PACKER Russian patent published in 2007 - IPC E21B33/128 

FIELD: oil production, particularly downhole device for repeated pipe string interval pressure testing in well.

SUBSTANCE: packer comprises mandrel 1 with figured slot 2 on outer surface thereof. The figured slot 2 has alternating axial short 3 and long 4 sections. Self-sealing collar 5 is installed in upper mandrel 1 part. Located under the collar 5 is support 6. Sealing member 7 and cone 8 are serially installed on the mandrel 1 under support 6. The sealing member 7 is made as self-sealing collar, which prevents liquid flow in top-down direction. Ferrule 9 with guiding pin 10 is installed on mandrel 1 below cone 8 so that the ferrule 9 may slide in axial direction. Guiding pin 10 is located in slot 2 of mandrel 1. Ferrule 9 is provided with springing centralizers 11 and slips 12 arranged along ferrule periphery. Slips 12 are spring-loaded by means of springing plates 13. Head 14 with weight 15 is fixedly connected to upper end of mandrel 1. Head 14 has radial orifices 16 made in upper part thereof. Cap 17 provided with radial pin 18 is installed over the orifices 16. Weight 15 is made as cup put on head 14 and sealing radial orifices 16 so that the orifices 16 may be opened under downward head 14 movement. Through axial grooves 19 are made on outer surface of weight 15. The grooves are adapted for radial pin 18 of head 14 cap 17 receiving. Radial channels 20, which permanently communicate weight 15 interior 21 with ambient space, are made in weight 15. Lower radial channels 23 are created in mandrel 1.

EFFECT: possibility to perform pressure-testing of pipes in low-diameter springs and decreased costs.

2 dwg