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Keywords: stability
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Proceedings Papers

Paper presented at the 53rd U.S. Rock Mechanics/Geomechanics Symposium, June 23–26, 2019
Paper Number: ARMA-2019-0095
... ABSTRACT: Weathering makes the hard and compact rock loosely damaged, resulting in great reduction of rock's strength and stability, which has a negative impact on the engineering construction. Most of the unfavorable geological phenomena such as landslides, collapses, shatters and mudslides...
Proceedings Papers

Paper presented at the 53rd U.S. Rock Mechanics/Geomechanics Symposium, June 23–26, 2019
Paper Number: ARMA-2019-0011
... failure under reservoir depletion since its mechanical strength becomes weaker. This paper investigates the effects of wormhole geometry and rock strength weakening on wormhole stability by coupled hydro-chemo-mechanical simulation. The acidizing process is firstly simulated using in-house acidizing...
Proceedings Papers

Paper presented at the 53rd U.S. Rock Mechanics/Geomechanics Symposium, June 23–26, 2019
Paper Number: ARMA-2019-0072
... ABSTRACT: The deformation stability and control theory based on viscoelastic, viscoplastic and viscodamage models is developed to simulate time-dependent deformation and quantitatively evaluate the long-term stability of gas storage caverns in salt rock. A quantitative criterion for the long...
Proceedings Papers

Paper presented at the 53rd U.S. Rock Mechanics/Geomechanics Symposium, June 23–26, 2019
Paper Number: ARMA-2019-0013
... completion complex reservoir Longwall Mining US government inclinometer displacement shale gas well Upstream Oil & Gas gas well test site longwall-induced subsurface deformation permeability change permeability integrity mining panel mining abutment pillar stability shallow cover...
Proceedings Papers

Paper presented at the 53rd U.S. Rock Mechanics/Geomechanics Symposium, June 23–26, 2019
Paper Number: ARMA-2019-0126
... ABSTRACT: Special rock mechanical characteristics of natural gas hydrate (NGH) sediments lead to the inapplicability of traditional well stability models. In this paper, a new model to calculate the collapse pressure and fracture pressure of a borehole in NGH formation is studied based on the...
Proceedings Papers

Paper presented at the 53rd U.S. Rock Mechanics/Geomechanics Symposium, June 23–26, 2019
Paper Number: ARMA-2019-0237
... track. The optimization results can effectively guide the on-site construction and enhance and maintain the coalbed gas production. complex reservoir orientation multi-branch t-shaped well drilling encounter rate coal seam gas branch length Upstream Oil & Gas optimization stability...
Proceedings Papers

Paper presented at the 53rd U.S. Rock Mechanics/Geomechanics Symposium, June 23–26, 2019
Paper Number: ARMA-2019-0134
... ABSTRACT: As new development moves into the vicinity of large granite boulders, new factors including vibrational loads caused by construction equipment or seismic shaking, loss of downslope support, and human activity begin to play a role in the stability of precariously balanced boulders...
Proceedings Papers

Paper presented at the 53rd U.S. Rock Mechanics/Geomechanics Symposium, June 23–26, 2019
Paper Number: ARMA-2019-0276
... ABSTRACT: With the shale gas boom over the past decade, many shale gas wells have been drilled through the Pittsburgh coal seam to the Marcellus shale formation. The wells located in longwall barrier pillars are influenced by longwall mining, and their stability has been a safety concern for...
Proceedings Papers

Paper presented at the 53rd U.S. Rock Mechanics/Geomechanics Symposium, June 23–26, 2019
Paper Number: ARMA-2019-0249
... diverge. Assumptions such as uniform fracture fluid pressure or homogeneous fracture conductivity leads to inaccurate solutions of proppant transport in the fractures. In this paper, we present a novel linearized predictor method to increase the speed and stability of solving the coupled fracture fluid...
Proceedings Papers

Paper presented at the 53rd U.S. Rock Mechanics/Geomechanics Symposium, June 23–26, 2019
Paper Number: ARMA-2019-0275
... valley. The rock mass properties and environmental conditions of the area were gathered from literature to conduct a preliminary stability assessment of the fractured cliff above the 18 th Dynasty tomb KV42 constructed for Hatshepsut-Meryet-Ra, the wife of Thutmose III, reused by a mayor of Thebes...
Proceedings Papers

Paper presented at the 53rd U.S. Rock Mechanics/Geomechanics Symposium, June 23–26, 2019
Paper Number: ARMA-2019-0370
... ABSTRACT: Abandoned Cavern 4 on the Bayou Choctaw Dome sits within the U.S. Strategic Petroleum Reserve property and requires monitoring and periodic assessments of stability. The cavern was originally drilled for brine production in 1935 and was abandoned in 1954 following the collapse of...
Proceedings Papers

Paper presented at the 53rd U.S. Rock Mechanics/Geomechanics Symposium, June 23–26, 2019
Paper Number: ARMA-2019-0387
... terrestrial analogs (10-30 m wide). In this study, we use the lava flow characteristics and limit equilibrium analysis of the collapsed skylights to investigate the cross-section size of lunar lava tubes. The structural stability of the tubes with different geometries and material properties is analyzed using...
Proceedings Papers

Paper presented at the 53rd U.S. Rock Mechanics/Geomechanics Symposium, June 23–26, 2019
Paper Number: ARMA-2019-1607
... highly fractured roadway support, the coupling reinforcing technology of prestressed hollow rock bolt-TECCO wire mesh-grouting concrete is proposed. In this supporting system, the prestressed rock bolt perform as the deep roots of plants into shallow rock to reinforce deep stability of the bedrock, the...
Proceedings Papers

Paper presented at the 53rd U.S. Rock Mechanics/Geomechanics Symposium, June 23–26, 2019
Paper Number: ARMA-2019-1672
... the stability of gate road entry in a longwall mine. The realistic field database is created using Extreme Value stochastic model. Two scaler parameters from both horizontal and vertical directions are added to control the spatial correlation. A few cutting sequences are considered to observe the...
Proceedings Papers

Paper presented at the 53rd U.S. Rock Mechanics/Geomechanics Symposium, June 23–26, 2019
Paper Number: ARMA-2019-1725
...-solid coupling numerical model of wellbore stability, which considering phase transformation, is established in this paper. The influence of drilling fluid temperature on the plastic yielding area around the wellbore during the drilling process in the frozen soil was analyzed. The results show that the...
Proceedings Papers

Paper presented at the 53rd U.S. Rock Mechanics/Geomechanics Symposium, June 23–26, 2019
Paper Number: ARMA-2019-1862
... ABSTRACT: A fluid-driven fracture propagation model was presented to investigate the mechanical stability of natural fracture (NF) when hydraulic fracture (HF) approaching. The induced stresses generated by the approaching HF were semi-analytically calculated based on the complex variable...
Proceedings Papers

Paper presented at the 53rd U.S. Rock Mechanics/Geomechanics Symposium, June 23–26, 2019
Paper Number: ARMA-2019-1942
... properties and computational efficiency. Among the class of iterative schemes where hydrodynamics is solved first, we may highlight the fixed strain and stress split. While the fixed strain presents only conditioned stability, the unconditional stable fixed stress split is more efficient, since the source...
Proceedings Papers

Paper presented at the 53rd U.S. Rock Mechanics/Geomechanics Symposium, June 23–26, 2019
Paper Number: ARMA-2019-1928
... ABSTRACT: Submarine slope failures have been considered to have strong spatial relations with the occurrence of gas hydrates. The slope stability analysis used the shear strength reduction technique with a Mohr-Coulomb failure criterion to calculate the factors of safety. When the hydrate was...
Proceedings Papers

Paper presented at the 53rd U.S. Rock Mechanics/Geomechanics Symposium, June 23–26, 2019
Paper Number: ARMA-2019-2075
... ABSTRACT: Maintaining wellbore stability remains a challenging task in the oil/gas well drilling industry, especially for wells drilled through naturally fractured shale formations. Field evidences show that some wellbores that are stable immediately after drilling may collapse after several...
Proceedings Papers

Paper presented at the 53rd U.S. Rock Mechanics/Geomechanics Symposium, June 23–26, 2019
Paper Number: ARMA-2019-1951
... MPa stress ratio radial water jet drill diameter differential stress breakout excavation Reservoir Characterization hole-profile geometry nozzle in-situ stress strength borehole stability tangential stress stress field 1. INTRODUCTION Radial Water-jet Drilling (RJD) uses the power of...

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