METHOD OF ISOLATING AND COMPLETING MULTI-ZONE FRAC PACKS

摘要

Multiple formations are isolated in the wellbore and fractured and gravel packed together. The bottom hole assembly can have a series of screens that are separated with packers in between and above and below the screen stack. The assembly is positioned where needed in the borehole and the topmost and lowermost packers (if used) are set. The bottom of the interval can alternatively be the hole bottom. With multiple intervals isolated a fracturing operation can take place for the entire isolated interval that can encompass multiple producing zones. The interval can also be gravel packed in a single operation. After the gravel pack of the interval, packers that are on the bottom hole assembly between screens that are aligned with perforations for different zones can be set into the gravel pack and get an effective seal against the casing to isolate the various producing zones from each other.