UNIVERSAL WELLHEAD PACKER Russian patent published in 2014 - IPC E21B33/03 

FIELD: oil and gas industry.

SUBSTANCE: method of pressure test of the preventer in the well includes the mounting of the preventer with pipe rams, mounting of the universal wellhead packer into connecting sleeve of the tubing string. The packer contains a hollow mandrel and the housing above it. The external diameter of the housing conforms to external diameter of remote branch pipe of the ball valve and to the through passage opening of pipe rams of the preventer. On the surface of the mandrel at least, one longitudinal blind channel is made, where one power cable is placed. The mandrel has treaded connections from both ends. On the mandrel the demountable centralizer is placed. Under the centralizer the opened cavity for inputs and/or cable pulling is kept. From the external part of the centralizer the longitudinal channels and/or through holes for fluid flowing are made. In the top part of the centralizer cavity the radial key groove with sealing element is made. There a bottom end part of the housing is mounted. The demountable radial housing contains a sleeve with a cut for cable. On the housing a blind bearing and compressing plates are placed. The plates have radial and/or cylindrical form, from one end part they have a horizontal plain, and from the other part - cone or bottle throat shape. The inner drift diameter of the plates corresponds to external diameter of the housing. The bearing plates can rotate radially and move axially upwards with reference to the housing. The movement of the compressing plate is limited by a collar.

EFFECT: improvement of reliability of sealing of the wellhead.

8 cl, 9 dwg