| 发明名称 |
Drillstring |
| 摘要 |
A drillstring comprising a length of drillpipes and a bottomhole assembly disposed at a downhole end of the length of drillpipes. The bottomhole assembly comprises a transition section proximal to the end of the length of drillpipes to reduce vibration of the bottomhole assembly during drilling. The transition section varies gradually in acoustic impedance between the acoustic impedance of the drillstring above the transition section and the acoustic impedance of the bottomhole assembly below the transition section. The transition section forms at least thirty percent (30%) of the total length of the bottomhole assembly. |
| 申请公布号 |
US2016290065(A1) |
申请公布日期 |
2016.10.06 |
| 申请号 |
US201415038002 |
申请日期 |
2014.11.20 |
| 申请人 |
SCHLUMBERGER TECHNOLOGY CORPORATION |
发明人 |
Jeffryes Benjamin P. |
| 分类号 |
E21B17/07;G01V11/00 |
主分类号 |
E21B17/07 |
| 代理机构 |
|
代理人 |
|
| 主权项 |
1. A drillstring for drilling a borehole through an earth formation, comprising:
a length of drillpipes; and a bottomhole assembly disposed at a downhole end of the length of drillpipes; wherein:
the bottomhole assembly comprises a transition section proximal to the downhole end of the length of drillpipes;transition section is configured in use to reduce vibration of the bottomhole assembly during drilling;the transition section varies gradually in acoustic impedance between the acoustic impedance of the drillstring above the transition section and the acoustic impedance of the bottomhole assembly below the transition section; andthe transition section comprises at least 30% of a total length of the bottomhole assembly. |
| 地址 |
Sugar Land TX US |
