Borehole Sensor Clamp Arm Actuation

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Solution Overview

Problem

Conventional borehole sensing systems face challenges in stabilizing sensors within boreholes due to high costs, inconsistent reliability, technical complexity, and the need for continuous power to maintain clamping force, while passive systems fail to achieve sufficient clamping force and create drag issues.

Innovation Solution

A sensing system with a clamp arm that moves between retracted and extended positions, actuated by an energy storage element, providing a robust and low-drag clamping mechanism that requires no external power for maintaining clamping force, using remote actuation and energy storage elements like springs or shape memory alloys to secure sensors within boreholes.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Force

If motorized actuators (electrical or hydraulic) are used to clamp the sensor, then the clamping force can be maintained, but the system cost increases, reliability becomes inconsistent, and technical complexity increases

Engineering Contradiction:

Improveclamping forceVSAvoidactuator complexity

Core Design Contradiction:

ForceVSDevice complexity

Solution Approach 1:

The patent removes the motorized actuator (electrical or hydraulic motor) from the clamping system, extracting the complex powered mechanism and replacing it with a simple spring-loaded clamp that uses mechanical energy storage instead of continuous power delivery

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The spring is pre-loaded before deployment to store elastic potential energy, which is then released to provide the clamping force when needed, eliminating the need for powered actuators during operation

Inventive Principle:

Principle #10Preliminary action

2Force

If motorized actuators are used to maintain clamping force, then adequate clamping is achieved, but continuous power is required

Engineering Contradiction:

Improveclamping forceVSAvoidpower consumption

Core Design Contradiction:

ForceVSUse of energy by moving object

Solution Approach 1:

The system uses periodic rather than continuous energy input - the spring is loaded once before deployment and then provides intermittent clamping force throughout the measurement period without requiring continuous power

Inventive Principle:

Principle #19Periodic action

Solution Approach 2:

Energy is stored in advance in the spring mechanism before the clamping operation begins, eliminating the need for continuous power supply during the actual clamping and measurement process

Inventive Principle:

Principle #10Preliminary action

3Use of energy by moving object

If passive clamping systems (high strength magnets or bow spring clamps) are used, then continuous power is not required, but the clamping force is insufficient

Engineering Contradiction:

Improvepower consumptionVSAvoidclamping force

Core Design Contradiction:

Use of energy by moving objectVSForce

Solution Approach 1:

The spring is pre-loaded to a specific compression level that stores sufficient elastic potential energy to generate the required clamping force (greater than ten times the sensor weight) when released, optimizing the balance between passive operation and adequate force

Inventive Principle:

Principle #35Parameter changes

4Use of energy by moving object

If passive clamping systems are always engaged, then no power is needed, but drag force increases due to friction

Engineering Contradiction:

Improvepower consumptionVSAvoiddrag force

Core Design Contradiction:

Use of energy by moving objectVSObject-generated harmful factors

Solution Approach 1:

The clamp arm is designed to be dynamically deployable - it can be extended to engage the borehole wall when clamping is needed and retracted when not needed, allowing the system to transition between engaged and disengaged states rather than remaining constantly engaged

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The clamp arm is pre-positioned in a retracted state during deployment and only extended to the engaged position when the sensor needs to be stabilized, minimizing unnecessary frictional contact during lowering and retrieval operations

Inventive Principle:

Principle #10Preliminary action

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 achieves reliable, low-cost, and low-drag sensing with a clamping force greater than ten times the sensor weight, ensuring stable signal coupling and easy retrieval for maintenance, without the need for continuous power, and maintains stability over time with a locking mechanism.

Implementation Method 1

an energy storage element engaged with the body portion. The energy storage element provides energy to move the clamp arm from the retracted position to the extended position

Methodology Applied

Scientific EffectEnergy storage element (spring or shape memory alloy): Spring

Implementation Method 2

using remote actuation and energy storage elements like springs or shape memory alloys to secure sensors within boreholes

Methodology Applied

Scientific EffectShape memory alloy: Shape Memory Alloy

Data Source

PatentUS8701481B2Borehole sensing and clamping systems and methods of using the same

Publication Date: 2014.04.22 AVALON SCI

AI summary

A sensing system configured for use in a borehole. The sensing system includes a body portion and a clamp arm engaged with the body portion. The clamp arm is configured to move between a retracted position and an extended position. The sensing system also includes an energy storage element engaged with the body portion. The energy storage element provides energy to move the clamp arm from the retracted position to the extended position. A method of using the sensing system is also provided.