FIELD: oil and gas industry.
SUBSTANCE: invention refers to downhole analysis of underground bed. Specifically invention refers to sampling through perforations in well bore leading to the underground bed. Method and device for caving reduction in perforation formed in well bore and leading from well bore to underground bed are offered. The well bore contains the device body with the lever moving forward. The perforation contains one or more caving block units mounted by using the lever. Caving block unit is designed so that to prevent caving from base fluid to the body through perforation.
EFFECT: reduced contamination of base fluid.
31 cl, 20 dwg
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