000			02797nmc a2200229 4500
005			20260520005610.0
008			260224s2001 xxu ing
041			_aInglés
245	0	0	_aNeural Networks Models for Estimation of Fluid Properties _bSPE 69624
260			_aDallas, Texas _bSociety of Petroleum Engineers _c2001
270			_a12/09/06 ; 17/07/01
520			_aFluid viscosity is one of the most important parameters necessary to establish reservoir production and economical potential. Until the appearance of NMR techniques in the oil industry, oil viscosity determination was limited to laboratory tests and correlations with API gravity. Nuclear Magnetic Resonance is a technique based on the magnetic behavior of hydrogen nuclei. This behavior is the consequence of fluid properties, as viscosity and density, and its interactions with its surroundings. The use of NMR signals for estimation of fluid viscosity has been based mainly on correlations with single NMR parameters as logarithmic (T2log) and geometric averages (T2geo). However, qualitative analysis of NMR T2 distributions indicate that changes on NMR patterns translate on changes on viscosity, that sometimes are not reflected on the averages used. This fact brought the idea of developing a multivariable model, which considers the use of all points of the NMR T2 distribution to enhance fluid properties estimation. The use of neural network technique was identified and several models were developed. The models were developed using the T2 distribution and the cumulative T2 distribution. The model constructed based on the cumulative T2 distribution, showed a better prediction of oil viscosity, incrementing the correlation with real values from 64% using the T2log correlation to 87% with the neural network. This work was done on 24 oil samples from different Venezuelan fields covering a range from 6 to 700 cP. An additional model was developed selecting 15 samples from the same field covering a range from 25 to 72 cP. Comparing the results of the model vs. the estimation through T2log correlations, the prediction was enhanced from 89% to 99%, creating an excellent model for fluid viscosity determinations through NMR signals.
942			_cCONGTP
100	1		_aAlcocer, Yuri _96565
100	1		_aRodrigues, Patricia _96513
111	2		_aLatin American and Caribbean Petroleum Engineering Conference (7th : 2001 mar. 25-28 : Buenos Aires, Argentina) _95738
700	1		_aRodrigues, Patricia _96513
711	2		_aLatin American and Caribbean Petroleum Engineering Conference (7th : 2001 mar. 25-28 : Buenos Aires, Argentina) _95738
800	1		_aAlcocer, Yuri _96565
999			_c131191 _d131191
856			_uhttps://biblioteca.iapg.org.ar/ArchivosAdjuntos/LACPEC2001/Spe69624.pdf