The article discusses development of the backfill composition based on OTDV «Mikrodur». A method of mathematical planning of the experiment is described used to prove the optimal formulation of water isolation composition and the processing of the study results by application of the procedure of “full factorial experiment”. The results of the study by computer microtomography of the formed plugging stone are also presented.

This article object of study is a bottomhole zone of exploration wells or repaired wells with positive values of skin-factor. The skin-factor is usually determined at processing of data of hydrodynamic studies of wells under unsteady-state conditions by measuring the pressure build-up or pressure draw-down curves. To improve the skin-factor and wells productivity various methods of production stimulation are applied. At the skin-factors values from 0 to +3 it is recommended to stimulate the bottomhole zone by vibrowave methods using jet pumps, and at skin-factor values from +3 to +5 to perform the formation hydraulic fracturing.

The paper presents a method for arrangement the oil and gas wells overhaul repair with attraction of service companies and proves the effectiveness of the proposed scheme of jobs organization and gives a determination of well work-over services.

In this paper a method is presented for gas and gas condensate wells killing in the complicated conditions, that is in the conditions of abnormally low reservoir pressures and with presence of casing string leaks.

The paper reviews the new technologies developed for rehabilitation of wells being out of operating for a long time. It presents a complex of works needed for such wells brining back into operation