Most of the fields on Russian territory are characterized by falling production rates. That is why it is necessary to improve the technologies of service and production enhancement. A high priority has been given to coiled tubing technologies lately.

In Russia, coiled tubing (CT) is mostly used today for acid treatment of wells. During the process the coiled tubes are subjected to the impact of acid solutions making them rusty and thin. While they are reeled on a spool, the tubes suffer additional bend load. All of it brings about destruction of a CT and its further rupture. Part of the tube remains in the well and produces iron ions during further acid treatments and requires costly fishing operations.

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