No abstract

Drilling rigs belong to the lowest-safety level of hoisting rope systems. The valid regulation for drilling permits the usage of steel ropes on condition that their permanent safety does not decrease under the value 2.5. Considerable dynamic and cyclic stresses, abrasion and corrosive environment generated during the operation cause rapid fatigue and rope damage. The stress of the rope in operation leads to the specific precautions ensuring the safety rope work. The specific precautions include monitoring of the rope tractive work measured in tonne-kilometres (ton-kilometres services). The working part of the hoisting ropes of the drilling rigs - after the stated number of tonne kilometres was worked off - is slipped and a regular non-destructive rope test (NDT) is recommended. Rope under sizing, failing in rope slipping program and non- implementation of NDT controls led to the situations endangering the drilling crew safety. After the critical situations the operator decided to perform the analysis of the condition of all ropes.

The oil reservoir behavior and evaluation of its deliverability belongs to the fundamental role of production engineers in the petroleum industry. The ability of the well to produce is characterized by the relationship between the total liquid flow rate and bottom-hole flowing pressure. This relationship is so-called IPR – inflow performance relationship. Nowadays, there are many different IPR correlations in petroleum industry but the most common use model is Vogel‘s method. With the development of computer technology were created computer softwares for this purpose. In this article, Prosper 14.0 was used to compare the results obtained by manual calculation using the Vogel‘s method. At the same time, a manual calculation based on Darcy‘s reservoir model was created and compared with the software in which it was used as the main reservoir model.

Natural gas is currently one of the most important fossil fuels in the group of non-renewable energy sources, which is used very widely due to its properties. In order to be able to use it safely, it must be adjusted in accordance with the technical-delivery conditions before use. One of the basic quality parameters of natural gas is the water content, which is set at a maximum value of 110 mg per m3 of natural gas. For this reason, it is necessary to correctly determine the water content before the gas treatment, in order to choose the right dehydration technology. In this article, three methods were used to determine the water content of natural gas.