Attachments for mitigating set cement downhole
AssigneeHalliburton Energy Services, Inc.
InventorsLonnie Helms, Venkata Gopala Rao Palla
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Abstract
A well tool attachment includes a tubular body with a bore therethrough extending along a longitudinal axis, wherein the tubular body is configured to seat in a shoe track of a well casing. A plurality of partitions are suspended from the tubular body, dividing the bore of the tubular body into a plurality of segments extending axially through the tubular body. The partitions are configured to break up cement slurry entering the bore of the tubular body into a plurality of cement segments to facilitate drilling after downhole cement sets.
Claims17
A well tool attachment for well casings comprising:
- a tubular body with a bore therethrough extending along a longitudinal axis, wherein the tubular body is configured to seat in a shoe track of a well casing;
- and
- a plurality of partitions suspended from the tubular body, dividing the bore of the tubular body into a plurality of segments extending axially through the tubular body, wherein the partitions are configured to break up cement slurry entering the bore of the tubular body into a plurality of cement segments to facilitate drilling after downhole cement sets wherein the plurality of partitions include a plurality of circumferential partitions extending circumferentially about the longitudinal axis, wherein the partitions include a plurality of radial partitions extending radially relative to the longitudinal axis, wherein the radial partitions each include a hydrophobic surface to prevent setting cement bonding to the radial partitions wherein the tubular body includes an inner surface, wherein the inner surface of the tubular body and the circumferential partitions each include a bonding surface configured to bond with setting cement to prevent set cement segments moving circumferentially during drilling to break up the cement segments.
7-10. (canceled)
A method of downhole cementing comprising:
- pumping cement downhole on a first side of a well casing until cement reaches a bottom end of the well casing and begins to return back uphole on a second side of the well casing;
- ceasing pumping cement downhole when an end of the cement flow enters an attachment seated in a shoe track of the well casing, wherein the attachment includes:
- a tubular body with a bore therethrough extending along a longitudinal axis, wherein the tubular body is configured to seat in the shoe track of the well casing;
- a plurality of partitions suspended from the tubular body, dividing the bore of the tubular body into a plurality of segments extending axially through the tubular body, wherein the partitions are configured to break up cement slurry entering the bore of the tubular body into a plurality of cement segments to facilitate drilling after downhole cement sets;
- setting the cement downhole, including setting segmented cement in the attachment;
- and
- breaking up the segmented cement in the attachment to drill further beyond the casing.
Dependencies are inferred from the claim text.