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Assessing Blood pressure using a doppler ultrasound

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To obtain accurate blood pressure measurements in clinical settings, especially when traditional methods are insufficient, healthcare professionals utilize the Doppler ultrasound technique. This method uses high-frequency sound waves to detect blood flow within the arteries, which is crucial for patients with conditions that complicate circulatory system assessment.
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Related Experiment Video

Updated: Oct 17, 2025

Experimental Investigation of Secondary Flow Structures Downstream of a Model Type IV Stent Failure in a 180° Curved Artery Test Section

Experimental Investigation of Secondary Flow Structures Downstream of a Model Type IV Stent Failure in a 180° Curved Artery Test Section

Published on: July 19, 2016

Research on an Lost Circulation Zone Location Method Based on Transient Pressure Wave.

Ruida Zhang¹, Zhongxi Zhu¹, Chaofei Wang²

¹National Engineering Laboratory of Petroleum Drilling Technology, Leak Resistance & Sealing Technology Research Department, Yangtze University, Wuhan 430100, China.

|October 11, 2021

Summary

Accurately locating lost circulation zones is crucial for effective well plugging. This study proposes a novel method using transient pressure waves and advanced signal processing to pinpoint these zones with high accuracy.

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Published on: September 1, 2014

Related Experiment Videos

Last Updated: Oct 17, 2025

Experimental Investigation of Secondary Flow Structures Downstream of a Model Type IV Stent Failure in a 180° Curved Artery Test Section

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Published on: July 19, 2016

Using Laser Doppler Imaging and Monitoring to Analyze Spinal Cord Microcirculation in Rat

Using Laser Doppler Imaging and Monitoring to Analyze Spinal Cord Microcirculation in Rat

Published on: May 30, 2018

Quantification of Global Diastolic Function by Kinematic Modeling-based Analysis of Transmitral Flow via the Parametrized Diastolic Filling Formalism

Quantification of Global Diastolic Function by Kinematic Modeling-based Analysis of Transmitral Flow via the Parametrized Diastolic Filling Formalism

Published on: September 1, 2014

Area of Science:

Petroleum Engineering
Geophysics
Signal Processing

Background:

Lost circulation poses significant challenges in drilling operations, hindering subsequent plugging efforts.
Existing methods for identifying lost circulation zones are often indirect or lack precision.

Purpose of the Study:

To develop and validate a method for accurately locating lost circulation zones using transient pressure wave signals.
To improve the signal-to-noise ratio of pressure wave data for reliable analysis.

Main Methods:

Generation of transient pressure waves by applying back pressure at the wellhead.
Analysis of wave propagation in the annulus and identification of signal changes at the choke manifold.
Application of variational modal decomposition (VMD) for signal denoising.
Utilizing wavelet modulus maxima for feature extraction and time-domain analysis to locate the loss zone.

Main Results:

Experimental verification confirms that lost zones alter pressure wave trends.
The VMD-wavelet modulus maxima algorithm effectively removes noise and identifies pressure change points.
The proposed method achieved an experimental recognition error range of 0.10-9.22%.

Conclusions:

Transient pressure wave analysis, combined with VMD and wavelet methods, provides an effective approach for locating lost circulation zones.
The developed technique offers a reliable and accurate solution for real-time identification of thief zones in drilling operations.