Method of operating a multi-mode downhole tool

Details Method of operating a multi-mode downhole tool Method of operating a multi-mode downhole tool

E - Fixed Constructions

21

B

166/1

E21B 47/00 (2006.01) E21B 34/10 (2006.01) E21B 43/25 (2006.01) E21B 47/06 (2006.01) E21B 47/10 (2006.01) E21B 49/08 (2006.01)

Patent

CA 1228801

ABSTRACT There is disclosed a method of operating a multi- mode 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.

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