Patent ID: 9103186
Filing Date: 2015-08-11
Classification: E21B

Abstract:
1. A device, comprising: first and second sub ends having an extensible joint therebetween containing a latching mechanism that allows the joint to expand from a contracted position to an expanded position in response to a predetermined tensile force on the upper and lower sub ends; and a sealing chamber isolating the latching mechanism from well bore fluids, the sealing chamber defining a first volume that is exposed to well bore fluids and a second volume that is isolated from well bore fluids by a flexible barrier and is in fluid communication with an internal volume of the extensible joint; wherein the flexible barrier moves in response to well bore fluid pressure to alter the second volume to equalize pressure inside the internal volume of the extensible joint to the pressure of the well bore fluid; and wherein the flexible barrier moves in response to extension and contraction of the joint to alter the second volume to equalize pressure inside the internal volume of the extensible joint to the pressure of the well bore fluid.