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Oil prices have a decisive impact on the World?s economy. The cost of exploration and drilling of new oil fields is extremely high due to the fact that drilling works are more frequently performed in very difficult deposit conditions. On the other hand, a considerable number of already discovered and exploited fields entered a low production stage. This can be frequently helped with appropriate workover jobs in the well. For doing so, specialist workover fluids are injected to the wells. Most commonly these are in...

The construction of high-pressure gas pipelines is an extremely expensive and logistically difficult engineering project. The basic methods of building gas pipelines include laying them in an open excavation. However, this technology is very harmful to the natural environment and sometimes even impossible to apply. In such cases, the latest technological solutions should be used, i.e. trenchless technologies such as Horizontal Directional Drilling (HDD). The paper presents a method of evaluating the efficiency and...