Patent ID: 6374669
Filing Date: 2002-04-23
Classification: E21B

Abstract:
A method for visually examining and video recording the sidewall of a selected interval of a borehole containing a wellbore fluid comprising the steps of:attaching a closed circuit video camera at the lower end of a wellbore Measurement Tool having a sensing means for acquiring a set of logging data, said Measurement Tool being suspended into the borehole via an electrical cable and being sized and adopted for passage therethru; attaching a light source on said tool adjacent to said video camera for illuminating a portion of the borehole being viewed by said video camera; displacing and replacing the wellbore fluid in said selected interval of a borehole with an injected transparent water mixture having a viscosifying agent and a coloring agent acting together in combination as injected to provide optimum contrast between the injected mixture and the wellbore fluid, and optionally injecting sufficient salt to increase the mixture density during said wellbore fluid displacing and replacing step; energizing said video camera and said light source to acquire a set of improved video images at said sidewall; lowering said measurement tool into said borehole by means of said cable and placing said measurement tool in said selected borehole interval; and coupling a video recorder to said video camera for recording the images formed by said camera and recording the logging data measured by said measurement tool as said tool is moved across said selected interval of the borehole.