Top of Cement Detection Using Reflected Energy Pulses

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Solution Overview

Problem

Existing methods for determining the top of cement (TOC) in wellbore annuli require invasive tools and delay operations, adding expense and time to the cementing process.

Innovation Solution

A non-invasive method using reflected energy pulses, such as acoustic, electromagnetic, or light signals, is employed during the wait-on-cement period to detect TOC by analyzing the temperature-induced changes in acoustic velocity and other properties of the cement displacement fluid in the casing.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If invasive tools are used to determine top of cement, then measurement precision is improved, but device complexity and loss of time increase

Engineering Contradiction:

Improvetop of cement detection accuracyVSAvoidoperational delay

Core Design Contradiction:

Measurement precisionVSLoss of time

Solution Approach 1:

The system performs TOC detection during the wait-on-cement period by analyzing temperature profiles before final cement set is complete. Temperature sensors continuously monitor the annulus, and the system identifies TOC by detecting the thermal signature of setting cement, allowing determination before invasive tools would be needed

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent replaces invasive mechanical tools with a non-invasive thermal detection system. Instead of physically probing the annulus to locate TOC, the system uses temperature sensors to detect thermal patterns generated by exothermic cement hydration, eliminating the need for tool intervention

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

2Measurement precision

If invasive tools are deployed to detect top of cement, then measurement precision is improved, but device complexity and cost increase

Engineering Contradiction:

Improvetop of cement detection accuracyVSAvoidtool intervention requirement

Core Design Contradiction:

Measurement precisionVSDevice complexity

Solution Approach 1:

The system substitutes complex mechanical detection tools with a thermal monitoring system using temperature sensors and data processing algorithms. The sensors record temperature profiles in the annulus, and software analyzes these profiles to identify TOC based on thermal characteristics of setting cement

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The cement itself serves as the detection target by generating its own thermal signature during setting. The exothermic hydration reaction creates a detectable temperature pattern that automatically indicates TOC location, eliminating the need for external active probing tools

Inventive Principle:

Principle #25Self-service

3Reliability

If traditional methods are used to determine top of cement, then reliability is improved through direct measurement, but loss of time and productivity decrease

Engineering Contradiction:

Improvemeasurement accuracyVSAvoidoperational efficiency

Core Design Contradiction:

ReliabilityVSProductivity

Solution Approach 1:

Temperature monitoring continues uninterrupted during the entire wait-on-cement period, continuously collecting thermal data without pausing operations. This continuous monitoring allows TOC determination to be integrated into the existing cementing workflow rather than requiring separate measurement steps

Inventive Principle:

Principle #20Continuity of useful action

Solution Approach 2:

The system provides real-time feedback by analyzing temperature profiles as they develop and identifying TOC when thermal patterns indicate cement set completion. This feedback mechanism allows operators to make informed decisions about subsequent operations based on actual TOC location

Inventive Principle:

Principle #23Feedback

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

Enables rapid and cost-effective identification of TOC without requiring tool intervention, utilizing the wait-on-cement period for data collection and reducing operational delays.

Implementation Method 1

input energy pulses are transmitted through a cement displacement fluid in a casing... reflected energy pulses that traveled through the cement displacement fluid and the casing

Methodology Applied

Scientific EffectReflection: Reflection

Implementation Method 2

temperature-induced changes in acoustic velocity and other properties of the cement displacement fluid in the casing

Methodology Applied

Scientific EffectThermal expansion: Thermal Expansion

Data Source

PatentUS12541024B1Remote detection of top of cement using energy pulses

Publication Date: 2026.02.03 HALLIBURTON ENERGY SERVICES INC

AI summary

A variety of methods and systems for detecting top of cement in well operations are disclosed, including, in one embodiment, a method for detecting top of cement, including: emitting input energy signals into a cement displacement fluid positioned in a casing, wherein the input energy signals travel in the cement displacement fluid down the casing and are reflected in the casing to form reflected energy signals that return to a surface, and wherein the input energy signals are emitted while a cement composition is setting to harden and form compressive strength in a borehole annulus; measuring one or more properties of the reflected energy signals; and determining the top of cement of the cement composition in the borehole annulus based on at least the one or more properties and temperature data of the borehole.