Leninogorskneft experience in mechanical prevention of downhole pumping equipment scaling

Authors: Yu.N. Legaev, I.S. Vanyurikhin, D.V. Pischaev, F.A. Galiev (Oil and Gas Production Department Leninogorskneft, RF, Leninogorsk), K.V. Valovsky, Dr.Sc. (TatNIPIneft, RF, Bugulma)

Key words: salts, scaling, ferrous sulphide, liner, choke.

One of the main wellbore problems in the Romashkinskoye field Deposits No. 301-303 is scaling of downhole pumping equipment. The operator has been successfully using liners made of scaled tubing that serve as scaling caltalysts. The effect can further be enhanced by chokes. This causes deposition of salts (scaling) on the liner itself, rather than on the downhole pumping equipment. For the recent 5 years, the number of workover operations dropped from 57 to 9.