000			02020nab a2200193 4500
005			20260520001754.0
008			260224s2009 xxu
100	1		_aYaghoubi, Ali A. _942558
100	1		_aZeinali, M. _942559
245	0	0	_aDetermination of magnitude and orientation of the in-situ stress from borehole breakout and effect of pore pressure on borehole stability - Case study in Cheshmeh Khush oil field of Iran
260			_cagos. 2009
270			_a14/06/2010 ; 11/06/2010
300			_a11 p. ; 116-126
520			_aTranscripción del resumen del autor. The detailed profile of the orientations of borehole breakouts as a function of depth were investigated in wells CK-8 and CK-9 in the Cheshmeh Khush oilfield in south-west of Iran. Borehole breakouts without tensile induced fractures were detected from UBI logs. By analyzing statistically of borehole breakout orientation in two wells, it was found that while a mean azimuth of maximum horizontal stress in CK-8 is N–S (s.d = 0.4°); the azimuth of breakout in CK-9 varies as a function of depth with a mean azimuth 345° + 26°; which since no 3D seismic survey has been run upon the field, assumed to be caused by active tectonic state. By utilizing presence and absence of borehole breakout and tensile induced fracture, as well as density, rock strength, pore and mud pressure in deviated borehole, in situ stresses magnitude in CK-8 were constrained. The experiment showed that the state of stress is normal faulting regime and maximum horizontal stress magnitude is closer to SV comparing with Shmin. Pore pressure was predicted by deploying Eaton's method on observed sonic data deviation from normal compaction trend. Considering the behavior of breakout and pore pressure in CK-8 in accordance with rock strength changes, demonstrated that the borehole gets more stable as pore pressure increases.
581			_a3-4
773	0		_tJournal of Petroleum Science & Engineering _g67
942			_cARTICULO
999			_c170934 _d170934