SAMPLER FOR FORMATION TESTER Russian patent published in 1995 - IPC

FIELD: well testing. SUBSTANCE: sampler for formation tester has pulse valve, and seats of sampling chamber and intake and discharge valves are made in form of cylindrical stages of large and small diameters. Made in sampling chamber above seats are upper and lower hydraulic cylinders with openings in their lower parts with inner diameter corresponding to large diameters of valves. Pulse is located in sampling chamber for interaction with upper face of upper hydraulic cylinder. Circular grooves of valves are made in form of trapeziums with small base being on valve surface. EFFECT: higher reliability of sampler operation due to prevention of valve sealing rings from washing out. 2 dwg