SCREENING DEVICE FOR WELL CEMENTING

摘要

FIELD: gas and oil production. ^ SUBSTANCE: device consists of spring leaf ferrule with inside positioned collar of elastic material and of clamping ring connected to said ferrule by welding on its internal surface. The said ferrule has a circular groove on internal surface. The collar is equipped with split leafs made solid with its circular section and with a sealing shoulder of a circular shape. The sealing shoulder is set in a gap formed with external surface of an upper part of the clamping ring and internal surface of the groove. ^ EFFECT: increased reliability of shut-down of cross section of well, including that one with complex profile, reduced weight and prime cost of manufacture of screening device, raised safety and performance of its installation. ^ 6 cl, 1 dwg