TUBING HEAD Russian patent published in 2001 - IPC

FIELD: oil field equipment, particularly, devices for suspension of tubing from wellhead. SUBSTANCE: essence of the invention consists in that metal threaded pipe holder of tubing head has convex spherical surface on lower end face of bead and coaxial to thread. Threaded pipe holder is located on convex spherical surface for inclination on concave spherical surface of upper end face of bead in hole body of tubing head. In this case, spherical surfaces are commensurate and elastomer packing is installed between spherical surfaces. EFFECT: higher serviceability and self-adjustment of upper tubing pipe. 3 cl, 1 dwg