The article is devoted to increasing the efficiency of well testing in the construction of seismic models of oil and gas objects. We suggest using the adaptive approach, which has been developed by us, to processing and interpretation of well testing data; it will increase the efficiency of management of the processing and interpretation of well testing data. The essence of the approach consists of dividing the process into stages, developing for each stage a multivariate decision scheme, and formal criteria for evaluating the results.

A conceptual framework has been developed for the implementation of the proposed approach as applied to the processing and interpretation of well testing data in order to construct seismic models of terrigenous deposits in Western Siberia. We propose formalized criteria for assessing the quality of processing results of well testing data, modeling of well testing curves, and determination of petro-physical parameters. The results obtained are illustrated on practical data on oil fields in Western Siberia.

The maintenance safety of the wellbore in clay-claystone formations is important aim for modern investigations for companies in Western Siberia as usual. There is a lot of non-productive time to do sidetrack due to weak clay rocks. The analysis was done to solve these true challenges of the sidetrack into the different production zones. There is a lot of non-productive time for the accident responses because of wellbore lose control. For example, 50 % of drilling time has non-productive time to stabilize wellbore. There are the most effective ways to prevent losing control of wellbore: control of mud density and pressure drop variation, using of inhibitors with high effectivity, applying stabilizing bath in dangerous zones.

In this article, numerical methods are used to analyze the features of solutions to the non-isothermal Muskat — Leverett two-phase filtration model. The structure of solutions to thermal waterflooding problems for low-viscosity and high viscosity types of oil is considered. Typical solutions for different types of functional parameters of the model are shown. The simulations show that hot water displacement of high-viscosity oil is an effective method of increasing oil recovery. In particular, if in the case of thermal flooding the reservoir with low-viscosity oil, recovery increases by only a few percent, then for a field with high viscosity oil, thermal flooding increases oil recovery by tens of percent. It is shown that in order to increase the efficiency of the thermal flooding it is necessary to pump hot water with the minimum possible capillary parameter. High total filtration rate reduces total heat loss through the roof and sole of the formation. Numerical experiments have shown that for an adequate simulation of thermal flooding, in addition to taking into account changes in oil viscosity, it is necessary to take into account the action of capillary forces and the variation of relative phase permeability during the operation of the oil field.

The development of deep-lying Achimov deposits makes it possible to extract additional volumes of gas and gas condensate in the fields with decreasing production, as well as implement strategies to introduce new methods to increase oil, gas and condensate production. The decrease in well productivity during the development of gas condensate fields requires the use of new methods of intensification of production. The main method for increasing the productivity of Achimov wells is hydraulic fracturing. The choice of hydraulic fracturing technology for low-permeability Achimov deposits is especially important for creating large hydraulic fractures and high permeability, as well as maintaining the filtration characteristics of reservoir rocks. Multi-stage hydraulic fracturing is the most effective method of intensifying gas and gas condensate production in the development of the Achimov deposits.

To provide the first principle of usage the permafrost ground as the base it is necessary to design methods that eliminate or decrease structures thermal influence on permafrost.

Usually choosing thermal stabilization solutions the task is to ensure foundation reliability on permafrost but also decrease the construction and operation expenses due to optimization of adopted decisions. Forecast modeling of soil bases temperature regime is required for this. Analysis of norms and standards showed the absence of standardized requirements to the calculations algorithm.

The article is devoted to the main problems of forecast modeling of soil base temperature regime and mistakes in selecting of thermal stabilization solutions. We give the examples of optimization of thermal stabilization solutions. Also, we determine the ways to solve the identified problems; these include typification of engineering and geocryological conditions, typification of structures by intensity of thermal influence, selecting of optimal thermal stabilization solutions for each type, standard elaboration of making forecast modeling of soil base temperature regime.

Research has found that the axial load applied to the bit is distributed unevenly along the crowns of the balls. The middle crowns are the busiest. The value of the axial force perceived by a separate ring is associated with the deformation of the details of the ball joint. You can reduce the uneven loading of crowns by shifting them along the ball along the radius of the bit, placing them so that the vertical line passing through the center of the lower ball of the lock bearing passes through the middle of the gap between the crowns of neighboring balls. The bits with the new option of placing the teeth on the balls were tested on the stand and in industrial conditions. For the bits of this design, the axial load was distributed more evenly over the crowns, which allowed increasing the efficiency of their work.

The development of undersaturated oil layered heterogeneous oil reservoirs against the background of a general depletion of oil reserves is becoming increasingly interesting. The development of these hard-to-recover oil reserves is associated with non-standard changes and increased water-cut in wells. An undersaturated (unformed, young) reservoir is a conditionally large transitional water-oil zone of the reservoir, in its classical sense. It is assumed that, since the initial oil saturation of the formation is low, and the water saturation is correspondingly high, the starting water cut should correspond to this ratio, but this is not so in some cases. At the same time, it is difficult to say in advance whether water-cut will increase, stabilize or fall in the first months. The study is aimed at identifying the determining parameter and the ranges of its change by statistical methods, based on which it will be possible to predict with high probability the nature of the change in water cut during the feasibility study for drilling new wells. For the conditions of the selected object, a graphical dependence of the water cut deviation in the initial period of well operation from layered heterogeneity of the reservoir is found. The results of the study are the rationale for creating new technologies for the selective isolation of oil-layers. It should to allow reversibly limiting the permeability of the low-permeability low-saturated part of the reservoir. Most of the existing technologies are aimed at the selective isolation of high-permeability and watered layers.

For prevention and combating paraffin deposites different chemical regents are widely used (wax inhibitors). In field conditions many ways of chemical regents dosing are applied. Injection of chemical reagents in oil well tubing is the most effective for wax inhibitors; in this case consumption of reagents is largely decreasing by comparison with chemical reagents dosing through the well-casing annulus. The article describes design and operating processes of technology of wax inhibitor dosing in electric centrifugal well pumps installation. This process opens fluid access to oil well tubing at higher pressure at the wellhead. Reagent RT-1-3 is used as aromatic wax inhibitor. In RT-1-3 there is butylbenzene fraction of Kazanorgsintez PJSC containing a mixture of butylbenzene, isopropylbenzene and polyalkylbenzene.

The article performed the processing of the results of a computer experiment to determine the cooling time of oil in a stopped oil pipeline. We proposed a calculation model in previous works that allows you to simulate the process of cooling oil.

There was a need to verify the previously obtained results when conducting a laboratory experiment on a stand with soil. To conduct the experiment, it was necessary to conduct the planning of the experiment. The factors affecting the cooling time of oil in the oil pipeline, which will vary in the proposed experiment, are determined, empirical relationships are established. A regression analysis was carried out, and the dispersion homogeneity was checked using the Cochren criterion. The estimates of reproducibility variances are calculated. The adequacy hypothesis was tested using the Fisher criterion. Significant regression coefficients are established.

The article numerically researched the stress-strain state of the tank RVS-20000 at the settlement zone is located near the tank wall. A numerical model of the tank was developed in accordance with the actual geometric dimensions, taking into account all structural elements of the structure and the maximum operating loads. When modeling local settlement to account for the spatial work of the soil, the model of the Pasternak soil base was used. The stress-strain state calculation of the tank was performed at values of the radius of the drawdown zone from 1 to 10 m. The choice of this interval is due to the fact that in more than 92 % of cases, tanks with local bottom settlements fall within this range of values.

The dependences of the maximum acting stresses in the wall of the internal combustion engine on the position of the inhomogeneity area in the soil base are established. The boundary of the zone of action of the edge effect from the tank wall is established. If the center of the heterogeneity area is located in this zone, it is necessary to conduct additional analysis of the tank metal structures stress-strain state when assigning the maximum settlement.

Article is devoted to questions of environmental risk analysis of accident on main and technological oil pipelines. The relevance of a subject consists in standard introduction of requirements about risk assessment to many fields of activity, related to danger or result indeterminacy. Thus, risk assessment requirements are stated in all international standards on the management systems, starting with ISO 9001. The aim of the article is consideration of a contingency situation on the oil pipeline in respect of its long-term environmental impacts. A research problem is development of conceptual model of man-caused accident impact on the ecological environment. During the solution of an objective research techniques were chosen, and situational models of risk estimation are developed. Based on the predesigned results, it is possible to draw a conclusion on the high level of environmental risk which isn't considered in the ecological management systems of the oil companies.

The article discusses the results of a study on the selection of wax inhibitors that can be used at the Kondinskoye oil field during transportation and dehydration of the emulsion.

Asphaltene precipitation is one of the most serious issues in oil production. The experiment was conducted in order to select the most effective wax inhibitors. We have carried out laboratory tests to choose the most effective wax inhibitor in the conditions of oil production, collection, preparation and external transport systems at the Kondinskoye oil field. Based on the data obtained, wax inhibitor-2, wax inhibitor-4, and wax inhibitor-6 have shown the best results in ensuring the efficiency of inhibition, which should be at least 70 %, and, therefore, they can be allowed to pilot tests. The recommended initial dosage of inhibitors according to the results obtained during pilot tests should be at least 500 g/t of oil.

Currently, the treatment of the bottomhole formation zone with acidic compositions is one of the most common methods to intensify the oil inflow. The use of various modified acid compositions increases the efficiency of acid treatments on the bottomhole formation zone. Acid compositions, including those containing hydrocarbon solvents, which contribute to more efficient removal of organic colmatants, affect the reaction rate of the reagent with the rock and processing equipment, change the reservoir properties, etc.

The article presents the results of experimental studies, which are aimed at establishing the effect of the composition of hydrocarbon-containing acidic emulsions consisting of an aqueous solution of hydrochloric acid, toluene and Neonol AF 9-10 on their dispersed and rheological properties, as well as their efficiency in removing paraffin deposits.

During the development of oil and gas fields and transportation of hydrocarbons, the ecology of regions is subject to various negative impacts. The most severe consequences for the environment are caused by accidental spills of oil or petroleum products, which occur due to through damage to pipelines. Polluted territories are subject to mandatory reclamation in accordance with government regulations and industry regulations. However, despite the measures taken by the administrations of the northern regions to increase the rate of reclamation of damaged territories in recent years, there has been a trend of growth of areas contaminated with hydrocarbons.

Various remediation technologies that have been tested in warm and temperate climates are not very effective in regions with permafrost. Pollution of the daytime surface with oil or petroleum products leads to an increase in the absorption of the sun's radiant energy, the growth of the seasonal thaw layer and the development of destructive processes for the territory. To achieve a positive effect as a result of rehabilitation measures, it is necessary to take into account the individual characteristics of the territory and the extent of its pollution.