Packer
Packers have rubber or metal elements which provide mechanical barrier in the well. Depending on well design, testing or production requirement, a packer can be used to isolate a reservoir, open hole, a high pressure zone, casing leak, liner lap leak or to anchor tubing etc. Packers are classified based on temperature rating, differential pressure rating, setting and retrieving mechanisms, packing element, gripping mechanism, fluid environment etc. Various types and designs of packers are available with different companies and the selection is done based on specific conditions and requirements.