PLUG PACKER Russian patent published in 2009 - IPC E21B33/12 

FIELD: oil and gas industry.

SUBSTANCE: invention refers to oil industry, and is intended for temporary covering of well shaft. Plug packer consists of a mandrel with internal cylindrical mining device; on external side of mandrel installed is a sealing element with a stop. Above the latter there is a thrust bush, and between it and the stop - retaining ring with notches. On the mandrel opposite the stop there provided are annular notches with the direction opposite to the ring notches. Below sealing element there located is the main cone with main sockets, locking ring, and additional cone with additional sockets. Main sockets and additional sockets are connected to the main cone and additional cone respectively by means of a dovetailed joint, and to the locking ring edges - by means of T-joint. Mandrel is equipped with stops located along the perimeter and at one and the same level between additional sockets with the possibility of passing through openings provided in locking ring, and interconnected to the main cone when in operating position. Inside the mandrel there telescopically installed is a detachable joint made in the form of a branch pipe with external cylindrical mining device in upper part. In lower part of the mandrel there are radial holes located wherein fixing balls are installed. Plug is made in the form of a blind transverse partition installed inside the mandrel, and a hollow bush rigidly attached to additional cone from the outside. Blind transverse partition and mandrel can be made as one solid part. Balls are interconnected on the one side to detachable joint, and on the other one - to hollow bush. By means of shear elements, the mandrel is connected to detachable joint and main cone. On the stop from above there is a casing of setting tool rested. Detachable joint is plugged from above, and setting tool rod is made hollow, and connected to mandrel by means of a breaking element. From below, the hollow cylinder is borne against the hollow transverse partition downwards by means of a spring, which is located inside on the lower end of the mandrel, at that spring is in a compressed position. Mandrel below hollow transverse partition is equipped with a vertical through slot wherein installed is a pin with the possibility of axial movement. On one side, pin is rigidly connected to additional cone, and on the other one - to spring-loaded hollow cylinder. Sealing element is made in the form of barrel-shaped seals separated from each other with a support ring.

EFFECT: saving of time required for removal, avoiding unnecessary lowering and raising operations, as well as guaranteed removal of plug packer out of the well.

3 dwg