Methods To Obtain Quick Estimates of Formation Parameters in Interference Tests Derived From Features of the Line-Source Solution--Theory and Application
- Pierre-David Maizeret (Schlumberger)
- Document ID
- Society of Petroleum Engineers
- SPE Reservoir Evaluation & Engineering
- Publication Date
- February 2013
- Document Type
- Journal Paper
- 29 - 39
- 2013. Society of Petroleum Engineers
- 5.6.4 Drillstem/Well Testing
- 0 in the last 30 days
- 644 since 2007
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Interference testing is the oldest, but still the most effective, way of establishing communication between wells and determining the interwell-reservoir transmissibility. Yet these tests are not run frequently because often the results are difficult to analyze as a result of unforeseen complications. This paper presents practical methods derived from the properties of the line-source solution that is used to design and interpret effective interference tests. In single-well transient tests, earlytime features of the exponential integral function occur too early to be observed. However, these features appear much later in an interference test and can be used in an observation well to estimate the storativity and transmissibility ratios of the reservoir. The pressure response and the log derivative of the pressure intersect on the log-log diagnostic plot, and the pressure response itself exhibits an inflection point. With these characteristics, simple geometrical methods are proposed to estimate reservoir parameters. Moreover, a new expression of the "lag time," or delay in the response, is formulated. The particular case of falloff or buildup is studied in detail, because the time lag in the reservoir response can bring extra information. A field example is included to demonstrate the application of these methods to actual data and their usefulness to a practicing well-test engineer.
|File Size||1 MB||Number of Pages||11|
Bourdet, D. 2002. Well Test Analysis: The Use of Advanced InterpretationModels. The Netherlands: Elsevier.
Brigham, W.E. 1970. Planning and Analysis of Pulse-Tests. J. Pet Tech 22 (5): 618-624. http://dx.doi.org/10.2118/2417-PA.
Daungkaew, S., Hollaender, F., and Gringarten, A.C. 2000. Frequently AskedQuestions in Well Test Analysis. Paper SPE 63077 presented at the SPE AnnualTechnical Conference and Exhibition, Dallas, Texas, 1-4 October. http://dx.doi.org/10.2118/63077-MS.
Earlougher, R.C. 1977. Advances in Well Test Analysis. SPE MonographVol. 5, Henry L. Doherty Series, Richardson, Texas: Society of PetroleumEngineers of AIME.
Johnson, C.R., Greenkorn, R.A., and Woods, E.G. 1966. Pulse-Testing: A NewMethod for Describing Reservoir Flow Properties Between Wells. J. PetTech 18 (12): 1599-1604. http://dx.doi.org/10.2118/1517-PA.
Kamal, M. and Brigham, W.E. 1975. Pulse-Testing Response for Unequal Pulseand Shut-in Periods. J. Pet Tech 15 (5): 399-410. http://dx.doi.org/10.2118/5053-PA.
Kuchuk, F.J. 2009. Radius of Investigation for Reserve Estimation FromPressure Transient Well Tests. Paper SPE 120515 presented at the SPE MiddleEast Oil and Gas Show and Conference, Manama, Bahrain, 15-18 March 2009. http://dx.doi.org/10.2118/120515-MS.
Lescarboura, J.A., Walther, H.C. Jr., and Wilson, P.L. 1975. Design andAnalysis of Interference Tests. Paper SPE 5314 presented at the SPE CaliforniaRegional Meeting, Ventura, California, 2-4 April. http://dx.doi.org/10.2118/5314-MS.
Tiab, D. and Kumar, A. 1980. Application of the p¢D Functionto Interference Analysis. J. Pet Tech 32 (8):1465-1470. http://dx.doi.org/10.2118/6053-PA.