PACKER-PLUG Russian patent published in 2011 - IPC E21B33/12 

FIELD: oil and gas production.

SUBSTANCE: packer-plug consists of mandrel with internal cylinder recess, plug and upper stop, of packing element, of packing element holder, and of main and additional cones connected to correspondingly main and additional oval sockets. Holding balls are installed in orifices of the mandrel and from inside they interact with a removable unit, while from outside they interact with a hollow bushing beneath connected with the additional cone. A thrust washer is tied with main and additional oval sockets. The removable unit is equipped with an external lengthwise channel communicated to space under a packing element. The additional cone is lengthwise split in form of sectors for additional oval sockets and is connected to the hollow bushing to perform radial transfers inside. The internal and external circular recesses correspondingly are made on the thrust washer. The recesses are arranged opposite to each other and hold a spring ring. The spring ring comes out of the internal or external circular recess upon main oval sockets projecting into a working position.

EFFECT: raised reliability of arresting packer plug in well and elimination of packer plug jamming at its break away in well; reduced load to removable unit at packer-plug release; decreased time for extraction of packer plug from well.

4 dwg