| 摘要 |
<p>The invention is concerned with a tool and method for determining standoff from a formation though mud. The tool comprising a first electrode (90) located at a distance from the formation for measuring a first impedance. A second electrode (92) is located at a second distance from the formation for measuring a second impedance. A processing unit measures a difference between the first impedance and the second impedance, uses the difference to determine a conductivity of the mud and based thereon, determines the standoff of at least one of the first (90) and the second (92) electrode.</p> |
