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This article presents the results of drilling a 1-k core well in Zverinogolovskoye district of Kurgan region and the study of core material. A number of researchers have doubts about the fact that the reason of periodic appearance of an oil film on the Alabuga River was the migration of oil from the depths. Some people assumed that it could get to the river in a small amount by accident, for example, farmers spilled it during fieldwork. In 1959, 1-k and 2-k wells were drilled in order to check and study oil occurrences along the Alabuga River. Core wells 1-k and 2-k have traversed the cover deposits of the Meso-Cenozoic and have exposed the basement rocks represented by red flowers of presumably Permian-Triassic age. This made it possible to study the lithology and stratigraphy of the sediments, which were involved in the structure of the area. The angles of inclination of red-colored rocks measured by the core of the 1-k well give an idea of the degree of their disturbance. The facies-lithological features of these rocks, the absence of fauna and flora in them, and other signs indicate that the formation of red-colored deposits occurred under continental conditions. The signs of Permian-Triassic oil found in the 1-k well are of fundamental importance. These oil occurrences are also of interest in the fact that they were detected in the area, where oil was observed to the surface.

The article presents the facts of possible gas field discovery in Petukhovo district of Kurgan region. In 1962, a structural prospecting well 4-G was drilled to a depth of 928 m in the area of Petukhovo state farm in Kurgan region. When drilling the well in the process of trial pumping from a depth of 900.85-923.4 m, a gas release occurred with a rapid release of combustible methane gas. The first signs of weak carbonation were observed from a depth of 227 m, gas indicators didn't exceed 7%.Subsequent seismic surveys established a calm occurrence of sediments of Mesocainozoic age and revealed a weak dislocation of rocks of the Paleozoic complex. The study of the surface of the lower reference reflecting horizon, which is linked to the bottoms of Mesozoic sediments or the roof of the Paleozoic foundation, made it possible to identify three local positive structures: Medvedevskoe, in the area of Lake Medvezhye, measuring 4×13 km, contoured with an isohypse of -700 m, with an amplitude of 50 m; the west of the village of Kazantsevskoye, measuring 1×2.5 km, contoured with an isohypse of -650 m; the north of the village of Kazantsevskoye, measuring 2×3.5 km, contoured with an isohypse of -700 m, with an amplitude of 50 m. The selected structures at that time were recommended for testing oil and gas prospects by drilling. In case of positive results, it was recommended to continue areal seismic studies in order to delineate the selected uplifts the north of the village of Pashkovo and the northwest of the village of Grenadiers, followed by their verification by drilling.The authors of the article carried out an expedition to Petukhovo district. As a result, they found liquidated wells in the north of Lake Domozhirovo (presumably, wells 4-G and 2-PR), the conditions of mouths of these wells were established. The authors give recommendations for conducting geological exploration in the territory of Petukhovo district.

The article discusses the main technological processes of well construction for the production of high-viscosity hydrocarbons from productive lowporosity reservoirs with high temperature and pressure conditions, which include shale deposits of Bazhenov formation. According to the results of the review and analysis of existing solutions in the development of this deposits, the following measures were justified and proposed: construction of branched multi-hole azimuth horizontal wells, implementation of selective multi-stage hydraulic fracturing in the productive formation; the use of oil-based process fluids when opening the reservoir, the use of plugging materials for isolation of the reservoir, the hardening product of which is represented by thermally stable hydrate phases (hydrobasic hydrosilicates). Вranched wells have a long horizontal end (about 1 000 meters or more). Only a part of the horizontal section works effectively, which is the basis for the development and application of the staged, both in time and along the strike, hydraulic fracturing method. At the level of the invention, a method and apparatus for carrying out multistage selective hydraulic fracturing in wells with horizontal completion have been developed. The article describes a method for implementing multistage selective hydraulic fracturing, comparing this method with the existing ones. Much attention is given to the need to use hydrocarbon-based solutions for the initial opening the reservoir, to use cement slurries from composite materials to separate the reservoir, the hardening product of which is a stone formed by low-basic calcium hydrosilicate.

The article presents a technology for building a water-shut screen in an oil well. The technology is based on drilling of radial channels within the water-encroached formation and following injection of water insulation composition in these channels. The proposed technology provides a durable screen of increased diameter and width. It contributes to a longer period of low watercut production in an oil well.

Currently, metrology is an important element of any industry. Under these conditions, the accuracy of testing and calibration of measuring devices becomes critical. Due to the high accuracy of modern measuring instruments, human factor can play a significant negative role in the calibration process. Therefore, the use of modern tools, such as a data logger, can significantly improve the quality of the process, reducing staff functions to process control.

The paper describes the method of isolation of bottom water inflow in oil wells. The method of isolation of inflow of formation water in the well, watered by water cone flowing into the near-wellbore area, is drilling is carried out from the main borehole of the stopped well into the productive formation with water intrusion into radial offshoots along the radiusbelow of the well perforation interval. They pump the waterproofing composition into referred radial offshoots with the creation of the waterproofing screen along the radius of the main wellbore. They leave the well for a period of reaction of composition injected under pressure and perform a subsequent well completion through existing perforations of the perforated interval.

The article presents the results of experimental studies of the surface properties of gas-thermal spray coatings of the rotor downhole drilling motors. Was analyzed the adhesion and corrosion resistance of coatings, obtained as a result of putting various powders on steel of various grades. It was established experimentally that the substrate material of the examined steels has almost no effect on the adhesion of the coating.

The article describes the methods of applying of protective coatings to the rotor of downhole drilling motors. The analysis of the effectiveness of methods of applying of protective coatingswas carried out. The article shows that the transition to gas-thermal spraying method with laser melting allows to achieve high technical and technological results in comparison with other methods.

The article analyzes the results of tests of mechanical resistance of laboratory specimen coating applied by laser deposition. Based on the analysis a conclusion is drawn about the effect of protective coatings and their application methods on the friction coefficient and relative wear resistance.

The article discusses development of the backfill composition based on OTDV «Mikrodur». A method of mathematical planning of the experiment is described used to prove the optimal formulation of water isolation composition and the processing of the study results by application of the procedure of “full factorial experiment”. The results of the study by computer microtomography of the formed plugging stone are also presented.

In this paper a method is presented for gas and gas condensate wells killing in the complicated conditions, that is in the conditions of abnormally low reservoir pressures and with presence of casing string leaks.

The article presents the main causes of water and sand production in oil wells, the consequences of forma-tion of sand plugs and also the methods of prevention of this type of problem. The authors developed the method of reduction of sand production in oil wells. The distinguishing feature of developed method from known ones is the creation of sand filter directly inside the oil well. For effective selection of proppants as applied to geological and physical conditions of wells the authors developed a software «Proppants», which is a database on physical and mechanical and filtration properties of proppants.

The article analyzes the basic geological and engineering factors of risk which must be taken into account before implementing the repair-isolation operations in oil and gas wells as well as graphical diagnostics of water cut development on the example of wells in the field Povhovskoye. The field-geophysical methods and actuality of hydrodynamic modeling are also discussed.

The paper presents the results of studying the well plugging solutions based on the microdur composition. Separately are presented the results of the study of pore space of the formed backfill stone prepared by offered formula No.2.

This study subject is methods of elimination of open gas blowout and fire. The threat of directed blowout of reservoir fluids onto the earth surface is observed during the entire cycle of oil-and-gas well construction. Such mining engineering construction ensures hydrodynamic communication between the rock beds and the earth surface. To the authors’ opinion the main cause of emergences and gas showings occurrence is failure to observe the industry safety requirements.

The article presents the methodical aspects of diagnostics of wells drowning causes on the example of well No.106, Povkhovskoye oil field (layer BV8), based on determination of major geological and technological factors of risk of well drowning occurrence and on the graphical analysis of the well performance for a specified period of time.