Drillable floating equipment and method of eliminating bit trips by using drillable materials for the construction of shoe tracks
US6513598B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 19, 2001 |
| Grant date | Feb 4, 2003 |
| Priority date | — |
| Expiry date | Mar 19, 2021 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B21/10
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A one trip method for drilling a wellbore below a cemented casing is disclosed. An apparatus for use in performing the method is also disclosed. The method comprises lowering a drill bit into a casing cemented in the wellbore. The casing has float equipment connected therein. The drill bit is rotated in the casing above the float equipment so that it expands radially outwardly to a diameter greater than the inner diameter of the casing.The float equipment, which can be a float shoe or a float collar or any other type of float equipment known in the art, includes an outer case with a valve connected therein. The outer case is comprised of a drillable material. Thus, the drill bit utilized to drill the wellbore can begin its drilling operation above the float equipment and successfully drill a wellbore below the casing having a diameter greater than the inner diameter of the casing.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.