Inventors:
Reinhart Ciglenec - Katy TX, US
Paal Kibsgaard - Houston TX, US
Steven Villareal - Houston TX, US
International Classification:
E21B034/06
E21B043/00
Abstract:
A downhole fluid pump including a pump chamber, and a piston disposed in the pump chamber so that the piston will move in one selected from a charge stroke and a discharge stroke when the piston is exposed to a differential pressure. The downhole fluid pump may form part of a formation evaluation while drilling tool.