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An operator in south India was facing production issues in an exploratory gas well. The company was trying to evaluate the producability of the formation which had near-wellbore formation damage from drilling, completions, and perforating activities. In addition, the low native permeability of the formation (10% porosity and 1-4 mD permeability) had led to greater formation loss and permeability in the damage zone.

The operator observed low or no inflow over five intervals using conventional perforating techniques. In tight rock formations, conventional perforating provides limited depth of penetration, leading to insufficient connectivity between the wellbore and the formation. To alleviate this situation, they used the TerraPERM™ perforating service by Baker Hughes, a GE company (BHGE).

BHGE used its StimGun™ propellant-assisted perforating system and deep penetration charges. StimGun dynamically cleans and stimulates the near-wellbore area for improved wellbore connectivity. The decision was made to use StimGun, although it required an integrated knowledge of perforating strategy, formation properties, well architecture, and well stimulation techniques, which would be provided by BHGE.

Challenges & Results
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Challenges

  • Near-wellbore formation damage needed to be overcome in order to evaluate the formation and recover production
  • Formation had low native permeability
  • Conventional perforating options were not viable due to insufficient connectivity between the wellbore and the formation

Results

  • The job was executed successfully without operational risk
  • Well production resumed at the rate of 3240 m3 per day
  • Propellants used overcame near-wellbore damage and achieved deeper penetration