APPLICATION METHOD OF PROTECTIVE COATING TO INTERNAL AND EXTERNAL SURFACES OF TUBING AND INTERNAL SURFACE OF CASING PIPES, AND DEVICE FOR METHOD'S REALISATION Russian patent published in 2010 - IPC E21B41/02 E21B17/00 F16L58/14 

FIELD: oil and gas industry.

SUBSTANCE: in order to apply protective coating to internal surface of tubing and casing pipes, protection layer in granules placed in a container is lowered to the well on a string of additional pipes, molten by means of electric heating elements. Electric power is supplied to the elements via electrical cable fixed on external surface of additional pipes. Protection layer is squeezed through atomisers located in the container, a piston installed above the container and brought into action with the solution which is supplied from the surface through internal cavity of additional pipes. There formed is protection layer with gauge assembly located below the container with protection compound. At that, there carries out is rotation and lifting of string of additional pipes. Application of coating to external surface of tubing is carried out on the surface. Protection compound is supplied with a pump via atomisers.

EFFECT: increasing efficiency of equipment protection against deposits.

3 cl, 2 dwg