Pump down cement retaining device
US7861781B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Dec 11, 2008 |
| Grant date | Jan 4, 2011 |
| Priority date | — |
| Expiry date | Feb 23, 2029 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B33/16
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A wall casing cement plug assembly includes a receptacle with an axial passage. The receptacle is pumped to a lower end of the casing string and locked in place. The receptacle has a casing seal that engages the string of casing and a retainer mechanism on its exterior that engages a profile in the string of casing. Cement is pumped through the receptacle by rupturing a blocking device in the axial passage of the receptacle. A wiper plug is pumped down the string casing. The wiper plug has a prong on its lower end that stabs into the axial passage of the receptacle. A latch located in the lower portion of the receptacle locks the wiper plug to the body.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.