More than 30% of well workover operations at Yambursky Field are done with the help of CT units (1 team working with М10 and 1 team with М20). The main types of service operations performed with CT units include:

• restoring artificial bottomhole by sand bridge removal with the help of М10;

• flow stimulation and restoring bottomhole after hydrofracturing (HF) with М20.

The artificial bottom-hole restoring technology envisages the following method. At first the technological liquid is produced on the basis of foamforming liquid (FFL). Calcium chloride (CaCl2) is added into the medium for augmenting the stability

of a foam system and reducing the congelation temperature. CM cellulose, neonol, water and methanol are added as well. 25 m3 of FFL is prepared for Cenomanian gas wells. A CT unit is set on the well mouth. The unit is connected with compression facility (СДА-5/220) and pump unit (ЦА-320) via T-branch in the form of an ejector. The connection necessarily includes a heat-exchanging apparatus.