Sealing assembly UGHR is applied for protection of production string with nominal diameter
146, 168 and 178 mm from overpressure due to hydraulic fracturing.
The device is used in wells cased with liners diameter 102, 114 and 127 mm run in with hangers PHCZ, PHGMC or PHRC with drift pass inner diameter 89, 99 and 111 mm respectively.
Index “N” in UGRH titles is used to mark a device mounted at a liner hanger head. This
device has larger pass comparing to UGRH mounted at the bottom sub.
Hydraulic Fracturing Sealing Assembly UGRH has the following advantages:
• adjustable and easy to use design;
• installation of the device doesn’t require any operations with tubing and overpressure
at the wellhead;
• self-sealing elements of the sealing unit hold significant pressure differentials;
• large drift pass allows large-volume hydrofracturing performance and reduces abrasive
wear of inner parts surface.
The device consists of a hydraulic anchor, a sub with conical back nut, an extension pipe,
a sealing unit and a guide shoe.