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Keywords: fiber
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Proceedings Papers

Paper presented at the 55th U.S. Rock Mechanics/Geomechanics Symposium, June 18–25, 2021
Paper Number: ARMA-2021-1656
... ABSTRACT: Low-frequency Distributed Acoustic Sensing (DAS) is a cross-well measurement technique for interpreting fracture geometry during the fracturing process. It measures strain and strain rate of the fiber in the observation well that geomechanical responses of the rock can be obtained...
Proceedings Papers

Paper presented at the 55th U.S. Rock Mechanics/Geomechanics Symposium, June 18–25, 2021
Paper Number: ARMA-2021-1229
... ABSTRACT: We present a novel approach to slope stability monitoring using a Distributed Rayleigh Sensing system on conventional, commercial fiber optic cables. Commercially this technology is generally deployed for characterising short time period strains or Distributed Acoustic Sensing (DAS...
Proceedings Papers

Paper presented at the 55th U.S. Rock Mechanics/Geomechanics Symposium, June 18–25, 2021
Paper Number: ARMA-2021-1299
... ABSTRACT: The "Glass from Tailings" team at the Colorado School of Mines is investigating the use of earth resources (including waste rock and mill tailings) to produce a silicate melt that can be pulled into fibers which in turn can be fabricated into fabric, building materials, rebar...
Proceedings Papers

Paper presented at the 55th U.S. Rock Mechanics/Geomechanics Symposium, June 18–25, 2021
Paper Number: ARMA-2021-1920
... ABSTRACT: In-well fiber optics Distributed Acoustic Sensing (DAS) data are widely used to estimate cluster fluid contribution and monitor cross-stage fluid communication. One common way of visualizing fluid distribution is through waterfall plots of energy attribute derived from the DAS data...
Proceedings Papers

Paper presented at the 53rd U.S. Rock Mechanics/Geomechanics Symposium, June 23–26, 2019
Paper Number: ARMA-2019-0273
... ABSTRACT: We conducted proppant transport experiments using water, slick water and linear gel with and without degradable fiber. Three types of proppant transport slot equipment were used for the experiments and the results were compared. If fiber was used for transporting proppant...
Proceedings Papers

Paper presented at the 53rd U.S. Rock Mechanics/Geomechanics Symposium, June 23–26, 2019
Paper Number: ARMA-2019-1651
... ABSTRACT: This study evaluates the use of the synthetic polypropylene fibers (SPF) to mitigate Class G cement strength retrogression under high-temperature conditions. Cement samples with different SPF concentrations were prepared, half of the samples were cured at 38°C for 28 days...
Proceedings Papers

Paper presented at the 53rd U.S. Rock Mechanics/Geomechanics Symposium, June 23–26, 2019
Paper Number: ARMA-2019-2105
... was used to investigate the plugging mechanism of TPM. Results showed that the plugging processes include bridging and sealing. The bigger particles would firstly bridge at the narrow section of the fracture, and then the smaller fibers would seal the pore-spaces of the bridging sections. The difference...
Proceedings Papers

Paper presented at the 52nd U.S. Rock Mechanics/Geomechanics Symposium, June 17–20, 2018
Paper Number: ARMA-2018-1127
... ABSTRACT: A new optic fiber sensor for detection of the change in the difference between refractive indices of plastic optic fibers and that of the surrounding material is proposed. The sensor is made of two plastic optic fibers in the following way: the light emitted from a constant light...
Proceedings Papers

Paper presented at the 52nd U.S. Rock Mechanics/Geomechanics Symposium, June 17–20, 2018
Paper Number: ARMA-2018-566
... options, and tested in a specially constructed test machine to measure the force-displacement response during 10 inches of deflection between the bolts. Afterwards, post-bolted macro-synthetic fiber reinforced shotcrete was tested for comparison with the wire-mesh alternatives. Low (5-lb/yd 3 ) and high...
Proceedings Papers

Paper presented at the 52nd U.S. Rock Mechanics/Geomechanics Symposium, June 17–20, 2018
Paper Number: ARMA-2018-261
... ABSTRACT: Although a new technology of fiber diversion was introduced to hydraulic fracturing for ultra-deep sandstone formation, the operation is not always effective. This paper focused on the fracture reorientation mechanism and the relationship between injection pressure and fracture...
Proceedings Papers

Paper presented at the 52nd U.S. Rock Mechanics/Geomechanics Symposium, June 17–20, 2018
Paper Number: ARMA-2018-831
... ABSTRACT: In the current paper we present results of our first attempt to use Fiber Bragg Grating (FBG) sensors for strain measurements of rock samples under confining pressure. We have demonstrated that the FBG sensors are sensitive to asymmetrical load of rock samples. The main problem...
Proceedings Papers

Paper presented at the 51st U.S. Rock Mechanics/Geomechanics Symposium, June 25–28, 2017
Paper Number: ARMA-2017-0702
.... This article is based on Fiber Bragg Grating (FBG) strain sensor and strain transfer theory. The hydraulic fracturing is controlled by great stress difference and prefabricated fracture direction in the true-triaxial rock test equipment. FBG strain sensors are distributed in the fracture propagation direction...
Proceedings Papers

Paper presented at the 51st U.S. Rock Mechanics/Geomechanics Symposium, June 25–28, 2017
Paper Number: ARMA-2017-0944
... ABSTRACT: Recent research at Montana Tech has focused on demonstrating the effectiveness of the emerging fiber-optic-based distributed strain and temperature (DST) and distributed acoustic sensing (DAS) technologies in an underground environment, facilitating their adoption by the mining...
Proceedings Papers

Paper presented at the 51st U.S. Rock Mechanics/Geomechanics Symposium, June 25–28, 2017
Paper Number: ARMA-2017-0233
... ABSTRACT: In recent years, service companies often use a low viscous, fiber-laden fracturing fluid. The added fibers not only assist in the transport of proppant based on mechanical suspension but also prevent proppant settling during fracture closure. Although the chemical composition...
Proceedings Papers

Paper presented at the 51st U.S. Rock Mechanics/Geomechanics Symposium, June 25–28, 2017
Paper Number: ARMA-2017-0313
... ABSTRACT: A new method for identifying type of material ahead of an optic fiber sensor is proposed. The sensor is made of two plastic optic fibers that are aligned side by side and glued together. The tips of these fibers are cut so that outward normal vectors of the cut surfaces are 90...
Proceedings Papers

Paper presented at the 51st U.S. Rock Mechanics/Geomechanics Symposium, June 25–28, 2017
Paper Number: ARMA-2017-0938
... fracture process cable mechanics Upstream Oil & Gas crack length fiber eff fracture 1. INTRODUCTION Cyclic stress is one of the most common mechanisms associated with subcritical crack growth in rock (Atkinson, 1995). For example, the rocks have been subjected to cyclic stresses over a long...
Proceedings Papers

Paper presented at the 50th U.S. Rock Mechanics/Geomechanics Symposium, June 26–29, 2016
Paper Number: ARMA-2016-413
... Abstract: We applied a normal stress (s n = 0 - 12.8 psi) to a transparent deformable fracture to investigate the behavior of sand-fiber mixtures. Using light transmission techniques, we quantified the sand volume fraction ? s throughout the experiment. In the absence of an applied...
Proceedings Papers

Paper presented at the 49th U.S. Rock Mechanics/Geomechanics Symposium, June 28–July 1, 2015
Paper Number: ARMA-2015-784
... Abstract Two plastic optical fibers, both having diameter of 1mm, are used to read local disturbance or deformation at a point in granular material, such as sand, soil, or broken rocks. As light is sent into the 1st fiber and reaches its end, it leaves the fiber and hits surfaces of nearby...
Proceedings Papers

Paper presented at the 48th U.S. Rock Mechanics/Geomechanics Symposium, June 1–4, 2014
Paper Number: ARMA-2014-7723
... Abstract A new method is proposed for reading local deformation of granular material by using reflection of light. In this method, two plastic optical fibers, both having diameter of 1mm, are used to read local disturbance or deformation at a point in granular material, such as sand, soil...
Proceedings Papers

Paper presented at the 47th U.S. Rock Mechanics/Geomechanics Symposium, June 23–26, 2013
Paper Number: ARMA-2013-137
.... Upstream Oil & Gas diversion tunnel Reservoir Characterization information strength steel fiber Joule energy absorption construction materials correlation shotcrete compressive strength fiber admixture day age Mexico Performance Parameter las cruces dosage square panel tunnel round...

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