FIELD: oil extracting industry. SUBSTANCE: device has body, ring shaped knife fixed to the body, and suspension assembly. Body is made in form of circular plate having equal diameter with ring shaped knife and is connected to suspension assembly by means of traction bar connected to said assembly and the body by joints. In addition, a joint for connecting said plate to the body is placed on plate perimeter diameter, said diameter being perpendicular to plane in which ring shaped knife is located. EFFECT: increased effectiveness, low costs. 3 dwg
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