Fluid Identification in Light Hydrocarbons With Use of NMR and Downhole Fluid Analyzers--A Case Study
- Authors
- Marie Van Steene (Schlumberger) | Mario Ardila (Schlumberger) | Richard Nelson (BP Egypt) | Amr Fekry (BP Egypt) | Adel Farghaly (RWE Dea)
- DOI
- https://doi.org/10.2118/150886-PA
- Document ID
- SPE-150886-PA
- Publisher
- Society of Petroleum Engineers
- Source
- SPE Reservoir Evaluation & Engineering
- Volume
- 16
- Issue
- 04
- Publication Date
- July 2013
- Document Type
- Journal Paper
- Pages
- 401 - 411
- Language
- English
- ISSN
- 1094-6470
- Copyright
- 2013. Society of Petroleum Engineers
- Disciplines
- 5.2.1 Phase behavior and PVT measurements, 5.6.1 Open hole/cased hole log analysis
- Downloads
- 2 in the last 30 days
- 587 since 2007
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Summary
In hydrocarbon reservoirs, fluid types can often vary from dry gas tovolatile oil in the same column. Because of varying and unknown invasionpatterns and inexact clay-volume estimations, fluid-types differentiation onthe basis of conventional logs is not always conclusive. A case study ispresented by use of advanced nuclear-magnetic-resonance (NMR) techniques inconjunction with advanced downhole-fluid-analysis (DFA) measurements andfocused sampling from wireline formation testers (WFTs) to accurately assessthe hydrocarbon-type variations. The saturation-profiling data from an NMRdiffusion-based tool provides fluid-typing information in a continuous depthlog. This approach can be limited by invasion. On the other hand, formationtesters allow taking in-situ measurements of the virgin fluids beyond theinvaded zone, but at discrete depths only. Thus, the two measurements ideallycomplement each other. In this case study, NMR saturation profiling wasacquired over a series of channelized reservoirs. There is a transition from awater zone to an oil zone, and then to a rich-gas reservoir, indicated by boththe DFA and the NMR measurements. Above the rich gas, is a dry-gas intervalthat is conclusively in a separate compartment. Diffusion-based NMR identifiesthe fluid type in a series of thin reservoirs above this main section, in whichno samples were taken. NMR and DFA both detect compositional gradients,invisible to conventional logs. The work presented in this paper demonstrateshow the integration of measurements from various tools can lead to a betterunderstanding of fluid types and distribution.
| File Size | 2 MB | Number of Pages | 11 |
References
Akkurt, R., Bachman, H.N., Cao Minh, C. et al. 2009. Nuclear MagneticResonance Comes Out of Its Shell. Oilfield Rev. 20 (4):4-23.
Ardila, M., Hegeman, P., Dong, C. et al. 2008. Applications of EnhancedDownhole Fluid Analyzer for the North Sea Operations. Paper presented at theSPWLA 49th Annual Logging Symposium, Edinburgh, Scotland, 25-28 May.
Betancourt, S.S. Bracey, J., Gustavson, G. et al. 2006. Chain of Custody forOilfield Samples Using Visible-Near-Infrared Spectroscopy. AppliedSpectroscopy 60 (12): 1482-1487.
Brie, A., Pampuri, F., Marsala, A.F. et al. 1995. Shear Sonic Interpretationin Gas-Bearing Sands. Paper SPE 30595 presented at the SPE Annual TechnicalConference and Exhibition, Dallas, Texas, 22-25 October. http://dx.doi.org/10.2118/30595-MS.
Cao Minh, C., Heaton, N.J., Ramamoorthy, R. et al. 2003. Planning andInterpreting NMR Fluid-Characterization Logs. Paper SPE 84478 presented at theSPE Annual Technical Conference, Denver, Colorado, 5-8 October. http://dx.doi.org/10.2118/84478-MS.
Dong, C., Mullins, O.C., Hegeman, P.S. et al. 2002. In-Situ ContaminationMonitoring and GOR Measurement of Formation Fluid Samples. Paper SPE 77899presented at the SPE Asia Pacific Oil and Gas Conference and Exhibition,Melbourne, Australia, 8-10 October. http://dx.doi.org/10.2118/77899-MS.
Godefroy, S., Zuo, J.Y., Fujisawa, G. et al. 2008. Discussion on FormationDensity Measurements and Their Applications. Paper SPE 114648 presented at theSPE Annual Technical Conference and Exhibition, Denver, Colorado. 21-24September. http://dx.doi.org/10.2118/114648-MS.
Heaton, N.J., Cao Minh, C., Kovats, J. et al. 2004. Saturation and ViscosityFrom Multidimensional Nuclear Magnetic Resonance Logging. Paper SPE 90564presented at the SPE Annual Technical Conference and Exhibition, Houston,Texas, 26-29 September. http://dx.doi.org/10.2118/90564-MS.
Hurlimann, M.D., Freed, D.E., Zielinski, L.J. et al. 2008. HydrocarbonComposition From NMR Diffusion And Relaxation Data. Paper presented at theSPWLA 49th Annual Logging Symposium, Edinburgh, Scotland, 25-28 May.
Mullins, O.C., Fujisawa, G., Elshahawi, H. et al. 2005. Identification ofVertical Compartmentalization and Compositional Grading by Downhole FluidAnalysis; Toward a Continuous Downhole Fluid Log. Paper presented at the 46thSPWLA Annual Logging Symposium, New Orleans, Louisiana, 26-29 June.
Mullins, O.C., Hashem, M., Elshahawi, H. et al. 2004. HydrocarbonCompositional Analysis in-situ in Openhole Wireline Logging. Paper presented atthe 45th SPWLA Annual Logging Symposium, Netherlands, 6-9 June.
Mullins, O.C., Zuo, J., Freed, D. et al. 2010. Downhole Fluid AnalysisCoupled With Novel Asphaltene Science for Reservoir Evaluation. Paper presentedat the SPWLA 51th Annual Logging Symposium, Perth, Australia, 19-23 June.
Weinheber, P. and Vasques, R. 2006. New Formation Tester Probe Design forLow-Contamination Sampling. Paper presented at the 47th SPWLA Annual LoggingSymposium, Veracruz, Mexico, 4-7 June.
Whitson, C.H. and Brule, M. 2000. Phase Behavior, Vol. 20, 1-17.Richardson, Texas: Monograph Series, SPE.
Zuo, J.Y., Zhang, D., Dubost, F. et al. 2008. EOS-Based Downhole FluidCharacterization. Paper SPE 114702 presented at the SPE Asia Pacific Oil andGas Conference and Exhibition, Perth, Australia, 20-22 October. http://dx.doi.org/10.2118/114702-MS.
