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Waterflood Management Case Study - Goal

Waterflood Management Case Study - Goal. Change waterflood strategy early in waterflood to maximize recovery: 12 months of waterflood performance Predicted ultimate waterflood recoveries are only half what was forecast How do we increase waterflood recovery ?.

nathalie-dumont
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Waterflood Management Case Study - Goal

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  1. Waterflood Management Case Study - Goal • Change waterflood strategy early in waterflood to maximize recovery: • 12 months of waterflood performance • Predicted ultimate waterflood recoveries are only half what was forecast • How do we increase waterflood recovery ?

  2. Waterflood Management – How ? • Step 1 - Design optimal waterflood strategy: • History match primary production • Step 2 - Change waterflood strategy continuously in real time to maximize recovery: • Why ? • Primary history match does not normally require understanding vertical/areal heteregenities • How ? • Downhole pressure data + tracer tests + simulator

  3. Waterflood – Tracer versus Pressure • Pressure Advantages: • Effect of pressure seen 10 times faster than tracer response • Time is money !

  4. Proposed Waterflood Sweep in Unconformity After 650 days of flooding :

  5. Proposed Waterflood Sweep in Upper After 650 days of flooding :

  6. Pressure Contour Maps in Both Sands After 285 and 650 days of flooding :

  7. Cumulative Production Map in Unconformity

  8. Oil+Water Bubble Map in Upper Sand

  9. Waterflood Results – Correct Perm Map Bypassed oil identified before water breakthrough Areas with water overinjection identified

  10. Waterflood Study Case Study - Results • Downhole pressures/production information was used to: • Generate accurate permeability distribution maps in the model • Discover bypassed oil/overinjection long before breakthrough: • Breakthrough anticipated in 3-96 months • Water injection strategy changed within first 15 months • Waterflood recovery may now be doubled • Overall water injection rates reduced by 30%

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