Protection techniques for Putaohua oil reservoir in Tai 105 cooperative developing block

Tai 105 cooperative developing block is a lithologic reservoir of low or extra low permeability.Reservoir thickness is small,air permeability is low,reservoir physical property is poor.It is susceptible to damage so that permeability may be further low and production may be reduced or lose completely.We have conducted five susceptivitytesting in order to protect oil reservoir and enhance oil recovery.The final result indicates that most samples are sensitive moderately or less moderately,and the higher permeability of oil reservoir is,the slighter damage level is;the more serious damage level is,the lower permeability of oil reservoir is.We have applied a series of reservoir protection measures on the base of low or extra low permeability characteristics.First,we have selected entry well fluids,secondly,we have used many advanced reservoir protection techniques during the stages of well drilling,completion perforation and water injection development, and gained distinct effect.Reservoir damage level has been reduced mostly and oil production per thickness has been enhanced.