Sub surface safety valve block, particularly suitable for...

Details Sub surface safety valve block, particularly suitable for... Sub surface safety valve block, particularly suitable for...

E - Fixed Constructions

21

B

166/51

E21B 33/035 (2006.01) E21B 33/038 (2006.01) E21B 34/04 (2006.01)

Patent

CA 1297786

1. CASE 2818 "SUB SURFACE SAFETY VALVE BLOCK, PARTICULARLY SUITABLE FOR THE RISERS OF OFFSHORE PLATFORMS" Abstract Sub-surface safety valve block to be connected between a well head at sea bottom, and the lower end of a riser, in order to make it possible the production tube and/or the service tube of the completion string to be closed by means of gate valves, which sub-surface safety valve block is constituted by a valve body provided with a vertical through-bore which is tigthly closed at its upper end by a packer with which the upper portion of the completion string is connected, and at the bottom is tightly closed by a tubing hanger with which the lower portion of said completion string is connected; said packer and said tubing hanger are fastened inside the above-said through-bore by means of a mechanical hooking which can be disengaged by means of a hydraulic- controlled action, and are each provided with a through- channel in order to connect the respective production tubes with the central region of said through-bore, which can be closed by means of a gate valve, as well as with two branched channels in order to connect the relevant service tube and the relevant hydraulic-drive lines used in order to drive the SSSV safety valve, respectively 2. with a service channel and a control channel provided inside said valve body, with a further gate valve being provided in order to make it possible this latter service channel to be closed.

591816

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