Patent ID: 6148664
Filing Date: 2000-11-21
Classification: E21B

Abstract:
A method of conducting a drill stem test in a borehole, the drill stem having a drill bit, comprising the steps of:a) drilling with the drill stem in the borehole by rotating the drill stem, applying weight to the drill stem from the surface, and pumping drilling fluids down through the drill stem;b) ceasing rotation of the drill stem and the drill bit;c) maintaining the drill stem in the borehole;d) lowering a valve member from the surface inside of the drill stem, allowing the valve member to latch and seat in a valve seat so as to close off the drill stem and initiate the inflation of a packer, allowing the valve member to unlatch a piston in a fluid reservoir isolated from drilling fluid to the borehole; ande) forcing the piston to compress the fluid reservoir thereby inflating said packer with fluid from the fluid reservoir.