Well apparatus

Details Well apparatus Well apparatus

E - Fixed Constructions

21

B

166/51

E21B 34/04 (2006.01) E21B 29/04 (2006.01) E21B 29/08 (2006.01) E21B 33/06 (2006.01) E21B 33/076 (2006.01) E21B 43/013 (2006.01)

Patent

CA 1274770

ABSTRACT OF THE DISCLOSURE Apparatus is disclosed for use in testing a forma- tion of and/or performing remedial work within a subsea well by means of a pipe string which is lowered through a conduc- tor depending from a drilling vessel at the water surface and releasably connected at its lower end to a blowout preventer stack mounted on the head of the well. The string is landed within the wellhead for depending from the wellhead into the well bore, and a so called subsea test tree connected as part of the pipe string has means therein adapted to open and close the string in response to the supply and exhaust of control fluid from a source at the surface t whereby the well may be controlled upon closing the string and raising of the upper end of the string above the tree and closing of the blowout preventer thereabove. A lubricator valve connected as part of the upper end of the string near its connection to the test tree has rams therein which not only permit the string to be opened and closed, but also enable the annular space about a line in the bore of the valve to be closed and/or the line to be sheared in the event of emergency conditions.

526194

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