SPE Reservoir Evaluation & Engineering
Volume 14, Number 6, December 2011, pp. 652-662

Summary

This paper investigates the use of pressure-pressure (p-p) deconvolution for interpretation of conventional multiwall-interference and wireline-formation-tester (WFT) interval pressure-transient tests (IPTTs). The investigation is limited to interference tests for which only a single source/sink well exists in a single-layer system. It is shown that the recent deconvolution algorithms developed for pressure-rate (p-r) deconvolution based on the same limitation (i.e., a single source/sink well) can also be used for performing p-p deconvolution by simply replacing the rate data in p-r deconvolution algorithms by the pressure data recorded at a source/sink location or at one of the observation locations. We show the applications of p-p deconvolution to both synthetic and field-transient test data sets from IPTTs and multiwall-interference tests. Specifically, we investigate the applicability of p-p deconvolution for inconsistent data sets where wellbore storage and skin may change from one flow period to another one. The results show that the impulse functions deconvolved from p-p deconvolution have signatures for various flow regimes (e.g., radial, spherical, linear) that are similar to those of p-r deconvolution except from the pseudosteady-state (pss)-flow regime, and, hence, could be used for model identification purposes in the similar way based on p-r deconvolution, but without requiring the flow-rate information.

© 2011. Society of Petroleum Engineers

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History

• Original manuscript received: 26 October 2009
• Meeting paper published: 7 December 2009
• Revised manuscript received: 21 March 2011
• Manuscript approved: 27 April 2011
• Published online: 12 December 2011
• Version of record: 28 December 2011