Application Type
Patent
Application SubType
PCT National Phase
(10) Registration Number and Date
BNN20190055 08.12.2021
Status
Registered
(180) Expiration Date
(20) Filing Number and Date
BN N/2019/0055 30.10.2017
(40) Publication Number and Date
BN N/2019/0055
A
08.12.2021
(86) PCT Filing Number and Date
(87) PCT Publication Number and Date
(85) National Entry Date
(30) Priority Details
EP 16196704.7
01.11.2016
(74) Representative Name
(54) Title
(EN) METHOD FOR SEALING CAVITIES IN OR ADJACENT TO A CURED CEMENT SHEATH SURROUNDING A WELL CASING
(57) Abstract
(EN)

A method for sealing cavities in or adjacent to a cured cement sheath (4) surrounding a well casing (3) of an underground wellbore comprises: - providing an expansion device (1) with edged expansion segments (2) that is configured to be moved with the expansion segments (2) in an unexpanded configuration up and down through the well casing (3); - moving the unexpanded expansion device (1) to a selected depth in the well casing (3); and - expanding the edged expansion segments (2) at the selected depth, thereby plastically expanding a selected casing section and pressing the expanded casing section into the surrounding cement sheath thereby sealing the cavities.

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(58) Citations
Document Type Date Action
Event NameDateStatus
Filing30.10.2017Filed
PCT National Phase Entry18.04.2019PCT National Phase
Registration08.12.2021Registered
Publication08.12.2021Published