SPE Reservoir Evaluation & Engineering
Volume 11, Number 4, August 2008, pp. 696-706

SPE-99954-PA

A Hybrid Approach To Improve Reserves Estimates in Waterdrive Gas Reservoirs

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DOI  More information 10.2118/99954-PA http://dx.doi.org/10.2118/99954-PA

Citation

  • Yildiz, T. 2008. A Hybrid Approach To Improve Reserves Estimates in Waterdrive Gas Reservoirs. SPE Res Eval & Eng11 (4): 696-706. SPE-99954-PA.

Discipline Categories

  • 6.7 Reserves Evaluation
  • 6.7.1 Estimates of Resource in Place

Summary

The conventional reserves estimate methods for waterdrive reservoirs are well established. Typically, the techniques proposed by Havlena and Odeh (1963 and 1964) and McEwen (1962) are used. In general, the reserves estimated from these procedures are not unique since the recorded historical production data are simultaneously solved for aquifer parameters and reserves. Normally, multiple combinations of reserves and aquifer parameters match the field data equally well. Hence, a range of reserves--rather than a unique value--is found. The upper and lower limits of the reserves range may vary several-fold.

In this paper, a hybrid approach that makes use of available methods is used to narrow the reserves range estimates in waterdrive gas reservoirs. The hybrid approach combines the McEwen method, apparent gas-in-place (GIP) vs. time, the modified Roach (1981) method, and the modified Havlena and Odeh method for partial waterdrive.

© 2008. Society of Petroleum Engineers

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History

  • Original manuscript received: 17 March 2006
  • Meeting paper published: 12 June 2006
  • Revised manuscript received: 3 March 2008
  • Manuscript approved: 19 March 2008
  • Version of record: 20 August 2008