer damping adjustment layer allows the absorber to dynamically change its mechanical properties in response to varying downhole conditions, enabling adaptation to different vibration frequencies while maintaining a relatively simple overall structure.
Solution Approach 2:
The patent implements parameter changes by using an electroactive polymer layer that can alter the damping coefficient and stiffness of the vibration absorber. By changing the electrical parameters (applying voltage) to the electroactive polymer, the mechanical parameters (damping and stiffness) are adjusted, allowing the absorber to match different downhole vibration frequencies and avoid resonance.
2Reliability
If the vibration absorber uses fixed damping coefficient, then the device is simple to operate, but resonance occurs when downhole vibration frequency matches the absorber inherent frequency, reducing reliability
Solution Approach 1:
The patent applies feedback by using a vibration monitor and controller tool that continuously monitors the downhole vibration frequency and adjusts the damping coefficient of the vibration absorber accordingly. The controller receives feedback from the vibration monitor and automatically modifies the electroactive polymer layer's properties to maintain optimal damping performance and avoid resonance, thereby improving reliability.
Solution Approach 2:
The vibration absorber system implements self-service through its automatic adjustment capability. The integrated monitor and controller enable the absorber to autonomously adapt to changing downhole conditions without requiring manual intervention, adjusting its damping coefficient in real-time to maintain optimal performance and prevent resonance.
3Reliability
If ordinary rubber material is used for the vibration absorber, then the manufacturing cost is low, but the rubber stiffness and damping change with temperature rise, causing the absorber to fail and cannot achieve good damping effect
Solution Approach 1:
The patent applies composite materials by combining traditional rubber or polymer materials with an electroactive polymer damping adjustment layer. This composite structure allows the base material to provide basic damping functionality while the electroactive polymer layer compensates for temperature-induced property changes, maintaining stable damping performance across varying temperatures through active adjustment.
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 system effectively adjusts to changing downhole vibration frequencies and temperatures, preventing resonance and achieving optimal vibration damping by dynamically altering its inherent frequency, thereby extending the service life of sensors and circuit boards.
Implementation Method 1
A self-adjusting damping vibration absorber for while-drilling instruments is provided. The vibration absorber body includes a vibration absorber shell, a vibration absorber core, a damping adjustment layer and a scotch; an outer side wall of the vibration absorber core is coated with the damping adjustment layer
Implementation Method 2
the vibration absorber body is configured to absorb vibration energy and accelerate vibration attenuation
Implementation Method 3
the scotch is capable of rotating along the limit ring groove
Data Source
AI summary
The present application relates to self-adjusting damping vibration absorbers, in particular to a self-adjusting damping vibration absorber for while-drilling instruments and an adjusting method thereof. The self-adjusting damping vibration absorber includes a vibration monitor and controller tool and a vibration absorber body. The vibration monitor and controller tool is mounted inside the downhole while-drilling instrument, one end of the vibration absorber body is connected to the vibration monitor and controller tool through an insulating connector, the joint is provided with an insulating pad, the other end is connected to a sensor or circuit board tool that needs vibration damping, and the inside of the vibration absorber body is provided with a damping adjustment layer made of an electroactive polymer. By controlling the magnitude of an applied voltage, the damping adjustment can be realized, and the damping adjustment layer has the characteristics of high response speed and high control precision. The self-adjusting damping vibration absorber of the present application can adjust the vibration absorber damping according to the changes of the downhole vibration and temperature, so that the vibration absorber inherent frequency avoids or is far away from the vibration frequency of the downhole while-drilling instrument so as to avoid resonance, and thereby, the vibration absorber achieves the best vibration damping effect.