Portable drill string compensator
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
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Nov 7, 2006
Issued Date -
N/A
app pub date -
Jul 15, 2005
filing date -
Dec 9, 2002
priority date (Note) -
In Force
status (Latency Note)
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Abstract
A closed system drill string compensator having a hydraulic fluid accumulator, at least one air pressure vessel, and a piston and a piston rod slidably engaged within a cylinder. The drill string compensator provides tensioning force for supporting a drill string and permits the drilling vessel to remain connected to the drill string during ocean level changes caused by wave action or ocean heave. In one embodiment, the accumulator surrounds the cylinder and at least one air pressure vessel is radially disposed around the accumulator and the cylinder. In another embodiment, the accumulator surrounds the cylinder and includes two ports, one port for permitting fluid communication between the cylinder and the accumulator and a second port for permitting fluid communication between the accumulator and the air pressure vessel, the first port including a shut-off valve disposed therein. Methods of compensating a drill string are also disclosed.
First Claim
Other Claims data not available
Family
| Country | kind | publication No. | Filing Date |
|---|---|---|---|
| US | B2 | US6968900 | Dec 09, 2002 |
| SG | A1 | SG115591 | Nov 19, 2003 |
| EP | B1 | EP1428973 | Nov 19, 2003 |
| NO | B1 | NO329534 | Nov 28, 2003 |
| BR | B1 | BRPI0307860 | Dec 01, 2003 |
International Classification(s)
- 2005 Application Filing Year
- E21B Class
- 1322 Applications Filed
- 932 Patents Issued To-Date
- 70.50 % Issued To-Date
Cited Art Landscape
Patent Citation Ranking
- 12 Citation Count
- E21B Class
- 51.87 % this patent is cited more than
- 19 Age
