System for running tubular members
US6491103B2 · kind B2 · utility
Assignees
Inventors
Key dates
| Filing date | Apr 9, 2001 |
| Grant date | Dec 10, 2002 |
| Priority date | — |
| Expiry date | Apr 18, 2021 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B33/165
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
The present invention relates to a wiper plug and internal drop ball mechanism that may be used in conjunction with a downhole surge reduction tool to run, hang, and cement casing liners in a wellbore. The apparatus of the present invention comprises a wiper plug assembly removably attached to the drill string within the casing liner, a drop ball sub attached below the wiper plug assembly which releases a float valve actuator ball having a diameter larger than the drill string, and float equipment having a plurality of flapper valves. The apparatus of the present invention may further comprise a diverter tool connected between the drill string and the casing liner.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.