CONNECTION OF SHAPED TUBES OF SHUTTERS OF WELLS Russian patent published in 2014 - IPC E21B17/42 E21B29/10 

FIELD: oil and gas industry.

SUBSTANCE: connection of shaped tubes of well shutters includes shaped tubes with cylindrical ends, which are equipped with sleeved and nipple thread on mutually facing surfaces. Besides, there are sealing devices of the connection, which are made in the form of two elastic rings. One of the rings is installed in an expanded annular coupling end on the side of internal joint of thread between the mutually facing cylindrical surfaces of the threaded and annular sections. In the nipple end there is a constriction for the second elastic ring on the side of an external joint of thread between the mutually facing cylindrical surfaces of the threaded and annular sections. The external joint is made in the form of tightly adjoining and mutually facing conical tube surfaces. Above and/or below the threaded connection on the cylindrical section there is a constriction in the form of alternating annular bulges and cavities. An elastic cuff is welded on the outer surface of the constriction flush with the cylindrical section.

EFFECT: reducing stiffness of the connection cross section and excluding liquid flow between walls of the shutter and the well.

2 dwg