Most of the exploitable deposits of Oil and Gas Production Department Bystrinskneft, located in the Surgut region, are at a late stage of development. In this regard, most of the geological and technical activities are related to repair and insulation works. More than 800 well workover operations with the repair and insulation works are carried out annually on the well stock of Surgutneftegas OJSC. At the same time, every fourth well is being repaired by well workover crews of Bystrinskneft. Based on the experience, accumulated by Bystrinskneft, it is shown, that increasing the repair and insulation works efficiency requires an integrated approach. The main factors affecting the quality of work are given. Within the framework of the repair and insulation works development concept, five directions have been singled out. Organizational and technical measures, covering all production and organizational processes, have been developed. Organizational measures include professional development of specialists and provision of effective repair planning. Criteria are established for the necessity of repair and insulation works carrying out taking into account the technical state of the well, the economic feasibility and the terms of the license agreement. To optimize and simplify the choice of technologies and materials, selection algorithms have been developed for the cases of the need to eliminate the leaks in the production string and cross flows behind the casing. The main technological measures are considered
