FIELD: oil and gas production industry. SUBSTANCE: this relates to devices for protection of porous beds from infiltration of drilling mud by providing protective sedimentation layer in wall of bore-hole. Device has body, bush located in it, successively and coaxially installed grouting hydraulic giant head-piece and second hydraulic giant head-piece installed ahead of it. Installed ahead of grouting hydraulic giant head-piece is antiswirler with guiding vanes. Grouting hydraulic giant head-piece in its narrowing part has focusing surface in the form of single-hollow hyperboloid or hyperbolic paraboloid of rotation. Second hydraulic giant head-piece is of larger diameter as compared with diameter of grouting hydraulic giant head-piece. Grouting hydraulic giant head-piece, antiswirler with guiding blades, and second hydraulic giant head-piece are installed in bush. EFFECT: higher efficiency. 2 dwg
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