Apparatus and method for inserting and retrieving a tool string through well surface equipment
US6719061B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 7, 2002 |
| Grant date | Apr 13, 2004 |
| Priority date | — |
| Expiry date | Jul 14, 2022 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B33/068
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
Well surface equipment is provided to seal around the outer surface of portions of tool sections as the tool sections are assembled or disconnected in a portion of the well surface equipment. The portion of the well surface equipment is isolated from wellhead pressure to enhance well operator control during assembly or disassembly of a tool string. Also, if a fluid path is opened up due to activation of the tool string (such as initiation of a detonating cord that is placed in the fluid path), a barrier mechanism is actuated to block fluid communication through this fluid path so that a portion of the well surface equipment can remain isolated from wellhead pressure to enable convenient retrieval and disconnection of tool sections.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.