The WELL ISOLATION TOOL has annular isolation capabilities. It allows the operator to isolate the wellbore (below the WELL ISOLATION TOOL circulating ports) from hydrostatic and induced pressures and still circulate at increased rates. This is often done to control fluid loss to open perforations or an openhole interval below the tool.
With the WELL ISOLATION TOOL, high circulation rates can be used to displace the upper part of a well without applying pressure to the lower part. It is most effective where there is no set-down point, such as a liner top for conventional weight-activated circulating tools. It is ideal where fluid loss to perforations or openhole sections would be expected below the tool, and it can be run above pressure-sensitive equipment such a fluid isolation valves.