Stress around a wellbore

Conference · Wed Jan 01 04:00:00 EST 1969 · Soc. Pet. Eng. AIME, Pap.; (United States)

OSTI ID:5235362

Deily, F H; Owens, T C

A study was made of the stress state in a porous elastic body, with particular emphasis on variations in selected failure criteria. The objective was to relate predicted changes in stress and failure criteria with fracture initiation experienced in certain forms of lost circulation, as opposed to hydraulic fracture extension. The 3 principal stresses at the well bore were expressed as functions of well-bore pressure; in addition, values of 8 additional parameters were varied over realistically expected ranges to determine their possible importance on the principal stresses. These 8 parameters were the 3 tectonic stresses, formation fluid pressure, pore pressure at the wall, Poisson's ratio, the ratio of unjacketed to jacketed rock compressibilities, and position around the well bore. Two failure criteria, the maximum principal stress and Von Mises number, were determined for the well stress condition chosen. Calculated results show that small changes (5%) in tectonic stresses can cause larger changes in well-bore stress (and potential failure) than very large (100%) changes in Poisson's or compressibility ratios.

• Research Organization: Esso Production Res Co.
• OSTI ID: 5235362
• Report Number(s): CONF-690997-
• Conference Information: Journal Name: Soc. Pet. Eng. AIME, Pap.; (United States) Journal Volume: SPE2557
• Country of Publication: United States
• Language: English

Related Subjects

58 GEOSCIENCES
580300* -- Mineralogy
Petrology
& Rock Mechanics-- (-1989)
BOREHOLES
CAVITIES
COMPRESSIBILITY
FAILURES
FRACTURES
MATERIALS
MECHANICAL PROPERTIES
MECHANICS
POISSON RATIO
POROUS MATERIALS
RESERVOIR PRESSURE
ROCK MECHANICS
STRESS ANALYSIS
STRESS INTENSITY FACTORS
TECTONICS
WELLS