Determination of in situ stresses from excavation-induced stress changes

1990 ◽  
Vol 23 (3) ◽  
pp. 167-184 ◽  
Author(s):  
Daihua Zou ◽  
P. K. Kaiser
Keyword(s):  
Induced Stress ◽  
In Situ Stresses ◽  
Stress Changes

scholarly journals Erratum for “Determination of in Situ Stresses in Concrete Dams”

1972 ◽  
Vol 98 (1) ◽  
pp. 169-169
Author(s):  
Merlin D. Copen ◽  
George B. Wallace
Keyword(s):  
Concrete Dams ◽  
In Situ Stresses

scholarly journals Mechanism of shear failure near fracture face during drainage process of CBM well

2018 ◽  
Vol 10 (8) ◽  
pp. 3309-3317
Author(s):  
Ping Xiong ◽  
Wang-shui Hu ◽  
Hai-xia Hu ◽  
Hailong Liu
Keyword(s):  
Coal Seam ◽  
Hydraulic Fracture ◽  
Shear Failure ◽  
Failure Envelope ◽  
Hole Pressure ◽  
Bottom Hole Pressure ◽  
Induced Stress ◽  
In Situ Stresses ◽  
Bottom Hole

Abstract In this paper, whether the coal fines can be induced by shear failure during drainage process has been discussed in detail. By coupling with the percolation theory, the elasticity mechanics were used to construe the extra stresses in the formation surrounding with the hydraulic fracture. The safe window of the bottom hole pressure was also calculated from the failure envelope. The research shows that the formation pressure on the fracture surface of the coal seam is negatively related with the bottom hole pressure, and the induced stress is positively related with the bottom hole pressure during the drainage process of fractured CBM wells. The pore pressure around the fracture changed due to pore-elastic effects, which also caused a significant change of the in situ stresses. In order to avoid the breakout of the coal seam around hydraulic fracture during drainage process, the model of the reasonable bottom hole pressure is also built.

Determination of In-Situ Stresses From Hydraulically Fractured Spherical Cavities

1983 ◽  
Vol 105 (2) ◽  
pp. 125-127 ◽  
Author(s):  
W. E. Warren
Keyword(s):  
Hydraulic Fracturing ◽  
Principal Stress ◽  
Spherical Cavity ◽  
Hydraulic Fractures ◽  
Stress Measurements ◽  
In Situ Stresses ◽  
Spherical Cavities ◽  
Stress Directions

Several problems in analysis can arise in estimating in-situ stresses from standard hydraulic fracturing operations if the borehole is not aligned with one of the principal stress directions. In these nonaligned situations, the possibility of fracturing a spherical cavity for estimating the in-situ stresses is investigated. The theory utilizes all the advantages of direct stress measurements associated with hydraulic fracturing and eliminates the geometrical problems associated with the analysis of hydraulic fractures in cylindrical boreholes.

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