Drilling and casing landing apparatus and method
US4133396A · kind A · utility
68Cited by
11References
27Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Nov 4, 1977 |
| Grant date | Jan 9, 1979 |
| Priority date | — |
| Expiry date | Nov 4, 1997 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B10/66
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
Casing is run into a well bore hole on a running pipe string. Fluid motor and drill apparatus is supported in the casing, with the drill extending below the lower end of the casing to drill the bore hole in advance of the casing. For subsea drilling operations, the casing is suspended from a riser housing which lands on a subsea base, and the running pipe is released from the riser housing to enable retrieval of the motor and drill assembly. Plural motors are employed for drilling large holes.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.