Inventors:
Reinhart Ciglenec - Katy TX, US
Steven G. Villareal - Houston TX, US
Albert Hoefel - Sugar Land TX, US
Peter Swinburne - Houston TX, US
Michael J. Stucker - Sugar Land TX, US
Jean-Marc Follini - Houston TX, US
Assignee:
Schlumberger Technology Corporation - Sugar Land TX
International Classification:
E21B 49/08, E21B 41/00, G05D 7/00
Abstract:
A downhole formation fluid pumping and a sampling apparatus are disclosed that may form part of a formation evaluation while drilling tool or part of a tool pipe string. The operation of the pump is optimized based upon parameters generated from formation pressure test data as well as tool system data thereby ensuring optimum performance of the pump at higher speeds and with greater dependability. New pump designs for fluid sampling apparatuses for use in MWD systems are also disclosed.