Patent ID: 7568521

Claim:
A formation evaluation tool positionable in a wellbore penetrating a subterranean formation, comprising: an electronics module comprising: a first cooler comprising: a cylinder filled with a pressurized working gas; a magnetically driven piston positioned in the cylinder; a gas driven piston positioned in the cylinder such that reciprocation of the magnetically driven piston causes reciprocation of the gas driven cylinder; and a first magnet coupled to the gas driven piston; and a second cooler comprising: a cooling flow line extending through electronics and forming a closed loop with a pump chamber; an electronics piston positioned in the pump chamber; and a second magnet coupled to the electronics piston within the pump chamber such that the second magnet and the electronics piston reciprocate within the pump chamber in response to reciprocation of the first magnet coupled to the gas driven piston of the first cooler, thereby pumping cooling fluid within the cooling flow line.