Hydraulic fracturing in porous-permeable materials
Extensive laboratory tests have been conducted to study hydraulic fracturing initiation in porous-permeable materials under open-hole conditions. Hydrostone specimens containing a vertical central hole simulating a well bore were subjected to unequal 3-dimensional compressive loadings, parallel and perpendicular to the hole axis. Fractures due to internal pressurization of the model well bore were always tensile ruptures. Initiation pressures were close to values predicted theoretically for porous-permeable materials. Fractures were always either vertical, normal to the smaller horizontal compressive load, or horizontal initiated close to the end of the packed-off region. Three pressurizing rates (6 psi/sec, 60 psi/sec, 600 psi/sec) were tested on hydrostone 32/100, cubical samples. The resulting critical pressures were clearly dependent upon the rate of pressurization, in accordance with theories of strength which show an inverse relationship between the time a load is applied to a sample and its tensile strength. (13 refs.)
- Research Organization:
- Halliburton Co; Minnesota Univ
- OSTI ID:
- 5545813
- Report Number(s):
- CONF-680926-
- Journal Information:
- Soc. Pet. Eng. AIME, Pap.; (United States), Journal Name: Soc. Pet. Eng. AIME, Pap.; (United States) Vol. SPE2354; ISSN SEAPA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
020300 -- Petroleum-- Drilling & Production
58 GEOSCIENCES
580300* -- Mineralogy
Petrology
& Rock Mechanics-- (-1989)
BENCH-SCALE EXPERIMENTS
COMMINUTION
FRACTURE PROPERTIES
FRACTURING
HYDRAULIC FRACTURING
MATERIALS
MECHANICAL PROPERTIES
OIL WELLS
PERMEABILITY
POROSITY
POROUS MATERIALS
RESERVOIR ROCK
SIMULATION
STIMULATION
WELL STIMULATION
WELLS