Method of placing pipe into deviated boreholes
US4384616A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Nov 28, 1980 |
| Grant date | May 24, 1983 |
| Priority date | — |
| Expiry date | Nov 28, 2000 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B23/08
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A method of pushing pipe (e.g., casing) into a highly deviated borehole. The lower end of the pipe is plugged and the lower portion of the pipe string is filled with fluids (e.g., compressed gases, petroleum products, water, etc.) which have a lower density than that of the borehole fluid. This creates a buoyancy effect for the pipe in the deviated portion of the borehole which aids in keeping the pipe from contacting the lower side of the deviated hole. The pipe can be plugged or capped above the lightened section and filled with heavier fluid to aid in forcing the pipe downward into position. The plugs and caps are then removed, e.g., drilled out, when the pipe is ready for use. The fluids are thereby released into the mud slurry.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.