SIDE PORT OF CONTINUOUS FLUSHING Russian patent published in 2017 - IPC E21B21/00 

FIELD: oil and gas industry.

SUBSTANCE: invention relates to drilling of oil and gas wells and represents one unit of continuous well flushing system, providing circulation of drilling fluid without breaks for drill string growing and its disassembling while lifting. Device includes continuous flushing adapter with valve inside, hole in adapter wall and branch pipe inserted into this hole and fixed in it on adapter wall, drilling fluid supply line and device for its connection with branch pipe. Annular gap between branch pipe and body of adapter in its wall is sealed. Outer end of branch pipe is made in form of pipe section. For coupling with drilling fluid supply line additional branch pipe of L-shape or straight shape is used, one end of which is also made in form of pipe section. Diameter and other sizes of pipe sections on ends of both branch pipes – existing and additional ones are made so, that one of them can be inserted into the other, thus forming coaxial joint of pipe sections, annular gaps between them in this joint are sealed by one or several annular seals. At other end of additional branch pipe device for connection with drilling fluid supply line is installed. Wall of one part of additional L-shaped branch pipe is parallel to generatrix of cylindrical surface of continuous flushing adapter and is attached to it in one or several points.

EFFECT: providing required strength of device during its operation.

1 cl, 5 dwg