FIELD: oil and gas industry.
SUBSTANCE: invention is related to well-flow cut-off systems and may be used for leak test of pipe strings. The device comprises a plug of removable material, which is set in the well pipe for the purpose of the above testing. At that pipe walls have channels (3, 4, 8), which ensure flowing connection between cavity (70) of the well over the plug and cavity (72) below the plug. At that the device comprises a cut-off element designed to ensure continuous closure of the flowing connection. The channel is formed preferably with axial cavity/chamber (4), wherein there is a piston designed to perform readjustment by axial movement from the first position with open flowing connection through the channel to the second position wherein the connection is closed permanently and may be open again.
EFFECT: improved efficiency of the well flow cut-off at leak testing of pipe strings.
10 cl, 5 dwg
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