Oil and Gas Research Institute

The process of urbanization of the oil and gas production complex in the north of Western Siberia in the 1960s1980s was marked by the active introduction of scientifically based approaches designed to minimize the negative effects of the Arctic and sub-Arctic climate on residents of new cities under construction. One of the serious problems in implementing project approaches to the formation of the urban environment in the Arctic was that they were only capable of predicting the specifics of the economic, social and environmental development of the new city in the relatively short term. The main aim of this article is to analyze the effectiveness of the urban planning theory developed by the LenZNIIEP team on the case of the city of Nadym, founded in the early 1970s. The study is based on the research work of LenZNIIEP. In order to obtain subjective assessments of the development and use of the urban environment of Nadym, a series of thematic interviews were conducted with experts and residents of the city. In addition, recent scientific literature on the topic of research has been analyzed. During the study, the features of design solutions and the evolution of the development of four urban planning subsystems of Nadym were considered. The task of urban planning physics was to minimize the discomfort caused to the city’s population by the harsh landscape and climatic conditions. An important result of the development of urban ecology was the successful greening of open urban spaces in the Arctic climate. The main task of urban planning psychology was to create color schemes for buildings that are comfortable for Arctic conditions. The tasks of urban planning sociology included the adaptation of the urban environment to the demographic and socio-economic characteristics of the young Arctic city. The case of Nadym demonstrates that effective implementation of all urban planning subsystems can mitigate the effects of the harsh Arctic climate on the city residents and improve quality of their life. At the same time, due to the paradigm change in urban development of the Russian Arctic, the development of an “adaptive” approach is becoming increasingly relevant, as it was designed to identify and implement individual strategies for organizing a comfortable urban environment, taking into account the characteristics of local natural and climatic conditions.

In this work, we investigate the elastic properties of deflated vesicles and their shape dynamics in uniaxial extensional flow. By analysing the Helfrich bending energy and viscous flow stresses in the limit of highly elongated shapes, we demonstrate that all stationary vesicle configurations are metastable. For vesicles with small reduced volume, we identify the type of bifurcation at which the stationary state is lost, leading to unbounded vesicle elongation in time. We show that the stationary vesicle length remains finite at the critical extension rate. The critical behaviour of the stationary vesicle length and of the growth rates of small perturbations is obtained analytically and confirmed by direct numerical computations. The beginning stage of the unbounded elongation dynamics is simulated numerically, in agreement with the analytical predictions.

The article presents the results of studies on the phase behavior of n-nonadecane (C19H40) particles in an aqueous dispersion. The average radius of the n-alkane particles was 77 nm. The phase behavior studies were carried out using an original optical method. The experimental results (phase transition temperatures of melting, crystallization, and rotator phases) were compared with the results of studies performed using calorimetry methods. In the nanosized n-alkane particles, a rotator–rotator phase transition was observed, which was not observed in a bulk sample. This additional phase transition was also observed in other n-alkanes presented in the form of a nanosized aqueous dispersion.

The article contains a list of 47 species of Lepidoptera from the Thyrididae, Crambidae, Tortricidae, Hesperiidae, Papilionidae, Pieridae, Lycaenidae, Nymphalidae (including Satyrinae), Geometridae, Erebidae families from the territory of Evenkia. 18 species are new to the North Yenisei Region in Catalog of Lepidoptera of Russia, among them Thyris fenestrella (Scopoli, 1763), Chrysoteuchia culmella (Linnaeus, 1758), Crambus lathoniellus (Zincken, 1817), Epiblema simploniana (Duponchel, 1835), Grapholita compositella (Fabricius, 1775), Euphydryas intermedia (Ménétriés, 1859), Mellicta britomartis Assmann, 1847, Lomaspilis marginata (Linnaeus, 1758), Chiasmia clathrata (Linnaeus, 1758), Jodis putata (Linnaeus, 1758), Xanthorhoe deflorata (Erschoff, 1877), Xanthorhoe designata (Hufnagel, 1767), Mesoleuca albicillata (Linnaeus, 1758), Idaea pallidata ([Denis & Schiffermüller], 1775), Scopula immorata (Linnaeus, 1758), Polypogon tentacularia (Linnaeus, 1758), Phytometra viridata (Clerck, 1759), Callistege mi (Clerck, 1759).

This article presents core-flooding experiments on a Bazhenov Formation core sample designed to evaluate whether post-water methanol treatment can restore permeability. At reservoir conditions (110 °C, 23.5 MPa), the core was first water-flooded and then subjected to oil injection into the water-saturated rock, which caused severe, progressive permeability loss. NMR T1-T2 mapping captured fluid redistribution and the growth of bound/high-viscosity components. Gas chromatography indicated C36+-rich precipitates. A subsequent methanol flush stabilized the pressure drop and restored $\sim$87% of the pre-damage water permeability. These findings elucidate a water-oil-rock interaction pathway for rapid colmatation in Bazhenov shale and demonstrate an effective methanol-based protocol for permeability restoration.

The fine structure of the seismic background in the territory of an oil field was studied using polyspectral analysis and surrogate models. The statistical test for Gaussianity and linearity showed that the natural seismic background in the 1–50 Hz frequency range is a nonlinear process. Bicoherence graphs revealed statistically significant peaks of phase-coupled triplets with a characteristic geometry of peak clustering in the triangular principal domain. To analyze the quasi-noise component of the seismic background, surrogate time series with a randomized phase spectrum were generated, the bispectra of which are free of triplet peaks. Bispectral analysis of surrogate series showed the presence of a non-Gaussian quasi-noise component in the seismic background in the frequency range of 1–6 Hz. Previously, the results of the analysis of the used set of records by two completely different methods, each of which extracts information from different components of the seismic background, quasi-noise and regular, were published. These studies showed that each of the two components contains information sufficient to estimate the total thickness of the productive intervals under the recording point. Based on the results of the bispectral analysis and the features of the algorithms of the two methods, a conclusion was made that the quadratically phase-coupled triplets and the non-Gaussian quasi-noise component in the field territory are manifestations of endogenic seismic emission and are generated by the same nonlinear process developing in the vicinity of an oil-saturated reservoir. The mechanism of seismic emission should be sought in the class of phenomena with quadratic nonlinearity. The statistical characteristics of the internal structure of the seismic background near oil wells have similar features that differ greatly from the statistical characteristics of the seismic record near a “dry” well located outside the reservoir and not producing oil. Previously unknown prognostic features of the oil/water saturation type of rocks have been identified.

A finite-element scheme has been developed, including a section of reservoir rock, cement stone, casing and perforation channels. It is noted that in order to exclude the occurrence of stress concentrators at the casing – cement stone and cement stone – rock contacts, contact elements are specified in the numerical model, due to this, structural elements «slip», but at the same time, a reliable redistribution of stresses is carried out. Numerical simulation of the stress state of the near-wellbore zone using the developed model with varying depression on terrigenous reservoir for the conditions of one of the Perm Region oil field is carried out. It is shown that the safety factor of the casing is about 3–4 units, with the exception of small areas near the upper and lower areas of the perforations, where this indicator is close to one. For cement stone, the safety factor was 2-3 units and however, areas with its lowest value (1.35), also concentrated near the perforation channels, were note. To analyze the change in permeability, the dependence of this characteristic on effective stresses was used and it was found that zones of reduced stresses and an increase in permeability up to 20% of the initial value are detected in the upper and lower parts of the perforations. With an increase in depression on the reservoir, permeability decreases, especially in the lateral sections of the holes, where this parameter can decrease by 25% of the initial value. Using the Coulomb-Mohr criterion, areas of rock destruction from stretching and compression were identified. It is noted that with increasing depression, the areas of destruction under tensile stresses disappear and the areas of destruction under compression increase. An analysis of the change in the productivity coefficient depending on the depression showed that when creating a maximum depression on the 12 MPa formation, the productivity coefficient of the well can decrease by 15% due to compaction of the reservoir rock caused by an increase in effective stresses.

The aim of the work is to select a method for studying the quantitative characteristics of the reservoir properties of the pre-Jurassic oil and gas complex of Western Siberia according to 3D seismic data and testing it on real data. The weathering crust in the Pre-Jurassic complex of Western Siberia was chosen as a methodological example, since with its relatively small capacity (from 0 to 50 meters) reflections from the roof and the sole are not separated. The amplitude-frequency response of this interference reflection depends on the thickness, and therefore some seismic attributes may react to this. To clarify these connections, full-wave seismic modeling using the spectral element method was used for the first time within the framework of the advanced domestic CAE FIDESYS software developed by graduates and staff of the Chair of Computational Mechanics of Lomonosov Moscow State University and adapted by staff and graduate students of the Geological Faculty of Moscow State University to solve the tasks set. This article presents the first results of their practical use. According to comparative calculations, it has been established that the traditional beam modeling methods previously used in seismics, coupled with convolution with reflection coefficients, give false results and therefore are not recommended for further use. The proposed and tested technology made it possible to build a forecast map of the thickness of the potentially oil and gas-bearing weathering crust in the roof of the of the Pre-Jurassic complex on the 3D survey area.