Intelligent Seismic-Acoustic System for Identifying the Area of the Focus of an Expected Earthquake

This paper presents an acoustic position measurement system used for precise three-dimensional flowline profile measurement. The system measures several points along the flowline using the long-baseline measurement technique and augments this measurement with depth telemetry repeaters to maintain elevation accuracy throughout the changing installation geometry. The paper discusses both the measurement system and the performance enhancement features. The paper concludes with a discussion of the hardware configuration and the accuracy that can be expected when the technique is extended into deeper operating areas.

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Underwater acoustic system analysis

Applied Ocean Research ◽

10.1016/0141-1187(84)90055-5 ◽

1984 ◽

Vol 6 (2) ◽

pp. 124

Keyword(s):

System Analysis ◽

Acoustic System ◽

Underwater Acoustic

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Real-time completion monitoring with acoustic waves

Geophysics ◽

10.1190/1.2818117 ◽

2008 ◽

Vol 73 (1) ◽

pp. E15-E33 ◽

Cited By ~ 16

Author(s):

Andrey Bakulin ◽

Alexander Sidorov ◽

Boris Kashtan ◽

Mikko Jaaskelainen

Keyword(s):

Real Time ◽

Acoustic Waves ◽

Acoustic System ◽

Acoustic Signatures ◽

New Findings ◽

Sand Control ◽

Surveillance Method ◽

4D Seismic ◽

Permeability Impairment ◽

Downhole Sensors

Deepwater production is challenged by well underperformance issues that are hard to diagnose early on and expensive to deal with later. Problems are amplified by reliance on a few complex wells with sophisticated sand-control media. New downhole data are required for better understanding and prevention of production impairment. We introduce real-time completion monitoring (RTCM), a new nonintrusive surveillance method that uses acoustic signals sent via the fluid column to identify permeability impairment in sand-screened completions. The signals are carried by tube waves that move borehole fluid back and forth radially across the completion layers. Such tube waves are capable of instant testing of the presence or absence of fluid communication across the completion and are sensitive to changes occurring in sand screens, gravel sand, perforations, and possibly in the reservoir. The part of the completion that has different impairment from its neighbors will carry tube waves with modified signatures (velocity, attenuation) and will produce a reflection from the boundary where impairment changes. We conduct a laboratory experiment with a model of a completed horizontal borehole and focus on effects of sand-screen permeability on transmitted and reflected acoustic signatures. These new findings form the basis of an RTCM method that can be thought of as “miniaturized” 4D seismic and as a “permanent log” in an individual wellbore. We present experiments with a fiber-optic acoustic system that suggest a nonintrusive way to install downhole sensors on the pipe in realistic completions and thus implement real-time surveillance with RTCM.

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Passive underwater range measurement acoustic system

The Journal of the Acoustical Society of America ◽

10.1121/1.391722 ◽

1985 ◽

Vol 77 (6) ◽

pp. 2204-2204

Author(s):

Francois Orieux ◽

Jean Berthéas

Keyword(s):

Acoustic System ◽

Range Measurement

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Robust optimisation of vibro-acoustic system based on an elliptical basis function neural network

Applied Acoustics ◽

10.1016/j.apacoust.2018.09.013 ◽

2019 ◽

Vol 145 ◽

pp. 41-51

Author(s):

Wanglin Chen ◽

Zhengqi Gu ◽

Xiaokui Ma ◽

Sha Zhang ◽

Zhengtong Han ◽

...

Keyword(s):

Neural Network ◽

Basis Function ◽

Acoustic System ◽

Robust Optimisation

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Simultaneous lithospheric-atmospheric signals of acoustic emission at “Karymshina” site in Kamchatka

EPJ Web of Conferences ◽

10.1051/epjconf/202125402013 ◽

2021 ◽

Vol 254 ◽

pp. 02013

Author(s):

Igor Larionov ◽

Yuriy Marapulets ◽

Mikhail Mishchenko

Keyword(s):

Acoustic Emission ◽

Active Region ◽

Ground Surface ◽

Wide Band ◽

Kamchatka Peninsula ◽

Acoustic Signals ◽

Rock Deformation ◽

Acoustic System ◽

Near Surface ◽

Atmosphere Interaction

We present the results of complex lithospheric-atmospheric investigations of acoustic emission in a seismically active region (Kamchatka peninsula). A laser strainmeter-interferometer, a geophone, a wide-band acoustic system and a microbarometer, installed at Karymshina site (IKIR FEB RAS), are used in the monitoring. Rock deformation, acoustic emission in the near-surface rocks and in the atmosphere by the ground surface are under the consideration. Moreover, we suggest a method to detect acoustic signals recorded simultaneously in the near-surface rocks and in the atmosphere by the ground surface. The method consists in filtration of acoustic signals from the sensors at different frequency sub-ranges from fractions to the first hundreds of hertz followed by detection and accumulation of on 1-second interval. We analyze the data from September 2016 to December 2020. Examples of records of simultaneous acoustic signals in rocks and in the atmosphere are illustrated. The investigation is topical for the construction of a model of lithosphere-atmosphere interaction in a seismically active region.

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