Device for temporarily closing duct-formers in well completion apparatus
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. The inventive arrangement permits inter alia the establishment of a sufficient and substantially uniform feeding rate of treatment liquid, such as acid, from the casing into the producing formation through all the duct-formers in preparation for subsequent acidification or other treatments, such as sand fracking.
- Assignee:
- IFI; EDB-82-000395
- Patent Number(s):
- US 4285398
- OSTI ID:
- 6105899
- Resource Relation:
- Patent File Date: Filed date 19 Oct 1979
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
03 NATURAL GAS
WELL COMPLETION
CLOSURES
ALUMINIUM
ALUMINIUM ALLOYS
BOREHOLES
DUCTS
FLUID FLOW
IMPEDANCE
MAGNESIUM
MAGNESIUM ALLOYS
MATERIALS WORKING
WELL CASINGS
ZINC
ZINC ALLOYS
ALKALINE EARTH METALS
ALLOYS
CAVITIES
ELEMENTS
FABRICATION
METALS
020300* - Petroleum- Drilling & Production
030300 - Natural Gas- Drilling
Production
& Processing