Downhole Probe Centralizer Vibration Damping

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Solution Overview

Problem

Existing systems for supporting downhole electronics in subsurface drilling lack effective protection against mechanical shocks, vibrations, and other harsh downhole conditions.

Innovation Solution

A centralizer system comprising an elongated tubular member with outwardly-convex and inwardly-concave lobes, designed to contact the bore wall of a drill string at multiple points, providing axial support and damping of vibrations for downhole electronics.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If downhole electronics are placed in the drill string bore, then telemetry data can be collected and transmitted, but the electronics are subjected to high pressures, shocks and vibrations that reduce reliability

Engineering Contradiction:

Improvereliability of downhole electronicsVSAvoidmechanical shocks and vibrations

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The patent applies beforehand cushioning by providing a centralizer with elastomeric elements positioned between the downhole electronics and the drill string bore wall before the electronics are subjected to mechanical shocks and vibrations. The elastomeric elements are pre-installed to absorb and dampen mechanical stresses, protecting the electronics during drilling operations. This prior cushioning arrangement prevents direct transmission of high pressures and vibrations to the electronic components, thereby maintaining reliability in harsh downhole conditions.

Inventive Principle:

Principle #11Beforehand cushioning (Prior cushioning)

2Reliability

If a centralizer is used to support downhole electronics, then the electronics are protected from mechanical shocks, but the centralizer structure adds complexity to the drill string assembly

Engineering Contradiction:

Improveprotection of downhole electronicsVSAvoidcomplexity of centralizer structure

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent applies segmentation by dividing the centralizer into multiple discrete components: a support structure with multiple separate elastomeric elements positioned at different locations around the bore. This segmented approach allows each elastomeric element to independently absorb shocks from different directions, providing comprehensive protection while maintaining a relatively simple overall structure that can be integrated into the drill string assembly without excessive complexity.

Inventive Principle:

Principle #1Segmentation

3Reliability

If the centralizer contacts the bore wall at multiple points, then vibrations are damped effectively, but the manufacturing precision required for the lobes increases

Engineering Contradiction:

Improvevibration damping effectivenessVSAvoidprecision of lobe geometry

Core Design Contradiction:

ReliabilityVSManufacturing precision

Solution Approach 1:

The patent applies local quality by providing elastomeric elements at specific localized positions around the centralizer support structure, rather than requiring the entire structure to have uniform vibration-damping properties. The lobes are formed to contact the bore wall at discrete spots spaced around the circumference, with elastomeric material applied locally at these contact points. This approach achieves effective vibration damping through strategic placement of damping elements while reducing the overall manufacturing precision requirements compared to a fully uniform design.

Inventive Principle:

Principle #3Local quality

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 centralizer effectively protects downhole electronics by distributing mechanical loads, reducing vibrations, and maintaining the electronics centralized within the bore, thereby enhancing their longevity and operational reliability.

Implementation Method 1

The centralizer comprises a support structure and a plurality of elastomeric elements. The elastomeric elements are secured to the support structure in a spaced-apart arrangement about a longitudinal axis of the centralizer with the inwardly convex outer surfaces of the elastomeric elements facing the bore wall of the drill string.

Methodology Applied

Scientific EffectElasticity: Elasticity

Implementation Method 2

The inwardly convex outer surfaces of the elastomeric elements are arranged to contact the bore wall of the drill string. The elastomeric elements provide damping of vibrations and shocks while protecting the downhole electronics package.

Methodology Applied

Scientific EffectVibration damping: Damping

Data Source

PatentUS12297735B2Centralizer for downhole probes

Publication Date: 2025.05.13 BAKER HUGHES CANADA CO

AI summary

An assembly for use in subsurface drilling includes a downhole probe supported by a centralizer. The centralizer comprises a tubular member that extends around the downhole probe. A wall of the centralizer is fluted to provide inward contact points that support the downhole probe and outward contact points that bear against a bore wall of a section of drill string. The downhole probe may be supported for substantially its entire length.