000			01954nmc a2200229 4500
005			20260520005605.0
008			260224s2001 xxu ing
041			_aInglés
245	0	0	_aWhat Have We Been Doing Wrong in Wellbore Stability? _bSPE 69493
260			_aDallas, Texas _bSociety of Petroleum Engineers _c2001
270			_a12/09/06 ; 05/10/01
520			_aIdentification of the correct cause of wellbore instability is the key to quickly solve the problem. This paper presents some results of tests conducted to check the behavior of preserved shale samples when immersed in different solutions, trying to identify the importance and relevance of the osmosis as well as the effect of other components in the mud, such as the emulsifier. Results showed that not only the salinity of the mud is important. Also, in some situations, rock swelling did not follow what states the osmosis theory, leading to a conclusion that other phenomena are relevant and with a similar order of importance. The paper also discusses the mechanism of micro-cracking with subsequent fluid penetration, and the use of a truly non-invasive fluid to avoid the instability. Field cases are reported, demonstrating the effectiveness of using such approach. The paper also presents the problems of current rig site monitoring tests that can induce wrong interpretation of the real cause of the problems.
942			_cCONGTP
100	1		_aSantos, Helio _96148
100	1		_aPerez, Roberto _96149
111	2		_aLatin American and Caribbean Petroleum Engineering Conference (7th : 2001 mar. 25-28 : Buenos Aires, Argentina) _95738
700	1		_aPerez, Roberto _96149
711	2		_aLatin American and Caribbean Petroleum Engineering Conference (7th : 2001 mar. 25-28 : Buenos Aires, Argentina) _95738
800	1		_aSantos, Helio _96148
999			_c131004 _d131004
856			_uhttps://biblioteca.iapg.org.ar/ArchivosAdjuntos/LACPEC2001/Spe69493.pdf