Perm Journal of Petroleum and Mining Engineering

Today, despite the relatively high accuracy of preparing geological structures for deep drilling in the Perm Krai using 3D seismic, there is a discrepancy between the geological and morphological characteristics of structures before drilling and according to drilling results, which makes it necessary to develop a geological and statistical approach that makes it possible to more accurately assess the risks of non-confirmation of the geological and morphological characteristics of structures prepared for deep drilling, as well as to determine the priority of objects for further geological exploration work. This work describes one of the options for developing a geological and statistical approach for rank differentiation of 25 structures of the IIК seismic reflector and 21 structures of the IIП seismic reflector, prepared by 3D seismic exploration. These structures has been already drilled by prospecting and appraisal wells within the Bashkir arch (Perm Krai). The initial data for the analysis were from the passport of structures prepared for deep drilling: the amplitude of the structure, the structure area according to the corresponding reflecting horizon, the ratio of the structure length to its width, the angle between the long axis of the structure and the axis of the nearest tectonic second order element, the distance from the structure to the edge of the nearest second order tectonic element and the distance from the structure to the center of the nearest second order tectonic element. For each model, the nature and degree of influence of the studied indicators on the confirmability of the amplitude by drilling was determined and described. The assessment of differentiation of structures by class and the accuracy of determining class boundaries were confirmed when classifying the structures of the test sample using discriminant analysis. This geological and statistical approach can be used for a more accurate assessment of the risks associated with the problem of the unconfirmability of the geological and morphological characteristics of structures prepared for deep drilling, as well as for identifying priority objects for geological exploration work, regardless of their geographical location and belonging to tectonic elements.

To improve the reliability and durability of oil and gas equipment, it is promising to use micro- and nanostructured metals and alloys, as well as metal-matrix composites. Conventional and nanostructured samples of aluminum, copper, BrA9ZhZL bronze, AMg6 alloy, and alumina-matrix dispersion-reinforced composite containing 6.3 wt % titanium were studied. Structuring treatment of metal materials was carried out in the liquid phase. The aluminum matrix composite was synthesized by powder metallurgy. A model electrolyte solution without forced circulation containing 30 g/L NaCl and an addition of acetic acid to pH = 4.0 was used as a corrosive medium. The test base was 144 h, the temperature was +22 °C, the volume of the solution in the cell with three samples was 500 ml. The relative calculated error of the tests was 5%. For all the studied samples, a continuous uniform distribution of corrosion damage to the metal surface is observed. At the same time, the corrosion rate (P, mm/year) of nanostructured samples of metals and alloys is approximately 11 % less than the corrosion rate of samples of the same metals and alloys that were not subjected to structuring treatment. For the aluminum matrix composite, it was noted that the dispersed reinforcement of aluminum with titanium provides an increase in the corrosion resistance of the matrix metal by 9.6 %. The results of the studies performed indicate an increased corrosion resistance of nanostructured metallic materials and an aluminum matrix composite, which is important when they are used as part of equipment operating in a corrosive environment.