BLOCK VALVE UNIT AND STATION Russian patent published in 2016 - IPC E21B29/08 

FIELD: oil and gas industry.

SUBSTANCE: invention is referred to block valves for underwater well-workover systems. The block valve station (100) is suggested for use in underwater well-workover systems comprising block valve unit (102). At that block valve unit (102) comprises cutting block valve unit (204) placed in the block valve cavity (206) so that cutting block valve unit (204) may perform reciprocal movement in the block valve cavity (206) between open and closed positions. At that reciprocal movement of cutting block valve unit (204) leads to cutting of the pipe string stalk passing through block valve station (100). Besides the block valve station (100) comprises additionally a pocket (202) formed in the block valve unit (102) close to its cavity (206). At that pocket (202) forms space, which may contain one or several pipe string stalks obtained in result of cutting operation. At that reciprocal movement of cutting block valve unit (204) transports one or several pipe string stalks to the pocket (202).

EFFECT: excluded damage of elements of the block valve unit in result of jamming at reciprocal movement as well as potential cutting of pipes with larger diameter.

17 cl, 5 dwg