Thermal Conductivity Sensor for Real-Time Barite Sag Detection
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Solution Overview
Problem
Conventional roller ovens do not provide real-time measurement of sag in wellbore servicing fluids, which can lead to uneven density and compromised well pressure control during drilling operations, especially in inclined wellbores.
Innovation Solution
An apparatus and method utilizing a thermal conductivity sensor within a roller oven to measure sag in real-time by calculating the settling velocity and density change of the fluid, eliminating the need for manual density measurements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional roller ovens are used to test drilling fluids, then the equipment is simple and easy to operate, but real-time measurement of sag is not provided leading to delayed detection of density changes
Solution Approach 1:
The patent replaces manual density measurement methods with thermal conductivity sensing. A thermal conductivity sensor detects changes in fluid density caused by barite sag in real-time, eliminating the need for complex mechanical measurement systems while providing continuous monitoring capability.
Solution Approach 2:
The patent introduces thermal conductivity as an intermediary parameter to indirectly measure sag. Instead of directly measuring density or barite concentration, the system measures thermal conductivity changes that correlate with sag, providing real-time data without complex direct measurement apparatus.
2Loss of time
If manual density measurements are performed after testing, then equipment complexity is low, but time is lost and real-time monitoring is not achieved
Solution Approach 1:
The patent implements continuous real-time monitoring of thermal conductivity throughout the roller oven test cycle. The sensor continuously measures thermal conductivity as the fluid undergoes sag, providing uninterrupted data without stopping the test or requiring post-test measurements.
Solution Approach 2:
The system automatically records and processes thermal conductivity data throughout the test, eliminating the need for manual intervention. The sensor and data processing system work autonomously to provide real-time sag detection without requiring operators to perform measurements during or after testing.
3Reliability
If thermal conductivity sensing is implemented for real-time sag detection, then measurement capability is improved, but device complexity increases
Solution Approach 1:
The thermal conductivity sensor serves multiple functions: it monitors fluid density changes, detects barite sag in real-time, and provides data for quality assessment. This multi-functionality justifies the added complexity by delivering comprehensive monitoring capabilities from a single sensor system.
Solution Approach 2:
The patent monitors changes in thermal conductivity as the primary indicator of sag. By focusing on this single physical parameter that changes in response to barite settling, the system achieves reliable detection without requiring complex multi-parameter measurement systems.
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 real-time monitoring and calculation of sag, allowing for immediate action to prevent downhole pressure management issues and reducing the risk of barite sag, thereby enhancing safety, efficiency, and economic benefits in drilling operations.
Implementation Method 1
measuring the thermal conductivity of the drilling fluid with the thermal conductivity sensor
Implementation Method 2
Sag (e.g. barite sag), the localized concentration of weighting agent (e.g., barite), is caused by complex fluid dynamics during drilling operations. Most often the phenomenon occurs in inclined wellbores during trips or casing/liner runs when low fluid flow velocity conditions persist downhole.
Implementation Method 3
the localized concentration of weighting agent (e.g., barite), is caused by complex fluid dynamics during drilling operations
Data Source
AI summary
A sag detection apparatus comprises an oven containing a sample cell supported by a cell support structure, a thermal conductivity sensor including a sensor housing, and a roller with a first end supported by a first bearing and fixedly coupled to a first end of the cell support structure and a second end supported by a second bearing and fixedly coupled to a second end of the cell support structure. Temperature sensor wires electrically connect a temperature sensor and first fixed contact via stationary contacts configured to remain fixed during rotation of the roller and rotating contacts configured to rotate with rotation of the roller. Heat source wires electrically connect a heat source and a second fixed contact via stationary contacts configured to remain fixed during rotation of the roller and rotating contacts configured to rotate with rotation of the roller.