ADDITIONAL CASING STRING CEMENTING DEVICE Russian patent published in 2010 - IPC E21B33/14 E21B33/12 

FIELD: oil-and-gas industry.

SUBSTANCE: invention related to oil-and-gas industry, particularly to constraction and repair of wells, with casing string failure. Additional casing string cementing device includes sealing and cementing units, also centraliser. The sealing unit includes a case with toothed cuttings and a sleeve, and installed on the case parker, consisting of a elastic sleeve and top and bottom stops. The cementing unit includes a case with a barrel on the top and a shoe on the bottom, a slide gate, installed in the sealing unit opposite to radial channels and the sealing unit sleeve ring fetch. The top stop is movable, the parker stop connected to the sealing unit case with share elements. The sealing element sleeve equipped with external centralisers from the top.

EFFECT: offered additional casing string cementing device provides significantly increase in operation safety, as it allows to centralise the device and additional tubing string, the offered device descends on the tubing string end inside of the failed string, which assures ACS high quality cementing, also the device allows to take it out in case of parkers non-hermetic landing before ACS cementing, which excludes ACS cementing under the parker, and excludes incident in the well.

2 dwg