Downhole Probe Centralizer Vibration Damping
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Solution Overview
Problem
There is a need for cost-effective and easily serviceable ways to support downhole probes in subsurface drilling, which are exposed to harsh conditions such as high temperatures, vibrations, and high pressures, leading to shortened lifespan and increased failure rates.
Innovation Solution
A downhole assembly comprising a drill string section with a centralizer that includes centralizing features to securely position and protect the downhole probe, allowing for the flow of drilling fluid around it, and is made from materials like PEEK or PET plastics that can withstand extreme conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If downhole probes are used to measure properties of geological formations and monitor downhole conditions, then data acquisition and drilling monitoring capabilities are improved, but the probes are exposed to harsh conditions (high temperatures, vibrations, high pressures) that shorten their lifespan and increase failure rates
Solution Approach 1:
The patent applies beforehand cushioning by providing a centralizer with shock-absorbing elements and vibration-damping features that are pre-installed in the drill string section. These elements cushion the downhole probe against mechanical shocks and vibrations before they can cause damage, thereby extending probe lifespan and reducing failures in harsh downhole conditions.
Solution Approach 2:
The centralizer acts as an intermediary component between the drill string section and the downhole probe. It provides mechanical support, centralizes the probe within the drill string bore, and isolates the probe from direct exposure to harmful vibrations and shocks, thereby protecting the probe while maintaining its measurement functionality.
2Strength
If traditional metallic centralizers are used to support downhole probes, then structural strength and durability are improved, but the cost increases and serviceability decreases
Solution Approach 1:
The patent applies parameter changes by transitioning the centralizer material from traditional metals to advanced polymer materials (such as PEEK or PET). This material substitution maintains the necessary structural strength and rigidity while significantly reducing cost, improving ease of manufacture, and enhancing serviceability through lighter weight and corrosion resistance.
Solution Approach 2:
The patent employs composite materials by using reinforced polymers (such as carbon-fiber-reinforced PEEK or glass-fiber-reinforced PET) for the centralizer. These composite materials provide sufficient mechanical strength and stiffness to support the downhole probe while being more cost-effective and easier to manufacture than traditional metallic centralizers, and offer superior corrosion resistance in harsh downhole environments.
Data Source
AI summary
An assembly for use in subsurface drilling includes a downhole probe supported in a drill string section by centralizing features of a centralizer that is slidably removable from the drill string section. The centralizer may comprise a tubular body having a bore defined through it. A bore wall of the centralizer is fluted to provide inward contact points that support the downhole probe. The downhole probe may be supported for substantially its entire length. The centralizer may optionally comprise and/or be coated with a vibration damping and/or electrically insulating material.