SPE Reservoir Evaluation & Engineering
Volume 13, Number 4, August 2010, pp. 603-613

SPE-123982-PA

A New Pressure/Rate-Deconvolution Algorithm To Analyze Wireline Formation-Tester and Well-Test Data

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DOI  More information 10.2118/123982-PA http://dx.doi.org/10.2118/123982-PA

Citation

  • Pimonov, E., Ayan, C., Onur, M., and Kuchuk, F. 2010. A New Pressure-Rate Deconvolution Algorithm to Analyze Wireline Formation Tester and Well-Test Data. SPE Res Eval & Eng  13 (4): 603-613. SPE-123982-PA. doi: 10.2118/123982-PA.

Discipline Categories

  • 6.6.3 Pressure Transient Testing
  • 6.8 Fundamental Research in Reservoir Description and Dynamics
  • 6.6.4 Drillstem/Well Testing
  • 6.6.1 Well Logging
  • 6.3.1 Flow in Porous Media

Keywords

  • Pressure-rate deconvolution, transient testing, well testing, formation testing

Summary

Reconstructing constant-rate drawdown-pressure response and its logarithmic time (or Bourdet) derivative by deconvolution from multirate pressure-transient data is very important for wellbore-/reservoir-system identification and interpretation. In recent years, the use of pressure/rate deconvolution has increased considerably because of significant improvement of the algorithms. In this paper, we present a new deconvolution algorithm based on a weighted Euclidean norm in the Tikhonov (1963) regularized objective function so that one can assign weights to individual pressure- and rate-measurement points, and, thus, define different error estimates for different sections of the data. Incorporating such features into the deconvolution algorithm is very useful to mitigate the effects of unreliable pressure and rate measurements and the sections of the data not obviously consistent with the wellbore/reservoir model.

We present two applications of the new algorithm using real field pressure/rate transient data sets. In addition to conventional drillstem-test (DST) well-test data, we apply the algorithm to wireline formation-tester (WFT) pressure transients, which are usually also referred to as interval pressure-transient tests (IPTTs). The results show that the new deconvolution algorithm presented in this paper is useful in interpreting pressure/rate transient data from both formation and well tests.

© 2010. Society of Petroleum Engineers

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History

  • Original manuscript received: 30 July 2009
  • Meeting paper published: 5 October 2009
  • Revised manuscript received: 11 April 2010
  • Manuscript approved: 17 April 2010
  • Published online: 12 August 2010
  • Version of record: 24 August 2010