Refrac liner with isolation collar
OwnerJustin Kellner, Stephen J. Chauffeinventors
Life of this patent
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Abstract
A collar for a refracturing liner includes a body having a first end and a second end, the first end being configured to connect to a first liner segment, and the second end being configured to connect to a second liner segment. The body defines an inner diameter surface extending between the first and second ends. The collar also includes at least one radial expansion feature formed in the body, wherein the at least one radial expansion feature is configured to deform radially outward when the body is axially compressed, and wherein the at least one radial expansion feature is configured to engage a surrounding tubular and form a fluid flow barrier therewith.
Claims20
A collar for a refracturing liner, comprising:
- a body having a first end and a second end, the first end being configured to connect to a first liner segment, and the second end being configured to connect to a second liner segment, wherein the body defines an inner diameter surface extending between the first and second ends;
- and
- at least one radial expansion feature formed in the body, wherein the at least one radial expansion feature is configured to deform radially outward when the body is axially compressed, and wherein the at least one radial expansion feature is configured to engage a surrounding tubular and form a fluid flow barrier therewith.
A method for refracturing a well, comprising:
- positioning a liner within a perforated casing of a well that extends through a formation, such that an annulus is formed between the liner and the perforated casing, wherein the liner comprises a plurality of liner segments connected together by a plurality of isolation collars;
- axially compressing the liner, wherein axially compressing the liner causes at least some of the plurality of isolation collars to deform radially outwards and at least partially block fluid flow in the annulus;
- perforating the liner so as to create new perforations axially between two of the plurality of isolation collars;
- and
- pumping fracturing fluid into the formation through the new perforations.
A refracturing system, comprising:
- a first liner segment;
- a second liner segment;
- and
- an isolation collar connecting together the first and second liner segments, wherein the isolation collar is configured to be deformed radially outward by pressing the first and second liner segments together, so as to form at least a partial barrier to fluid flow through an annulus formed between the first and second liner segments and a surrounding tubular.
Dependencies are inferred from the claim text.