Telescoping wiper plug
US7845401B2 · kind B2 · utility
1Cited by
14References
15Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Mar 27, 2008 |
| Grant date | Dec 7, 2010 |
| Priority date | — |
| Expiry date | Oct 27, 2028 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B33/165
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A wiper plug has a telescoping feature to allow it to be shorter while in a lubricator so as to reduce lubricator length as compared to an extended length for proper propulsion past off center openings such as side pocket mandrels in the string. The wiper has a telescoping feature that allows it to extend when dropping or being pumped from a lubricator. Once extended, it can lock in the extended position so that it doesn't collapse on the way down the string. Centralizers can optionally be used between an upper and a lower wiping section.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.