Squeeze and Circulating Pack Operations
Weatherford offers systems for performing circulating or squeeze gravel packs in monobore applications using coiled tubing (CT).
The GP one-trip gravel pack system uses a large-bore GP packer and a gravel pack setting/crossover tool that enables packer setting and pressure testing to be performed in the same run. The GP packer is run with the required amount of blank pipe and gravel pack screens below the packer. The GP packer is set hydraulically; increasing pressure actuates the opening of the gravel pack ports below the GP packer. Injection into the perforations below the packer is established and acid can be spotted, using the optional washpipe, or placed across the entire perforated interval. After the acid is allowed to soak, the annulus is closed and the gravel pack slurry is squeezed into the perforations, ﬁlling the perforation tunnels and the screen-casing annulus. The gravel is squeezed up to the calculated height in the blank pipe, and the screenout valve in the crossover tool opens a port that diverts the ﬂow from below the packer to the annulus above the packer. Opening the annulus allows excess gravel to be circulated out, if necessary; and pulling the crossover tool out of the packer mechanically and permanently closes the gravel pack ports.
An option is available for defeating the screenout valve, which allows the pack to be re-stressed before the crossover tool is picked up out of the packer bore. With this option, excess gravel is circulated after the crossover tool is picked up from the GP packer bore.
These systems are recommended for applications in which the packer system remains within the same basic ID in the production tubing or liner throughout the operation. GP Packers are ISO 14310 V-3-certiﬁed.