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Produced Water Reinjection Performance Joint Industry Project

Produced Water Reinjection Performance Joint Industry Project. TerraTek, Inc. Triangle Engineering Taurus Reservoir Solutions (DE&S) E-first Technologies Advantek International. A simple damage model for matrix PWRI injection (in soft sands and in general). (Tony) Settari, D.A. Walters

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Produced Water Reinjection Performance Joint Industry Project

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  1. Produced Water Reinjection PerformanceJoint Industry Project TerraTek, Inc. Triangle Engineering Taurus Reservoir Solutions (DE&S) E-first Technologies Advantek International

  2. A simple damage model for matrix PWRI injection (in soft sands and in general) • (Tony) Settari, D.A. Walters TAURUS Reservoir Solutions Ltd.

  3. Goal: • To see if simple description of plugging can be developed which • Is capable of matching most matrix data • Is based on measurable parameters (as opposed to “type curve” matching) which can be related to lab data • Can simulate (or predict) effects of workovers • Is suitable for simulation models • Deliverable: Spreadsheet model for analysis of P, Q vs time data for inclusion in the Toolbox.

  4. Model assumptions • Steady state flow • Simple permeability vs throughput relation • Radial, currently single layer model • Piston-like injected water displacement • Fixed outside pressure and radius Not specific to soft formations

  5. Permeability model k/k0 = 1 /[ 1 +  (V/A )n] k0 – initial (undamaged) permeability K - damaged permeability V - cum volume passing through area A  - parameter (damage strength) n - parameter (exponent)

  6. Effect of  on permeability decline due to damage

  7. Effect of n on permeability decline due to damage

  8. Overall computational model

  9. Data input and assumptions • Input both BHIP and rate, + basic reservoir data • Model honors BHIP (interpolates between entries) and calculates injection rate Qic. • Match the observed rate by changing damage parameters

  10. Data input and assumptions • Workovers (acid treatments, filter changes) are described by: • Time and size of the job • Effectiveness (fraction of perm damage removed) • Skin and damage parameters after the job

  11. Output from the model

  12. Output from the model

  13. Experience – Gulf of Mexico • 5 wells, data from Wennberg (also SPE 38180) • All wells can be matched individually very well • Reasonable consistency in parameters • Ability to model workovers is the key

  14. Experience – Elf 3 • Initial time periods only • Some indication of fracturing based on skin needed • Good matches of both wells

  15. Another data (anonymous)

  16. Conclusions • The model is surprisingly realistic, easy to match • Can be incorporated into more complex numerical simulators • May be easily made even more realistic: • Variable reservoir pressure • Multilayer model • Driven from rate and predicting pressures • Make physics more realistic (stripping of PW of solids), etc. • Fracture conditions? • May be worthwhile to do additional work

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