New Method of Well Test Analysis in Naturally Fractured Reservoirs Based on Elliptical Flow
- Alpheus Igbokoyi (University of Oklahoma) | Djebbar Tiab (University of Oklahoma)
- Document ID
- Society of Petroleum Engineers
- Journal of Canadian Petroleum Technology
- Publication Date
- June 2010
- Document Type
- Journal Paper
- 53 - 67
- 2010. Society of Petroleum Engineers
- 5.1 Reservoir Characterisation, 4.6 Natural Gas, 5.6.3 Pressure Transient Testing, 5.2.1 Phase Behavior and PVT Measurements, 5.8.6 Naturally Fractured Reservoir, 3.2.3 Hydraulic Fracturing Design, Implementation and Optimisation, 5.6.4 Drillstem/Well Testing, 4.3.4 Scale
- naturally fractured reservoirs, well test analysis, elliptical flow, permeability anisotrophy
- 0 in the last 30 days
- 848 since 2007
- Show more detail
- View rights & permissions
|SPE Member Price:||USD 10.00|
|SPE Non-Member Price:||USD 30.00|
Up-to-date well test analysis in naturally fractured reservoirs is based on the radial flow model. The radial flow model is only applicable to purely homogeneous systems and is a long-term solution in general. It cannot provide complete formation analysis in reservoirs that exhibit anisotropy. This study, therefore, presents a new method of estimating permeability anisotropy in naturally fractured reservoirs.
Maximum and minimum permeability are obtained from a single well test. The maximum permeability is attributed to the large-scale fractures in the system, while the minimum permeability may be caused by the small-scale fractures orthogonal to the large-scale fractures. In a situation where the fractures are oriented in one direction, the minimum permeability will reflect the matrix permeability. The type of flow path developed (narrow or wide flow path) can also be predicted. This is useful in predicting the direction of fluid-flow.
Application was made to four field examples, among which was an interference test. The interference test was used as a validation process. The results obtained are in agreement with that of the interference test method of analysis.
|File Size||1 MB||Number of Pages||15|
- Nelson, R.A. 2001. Geologic Analysis of Naturally FracturedReservoirs, second edition. Oxford, UK: Gulf Professional Publishing.
- Gouth, F., Moen-Maurel, L., Jeanjean, F., Soyeur, C., and Aziz, S.K. 2007.Characterization and ModellingStudy of a Triple Porosity Fractured Reservoir. Paper IPTC 11763 presentedat the International Petroleum Technology Conference, Dubai, 4-6 December. doi:10.2523/11763-MS.
- Guo, B. and Schechter, D.S. 1998. Use of Single-Well Test Data forEstimating Permeability Anisotropy of the Naturally Fractured Spraberry TrendArea Reservoirs. Paper SPE 39807 presented at the SPE Permian Basin Oil andGas Recovery Conference, Midland, Texas, USA, 25-27 March. doi:10.2118/39807-MS.
- Da Prat, G., Mannucci, J., Prado, L., and Millan, E. 1984. Use of Pressure Transient Testing ToEvaluate Fractured Reservoirs in Western Venezuela. Paper SPE 13054presented at the SPE Annual Technical Conference and Exhibition, Houston, 16-19September. doi: 10.2118/13054-MS.
- Beliveau, D. 1989. PressureTransients Characterize Fractured Midale Unit. J Pet Technol 41 (12): 1354-1362; Trans., AIME, 287. SPE-15635-PA.doi: 10.2118/15635-PA.
- Narr, W., Schechter, D.S., and Thompson, L.B. 2006. Naturally FracturedReservoir Characterization. Richardson, Texas: SPE.
- Warren, J.E. and Root, P.J. 1963. The Behavior of Naturally FracturedReservoirs. SPE J. 3 (3): 245-255; Trans., AIME,228. SPE-426-PA. doi: 10.2118/426-PA.
- Kuchuk, F. and Brigham, W.E. 1979. Transient Flow in EllipticalSystems. SPE J. 19 (6): 401-410; Trans., AIME,267. SPE-7488-PA. doi: 10.2118/7488-PA.
- Riley, M.F., Brigham, W.E., and Horne, R.N. 1991. Analytic Solutions for EllipticalFinite-Conductivity Fractures. Paper SPE 22656 presented at the SPE AnnualTechnical Conference and Exhibition, Dallas, 6-9 October. doi:10.2118/22656-MS.
- McLachlan, N.W. 1964. Theory and application of Mathieu functions.New York: Dover Publications.
- Papadopulos, I.S. 1965. Nonsteady flow to a well in an infinite anisotropyaquifer. Proc., Dubrovnik Symposium on the Hydrology of Fractured Rocks,International Association of Scientific Hydrology, Dubrovinik, Yugoslavia,21-31.
- Hantush, M.S. and Thomas, R.G. 1966. A Method for Analyzing aDrawdown Test in Anisotropic Aquifers. Water Resour. Res. 2 (2): 281-285. doi:10.1029/WR002i002p00281.
- Collins, R.E. 1961. Flow of Fluids Through Porous Materials. NewYork: Reinhold Chemical Engineering Series, Reinhold Publishing.
- Ramey, H.J. Jr. 1975. Interference Analysis for AnisotropicFormations--A Case History. J Pet Technol 27 (10):1290-1298; Trans., AIME, 259. SPE-5319-PA. doi:10.2118/5319-PA.
- Macus, H. and Evenson, D.E. 1961. Directional permeability in anisotropicporous media. Contribution 31, Water Resources Center, Hydraulic Laboratory,University of California, Berkeley, California (October 1961).
- Tiab, D. and Kumar, A. 1980. Application of the pD' function toInterference Analysis. J Pet Technol 32 (8): 1465-1470.SPE-6053-PA. doi: 10.2118/6053-PA.
- Tiab, D. 1995. Analysis of pressure andpressure derivative without type-curve matching--Skin and wellbore storage.J. Pet. Sci. Eng. 12 (3): 171-181.doi:10.1016/0920-4105(94)00040-B.
- Engler, T. and Tiab, D. 1996. Interpretation of pressure tests in naturallyfractured reservoirs without type curve matching. Paper SPE 35163 prepared forpresentation at the SPE Permian Basin Oil and Gas Conference, Midland, Texas,USA, 27-29 March.
- Bettam, Y. 2003. Interpretation of multi-hydraulically fractured horizontalwells in naturally fractured reservoirs. MS thesis, University of Oklahoma,Norman, Oklahoma (January 2003).
- Tiab, D., Igbokoyi, A.O., and Restrepo, D. 2007. Fracture Porosity From PressureTransient Data. Paper SPE 11164 presented at the International PetroleumTechnology Conference, Dubai, 4-6 December. doi: 10.2523/11164-MS.
- Bourdet, D. and Gringarten, A.C. 1980. Determination of Fissure Volume andBlock Size in Fractured Reservoirs by Type-Curve Analysis. Paper SPE 9293presented at the SPE Annual Technical Conference and Exhibition, Dallas, 21-24September. doi: 10.2118/9293-MS.
- Gringarten, A.C., Ramey, H.J. Jr., and Raghavan, R. 1974. Unsteady-State Pressure DistributionsCreated by a Well With a Single Infinite-Conductivity Vertical Fracture.SPE J. 14 (4): 347-360; Trans., AIME, 257.SPE-4051-PA. doi: 10.2118/4051-PA.
- van Everdingen, A.F. and Hurst, W. 1949. The Application of the LaplaceTransformation to Flow Problems in Reservoirs. Trans., AIME, 186:305-324.