FIBER OPTIC DEVICE FOR TEMPERATURE MONITORING IN A HORIZONTAL WELL Russian patent published in 2023 - IPC E21B23/14 G02B6/50 E21B47/06 

FIELD: oil and gas.

SUBSTANCE: fibre-optic device for temperature monitoring in a well with horizontal completion is claimed. The optical fibre device comprises the first tubing 1. It also comprises a resonant centralizer and a branch pipe. It also comprises the second tubing-2 and the ESP electric centrifugal pump. It also comprises the tubing-3 and a Y-shaped circulation sub. It also comprises the perforated tubing and a container with a pressure and temperature sensor. The above elements are connected in series from top to bottom. The device also comprises a pump centralizer installed at the base of the ESP, a FOC fibre optic cable in a sealed protective casing. The casing is filled with the inert gas argon. The lower end of the casing is connected by welding to the optical fibre of the pressure and temperature sensor. The lower part of the FOC is placed inside the perforated tubing. The upper part of the FOC leaving the Y-shaped circulation sub is located along the outer walls of the tubing-3, tubing-2 and tubing-1 directed upwards, by sequentially securing with protectors along the entire length of the ESP. The upper part of the FOC is placed in the longitudinal grooves of the pump centralizer and placed in the grooves of the resonant centralizer, and fastened to the tubing-1 with the help of protectors installed on the tubing-1 couplings, for connection with ground equipment through a cable gland. The resonant centralizer comprises a cone-shaped body with a central channel, with upper and lower connecting threads. The body surface has the form of protrusions and depressions oriented perpendicular to the axis of the resonant centralizer. On the protrusions, grooves are made, which are located evenly around the body through an angle equal to 60 degrees. The second tubing-2 has a smaller diameter than the first tubing-1.

EFFECT: increased reliability of the dried device and long-term operation of the fibre -optic cable.

1 cl, 4 dwg