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US 5,085,277 AGranted
Sub-sea well injection system
AssigneeThe British Petroleum Company p.l.c.
InventorHans P. Hopper
Life of this patent
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AssigneeThe British Petroleum Company p.l.c.
InventorHans P. Hopper
Estimating the term…
A slurry of oil-impregnated cuttings from the use of oil based drilling mud and other unwanted slurries and fluids may be injected into the annulus of a sub-sea well and then into a porous formation through which the well has passed using apparatus on a guide base surrounding the sub-sea well head. The guide base comprises a coupling for a pipe extending down from the drilling rig, a one-way isolation valve and pipework leading to the outermost housing of the well. The outermost housing has ports to carry the slurry into the outermost annulus and inner housings may also have ports to carry this slurry into inner annuli. Inter housings also have a one-way check valve to control the injection. The guide base may have a cement circulation pipework and a cement and dump valve. The guide base may also be a retrievable base so that the injection apparatus may be reused.
Apparatus for injecting unwanted slurries or fluids resulting from drilling or other operations into an annulus of a sub-sea well, being surrounded by a drilling guide base positioned on an underwater surface and having an outer well head housing and casing, the pathway for the injection being through the guide base and outer housing without modification of the well head housing proper, said pathway comprising:
Dependencies are inferred from the claim text.