Stress Response Investigations Related to In-Situ Gasification of Coal

1977 ◽  
Vol 99 (4) ◽  
pp. 627-633 ◽  
Author(s):  
S. H. Advani ◽  
L. Z. Shuck ◽  
K. Y. Lee
Keyword(s):  
Stress Intensity ◽  
Stress Response ◽  
Combustion Front ◽  
Thermal Effects ◽  
Temperature Profiles ◽  
Intensity Factors ◽  
Underground Gasification ◽  
In Situ Stresses ◽  
Front Stability

The influence of in-situ stresses and thermal effects on underground gasification of bituminous coals is studied. Evaluations of temperature profiles, stress magnitudes and stress intensity factors are given. The effects of stresses and temperature on coal fracture permeabilities are discussed. In addition, the influence of stress on combustion front stability in thin seams is discussed.

Experimental investigation of fluid thermal effects on fracture brittleness

2019 ◽  
Vol 59 (1) ◽  
pp. 457
Author(s):  
Alireza RezaGholilou ◽  
Hossien Salemi ◽  
Nathan Tarom ◽  
Pouria Behnoudfar ◽  
Mohammad Sarmadivaleh
Keyword(s):  
Thermal Effects ◽  
Treatment Approach ◽  
Injection Rate ◽  
Fluid Temperature ◽  
True Triaxial ◽  
In Situ Stresses ◽  
Initiation And Propagation ◽  
True Triaxial Stress ◽  
Rock Mechanical Properties

Fracture extent and formation quality are the key parameters affecting hydraulic fracturing results. Fracture brittleness, initiation and propagation are dominantly ruled by in situ stresses and rock mechanical properties which cannot be manipulated. However, operation parameters such as injection rate, viscosity and temperature of fluid can be adjusted for fracturing treatments. This paper focuses on a thermal treatment approach that affects brittleness. We investigated fractures when fluid temperature is lower than formation. Experiments were conducted using synthetic 50-mm cubic samples in a newly built true triaxial stress cell. This cell was fitted with cooling and heating auxiliary apparatus which enabled injection of fluids of various temperatures in the presence of orthogonal stresses. The samples and test records are evaluated in details to develop and upscale the results for real applications such as tight shale gas formations. Findings indicate that brittleness of material increases when considerable temperature differences exist between rock and injection fluid.

DETERMINATION OF RESIDUAL STRESSES AND STRESS INTENSITY FACTORS BY REMOVING LOCAL MATERIAL

2017 ◽  
Vol 48 (4) ◽  
pp. 377-398
Author(s):  
Svyatoslav Igorevich Eleonskii ◽  
Igor Nikolaevich Odintsev ◽  
Vladimir Sergeevich Pisarev ◽  
Stanislav Mikhailovich Usov
Keyword(s):  
Stress Intensity ◽  
Residual Stresses ◽  
Stress Intensity Factors ◽  
Intensity Factors ◽  
Local Material
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