Directional drilling pipelay
US4700788A · kind A · utility
14Cited by
21References
13Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | May 6, 1985 |
| Grant date | Oct 20, 1987 |
| Priority date | — |
| Expiry date | May 6, 2005 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B7/046
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A method and apparatus are provided for constructing a deep essentially horizontal borehole in the earth, as for the installation of a pipeline in Arctic offshore waters. This directional drilling technique eliminates exposure of an Arctic offshore pipeline to ice gouging and minimizes the hazards associated with unstable permafrost. Means are provided for gripping inside a borehole in order to apply thrust to a drill bit utilized to drill the borehole which is to contain the pipeline.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.