UNIVERSAL TRANSIENT COIL OF WELLHEAD FITTINGS (VERSIONS) Russian patent published in 2019 - IPC E21B33/47 

FIELD: wellhead fittings.

SUBSTANCE: invention relates to wellhead fittings and can be used in oil industry during well repair in downhole operations of pipe string, including during down-and-up operations in a steam-injection well of both single-row and two-row string. Disclosed is universal transient coil of wellhead fittings, including first-row pipe string holder pipe made in the form of a disc with two channels, support flange, sealing grooves and metal gaskets, pipe holder of the second row of pipes. In compliance with first version, universal adapter of wellhead fittings is installed on wellhead fittings reinforcement flange, consisting of guide nozzle welded to upper flange, and reciprocating guide sleeve, welded to lower flange, in lower and upper flanges are made sealing grooves with sealing metal gaskets, and guide branch pipe is equipped with external cylindrical recess and conical surface, tapering downwards, and on conic surface there is groove, in which sealing ring is arranged, and in external cylindrical recess of guide pipe there is a coupling nut, and mating guide branch pipe is equipped on top with external cylindrical ledge with thread, and below – process sections. At that, the reciprocating guide branch pipe is equipped with a reverse conical surface narrowing downwards, mating with the conical surface of the guide branch pipe when the coupling nut is turned into the upper thread of the mating guide pipe, with thrust of inner surface of union nut into lower end of external cylindrical recess of guide branch pipe. Upper flange is equipped with radial process channel and in initial position is sealed with plug. Upper flange is attached to preventer. Sealing ring is made of heat-resistant rubber. In compliance with second version, universal transient coil of wellhead fittings is installed on cross-pipe holder of first row of pipes, lower flange of which is made with cutout for pipe of long string, and the height of the guide pipe from the lower end of the lower flange to the lower end of the upper flange is greater than the length of the pipe string of the long pipe string fixed in the cross piece-pipe holder.

EFFECT: universal transient coil of wellhead fittings allows widening operational capabilities of wellhead fittings, providing installation of preventer on wellhead equipment, both during lowering and lifting operations in well with single-row and double-row pipes.

7 cl, 4 dwg