Title:
ドリルストリング振動を減衰させるための方法及び装置
Document Type and Number:
Japanese Patent JP2010504453
Kind Code:
A
Abstract:
Apparatus and methods are described for highly attenuating vibrations of a drillstring assembly while drilling. In one embodiment, vibrations are attenuated by introducing one or more vibration attenuation modules at appropriate assembly locations. For example, vibration attenuation modules may be inserted at locations where vibration energy is expected to be maximal. In one embodiment the vibration attenuation modules include cavities loosely packed with particles of solid material such as sand or metallic powder. In one embodiment, the cavity walls are rough and/or include geometric features that enhance vibration energy transfer to the loosely packed particles in the cavity(ies). The vibration energy is dissipated via friction and inelastic particle-particle and particle-wall collisions that occur as a result of drillstring motion.
Inventors:
Jahi-le Alfonso Pavong
Joachim Zeiller
Demosenis George O. Paphitis
Shu Chauer-Gian
Joachim Zeiller
Demosenis George O. Paphitis
Shu Chauer-Gian
Application Number:
JP2009529294A
Publication Date:
February 12, 2010
Filing Date:
August 30, 2007
Export Citation:
Assignee:
SCHLUMBERGER HOLDINGS LIMITED
International Classes:
E21B17/00; E21B43/00
Domestic Patent References:
| JPS58146692A | 1983-09-01 | |||
| JPH08219377A | 1996-08-30 | |||
| JPS4214863Y1 | 1967-08-24 |
Foreign References:
| US6364039B1 | 2002-04-02 | |||
| US4522271A | 1985-06-11 |
Attorney, Agent or Firm:
Takuji Yamada
Mitsuo Tanaka
Mitsuo Tanaka