FIELD: oil production. SUBSTANCE: preventer and inlet section of lubricator with well instrumentation placed in it are installed on mouth valve. The instrumentation has cable portion connected to it. Preventer is closed after pressure between inlet section and well are levelled. Then pressure is blown off in the inlet section and the section is removed. Free end of the cable portion is connected to logging cable of elevator. Sealing fixture and guiding roll are installed on the preventer and then the instrumentation is descended down to the preset depth. EFFECT: more effective investigation of wells. 1 dwg
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