Geothermal Grout Testing for On-Site Thermal Conductivity Checks

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Solution Overview

Problem

Geothermal heating and cooling systems require grouts with sufficient thermal conductivity for efficient heat transfer between coils and subterranean formations, but existing methods lack efficient on-site assessment techniques, leading to potential delays and inefficiencies in installation.

Innovation Solution

A method and system for assessing the thermal conductivity of grout mixtures on-site by separating the sand component and determining its proportion within a test container, ensuring the grout meets a predetermined conductivity threshold before securing coils in subterranean bores, allowing for real-time adjustments and verification.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If laboratory testing methods are used to assess grout thermal conductivity, then measurement precision is improved, but loss of time increases due to time-consuming transport and testing procedures

Engineering Contradiction:

Improvethermal conductivity measurementVSAvoidtesting time

Core Design Contradiction:

Measurement precisionVSLoss of time

Solution Approach 1:

The patent introduces a test container as an intermediary device that enables field-based thermal conductivity assessment. The container includes a heat source, temperature sensors, and a processor that collectively serve as a portable measurement system, eliminating the need to transport grout samples to laboratories while maintaining measurement capability

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The patent replaces the mechanical/physical transport system (transporting samples to laboratories) with an electronic/portable measurement system. The test container uses electronic components (heat source, sensors, processor) to perform measurements on-site, substituting the traditional laboratory-based mechanical testing approach

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

2Reliability

If traditional laboratory testing procedures are followed, then reliability of thermal conductivity assessment is improved, but productivity decreases due to installation delays

Engineering Contradiction:

Improvethermal conductivity assessmentVSAvoidinstallation speed

Core Design Contradiction:

ReliabilityVSProductivity

Solution Approach 1:

The patent performs thermal conductivity assessment as a preliminary action during the grout mixing process itself, rather than after mixing. By testing the grout mixture before application, the system ensures reliability of thermal properties while enabling immediate feedback that prevents installation delays

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The test container provides real-time feedback on grout thermal conductivity through automated measurements and processor-based analysis. This feedback mechanism allows immediate verification of grout properties, enabling quality assurance without delaying the installation process

Inventive Principle:

Principle #23Feedback

3Loss of time

If on-site testing is implemented, then loss of time is reduced by eliminating laboratory transport, but device complexity increases due to portable testing equipment

Engineering Contradiction:

Improvetesting and transport timeVSAvoidportable testing system

Core Design Contradiction:

Loss of timeVSDevice complexity

Solution Approach 1:

The patent merges multiple functions into the test container: heat source integration, temperature sensing, data processing, and sample containment. By combining these elements into a single portable device, the system reduces the need for separate equipment and simplifies the overall testing setup while enabling on-site measurements

Inventive Principle:

Principle #5Merging (Combining)

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

This approach accelerates the installation of geothermal systems by eliminating the need for time-consuming laboratory tests, ensuring the grout's thermal conductivity meets requirements, reducing installation time and costs, and ensuring uninterrupted work by providing immediate assurance of thermal conductivity.

Implementation Method 1

a heat source to heat the sample from an initial temperature to a final temperature

Methodology Applied

Scientific EffectThermal conduction: Conduction (thermal)

Implementation Method 2

at least two temperature sensors positioned within the test container, each in communication with a different zone of the test container

Methodology Applied

Scientific EffectThermal sensing: Thermocouple

Data Source

PatentUS8851746B2Geothermal heating and/or cooling system grout testing

Publication Date: 2014.10.07 HALLIBURTON ENERGY SERVICES INC

AI summary

A subterranean grouting method including (a) placing a sample of a grout mixture within a test container, (b) separating a sand component from the sample, (c) determining if the grout mixture exhibits a thermal conductivity within a predetermined thermal conductivity range based upon a proportion of the sand component within the sample, and (d) upon determining that the grout mixture exhibits a thermal conductivity with the predetermined thermal conductivity range, securing a conduit within a subterranean bore with the grout mixture, wherein (a), (b), (c), and (d) are carried out proximate each other at a job site.