DEVICE FOR SEALING FLEXIBLE DRAWBAR Russian patent published in 2008 - IPC F16J15/46 

FIELD: mechanics.

SUBSTANCE: invention relates to sealing movable devices in processes involving using cable containers and can be used to seal a moving cable at wellheads on lifting liquid there from by means of swabs. The said device incorporates a casing with an attachment unit, a main and additional sealers furnished with retrievable sealing elements, a main and additional hydraulic mechanisms tightening sealing elements to the drawbar, the said mechanisms being connected to the appropriate main and additional speeders. The casing space with a drain channel is arranged between sealers. The main and additional speeders are controlled by pressure fed from outside. The casing outside accommodates a vessel to gather and remove liquid, the vessel communicating, via a drain valve, with the casing space and wellhead via the valve opening on pulling the cable down into the well. The vessel volume should be no less than that of the liquid leaking into the casing space on lifting the cable from the well. An air valve can be arranged above the vessel valve to prevent and ingress of air into the well.

EFFECT: reliable isolation of movable flexible means with a complicated outer surface being isolated, minimum possible wear out of sealing elements.

2 cl, 2 dwg