DEVICE FOR CEMENTING SHANK IN WELL Russian patent published in 2011 - IPC E21B33/14 E21B17/06 

FIELD: oil and gas industry.

SUBSTANCE: device consists of shank with cone at the top and pressurising seat at the bottom; and valve unit connected to shoe equipped with filter is located below the above seat. At that, aluminium plug is screwed onto lower end of shoe. At that, device includes pipe string with nipple having the possibility of tight interaction with cone of shank, and disconnector. Cone is provided on the inner side with narrowing for nipple and above located pins. Disconnector attaches upper part of shank to lower part of pipe string and is made in the form of hollow housing located on pipe string above nipple, with external slots for the cone pins. When pins are arranged in slots the nipple is located below annular narrowing of cone, in transport position. And when pins are arranged outside slots of cone the nipple is located within the annular narrowing of cone.

EFFECT: device has simple design, which optimises work technique and saves financial expenses, and allows shortening the time spent on shank cementing in well, owing to minimising the number of lowering and lifting operations.

4 dwg