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ROBIN Gas Well

1. Well Setup

1.1. Background

  • Review the pressure gradient. If it is lower, there is no need for a geomechanical workflow.

1.2. PVT

  • Change the PVT setting from GOR to Dry/Wet Gas.

1.3. Bottomhole Pressure

  • Calculate bottomhole pressure.
  • Select Woldesemayat & Ghajar.

1.4. Liquid Loading Plot

  • Open the Liquid Loading plot and confirm the well is not liquid loaded.

2. Interpretation

2.1. Flowing Material Balance

  • Use Flowing Material Balance to estimate OGIP.
  • Result: OGIP = 12,000 MMscf.

Flowing Material Balance result showing OGIP

3. Analytical RTA

3.1. Typecurve

  • Interpretation: linear flow with some bounded flow, with early data issues.

Analytical RTA Typecurve showing linear and bounded-flow behavior

3.2. Fractional

  • Interpretation: linear flow, with skin and bounded flow detected.

Analytical RTA Fractional plot showing linear flow with skin and bounded flow

3.3. Classical

  • Interpretation: linear, bounded, and skin are present.

Analytical RTA Classical plot showing linear, bounded, and skin behavior

4. Numerical RTA

4.1. First Run

  • Use 10 larger models.
  • Lock OGIP = 12,000 MMscf (from Flowing Material Balance).
  • Run.

4.2. Second Run

  • Drop Sw to 32%.
  • Run.
  • Results:
  • OGIP = 12 Bcf
  • LFP = 157k

5. Single Well Modeling

5.1. Numerical Model

  • Time Stepping = Smart.
  • Well Control = BHP.
  • Run.

5.2. Forecast

  • Forecast End Day = 18,000.
  • Use Constant BHP.
  • Run.
  • Result: EUR = 11.4 Bcf.