New Fracture Diagnostic Tool for Unconventionals: High-Resolution Distributed Strain Sensing via Rayleigh Frequency Shift during Production in Hydraulic Fracture Test 2

2021 ◽  
Author(s):  
Gustavo A. Ugueto ◽  
Magdalena Wojtaszek ◽  
Somnath Mondal ◽  
Artur Guzik ◽  
Dana Jurick ◽  
...  
Keyword(s):  
High Resolution ◽  
Frequency Shift ◽  
Hydraulic Fracture ◽  
Diagnostic Tool ◽  
Strain Sensing ◽  
Fracture Test ◽  
Distributed Strain

Ultra-high Resolution Distributed Strain Sensing based on Phase-OTDR

2019 ◽  
Author(s):  
Tao Liu ◽  
Hao Li ◽  
Fan Ai ◽  
Jin Wang ◽  
Cunzheng Fan ◽  
...  
Keyword(s):  
High Resolution ◽  
Strain Sensing ◽  
Distributed Strain

High-resolution distributed strain sensing system for landslide monitoring

Optik ◽  
2018 ◽  
Vol 158 ◽  
pp. 91-96 ◽  
Author(s):  
Zhihua Yu ◽  
Haolong Dai ◽  
Qi Zhang ◽  
Mingyu Zhang ◽  
Li Liu ◽  
...  
Keyword(s):  
High Resolution ◽  
Landslide Monitoring ◽  
Strain Sensing ◽  
Sensing System ◽  
Distributed Strain

CHARACTERIZING ANOMALIES IN DISTRIBUTED STRAIN MEASUREMENTS OF CAST-IN-SITU BORED PILES

2016 ◽  
Vol 78 (8-5) ◽  
Author(s):  
Hisham Mohamad ◽  
Bun Pin Tee ◽  
Koh An Ang ◽  
Mun Fai Chong
Keyword(s):  
Load Transfer ◽  
Load Test ◽  
Strain Sensing ◽  
Strain Profile ◽  
A New Technique ◽  
Optical Time ◽  
Distributed Optical Fiber ◽  
Non Destructive ◽  
Distributed Strain

This paper describes the method of identifying typical defects of bored cast-in-situ piles when instrumenting using Distributed Optical Fiber Strain Sensing (DOFSS). The DOFSS technology is based on Brillouin Optical Time Domain Analyses (BOTDA), which has the advantage of recording continuous strain profile as opposed to the conventional discrete based sensors such as Vibrating Wire strain gauges. In pile instrumentation particularly, obtaining distributed strain profile is important when analysing the load-transfer and shaft friction of a pile, as well as detecting any anomalies in the strain regime. Features such as defective pile shaft necking, discontinuity of concrete, intrusion of foreign matter and improper toe formation due to contamination of concrete at base with soil particles, among others, may cause the pile to fail. In this study, a new technique of detecting such defects is proposed using DOFSS technology which can potentially supplement the existing non-destructive test (NDT) methods. Discussion on the performance of instrumented piles by means of maintained load test are also presented

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