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Keywords: thermal stress
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Proceedings Papers

Paper presented at the 55th U.S. Rock Mechanics/Geomechanics Symposium, June 18–25, 2021
Paper Number: ARMA-2021-1281
.... That is, the efficiency of rock breaking will be improved. The findings indicate that thermal stress plays an important role in assisting the process of HDR drilling. 1. Introduction Hot dry rock is an important renewable energy resource within the overall energy mix (Feng et al., 2012; Huang et al., 2018; Lund...
Proceedings Papers

Paper presented at the 53rd U.S. Rock Mechanics/Geomechanics Symposium, June 23–26, 2019
Paper Number: ARMA-2019-2188
... fracturing in fractured rock. The thermal stress, rock deformation and cracking induced by temperature change are modeled by FEMM. The finite element meshfree method (FEMM) is presented to model mechanical deformation and discontinuities. With the concept of partition of unity, the accuracy of global...
Proceedings Papers

Paper presented at the 53rd U.S. Rock Mechanics/Geomechanics Symposium, June 23–26, 2019
Paper Number: ARMA-2019-1710
... freeze-thaw cycle specimen hydraulic fracturing ln 2 stress level Upstream Oil & Gas thermal stress MPa breakdown pressure nitrogen coal sample experimental investigation actuator 1. INTRODUCTION Coalbed methane (CBM) is well recognized as one of valuable energy resources (Moore 2012...
Proceedings Papers

Paper presented at the 53rd U.S. Rock Mechanics/Geomechanics Symposium, June 23–26, 2019
Paper Number: ARMA-2019-1725
... coefficient plastic zone thermal conductivity temperature distribution coefficient heat transfer drilling operation temperature difference plastic thermal stress mechanical property drilling fluid temperature 1. INTRODUCTION The polar region is rich in oil and gas resources and the proven oil...
Proceedings Papers

Paper presented at the 52nd U.S. Rock Mechanics/Geomechanics Symposium, June 17–20, 2018
Paper Number: ARMA-2018-1436
... of rock sheets forming a granitic exfoliation dome in California, USA. Through a three-year field effort, we found that subcritical fracture occurred due to diurnal and seasonal cumulative thermal stresses. However, our analyses also indicate that subsequent critical fracture could only have been reached...
Proceedings Papers

Paper presented at the 52nd U.S. Rock Mechanics/Geomechanics Symposium, June 17–20, 2018
Paper Number: ARMA-2018-1437
... that are predicated on rock and mineral properties themselves (i.e. thermal stresses will be predicated on the coefficient of thermal expansion of individual minerals comprising the rock). 4. METHODS 4.1. Sampling Strategy Eppes et al., (in review) and Hancock et al., (in review) collected subcritical cracking data...
Proceedings Papers

Paper presented at the 51st U.S. Rock Mechanics/Geomechanics Symposium, June 25–28, 2017
Paper Number: ARMA-2017-0747
... of transient cooling on the thermal stresses in a cooled zone. Then, we increase the number of cracks in the domain and consider interactions from multiple fractures and their propagation direction is investigated. In order to increase the accuracy of stress intensity factor calculation, the special crack tip...
Proceedings Papers

Paper presented at the 51st U.S. Rock Mechanics/Geomechanics Symposium, June 25–28, 2017
Paper Number: ARMA-2017-0559
... geothermal reservoir Upstream Oil & Gas Simulation thermal stress natural fracture agust gudmundsson fluid pressure fracture principal thermal stress interaction HF crack propagation rd principal stress equation Geothermal System natural fault 1. INTRODUCTION Geothermal energy resources...
Proceedings Papers

Paper presented at the 51st U.S. Rock Mechanics/Geomechanics Symposium, June 25–28, 2017
Paper Number: ARMA-2017-0474
... the conductivity and permeability. For smaller pressures, the reduction of the effective stress might cause hydro-shearing of existing fractures. Moreover, injecting fluid colder than the in situ temperature will generate thermal stresses, with similar effect on the fractures. To tackle all those aspects, we...
Proceedings Papers

Paper presented at the 51st U.S. Rock Mechanics/Geomechanics Symposium, June 25–28, 2017
Paper Number: ARMA-2017-0585
... greater in magnitude than that of water-based fracturing, which shows that the energy release rate maybe sufficient for fracture branching. The expansion and thermal stresses induced by CO 2 phase change, when the fracture instability occurs, further extend the fractures or even create multi-fractures...
Proceedings Papers

Paper presented at the 50th U.S. Rock Mechanics/Geomechanics Symposium, June 26–29, 2016
Paper Number: ARMA-2016-668
... Abstract: Injection of supercritical CO 2 into storage reservoirs causes thermally induced expansion and contraction inside the wellbore, potentially leading to the creation of leakage pathways. Determining a safe operating range for temperature and assessment of thermal stresses during CO...
Proceedings Papers

Paper presented at the 50th U.S. Rock Mechanics/Geomechanics Symposium, June 26–29, 2016
Paper Number: ARMA-2016-300
... indicates that thermal stresses can greatly affect initiation and propagation of fractures and assist the communication between injection pressure and pore pressure in the rock formation; thermal fracturing can be considered as an effective method to connect fracture network, enhance weak zones and create...
Proceedings Papers

Paper presented at the 49th U.S. Rock Mechanics/Geomechanics Symposium, June 28–July 1, 2015
Paper Number: ARMA-2015-421
... to tensile stresses from cooling the rock by -100 °C was greater than at higher stress regimes. This was due to the greater stress differential between the mud pressure and the stress field in the higher stress regime. The higher mud pressure counteracts the thermal stresses and thus less fractures develop...
Proceedings Papers

Paper presented at the 49th U.S. Rock Mechanics/Geomechanics Symposium, June 28–July 1, 2015
Paper Number: ARMA-2015-214
... that elasticity modulus (Young’s modulus) and temperatures play important roles in thermal stress distribution. The results show that at 4500°C with 6MPa compressive loading elasticity modulus is the best situation for wellbore instability. By contrast, at 1500°C with a loading of 38MPa elasticity modulus...
Proceedings Papers

Paper presented at the 48th U.S. Rock Mechanics/Geomechanics Symposium, June 1–4, 2014
Paper Number: ARMA-2014-6995
... in porous media aperture reservoir pressure Fluid Dynamics fracture growth curve thermal stress hydraulic fracturing fluid pressure crack growth curve equation fluid flow penetration fracture growth initial fracture length crack growth dry fracture growth curve propagation Upstream Oil...
Proceedings Papers

Paper presented at the 48th U.S. Rock Mechanics/Geomechanics Symposium, June 1–4, 2014
Paper Number: ARMA-2014-7109
... column, the adjacent rock, and the casing/cement and cement/rock interfaces. Production of relatively hot reservoir fluids, injection of hot fluids (e.g. steam) and relatively cold drilling and stimulation fluids create thermal stresses in the casing/cement/rock system [1, 2]. If sufficiently high...
Proceedings Papers

Paper presented at the 48th U.S. Rock Mechanics/Geomechanics Symposium, June 1–4, 2014
Paper Number: ARMA-2014-7077
... Abstract The laboratory testing described here can be seen as the first step in investigating potential thermal effects leading to the creation of a leakage pathway at or in the vicinity of a CO 2 injection well. The occurrence of thermal stresses in metal casing, cement and formation can...
Proceedings Papers

Paper presented at the 48th U.S. Rock Mechanics/Geomechanics Symposium, June 1–4, 2014
Paper Number: ARMA-2014-7722
... depth. Upstream Oil & Gas flow in porous media fluid injection stimulation shear failure seismic event reservoir geomechanics Fluid Dynamics bimodal depth distribution open zone Reservoir Characterization thermal stress seismicity fracture shallow reservoir geothermal reservoir...
Proceedings Papers

Paper presented at the 47th U.S. Rock Mechanics/Geomechanics Symposium, June 23–26, 2013
Paper Number: ARMA-2013-306
... Abstract: Drilling of high pressure/high temperature (HPHT) wells and injection of liquefied (cold) CO 2 into underground formations produce thermal stresses in the surrounding rocks. The induced tensile stresses may exceed the tensile strength of the formation or other materials (casing...
Proceedings Papers

Paper presented at the 46th U.S. Rock Mechanics/Geomechanics Symposium, June 24–27, 2012
Paper Number: ARMA-2012-425
... this process using a numerical model that is based on the complex hypersingular integral equation. The model is used to study the conditions necessary for the growth of radial cracks. The influences of the internal pressure, thermal stress, and the in-situ stress anisotropy on the cracks’ lengths...

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