Definition - What does Coning mean?

Coning is a situation whereby the oil and water contact or the gas and oil contact profile changes because of the drawdown pressure resulting from the production. It is one of the problems encountered during the production of oil and gas from a producing well. Coning is found more often in vertical or slightly deviated wells and also is a rate sensitive phenomenon which is associated with the high production rate from a vertical producing well.

Petropedia explains Coning

Coning is one of the production problems that need to be dealt with during the production stages of an oil or gas well. Effective oil production is always affected if gas or water coning takes place. Some of the important situations which lead to the occurrence of this problem could be:

  • Bottom water from a reservoir gets produced in a gas well.
  • When natural gas production crosses the threshold or gas cap from an oil well.
  • When water gets produced with bottom water drive from an oil well.

Some of the factors which can help in reducing Coning are:

  • Horizontal and vertical permeability.
  • Proper distances are maintained between the rock perforation and well contact.
  • Density differences between the liquids (oil, gas and water) should be maintained.
  • Relative permeability and Fluid viscosities to be monitored and maintained.

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