Conclusions

  1. Reservoir consists of three sands as opposed to what was originally considered to be a single layer reservoir.
  2. Petrophysical studies show that the fraction of the pore volume occupied by water increases from sand #1 to sand #3. From the limited data that is available, it appears that the cut-off value of water saturation for water-free production is higher in sand #3 as compared to the other two sands.
  3. Responses to water flooding have occurred in most wells.
  4. Injection water breakthroughs to the producing wells indicating reservoir heterogeneity.
  5. Production response to water flooding indicates that sand #2 and sand #3 are in communication around the injector #3-1.
  6. Primary recovery has been 29% of OOIP.
  7. Secondary recovery from water flood has been very poor, i.e.; about 3% of reserves remaining at the onset of the flood, and thus significant recoverable reserves remain.

Future Studies

  1. Identify the connectivity between the sands and also the permeability distributions within the sands.
  2. Gather reservoir pressure and PVT data to carry out a material balance study to cross check the reservoir volumetrics.
  3. Simulate the field performance under solution gas drive and under the current water flood.
  4. Design an effective strategy to recover residual oil that has been bypassed by the waterflood in place.

References

  1. Doveton, J.H., W.L. Guy, W.L. Watney, G.C. Bohling, S. Ullah, and D. Adkins-Heljeson, 1996, Log Analysis of petrofacies and flow-units with microcomputer spreadsheet software: 1995 American Association of Petroleum Geologist Mid-Continent Meeting.
  2. Bhattacharya, S., W.L. Watney, J.H. Doveton, W.L. Guy, and Geoff Bohling, 1999, From geomodels to engineering models - opportunities for spreadsheet computing: 19th Annual B.F. Perkins Research Conference, Gulf Coast Section Society of Economic Paleontologists and Mineralogists Foundation, December 1999.
  3. Mathews, C.S., and D.G. Russell, 1967, Pressure buildup and flow tests in wells: SPE Monograph Volume 1, Henry L. Doherty Series.
  4. Reid, H.W., Modern concepts in drillstem testing: Hugh W. Reid & Associates Ltd, Calgary, Canada.
  5. McCain, W.D., The properties of petroleum fluids: 2nd Edition, PennWell Books, 1990, Tulsa, Oaklahoma.
  6. SPE Petroleum engineering handbook: 3rd printing, 1992, Richardson, Texas (page 37-2)
  7. API Bulletin D14, Statistical analysis of crude oil recovery and recovery efficiency: April 1994. (page 5)

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