FIELD: oil and gas production. SUBSTANCE: on reaching well bottom, electric current to motor drive is supplied over well-logging cable. As a result, load drops and actuates spring-loaded striker which destroys diaphragm, after which downhole fluid fills air chamber entraining sludge and various objects contained on bottom into collector chamber-trap. Leaf shutter opens and a part of sludge is aspirated into air chamber. When aspiration process is completed, hole in diaphragm is closed with striker propelled by spring thereby preventing loss of sludge when being withdrawn. EFFECT: enhanced efficiency and reliability of process. 1 dwg
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