|
Keywords
|
Acidizing, carbonate reservoir, skin factor, wormhole, production zone
|
|
Abstract
|
In the practice of oil production, various methods are used to improve the operation efficiency, the
success of which is associated with the processes occurring at the boundaries of oil-water-gas-rock. Acid
injection into the near-wellbore region is one of the most cost-effective methods of increasing the
production rate. The change in the permeability and porosity of the reservoir rock as a result of acidizing
is a complex process, as it is influenced by several parameters. To increase the performance of acidizing
and reduce the operation cost, the acid injection process should be simulated so that the optimal values of
injection rate and acid volume can be determined. In this work, the values of acid injection rate and
volume were optimized for production well. In the studied well, three interlayers (zones) with different
permeability were evaluated. The optimal values of the parameters were utilized to analyze the final skin
value after each acid treatment stage (preflush and main acid injection). The simulation results showed
that the skin factor has reached values after the completion of stimulation. The length of the wormhole
has also been significantly increased. The greatest radial penetration was observed in the more permeable
zone.
|