WELL SCREEN AND ITS ASSEMBLING PROCESS Russian patent published in 2008 - IPC E21B43/08 

FIELD: oil and gas industry.

SUBSTANCE: invention is referred to an oil-and-gas industry. The well screen contains drainage and filtering grids, the defensive perforated housing, installed concentric on a tube. On a side surface of a tube in openings was pressure-tight sheared off stoppers are installed. Stoppers are realised hollow with a step opening and a thrust shoulder on the one hand and a bottom with another. Transferring from an opening with lager diameter, which has been placed more close to a thrust shoulder, to smaller one that placed more close to bottom of the stopper and it is executed in the form of a cone. During screen assembly each stopper is installed in an opening executed in a tube. Further the rod which diameter corresponds to lager diameter of the stopper opening is put into the stopper. A rod is affected by a percussion instrument, thus the rod reaches against the stop in the stopper bottom. External diameter of the stopper is augmented and the stopper is fixed in an opening. After shock the rod is extracted. Technical result is increase of reliability of hermetic sealing of sheared off stoppers, reduction of labour input at its installation, one valued axled attitude of stoppers in certain position for their guaranteed shear at screen input in operation, screen cost reduction.

EFFECT: increase of reliability of hermetic sealing of sheared off stoppers, reduction of labour input at its installation; screen cost reduction.

12 cl, 8 dwg