DEVICE TO DETERMINE FORMATION CHARACTERISTICS (VERSIONS) Russian patent published in 2010 - IPC E21B49/10 

FIELD: oil-and-gas industry.

SUBSTANCE: invention relates to underground formation analysis. Proposed device comprises instrument casing that can move inside wellbore extending into underground formation, probe housing carried by instrument casing and designed to isolate wellbore wall zone, actuating mechanism to move said probe unit between preset position whereat instrument casing moves and developed position intended for wellbore wall isolation. It comprises also perforator that passes through said probe unit to sink wellbore wall isolated zone section and pass through at least one of strengthened formations or casing strings, power source arranged in instrument casing and connected with perforator to control it. It uses also bypass line passing through instrument casing section and connected with at least one of the elements that follow, i.e. perforator, actuating mechanism, probe unit, and combination thereof to suck in brine fluid. It is connected also with pump arranged in instrument tool to suck in brine fluid into instrument casing through aforesaid bypass line.

EFFECT: higher accuracy.

18 cl, 24 dwg