Patent ID: 7428925
Filing Date: 2008-09-30
Classification: E21B

Abstract:
1. A formation evaluation tool positionable in a wellbore penetrating a subterranean formation, comprising: a cooling system adapted to pass a cooling fluid through electronics disposed in at least one container in the formation evaluation tool whereby heat is dissipated therefrom, the electronics comprising at least one gauge; a fluid communication device having an inlet adapted to receive the formation fluid; a flowline operative connected to the fluid communication device and the at least one gauge for placing the formation fluid in fluid communication therewith whereby properties of the formation fluid are determined; at least one sample chamber operatively connected to the flowline; and a pressure compensator operatively connected to the at least one sample chamber and in fluid communication with the wellbore for balancing a pressure therein with a pressure in the sample chamber; wherein the pressure compensator comprises a chamber having a movable piston and a stationary piston therein, the movable piston slidably movable therein and defining a first variable cavity and a second variable cavity, the stationary piston separating the second variable cavity from a third variable cavity.