Method of and apparatus for installing the casing in a well
US5918677A · kind A · utility
Inventor
Key dates
| Filing date | Mar 12, 1997 |
| Grant date | Jul 6, 1999 |
| Priority date | — |
| Expiry date | Mar 12, 2017 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B43/10
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A method of providing a casing in well from a series of casing sections. The first section is provided from the top of the well and the subsequent sections are arranged progressively downwards therefrom. The subsequent section to be fitted is lowered into the well by a suitable lowering tool, such as a coiled tubing runner. The well fluids which are displaced by the lowering of the subsequent section and the lowering tool, passes from the lower portion of the well up through the internal bore of the section to be fitted. The displaced fluids pass out from the internal bore of the lowering tool into an outside annulus between the lowering tool and existing casing through radial closable openings or side valves. A lockable nonreturn valve is provided at the lower end of the section to be fitted and normally permits flow downwardly out of the casing and prevents flow upwardly into the casing but which may be optionally arranged in a locked open position to permit the well fluids to flow inside the internal bore of the section to be fitted.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.