DEVICE FOR ELECTRICAL LOGGING THROUGH METAL COLUMN Russian patent published in 2014 - IPC G01V3/20 

FIELD: electricity.

SUBSTANCE: invention is meant for determination of electrical resistivity of rock formation by downhole multipole sonde through metal column. This device for logging includes superstructure and downhole device with multipole sonde designed as a group of five and more bundles of electrodes arranged in sequence and equispaced along well axis. Each bundle includes two and more power points arranged in plain perpendicular to well axis. In end bundles of electrodes groups (except for measuring M1 and M2) there arranged are current power points A1 and A2. All the other bundles of electrodes groups are only measuring ones. All the power points of the sonde have possibility to press to column wall using electric actuator with pressure mechanisms and to penetrate to the stem using built-in impact mechanism. Electronic unit of downhole instrument includes electrodes pressure quality control unit. Sonde measuring mode is point-to-point one.

EFFECT: increasing logging speed.

2 dwg