Drilling Fluid Sag Detection Using Spectral Induced Polarization

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Solution Overview

Problem

Existing methods for detecting and monitoring sagging in drilling fluids require fluid extraction and are not time-efficient or accurate, often failing to provide real-time data, which limits their effectiveness in preventing sag-related issues during drilling operations.

Innovation Solution

A method utilizing spectral induced polarization (SIP) to inject an alternating current into drilling fluids, measure real-time conductivity and impedance, and calculate densities at different elevations to determine the sag value of weighting materials in situ, allowing for real-time monitoring without fluid extraction.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If conventional methods for detecting sagging in drilling fluids are used, then fluid extraction and laboratory analysis can be performed, but the process is time-consuming and does not provide real-time data

Engineering Contradiction:

Improvesag detection accuracyVSAvoiddetection time

Core Design Contradiction:

Measurement precisionVSLoss of time

Solution Approach 1:

The patent replaces mechanical fluid extraction and laboratory analysis with electromagnetic measurement technology. Electrical probes measure conductivity and impedance of the drilling fluid in situ, eliminating the need for physical sample removal and transport to laboratory facilities, thereby achieving real-time sag detection without time loss.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The patent introduces electrical conductivity and impedance as intermediary parameters to indirectly measure sagging. Instead of directly observing particle settlement, the system uses electrical properties of the fluid as mediators that change in response to sagging, enabling real-time indirect measurement that is both fast and accurate.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Reliability

If conventional sag detection methods are used, then laboratory analysis can be performed on extracted fluid, but real-time monitoring capability is lost

Engineering Contradiction:

Improvesag detection reliabilityVSAvoiddrilling operation efficiency

Core Design Contradiction:

ReliabilityVSProductivity

Solution Approach 1:

The patent implements continuous feedback by constantly monitoring electrical conductivity and impedance of the drilling fluid in real-time. This continuous feedback loop allows immediate detection of sagging trends, enabling operators to adjust drilling parameters or fluid composition proactively, thereby maintaining reliability while enhancing operational efficiency through timely interventions.

Inventive Principle:

Principle #23Feedback

Solution Approach 2:

The drilling fluid itself serves as the measurement medium. The fluid's inherent electrical properties (conductivity and impedance) are utilized directly for sag detection without requiring external sampling or transport infrastructure. The system uses the fluid's own characteristics to monitor its own condition, eliminating productivity losses associated with sample handling.

Inventive Principle:

Principle #25Self-service

3Measurement precision

If fluid extraction is performed for sag analysis, then laboratory testing can be conducted, but the process complexity and operational disruption increase

Engineering Contradiction:

Improvedensity measurement accuracyVSAvoidmeasurement system complexity

Core Design Contradiction:

Measurement precisionVSDevice complexity

Solution Approach 1:

The patent extracts only the necessary measurement function from the complex laboratory analysis process. By measuring electrical conductivity and impedance in situ, the system extracts the essential sag detection capability without requiring extraction of physical fluid samples, thereby simplifying the overall measurement system while maintaining measurement precision.

Inventive Principle:

Principle #2Taking out (Extraction)

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 immediate feedback on drilling fluid conditions, facilitating timely adjustments to prevent sagging and maintain wellbore stability, enhancing drilling efficiency and safety by providing accurate, real-time data on fluid integrity.

Implementation Method 1

measuring real-time data of a real conductivity and an impedance of the drilling fluid based on a spectral induced polarization (SIP) of the drilling fluid during the injecting

Methodology Applied

Scientific EffectSpectral induced polarization: Electromagnetic Induction

Implementation Method 2

injecting an alternating current into the drilling fluid in a frequency range of 0.1-10,000 hertz (Hz)

Methodology Applied

Scientific EffectInduced polarization: Electromagnetic Induction

Data Source

PatentUS20250362283A1Detecting SAG value of weighting material in drilling fluid in borehole

Publication Date: 2025.11.27 KING FAHD UNIVERSITY OF PETROLEUM AND MINERALS

AI summary

A method of detecting a sag value of a weighting material in a drilling fluid in a borehole by injecting an alternating current into the drilling fluid in a frequency range of 0.1-10,000 hertz (Hz) over a time period of 1-6 hours. The method includes measuring real-time data of a real conductivity and an impedance of the drilling fluid based by spectral induced polarization (SIP) of the drilling fluid in the borehole and/or during the injecting. Calculating a first density and a second density of the drilling fluid at a first elevation and a second elevation, respectively, each based on a variation in the real conductivity and the impedance, and calculating the sag value of the weighting material in the drilling fluid based on the first and second densities.