Practical DST Interpretation Seminar
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Oil & Gas Finding Aspects of Hydrodynamics
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16 Ways to Identify Bypassed Pay From DST Data
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Oil & Gas Finding Aspects of Hydrodynamics
(How to Use Pressure and Fluids Data in Exploration and Field Development)

Course Outline

Now did you all understand that.1. Introduction and History of the use of Pressure Data in Exploration.

2. Sources of pressures and salinity data

  a) DSTs - Drillstem Tests

  b) Production Tests

  c) RFTs - Wireline Tests

3. Screening the data

  • How to obtain valid stable pressures from the data

  • How to distinguish mud filtrate from true formation water

  • How to determine correct subsurface fluid gradients

4. Using pressure / depth graphs to correlate reservoirs (are zones continuous or separate?)

5. How to predict gas/oil/water contacts downdip from new discovery wells.

6. How to make Potentiometric Surface and Pressure Maps.

7. How to find permeability barriers (Stratigraphic traps) from pressure drops in the reservoir.

8. Identifying areas of updip and downdip flow.

9. Tilled oil/water contacts

10. Capillary pressures

11. Identifying "Flushed" areas

12. Hydrodynamic traps (accumulations without any apparent seal)

13. Causes of Pressure Anomalies - Underpressure and Geopressure.

14. Using chemical water analysis to correlate zones - Stiff Diagrams

15. Effect of hydrodynamics on unconformity type traps

16. Modern Concepts - Pressure Compartments

17. Estimate times of migration from saturation pressures of pools

18. Interating hydrodynamics with differential entrapment/migration pathways

Class Projects (Case Histories)

STUDENTS START WITH RAW DATA AND PROGRESS THROUGH ALL STEPS TO COMPLETED MAPS.

1. Defining a Stratigraphic Trap (800 MMBBL Oilfield), North Alberta. A reservoir pressure/continuity map is made to define major sand pinchout edge. Raw pressure/fluid data prior to discovery is used.

  • It will be shown how the oilfield could have been initially missed due to a false pressure from an old DST.

  • Students will predict extent of fild from discovery DST pressure to decide land acquisition strategy.

2. Identifying Flushed Vs. Prospective Areas in Saskatchewan. Students make regional potentiometric surface maps to define flow direction in Winnipegosis, Midale and other zones.

These identify:

  • Broad non-prospective areas of updip flow where low fields occur

  • More prospective areas of localized downdip flow which is the main trapping mechanism for the 600 ft. oil column in Steelman and Midale/Weyburn fields

3. How to Rapidly Assess an Unfamiliar Overseas Basin Using Regional Pressure Maps

  • Regional study of a middle East or S.E. Asia basin undertaken

  • Will whow the permeability distribution

  • Highlight areas of stratigraphic traps to test

  • Determine if hydrodyanmics can cause observed tilted oil/water contgacts in existing fields

4. Finding Giant But Subtle Gas Reserves (B.C.)

  • Students given a few small isolated (1 Bcf) gas pools with intersperesed "water" tests

  • Gas pressure continuity exercise shows mis-correlation by industry

  • Pools really form one huge accumulation and "water" was filtrate

  • Now over 70 wells drilled with 1 Tcf reserves!

  • Spectacular recent example of hydrodynamics used as gas finding tool

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December 2009
© 2009 Hugh W. Reid & Associates Ltd.