| 摘要 |
A logging tool, toolstring (10) or element (19) comprises a stabiliser including a pair of moveable, rigid, main stabiliser arms (23, 24) that each are pivotably secured adjacent to one another at one end to the logging tool or toolstring. As a result the arms (23, 24) are moveable between a relatively retracted position on the one hand and a relatively advanced position on the other in which the main stabiliser arms diverge from one another and protrude from the logging tool so as to present a pair of main arm free ends (29, 31) that are spaced from an outer surface of the tool and are engageable with a borehole surface. The logging tool (10) or element (19) includes a mechanism for effecting co-ordinated, powered, linked movement of the main stabiliser arms (23, 24) between the retracted and advanced positions. |
