| 摘要 |
A downhole steering system comprises a first full gauge stabiliser 34, a bias unit 28, a universal joint 26, and a second full gauge stabiliser 22, the bias unit 28 and universal joint 26 being located between the first and second full gauge stabilisers 34, 22. Conveniently, the system further comprises a drill bit and a fluid powered downhole motor 14, the motor being located, at least partially, between the drill bit 10 and the second stabiliser 22.
|
