ANTI-FLIGHT DEVICE FOR PREVENTION OF DOWNHOLE RESISTIVE HEATER FALLING WITH TERMINAL SLEEVE Russian patent published in 2024 - IPC E21B23/02 E21B40/00 E21B31/00 

FIELD: mining.

SUBSTANCE: invention relates to an anti-flight device for preventing the fall of a borehole resistive heater with a terminal sleeve. Device includes a housing consisting of a base made in the form of a collet with lugs, and a clamping nut, having a taper with the possibility of fixing the tubing anchor on the terminal sleeve when the clamping nut is screwed onto the base. In the base there is a blind hole for installation and attachment of the terminal sleeve of the borehole resistive heater. Blind hole in the base has a diameter that provides the connection of the base and the terminal sleeve of the well resistive heater with guaranteed interference, at which the values of the pair of diameters of the blind hole of the base and said terminal sleeve correspond to interference fits. Outer surface of the base has a thread. On the outer surface of the housing there are longitudinal recesses. In case of downhole resistive heater falling in well, tubing anchor is made with possibility of fixation in anchor ring of Rudak. Outer diameter of the base is larger than or equal to the inner diameter of the hole in the anchor ring of Rudak installed in the well below the tubing anchor.

EFFECT: increased technological capabilities of the device associated with prevention of the borehole resistive heater passage through the hole of the Rudak ring to the borehole pumps, and creation of a simple design of the anti-flight device, which allows to preserve operability of the tubing string in case of the downhole resistive heater falling.

2 cl, 2 dwg