FIELD: oil and gas industry.
SUBSTANCE: device includes housing with central through channel tightly inserted and fixed in lower end of reamed string made in the form of metal connection pipe. The channel is equipped with hollow cylindrical insert with untight plug from above, inside of which ball valve is arranged with possibility of axial movement. Metal connection pipe is designed with possibility of rigid connection, for example by welding to reamed string. Plug is inserted into hollow cylindrical insert, which upper part is above the housing. Lower part arranged in the housing is provided with annular grooves from outside. Above the housing there is cylindrical platform installed, it seals the space between metal connection pipe and upper part of cylindrical insert. Housing external surface contacting to outside environment is covered with sealant.
EFFECT: improving reliability, simplifying the design and reducing the manufacturing costs.
1 dwg
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