Y-UNIT MULTI-SHAFT SYSTEM Russian patent published in 2017 - IPC E21B17/02 E21B7/08 E21B43/14 

FIELD: mining.

SUBSTANCE: group of inventions relates to multi-shaft wells. System for use in multi-shaft well comprises multi-shaft well set, arranged in multi-shaft well. Multi-shaft well set includes Y-unit, including protective casing and built-in bypass chute, arranged along Y-unit outer part, rising pipes side column, tightly connected with protective casing and passing into multi-shaft well side shaft, rising pipes main column, tightly connected with protective casing and passing into multi-shaft well main shaft, and upper in shaft rising pipes column, tightly connected with protective casing and passing upward by well from Y-unit, and control line located in built-in bypass chute and laid to side shaft without overlapping connection. At that, Y-unit additionally comprises sealing shaft upper end diverter, located in protective casing above opening adapter to provide use of Y-unit for separate well fluid producing from at least one of multi-shaft well main shaft and side shaft.

EFFECT: technical result is reduction of probability of leakage, corrosion and damage to equipment in side shafts.

19 cl, 9 dwg