DEVICE FOR RUNNING CASING STRINGS AND METHOD FOR ITS OPERATION Russian patent published in 2022 - IPC E21B7/20 E21B19/00 

FIELD: oil industry.

SUBSTANCE: inventions group relates to the oil industry, in particular, to devices for running casing strings containing packer elements. The device for running casing strings consists of a sub for fastening to the outlet pipe of the upper power drive of the drilling rig, the body of the device with a thrust collar, which is made with the possibility of attaching the sub to the body of the device by a threaded connection. The internal cavity of the device is hollow for the possibility of supplying the washing solution. An inner tube with a hollow cavity is attached to the body of the device. On the outer body of the inner pipe there is a centralizer, below which there are at least two cuffs of cup packers of a conical shape. Tightness is carried out with the help of packer cuffs, after the flushing fluid is supplied through the internal cavity of the device, the isolation of the packer elements does not allow the flushing fluid to flow through the open top of the lowered casing string. A skirt is installed between the body and the sub, which is equipped with a rubber band at the bottom to provide protection against deformation of the standard threads of the running casing string.

EFFECT: inventions group provides reduction of time during casing string descent for refilling and flushing, at the same time it allows to run non-stop (no turning/turning of the flushing sub, refilling), the possibility in any position of the casing string to start reciprocating with flushing using an elevator spider, this allows to use the proposed device several times in one run of the casing string.

5 cl, 1 dwg