E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
166/25
E21B 49/10 (2006.01) E21B 43/27 (2006.01)
Patent
CA 1163917
DEVICE FOR TEMPORARILY CLOSING DUCT-FORMERS IN WELL COMPLETION APPARATUS ABSTRACT OF THE DISCLOSURE A duct-forming device is disclosed for use in a well completion apparatus of the kind, wherein a bore hole casing is positioned in a bore hole and duct-forming devices of alkali- and acid-resistant metal - such as steel - are secured at spaced levels to the casing in alignment with holes machined in the casing wall. In accordance with the invention, a closure device is arranged within the duct-forming device which permits flow of predetermined amounts of liquid, such as acid, from the interior of the casing through the duct-forming device and into the producing formation, while gradually being moved by the liquid into a position in which such fluid flow is prevented. After the fluid flow has been stopped by the closure device and when the formation pressure exceeds the pressure within the duct- forming device and the casing, fluid from the formation then forces the closure device toward and into the casing space to permit thereafter free flow of formation fluid into the duct- forming device and the casing or of pressurized treatment liquid from the casing into the formation.
378646
Marks & Clerk
Zanal Corporation Of Alberta Limited
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