Protective sheath for high temperature process wells
US4421169A · kind A · utility
115Cited by
9References
10Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Dec 3, 1981 |
| Grant date | Dec 20, 1983 |
| Priority date | — |
| Expiry date | Dec 3, 2001 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B43/103
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
Apparatus and method for maintaining the integrity of a cement sheath surrounding a casing in a hot subteranean zone including a layer of compressible refractory insulation surrounding the casing and at least one cement hanger slidably carried by said casing and means for limiting the movement of the hanger on the casing. The insulation layer mechanically isolates the sheath from thermal expansion of the casing and the slidable cement hanger likewise allows limited axial motion of the casing relative to the sheath without inducing tensile loads.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.