Apparatus for flotation completion for highly deviated wells
Abstract
Abstract WELL COMPLETION APPARATUS FOR HIGHLY DEVIATED WELLS. CEMENT SLURRY IS PLACED IN THE BORE HOLE BEFORE THE CASSING STRING IS RUN. THE CEMENT IS A DELAYED SETTING TYPE CEMENT. THE CASING CONTAINS FLUID HAVING A SUBSTANTIALLY LOWER DENSITY THAN THAT OF THE SLURRY. THE FLUID IS THE CASING PROVIDES A BOUYANCY EFFECT ON THE CASING FOR FLOATING THE CASING THROUGH THE DEVIATED ZONE. IN A MODIFIED FORM OF THE INVENTION, A BOUYANCY CHAMBER IS PROVIDED ADJACENT THE LOWER END OF THE STRING IN WHICH THE BOUYANCY FLUID IS CONTAINED. CENTRALIZERS ARE PROVIDED ON THE EXTERIOR OF THE CASING AND ARE SPACED LONGITUDINALLY FROM EACH OTHER. THE CENTRALIZERS ALONG THE BOUYANCY CHAMBER ARE SPACED APART AT GREATER INTERVALS THAN THE CENTRALIZERS ABOVE THE BOUYANCY CHAMBER. AN IMPROVED CASING-CEMENT BOND IS ACHIEVED DUE TO A PRESSURE DIFFERENTIAL BETWEEN THE EXTERIOR AND THE INTERIOR OF THE CASING WHEN THE CASING IS RUN IN THE CEMENT SLURRY. THE HYDROSTATIC PRESSURE OF THE CEMENT HARDENS, THE PRESSURE IN THE CASING INCREASES, THEREBY URGING THE CASING OUTWARDLY AGAINST THE HARDENED CEMENT.
Inventors
- 👤 Burton W Aulick
Bibliographic Details
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| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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