acoustic sensors
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2021 ◽  
Author(s):  
Yunlai Yang ◽  
Wei Li ◽  
Fahd A. Almalki ◽  
Maher I. Almarhoon

Abstract Real time lithological information at the drill bit is required for some important drilling operations, such as geo-steering and casing shoe positioning. This paper presents a novel tool "Petro-phone" for recording and processing drill bit sounds, which are generated by the drill bit cutting the rock, in order to provide real time lithological information for the rock at the drill bit. A prototype and a preliminary professional version of Petro-phone have been developed and field trialed. Petro-phone is a surface tool with its acoustic sensors attached to the top drive of a drill rig at some strategical locations for maximally picking up drill bit sounds. The drill bit sounds generated at the drill bit transmit along drill string and drive shaft to reach to the acoustic sensors. Since all the parts along the drill bit sound transmission pathway are made of steel, the drill bit sounds transmit efficiently from the source (drill bit) to the sensors. Preliminary results from two field trials show that drill bit sound patterns correlate with lithologies. The results also indicate that a parameter "Apparent Power" of drill bit sounds negatively correlates with gamma log. Due to its true real time nature, Petro-phone potentially has some real time applications, such as geo-steering, casing shoes positioning. Recorded drill bit sound can also potentially be used to derive lithological information, such as lithology type.


Author(s):  
Brad Law ◽  
Isobel Kerr ◽  
Leroy Gonsalves ◽  
Traecey Brassil ◽  
Phil Eichinski ◽  
...  

2021 ◽  
Vol 2119 (1) ◽  
pp. 012106
Author(s):  
I V Litvinov ◽  
E U Gorelikov ◽  
S I Shtork

Abstract The experimental study of an isothermal swirl flow with the formation of a precessing vortex core in the radial swirler upon non-confinement and confinement conditions is carried out. Velocity profiles are obtained with varying Re and guide vane angle, changing the swirl number S. Four acoustic sensors and LDA system are used to measure Strouhal number as the function of the integral swirl number in the range from 0.5 <S <0.8. It is shown that the unsteady flow with PVC effect significantly changes upon non-confinement and confinement conditions.


Sensors ◽  
2021 ◽  
Vol 21 (22) ◽  
pp. 7470
Author(s):  
Ester Vidaña-Vila ◽  
Joan Navarro ◽  
Dan Stowell ◽  
Rosa Ma Alsina-Pagès

Many people living in urban environments nowadays are overexposed to noise, which results in adverse effects on their health. Thus, urban sound monitoring has emerged as a powerful tool that might enable public administrations to automatically identify and quantify noise pollution. Therefore, identifying multiple and simultaneous acoustic sources in these environments in a reliable and cost-effective way has emerged as a hot research topic. The purpose of this paper is to propose a two-stage classifier able to identify, in real time, a set of up to 21 urban acoustic events that may occur simultaneously (i.e., multilabel), taking advantage of physical redundancy in acoustic sensors from a wireless acoustic sensors network. The first stage of the proposed system consists of a multilabel deep neural network that makes a classification for each 4-s window. The second stage intelligently aggregates the classification results from the first stage of four neighboring nodes to determine the final classification result. Conducted experiments with real-world data and up to three different computing devices show that the system is able to provide classification results in less than 1 s and that it has good performance when classifying the most common events from the dataset. The results of this research may help civic organisations to obtain actionable noise monitoring information from automatic systems.


Author(s):  
Joeri A. Zwerts ◽  
P. J. Stephenson ◽  
Fiona Maisels ◽  
Marcus Rowcliffe ◽  
Christos Astaras ◽  
...  

2021 ◽  
Vol 150 (5) ◽  
pp. 3569-3580
Author(s):  
Shahideh Kiehbadroudinezhad ◽  
S. Bruce Martin ◽  
Joanna Mills Flemming

Geophysics ◽  
2021 ◽  
pp. 1-17
Author(s):  
Roman Pevzner ◽  
Stanislav Glubokovskikh ◽  
Roman Isaenkov ◽  
Pavel Shashkin ◽  
Konstantin Tertyshnikov ◽  
...  

Instrumenting wells with distributed acoustic sensors (DAS) and illuminating them with passive or active seismic sources allows precise tracking of temporal variations of direct-wave traveltimes and amplitudes, which can be used to monitor variations in formation stiffness and density. This approach has been tested by tracking direct-wave amplitudes and traveltimes as part of a CCS project where a 15 kt supercritical CO2 injection was monitored with continuous offset VSPs using nine permanently mounted surface orbital vibrators (SOVs) acting as seismic sources and several wells instrumented with DAS cables cemented behind the casing. The results show a significant (from 15 to 30%) increase of strain amplitudes within the CO2 injection interval, and travetime shifts of 0.3 to 0.4 ms below this interval, consistent with full-wave 1.5D numerical simulations and theoretical predictions. The results give independent estimates of the CO2 plume thickness and P-wave velocity reduction within it.


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