a device employed with a packer to surge, or clean, open perforations; also called surge disk.

a squeeze cement job with open perfs above the packer.

two packers separated by a spacer of variable length. A straddle packer may be used to isolate sections of open hole to be treated or tested or to isolate certain areas of perforated casing from the rest of the perforated section.

a heavy-mandrel service squeeze tool with on-off tool used in drilling operations during storm interruptions.

a drillable service packer, a retainer.

a generic term to describe a retrievable service packer.

position the correct number of feet or joints of pipe from the packer to the surface tree, or from the rig floor to the stack.

A packer assembly that can be removed from the wellbore only by drilling or milling. Drillable packers, and similar tools such as bridge plugs, are typically made from cast iron, aluminum, plastic or similar brittle materials.