WINDOW CONNECTION FOR CONSTRUCTION OF SIDE SHAFT OF WELL AND METHOD TO CLOSE SUCH WINDOW Russian patent published in 2015 - IPC E21B29/06 

FIELD: construction.

SUBSTANCE: group of inventions relates to window connections, systems and methods for window opening during construction of a side shaft of a well. The window connection for construction of a side shaft of a well comprises: a tubular element made as capable of connection to a tubular column; a previously formed window in a tubular element, besides, the specified window is set by at least one cutting line formed on the inner surface of the tubular element and creating preferably a weakened area in the tubular element, providing for the possibility to controllably extract the specified window from inside, besides, at least one cutting line comprises at least one circumferential section and at least one longitudinal section; and a ledge passing in circumferential direction, arranged at the specified previously formed window with a circumferential section, at least one cutting line formed on the inner side of the tubular element, besides, the specified ledge protrudes radially inside from the inner surface of the tubular element.

EFFECT: reduced quantity of wastes in a well shaft during construction of a side shaft of a well.

19 cl, 10 dwg