Calculations of thermodynamic conditions of the hydrate formation based on the composition of the Yakutia gas field have shown the possibility of hydrate formation in all fields of the LenaTungusskaya petroleum province. For deposits of the Leno- Vilyui petroleum province it is possible only a technogenic hydrate formation. It is established that the natural gas of all Yakutia deposits form hydrates of the cubic structure II, and the hydrates are mainly enriched in propane, isobutane and n-butane.

Keywords: gas hydrates, natural gas of Yakutiya fields, thermodynamic conditions of hydrating, reservoir conditions, hydrate composition and structure.

Conducted paleotectonic, paleogeographical and geochemical studies indicated that PaleoceneLower Miocene sediments in the Yevlakh-Aghjabedi Trough were accumulated under relatively restricted marine conditions that favored organic matter accumulation and preservation. Major source interval is composed of argillaceous sediments of Oligocene age Lower Maykop Formation and partly of terrigenous-tuffaceous rocks of the Eocene. Sufficient geothermal conditions for organic matter to hydrocarbons conversion have been present for sediments buried deeper than 3.5 km. According to studies shale gas prospectivity in Yevlakh-Aghjabedi trough is beleived to be related to the central part of the basin where Maykop strata are more deeply subsided than elsewhere. In this area shaly layers of Maykop deposits are interbedded with low permeability, less than 20 sm thick, aleurolitic layers considered as a feature to favor development of possible hydrocarbon accumulations.

Keywords: geology, tectonics, paleotectonics, paleogeography, lithology, lithofacies, stratigraphy, structure, paleostructure, upheaving, region, sedimentation, deposits, hydrocarbons, trap, organic matter,  oil-and-gas-bearing capacity, clay, shale, clay shale, prospectivity, the Paleogene-Miocene, Maikop.

The work is focused on identification changes in formation oil viscosity as part of the pilot studies on fluid transition between the single-phase state and two-phase liquid state, and obtaining data on saturation pressure (P_sat.) when addition of «Karpatol» into crude oil.

Keywords: saturation pressure, formation oil viscosity, thermophysical properties, phase equilibrium, filtration properties.

In view of the special physical properties of CO₂, Span-Wagner equation of state has been adopted to formulate a numerical procedure to model non-isothermal flow while injecting CO₂, calculated by iterative coupling with CO₂ physical parameter and pressure as well as heat. Compared with well site data of Well Cao 8 in «Subei» Oilfield, the error of predicted temperatures is within 1%, and the maximum error of pressures is less than 1.6%, the example shows that the developed procedure can offer accurate predictions. Moreover, the sensitivity analysis can be done through the research of influencing factors on the bottomhole pressure and temperature produced by injection temperature, injection pressure, injection rate and time, etc. The results obtained illustrate the significance for enhancing injection efficiency.

Key words: CO₂ injection, equation of state, influencing factors analysis, bottom-hole pressure, bottom-hole temperature

At present, liquid nitrogen is regarded as an excellent substitute for water-based fracturing fluid. In order to analyze the effect of liquid nitrogen cooling on rock cracking, the acoustic and permeability tests were performed on the same shale sample before and after liquid nitrogen cooling. The results indicated that liquid nitrogen cooling could not only induce thermal cracks on the surface of samples but also lead to the growth of micro-cracks. After liquid nitrogen cooling, the acoustic wave velocity of shale sample decreased by 2.69%-3.53%. Meanwhile, the permeability presented an 11.55%-177.27% increase. The advantages, technical difficulties and application prospect were also discussed in the paper.

Keywords: waterless fracturing, liquid nitrogen, shale gas, prospect.

A comparative analysis of swelling packers worked out and applied in developed countries, as well as a classification of packers is provided in the article. Scope of swelling packers, development phases, properties of elastomers used as a sealing element in said packers are also highlighted. Protective non-extrusion rings that protect a seal against extrusion of the elastomer are described here, thickness of the sealing element is provided. A variety of swelling packers, systems, regulating swelling process are specified showing advantages and shortages of swelling packers.

Keywords: swelling packer, sealing element, elastomer, protective anti-extrusion rings, well watering, mechanical packer, hydraulic packer, well fluids, differential pressure and temperature.

Field development activity management depends on technologies and structures that approved in Russian and foreign practice. Successfulness of such activity can be achieved by priorities identification of offshore constructions and technologies evolution. In this regard methodology of development of arctic field facilities construction’s conceptual schemas is offered in this article.

Keywords: field development and operation, offshore oil and gas fileds, constructions and technologies, Arctic shelf.

In paper results of scientific and applicative works on complex reconstruction of refining natural gas processes, in particular selective desulphurization, low temperature separation, intermediate storage of propane-butane fraction, are introduced.

Keywords: refining natural gas, desulphurization, low temperature separation, corrosion, modernization of production.

The paper presents the results of experiments to identify the antimicrobial activity of the synthesized compounds and their complexes. The synthesized silicone nitrites have strong antimicrobial properties are multifunctional additives for petroleum oils, giving them antiwear, extreme pressure and anti-corrosion properties. In addition the results of quantumchemical studies of the structure of a number of silicone nitrites and their complexes with transition metal salts: The influence of different substituents and salts on the structure of the nitrile and coordination bonds. Also presented features of the distribution of the effective charges on the atoms of the monomers. It was found that the silicone complexation with nitrites salts of transition metal π-complexes are formed. Contribution π-binding coordination bond increases in the order of metal complexes Co<Ni<Cu<Zn.

Keywords: silicon organic nitrites, nitrile containing siloxane, siloxanes, chloronitrile, DFT-calculations