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Matrix injection experience in a disposal well (NAM-1)

Matrix injection experience in a disposal well (NAM-1). Well NAM-1. Produced water injection into far flank of reservoir Sandstone 1-2 Darcy TVD ca. 1800 m, injection interval 110 m Cased - perforated (6spf 60  DP) OIW 50-250 ppm TSS ‘high’ (from settling tank). FeS, wax, sand.

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Matrix injection experience in a disposal well (NAM-1)

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  1. Matrix injection experience in a disposal well (NAM-1)

  2. Well NAM-1 • Produced water injection into far flank of reservoir • Sandstone 1-2 Darcy • TVD ca. 1800 m, injection interval 110 m • Cased - perforated (6spf 60 DP) • OIW 50-250 ppm • TSS ‘high’ (from settling tank). FeS, wax, sand. • II ca. 40 m3/d/bar. 1500 m3/d injection @ 60 bar THP. • No indication of stress anomaly. 0.7 psi/ft  100 bar THP! • PW  negligible cooling

  3. NAM-1: Injection data Acid job NRV removal

  4. NAM-1: Injectivity index NRV removal Acid job

  5. Well NAM-1: fractured or not? • II deterioration very slow: 25% in 2 yrs (600,000 m3 of water) • Step-rate tests: Constant slope (II) of 40-50 m3/d/bar. No inflection point. • ‘Ideal’ (undamaged) matrix II estimated at 90 m3/d/bar. • SR tests: Intercept p-axis dependent on shut-in time. ‘Leaking box’ reservoir? (nearby faults known). • Injection pressure far below frac pressure. • II appears to increase with injection rate.

  6. Well NAM-1: fractured or not?

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