| 摘要 |
<p>There is disclosed a method of operating a multimode downhole tool, having a longitudinal bore extending therethrough. The method comprises running the tool into a well bore on a pipe string; changing the tool between operating modes comprising a formation tester mode and a circulation mode through sequential changes of pressure in the well bore; and opening and closing a bore closure valve disposed in the bore of the tool a plurality of times while the tool is in the formation tester mode responsive to sequential changes in well bore pressure without changing the tool to a different operating mode.</p> |
