Electricity: measuring and testing – Particle precession resonance – Using well logging device
Patent
1995-06-26
1997-12-09
O'Shea, Sandra L.
Electricity: measuring and testing
Particle precession resonance
Using well logging device
G01V 332
Patent
active
056964480
ABSTRACT:
A simple, pore-level model for diffusion and NMR relaxation of oil-water mixtures in water wet pores has been developed. In addition to lending physical insight into the relaxation time behavior of mixed pore fluids, the model can be used to generate a practical tool for interpreting diffusion log data, i.e., a T2 vs. D cross plot. Locating points on the cross plot simultaneously yields the near wellbore water saturation and the rock pore size. For light oils, T2 is shown to be mainly a pore size indicator whereas D is controlled mainly by Sw. The pore size "resolution" decreases as oil viscosity and/or Sw decreases. A preliminary verification of the model has been made with limited core data and the results of applying the model to interpreting NMR log data are encouraging. The capability to separate the effects of pore size from fluid saturation on NMR response of pore fluids indicates an important potential advantage of the T2 and D measurement combination over standard T2 logging for characterizing formation pore size and related reservoir flow properties.
REFERENCES:
patent: 3508438 (1970-04-01), Alger et al.
patent: 4291271 (1981-09-01), Lauffer
patent: 4424587 (1984-01-01), Lauffer
patent: 4710713 (1987-12-01), Strikman
patent: 4717878 (1988-01-01), Taicher et al.
patent: 4719423 (1988-01-01), Vinegar et al.
patent: 4933638 (1990-06-01), Kenyon et al.
patent: 5212447 (1993-05-01), Paltiel
patent: 5363041 (1994-11-01), Sezginer
patent: 5432446 (1995-07-01), MacInnis et al.
patent: 5498960 (1996-03-01), Vinegar et al.
Morriss et al., "Hydrocarbon Saturation and Viscosity Estimation from NMR Logging in the Belridge Diatomite," 35th SPWLA Annual Logging Symposium (Jun. 19-22, 1994), pp. 1-24.
Carr et al., "Effects of Diffusion on Free Precision in Nuclear Magnetic Resonance Experiments," Physical Review, vol. 94, No. 3 (May 1, 1954), pp. 630-638.
Schlumberger Wireline & Testing, "Combinable Magnetic Resonance tool reliably indicates water-free production and reveals hard-to-find pay zones," (Jun. 1995).
Morris et al., "Field Test of an Experimental Pulsed Nuclear Magnetism Tool," SPWLA Annual Logging Symposium (Jun. 13-16, 1993), pp. 1-23.
Coates et al., "Core Data and the MRIL Show--A New Approach to `Formation Factor,`" National SPWLA Convention (Jun. 15, 1992), pp. 1-15.
Kleinberg et al., "Novel NMR Apparatus for Investigating an External Sample," Journal of Magnetic Resonance, (1992) pp. 466-485.
Coates et al., "An Investigation of a New Magnetic Resonance Imaging Log," National SPWLA Convention (Jun. 18, 1991), pp. 1-24.
Howard et al., "Proton Magnetic Resonance and Pore-Size Variations in Reservoir Sandstones," Society of Petroleum Engineers (1990), pp. 733-741.
Miller et al., "Spin Echo Magnetic Resonance Logging: Porosity and Free Fluid Index Determination," Society of Petrolum Engineers (1990), pp. 321-334.
Kenyon et al., "Pore Size Distribution and NMR in Microporous Cherty Sandstones," SPWLA Thirtieth Annual Logging Symposium Jun. 11-14, 1989), pp. 1-24.
Clavier et al.,"The Theoretical and Experimental Bases for the `Dual Water` Model for the Interpretation of Shaly Sands," Journal of Petroleum Technology (Apr. 1984), pp. 3-15.
Waxman et al., "Electrical Conductivities in Oil-Bearing Shaly Sands," Society of Petroleum Engineers Journal (1968) pp. 107-122.
Coates George R.
Mardon Duncan
Miller Daniel L.
Numar Corporation
O'Shea Sandra L.
Phillips Roger
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