DEVICE FOR BOREHOLE TESTING Russian patent published in 1997 - IPC

FIELD: mining, in particular, borehole testing in the process of drilling. SUBSTANCE: device is equipped with a rod related to packer case through thrust bearing, and seat with return valve for circulating mud through sealing member. Well-bottom engine is volumetric, packer case and sealing member are installed on the shaft of the volumetric engine. Packer case is installed so as to be moved in axial direction, connected through pin connection to volumetric engine case. Volumetric engine shaft has annular partition and radial holes over the annular partition. The partition and shaft and packer case form hydraulic chamber. EFFECT: more intensive testing. 2 dwg