Patent ID: 6662645
Filing Date: 2003-12-16
Classification: E21B

Abstract:
An apparatus for measuring the deployment forces acting on a well logging instrument string, comprising:a load rod adapted to be connected between a deployment system and the well logging instrument string, said load rod transferring the deployment forces between the deployment system and the logging instrument string; a strain gage system disposed on the load rod for indicating the deployment forces on the instrument string; a housing adapted to fit sealably over the load rod, said housing providing a pressure sealed, gas filled, cavity surrounding the load rod; and a pressure balancing system for essentially eliminating the effects of downhole pressure on the load rod, the pressure balancing system comprising a first sealing diameter, a second sealing diameter, and a third sealing diameter, said diameters selected such that the sealing area defined by the first sealing diameter is equal to the difference in the areas defined by the second sealing diameter and the third sealing diameter.