WELL DOWNHOLE SCREEN

摘要

The invention relates to oil-producing industry, in particular, to filtration devices preventing any mechanical impurities together with oil production arriving into a borehole operating oil deposits consisting of low-cemented collector rocks. The assigned task is characterised in that a well borehole screen, comprising a perforated tubular frame with longitudinal support rods, having coils of winding wire on the outer surface rigidly fixed in the bending spot, the wire ends being affixed to safety rings, a coupling at the upper end and a connecting thread at the lower end of the perforated tubular frame, a communication unit is mounted in the lower end of the perforated tubular frame via a connecting thread, the inner diameter of which equals the outer diameter of the tubular frame, and the outer diameter of the unit equals the outer diameter of the coupling, wherein the communication unit is made as a nipple and has through thread holes with plugs therein, each plug comprises a metal stopper from an active metal, breakable in a chemical action. The plug can contain a metal pipe from an unactive metal with a metal stopper from an active metal rigidly connected inside the pipe from the inner body side, wherein the inner space of the metal pipe is hollow. The length of the metal plug equals the thickness of the communication unit wall, and the length of the metal pipe is selected depending upon the diameter of an uncased borehole shaft and is less by 1-2 mm the distance to the uncased borehole shaft wall.