SPE Reservoir Evaluation & Engineering
Volume 15, Number 3, June 2012, pp. 290-299

SPE-143016-PA

Use of Pressure/Rate Deconvolution To Estimate Connected Reservoir-Drainage Volume in Naturally Fractured Unconventional-Gas Reservoirs From Canadian Rockies Foothills

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DOI  More information 10.2118/143016-PA http://dx.doi.org/10.2118/143016-PA

Citation

  • Chen, A. and Jones, J.R. 2012. Use of Pressure/Rate Deconvolution To Estimate Connected Reservoir-Drainage Volume in Naturally Fractured Unconventional-Gas Reservoirs From Canadian Rockies Foothills. SPE Res Eval & Eng  15 (3): 290-299. SPE-143016-PA. http://dx.doi.org/10.2118/143016-PA.

Discipline Categories

  • 6.6 Reservoir Monitoring/Formation Evaluation

Keywords

  • tight gas play, naturally fractured reservoirs, deconvolution analysis, connected drainage volumes, reservoir surveillance

Summary

Case studies are presented in this paper to demonstrate the use of the pressure/rate deconvolution-approach in estimating drainage areas for wells completed in some of the naturally fractured tight gas reservoirs of the Canadian Rockies foothills. These case studies demonstrate the application of deconvolution to two key carbonate-stratigraphical horizons in the area: the Triassic Baldonnel and the Permo-Carboniferous Taylor Flat formations. In these structural plays with significant areal formation-rock heterogeneity, the matrix-rock properties controlling the gas storativity are low, with porosity between 3 and 6%, causing low matrix-rock permeability (from 0.01 and 0.1 md). However, all of these formations have been thrusted, overturned, and subjected to reverse faulting. These diagenetic factors have created swarms of natural fractures that control flow rates and may define rock volumes connected to individual wells.

In each well, a preproduction flow test was performed with the intent of ensuring acceptable flow rates and scoping facility design. At this stage of early development, initial-gas-in-place (IGIP) estimates were derived mainly from geophysical mapping, with plans to calibrate the IGIP number through the application of gas material balance, rate-transient analysis, and/or simple late-time rate decline. The rate-history data available in the early stage of production were integrated with pressure-buildup (PBU) data collected later in the production life of the well during annual or routine shut-in periods that were relatively short. Application of deconvolution in this paper is aimed at detecting early signs of pseudosteady-state pool depletion and estimating connected drainage volume. The deconvolution procedures help calibrate and/or reconcile geosciences-defined volumetric resource sizes, map remaining reserves, and help identify possible infill-drilling opportunities.

© 2012. Society of Petroleum Engineers

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History

  • Original manuscript received: 24 February 2011
  • Meeting paper published: 24 May 2011
  • Revised manuscript received: 7 December 2011
  • Manuscript approved: 17 January 2012
  • Published online: 10 May 2012
  • Version of record: 12 June 2012