Gas Injection Well Zonal Isolation Achieved Despite Wellbore Restrictions,Increases Gas Injection by More than 30

摘要

A gas injection well 31 was being utilized to aid in the condensate production from the Barco,Guadalupeand Mirador formations.The injection well utilized 15 MSCFD into the Mirador,Barco and Guadalupeformations.After some time in operation and following several injection evaluations,it became clear thatmost of the gas injected was entering the upper Mirador formation rather than being equally distributedacross the three formations as planned.After an extended review of the situation,the operator decided to work the well over in order to improvethe condensate base curve that is associated with the Barco/Guadalupe formations of the neighboringwells.By closing off the perforations in the Mirador,all of the gas injection would enter the Barco andGuadalupe formations and be produced in the two adjacent wells,40Z and H38.The Mirador had three setsof perforations requiring isolation,which are the intervals(15,500-ft – 15,630-ft)/15,500-ft – 15,400-ft)/(15,290-ft – 15,390-ft).(See Figure 1).