Foil wrapped base pipe for sand control
Patent 5310000 Issued on May 10, 1994. Estimated Expiration Date: 
September 28, 2012. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
September 28, 2012. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 2436198 3602307 3726343 3913675 Method and apparatus for gravel packing wells Method and apparatus for gravel packing wells Acid soluble coating for well screens Acid soluble coating for well screens Method and apparatus for gravel packing a well Process for washing through filter media in a production zone with a pre-packed screen and coil tubing InventorsAssigneeApplicationNo. 952558 filed on 09/28/1992US Classes:166/296, Preventing flow into strainer while lowering by blocking openings166/56, SCREEN AND OUTSIDE CLEANING PIPE166/157, SCREEN WITH WASHING POINT OR SHOE166/205, SCREEN WITH VALVE, CLOSURE, CHANGEABLE RESTRICTOR OR PORTION REMOVABLE IN WELL166/228, Porous material166/300, Chemical inter-reaction of two or more introduced materials (e.g., selective plugging or surfactant)166/376Destroying or dissolving well partExaminersPrimary: Britts, Ramon S.Assistant: Schoeppel, Roger J. Attorney, Agent or FirmInternational ClassE21B 043/10AbstractThe flow apertures of a perforated mandrel are temporarily sealed by a foil covering sheet which is made of a sacrificial material, for example, zinc, aluminum and magnesium The sacrificial covering sheet prevents dirty completion fluid from passing through and in and out of the screen as it is run into the hole, thereby protecting the screen from plugging. During the time the screen mandrel is temporarily sealed by the sacrificial foil covering, cleaning fluid is circulated through the work string and is returned through the annulus between the screen and the open well bore for removing filter cake, drilling debris and lost circulation material. After the annulus has been cleaned, the annulus is filled with an acid solution or caustic solution, which dissolves the sacrificial foil and opens the base pipe perforations.Field of SearchSCREEN AND OUTSIDE CLEANING PIPESCREEN WITH WASHING POINT OR SHOE SCREEN WITH VALVE, CLOSURE, CHANGEABLE RESTRICTOR OR PORTION REMOVABLE IN WELL SCREENS Porous material With perforated pipe Preventing flow into strainer while lowering by blocking openings Chemical inter-reaction of two or more introduced materials (e.g., selective plugging or surfactant) Destroying or dissolving well part | |
