WELL FILTER Russian patent published in 2010 - IPC E21B43/11 E21B43/08 

FIELD: oil and gas production.

SUBSTANCE: well filter comprises case arranged in the form of pipe with circulating holes, case-mounted filtering element. Sealing caps with blind hole are installed on thread in circulating holes of case, which protrude inside case of filter by bottom part with the possibility to cut this part after assembly and to communicate internal space of case with external space, surrounding the filter. Cap is made of material capable of plastic deformation. Thread is arranged as conical. Length of bottom part is more than the difference between total length of cap and depth of blind hole. Maximum size of blind hole hexahedron is less than external diametre of sealing cap bottom part protruding inside the case. At the same time external diametre of bottom part protruding inside the case is less then internal diametre of conical thread hole arranged at inner side of case.

EFFECT: increased reliability of well filter operation due to rigid fixation of sealing caps in circulating holes.

7 cl, 4 dwg