Method and apparatus to reduce downhole surge pressure using hydrostatic valve
US6834726B2 · kind B2 · utility
48Cited by
30References
12Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | May 29, 2002 |
| Grant date | Dec 28, 2004 |
| Priority date | — |
| Expiry date | Jun 29, 2022 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B34/14
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
An apparatus for reducing pressure surges in a wellbore comprising a body having a bore therethrough, the bore providing a fluid path for wellbore fluid between a first and second end of the body, at least one fluid path permitting the wellbore fluid to pass between the bore and an annular area formed between an outer surface of the body and the walls of a wellbore therearound, and a number of closure mechanisms whereby the at least one fluid path is selectively closable to the flow of fluid.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.