Determination of in-situ stress from anelastic strain recovery measurements of oriented core
A reliable method for determining the in situ stress state in deep formations is of great importance to the gas industry in designing massive hydraulic fracture treatments of low permeability reservoirs. Knowledge of the horizontal in situ stress directions and magnitudes would allow prediction of fracture azimuth and height. In this paper a method using anelastic strain recovery measurements of oriented core will be presented as a reliable and practical tool for determining both the directions and magnitudes of the principal horizontal in situ stresses in deep formations. The principal horizontal stress directions are determined directly from the principal horizontal strain recovery directions. The principal horizontal stress magnitudes are calculated from the principal strain recovery magnitudes, overburden stress, and Poisson's ratio of the rock using a viscoelastic model by Blanton. In addition, petrophysical measurements of the core parallel to the principal directions of strain recovery, at atmospheric pressure and at elevated confining pressure, suggest that the strain recovery process is a consequence of microcrack formation and expansion.
- Research Organization:
- Sandia National Lab.
- DOE Contract Number:
- AC04-76DP00789
- OSTI ID:
- 5451954
- Report Number(s):
- CONF-830305-
- Journal Information:
- Soc. Pet. Eng. AIME, Pap.; (United States), Journal Name: Soc. Pet. Eng. AIME, Pap.; (United States) Vol. SPE/DOE11649; ISSN SEAPA
- Country of Publication:
- United States
- Language:
- English
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Prediction of hydraulic fracture azimuth from anelastic strain recovery measurements of oriented core
Related Subjects
030900* -- Natural Gas-- Artificial Stimulation
Plowshare-- (-1989)
AZIMUTH
CALCULATION METHODS
COMMINUTION
DRILL CORES
ENHANCED RECOVERY
FAILURES
FRACTURES
FRACTURING
GEOLOGIC DEPOSITS
HYDRAULIC FRACTURING
MEASURING METHODS
MECHANICAL PROPERTIES
MINERAL RESOURCES
NATURAL GAS DEPOSITS
NATURAL GAS WELLS
PLANNING
POISSON RATIO
RECOVERY
RESERVOIR PRESSURE
RESOURCES
STRESS ANALYSIS
WELLS