Oil and Gas Division > Case Studies > Subsurface Norway

Use of TransAT to study the interaction of clustered oil-production wells


Overview: The effect of multiwell thermal interaction is important for closely-spaced wells including offshore platforms, subsea and arctic productions. The main objectives of this study are to conduct co- and counter-flowing well temperature predictions to assure that the material and equipment withstand the maximum temperature impact. Temperature effects on the formation, cement behind casing, annular pressures and wellhead growth are matters of concern.

The challenge: Numerical solutions are needed to provide quantitative results on the effects of oil production well-clustering on the temperature field, in particular:

  • Likely and maximum wellhead temperatures when flowing individual wells
  • Temperature changes when oil production wells are clustered
  • Maximum temperature changes in the formation / soil
  • Temperatures and gradients at the various interfaces (casings, cement, soil)

TransAT Solution: To assess the impact of well clustering on wellhead temperatures and stresses, a model capturing transient heat transfer between the wells in 2D planes at different depths is developed. Vertical heat conduction is assumed to be negligible compared to the near-wellbore radial variation. The fluid flow in the wells is assumed uniform and with a constant heat-transfer coefficient, and can thus be treated using a simplified 1D model or by coupling to a sophisticated tool, like OLGA or Ledaflow.

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Dr Denis Métrailler
ASCOMP Switzerland