Patent ID: 6467544
Filing Date: 2002-10-22
Classification: E21B

Abstract:
A sample module for use in a tool adapted for insertion into a subsurface wellbore for obtaining fluid samples therefrom, said sample module comprising:a sample chamber for receiving and storing pressurized fluid; a piston slidably disposed in said chamber to define a sample cavity and a buffer cavity, the cavities having variable volumes determined by movement of said piston; a first flowline for communicating fluid obtained from a subsurface formation through the sample module; a second flowline connecting said first flowline to the sample cavity; a third flowline connecting the sample cavity to one of said first flowline and an outlet port; a first valve disposed in said second flowline for controlling the flow of fluid from said first flowline to the sample cavity; and a second valve disposed in said third flowline for controlling the flow of fluid out of the sample cavity, whereby any fluid preloaded in the sample cavity may be flushed therefrom using the formation fluid in said first flowline and said first and second valves.