Hydraulic fracturing in porous and nonporous rock and its potential for determining in-situ stresses at great depth
Thesis/Dissertation
·
OSTI ID:5291228
The process of hydraulic fracturing as a method of determining in situ stresses in brittle elastic formations at great depth is analyzed both theoretically and experimentally. Theoretically, it is found that in attempting to relate the recorded hydraulic fracturing pressures to tectonic stresses, it is essential to investigate whether the fluid used to induce and extend fracture penetrates and flows into the rock strata. This flow raises the pore fluid pressure and creates additional stresses and displacements which lower the critical pressure required to initiate fracture and reduce the width of the newly formed fracture. Based on this additional stress field, a realistic evaluation of in-situ stresses in permeable strata is obtained.It is suggested that if reliable instrumentation is used to record position, inclination, and orientation of fractures, the method of hydraulic fracturing could be successfully utilized in estimating stresses at great depth in both porous and nonporous rock, as least in cases where the principal stress directions are parallel and normal to the borehole axis.
- OSTI ID:
- 5291228
- Country of Publication:
- United States
- Language:
- English
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