... heat exchange surface area either due to the incremental convection or HF may enhance both energy and fluid productivity in low-permeability formation. Focusing on the thermally induced response near a HY and impact on the fracture propagation and energy transport along these fractures, a computational...

... ABSTRACT: Thermal weakening of rocks is a well-acknowledged phenomenon. However, some experimental results reveal that some rocks are strengthened due to heating in a relatively low temperature regime (25°C to 175°C). In order to investigate the mechanisms of such strengthening phenomenon...

.... Particularly in Enhanced Geothermal Systems (EGS) wells, high temperature and low permeability make the thermally induced failure become more prevalent. Incorporating temperature change, a simple compressive failure model based on Mohr-Coulomb failure criterion for inclined wellbores has been developed...

... to 200°C with a gradual increment of 50°C, without causing any observable thermal shock. The cores were then air cooled and tested using Resonance Frequency meter equipment in accordance with the ASTM C-215 standard procedure at an applied loading frequency of 7 to 16 KHz. In this study resonance...

... ABSTRACT: Thermally induced stresses are calculated near a wellbore and a thermal cracking zone is indentified as an major volume for heat exchange in Hot Dry Rock (HDR) through which a much larger contact volume created near a wellbore or a hydraulic fracture in an Enhanced Geothermal System...

... Abstract: Sanding onset and sand production rate in non-isothermal conditions are of interest both for post-Cold Heavy Oil Production with Sand (CHOPS) and thermally related (Enhanced Oil Recovery) EOR processes for sand control and optimized production purposes. Critical drawdowns...

...). However, both modeling results and experiment observations indicate that the extreme temperature differential has the capability to cause fracturing. Thermomechanical modeling was used to identify maximum heating and cooling rates, which prevent the development of thermally induced fracturing when applied...

... Abstract: The results obtained in the project FR-TI3/325 – Research on a thermally loaded rock - perspectives of underground thermal energy storage are presented in this paper. The project was designed to study thermal energy flow in granitic rock (tonalite), both in terms of efficiency...

.... Upstream Oil & Gas rock salt rock salt mass rock mass natural gas storage Simulation numerical simulation operation Reservoir Characterization thermally strength damage strength construction convergence cavity lux wolter storage cavity cavern design load-bearing behaviour abandonment...

... 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...

... ABSTRACT The propagation of thermally driven cracks as a means of enhancing reservoir permeability is of interest in geothermal reservoir stimulation. A numerical model based on the complex hypersingular integral equation is developed and used to examine the plausibility and the conditions...

... INTRODUCTION ABSTRACT: The permeability of Pocheon granite was measured for samples cracked thermally at temperature ranging 200 to 600øC as a function of pressure to 40 MPa. Samples with induced tension fractures were also measured at pressure up to 55 MPa. The permeability of the whole...

... ABSTRACT: Geomechanical response to thermal loading at the proposed Yucca Mountain repository for highlevel nuclear waste may result in changes in rock-mass hydrological properties within laterally discontinuous zones in the repository horizon. The altered zones would be characterized...

... special considerations in a repository design. One such very important unique feature that must be reflected in the repository design is the consideration of "Thermal Load" (also called Areal Power Density) associated with the nuclear waste. Because of rock and groundwater responses associated...

... ABSTRACT ABSTRACT Measurements of thermally induced displacements at Stripa showed that they were non-linear and smaller than those predicted by calculations using linear thermoelasticity. The quartz monzonite at Stripa is intensively jointed. The effects of extensive joints on thermally...

.... Cross Section View of Heater Test #1 (Available in full paper) 2. ROCK MASS PROPERTIES The rock mass properties required for the predictive analyses are the thermal conductivity (k), specific heat (C p ), density (p¿), coefficient of thermal expansion(a) surface heat transfer coefficient ( W...

...-rock permeability thermally cross-sectional area variation College Station porosity asperity-height distribution function asperity crack porosity Gangi velocity variation resistivity transport property Greenwood mechanically equivalent fracture brace cohesiveness permeability...

... ABSTRACT We have studied experimentally and theoretically the formation of thermally induced cracks in axially loaded, thick-walled hollow cylinders (3.5 mm 10 x 47.2 mm 0D) of Westerly granite which are heated externally, while the inner surface is maintained at a cooler temperature...

... ABSTRACT ABSTRACT A new concept of thermal crushing of hard rocks is examined in this study. The theoretical methods developed to analyze thermal stresses and fragmentation induced by partial and complete surface heating of rock blocks are correlated with experimental results. A three...