Retrieval of bottom hole assembly during casing while drilling operations
US7708077B2 · kind B2 · utility
4Cited by
2References
19Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | May 22, 2008 |
| Grant date | May 4, 2010 |
| Priority date | — |
| Expiry date | May 22, 2028 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B10/265
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A bottom hole assembly in a casing-while-drilling operation is retrieved attaching a wireline to the bottom hole assembly. The density of the fluid in the casing string is lightened to a lesser density than the fluid in the annulus, thereby creating a pressure differential between fluid above the bottom hole assembly and fluid below the bottom hole assembly to exert an upward force on the bottom hole assembly. The operator pulls upward on the wireline to assist the upward force in moving the bottom hole assembly up the casing string.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.