E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
166/54
E21B 37/06 (2006.01)
Patent
CA 1190142
CHEMICAL INJECTION SYSTEM FOR OFFSHORE DRILLING RIGS ABSTRACT OF THE DISCLOSURE Conventionally, anti-freeze such as methanol, is injected through a chemical valve sub situated below the sea bed, with the chemical being pumped from the surface through a tube situated externally of the string. However, difficulty is encountered when passing through a blow-out preventer assembly particularly when associated with a slick joint and typically, internal and external bores and con- duits are used for this purpose with difficulties in effect- ing efficient seals engaging between the joints and bores together with the possibility of damage occurring to the external fluid conduit portions of the bypassing section. The present invention utilizes a pierced slick joint assem- bly whereby the fluid is conveyed from the upper end of the centralizer, through the slick joint and through the lower hanger all internally, thus eliminating any possibi- lities of the collapsing of conduits or other damage from occurring. Furthermore, double fail closed check valves may be incorporated adjacent the upper end of the slick joint assem- bly as well as in the chemical valve sub in order to prevent oil and/or gas from entering the chemical carrying conduits if excess pressure is encountered.
414410
Cooke James
Lemmey Robert
Rathie Lester C.
Ade & Company
Otis Engineering Corporation
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