routine process - isolation bridge plug

"Multi-stage treatments can be used to selectively treat zones of interest with frac treatments being designed for each group of sands being stimulated. The need for zonal isolation and the additional time needed for sequential pumping of multiple treatments can add considerable cost. However, this additional cost is usually quickly recovered by the incremental gas production. Multi-zone completions with limited entry, mechanical bridge plugs or packer isolation devices are routine."

http://media.godashboard.com/gti/4ReportsPubs/4_7GasTips/Fall04/UnconventionalGasReserveOpportunitiesAndTechNeeds.pdf

JB