FIELD: oil and gas industry.
SUBSTANCE: group of inventions relates to the oil and gas production industry, in particular, to provision of continuous circulation of drilling mud during well drilling. A housing (2) of the circulation device (1) is provided with a central channel (4) designed to receive a portion of a pipe (38); a central channel (4) comprises the upper and lower sealing elements (30, 32); the sealing elements (30, 32) are provided with central holes (33) which, when said sealing elements are expanded (30, 32), can close or be in tight contact with the pipe (38) with inner sealing surface (34) pipe (38). Each of the sealing elements (30, 32) hermetically connected to a packer pipe (8) which is located in the housing (2) for rotation about the central axis (6) of the central channel (4) and is surrounded by a sealing unit (18, 20) closely fitted between the periphery of the packer pipe (8) and the housing (2).
EFFECT: simplified process to provide continuous circulation of drilling mud.
10 cl, 4 dwg
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