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US 6,409,226 B1Granted
“Corrugated thick-walled pipe for use in wellbores”
AssigneeNoetic Engineering Inc.
InventorsMaurice William Slack, Trent Michael Victor Kaiser, Gerald Adrien Joseph Beaulac
Life of this patent
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Abstract
Thick-walled steel pipe is corrugated for the purpose of managing axial load when the pipe is used in an earth-restrained application. For example, the pipe may be used as casing in a cyclic steam stimulation well, where the axial loads are induced as the casing is heated and cooled.
Claims17
A string of joints of metal thick-walled pipe extending through and being restrained by earth material, the string being subject to change in axial load subsequent to installation, the string comprising:
- at least one such joint having a side wall which has been formed along at least part of its length into sinusoidal corrugations;
- the corrugated joint having a diameter to wall thickness ratio (D/t) less than 100;
- the corrugations having a corrugation radius of curvature to thickness ratio (R/t) less than 10;
- and
- the corrugations varying in wall thickness along their length, as a result of having been formed.
2 more elements
A joint of steel pipe having a longitudinal axis, comprising:
- a tubular body having a side wall,
- the body side wall having been formed along at least part of its length into sinusoidal corrugations;
- the side wall having a diameter to wall thickness ratio (D/t) less than 100;
- the corrugations having a corrugation radius of curvature to thickness ratio (R/t) less than 10;
- and
- the corrugations varying in wall thickness along their length, as a result of having been formed.
3 more elements
Dependencies are inferred from the claim text.