Creating zonal isolation between the interior and exterior of a

Details Creating zonal isolation between the interior and exterior of a Creating zonal isolation between the interior and exterior of a

1998-08-03

2000-06-06

Dang, Hoang

Wells

Processes

Placing or shifting well part

166 50, 166206, 166207, E21B 4310

Patent

active

060706716

ABSTRACT:
A method is provided for creating zonal isolation between the exterior and interior of an uncased section of an underground well system which is located adjacent to a well section in which a well casing is present. The method includes inserting an expandable tubular through the existing well casing into an uncased section, such as a lateral branch, of the underground well system and subsequently expanding the expandable tubular such that the one end is pressed towards the wall of the uncased section of the well system and the outer surface of the other end is pressed against the inner surface of the well casing thereby creating an interference fit capable of achieving a shear bond and a hydraulic seal between the surrounding surfaces.

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Paul Metcalfe, "Expandable Slotted tubes Offer Well Design Benefits," Slimhole Technology, Hart's Petroleum Engineer International, Oct. 1996.

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