WELL HEAD STRIPPER Russian patent published in 2010 - IPC E21B33/06 

FIELD: oil and gas industry.

SUBSTANCE: device includes double-flange housing with the passage for the passage of tubes attached with couplings, sealing element from elastic material, which is placed between two centering skids and having feedthrough hole the diametre of which is less than outer tube diametre, and the nut interacting with upper centering skid. On lower edge of upper centering skid there located is annular cylindrical protrusion tightly interacting with upper part of feedthrough hole of sealing element. Cavity of stripper housing is interconnected with the well head and with atmosphere through holes. Sealing element can consist of two parts fixed against radial displacement relative to each other.

EFFECT: set of design features of stripper provides increase in reliability of its operation and decrease of operating costs.

2 cl, 3 dwg