| CPC E21B 33/05 (2013.01) [E21B 33/038 (2013.01); E21B 33/143 (2013.01); E21B 43/11 (2013.01)] | 50 Claims |
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1. A tool for cementing an annulus in a subsea oil or gas well, the tool comprising:
a safety module and a perforation and circulation module;
wherein the safety module provides fluid communication between an umbilical and the perforation and circulation module, and includes a mechanical lock formed and arranged to make a clamping engagement to an inside surface of a well head in use; and
wherein the perforation and circulation module is mounted below the safety module, and comprises:
i) upper and lower seals for sealing to the inner surface of a casing inside a wellbore;
ii) at least one upper perforating device, mounted between the upper and lower seals, for perforating casing;
iii) at least one lower perforating device, mounted below the lower seal, for perforating wellbore casing;
iv) a supply fluid flow path to supply fluid from the safety module through the upper and lower seals to below the perforation and circulation module;
v) a return fluid flow path from between the upper and lower seals to the safety module; and
vi) a diversion means in the supply fluid flow path, operable to redirect fluid supplied to the supply fluid flow path to a space defined between the upper and lower seals.
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