OAO NPF GEOFIZIKA OJSC EQUIPMENT AND TECHNOLOGY DEVELOPMENT TRENDS IN OIL-AND-GAS RESERVOIR HYDRODYNAMICAL SURVEYS WITH DRILLSTEM FORMATION TESTERS
History of the development of drillstem formation testing while drilling has been considered. Its advantages and disadvantages in comparison with its competing downhole surveys have been described. Up-to-date developments and promising engineering solutions and achievements meeting complicated geologic and technical conditions of drilling nowadays have been shown.