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мыс Фиолент

Geology
  • Date submitted
    2022-03-20
  • Date accepted
    2022-05-25
  • Date published
    2022-07-26

Ophiolite association of Cape Fiolent (western part of the Mountainous Crimea) – the upper age constraint according to the U-Pb isotope dating of plagiorhyolites (Monakh Cliff)

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The article presents the results of U-Pb isotope dating (SHRIMP-II, VSEGEI, Saint Petersburg) of zircon crystals extracted from plagiorhyolites of the Monakh Cliff in the area of Cape Fiolent in the western part of the Mountainous Crimea (southern suburb of Sevastopol). a concordant age estimate of 168.3±1.3 Ma was obtained from 20 zircon crystals. It exactly corresponds to the Bajocian/Bathonian boundary of the Middle Jurassic according to the International Chronostratigraphic Chart (February 2022 version). The available results of isotope dating of igneous rocks from the Mountainous Crimea, as well as their geochemical typification are synthesised. The plagiorhyolites of the Monakh Cliff in the area of Cape Fiolent are spatially, and most likely paragenetically, associated with the wallrock (Cape Vinogradny) and ore (Heraclea Plateau on the cognominal peninsula) massive sulphide formations, as well as pillow basalts, gabbroids, and serpentinized hyperbasites, combined into the ophiolite association of Cape Fiolent. The obtained dating is the upper age limit for the entire ophiolite association of Cape Fiolent.

How to cite: Kuznetsov N.B., Romanyuk T.V., Strashko A.V., Novikova A.S. Ophiolite association of Cape Fiolent (western part of the Mountainous Crimea) – the upper age constraint according to the U-Pb isotope dating of plagiorhyolites (Monakh Cliff) // Journal of Mining Institute. 2022. Vol. 255 . p. 435-447. DOI: 10.31897/PMI.2022.37
Oil and gas
  • Date submitted
    2021-04-30
  • Date accepted
    2021-11-30
  • Date published
    2021-12-27

Methodology for testing pipeline steels for resistance to grooving corrosion

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The methodology for testing pipeline steels is suggested on the assumption that for the destruction of pipes in field oil pipelines by the mechanism of grooving corrosion the simultaneous fulfillment of such conditions as the occurrence of scratches on the lower generatrix of the pipe, eventually growing into a channel in the form of a groove, emulsion enrichment with oxygen, presence of pipe wall metal in a stressed state, presence of chlorine-ion in the oil-water emulsion is required. Tests are suggested to be carried out in 3 % aqueous solution of NaCl with continuous aeration by air on bent plates 150×15×3 mm, made of the analyzed steel, the middle part of which is under the action of residual stresses σ res , close to the level of maximum equivalent stresses σ eqv in the wall of the oil pipeline, with the presence of a cut on this part on the inner side of the plate as an initiator of additional mechanical stresses. Using the value of the modulus of normal elasticity of the analyzed steel, the degree of residual strain of the elastic-plastic body from this material, corresponding to the value σ res ≈ σ eqv is calculated, based on which the plates are bent to the required deflection angle, after which the cut is applied to them. After keeping the plates in the corrosive medium for each of them the increase in depth of the cut as a result of corrosion of the walls by the corrosive medium is analyzed, from which the rate of steel K by the mechanism of grooving corrosion is calculated taking into account the duration of tests. Corrosion rate values for two pipe steel grades determined by the suggested procedure are given. The comparison of K values obtained leads to the conclusion about the higher resistance to grooving corrosion of 09G2S steel.

How to cite: Bolobov V.I., Popov G.G. Methodology for testing pipeline steels for resistance to grooving corrosion // Journal of Mining Institute. 2021. Vol. 252 . p. 854-860. DOI: 10.31897/PMI.2021.6.7
Oil and gas
  • Date submitted
    2019-03-18
  • Date accepted
    2019-04-26
  • Date published
    2019-08-23

Spatial Models Developed Using Laser Scanning at Gas Condensate Fields in the Northern Construction-Climatic Zone

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Wide exploration and industrial exploitation of hydrocarbon fields in Yamal Peninsula pose in front of construction and mining companies critical problems of efficient construction at constantly evolving fields taking into account climatic and geocryological conditions of their location. Yamal Peninsula is characterized by unstable soils, the mobility of which has a substantial impact on the changes in spatial arrangement of field facilities, not only in the direct process of construction, but also during their scale-up and equipment overhaul. The paper examines implementation of 3D spatial arrangement modelling of industrial facilities into the process of construction and installation works at hydrocarbon fields in the northern construction-climatic zone. The purpose of implementing this method combined with 3D spatial modelling of equipment connections lies in reliability and safety enhancement of the facilities throughout their entire lifespan. Authors analyze statement and solution of the problem associated with alignment and installation of prefabricated equipment and pipelines, taking into account advanced technologies of 3D design and modelling. The study examines a 3D spatial model with the elements of equipment connection geometry; the model is related to existing production facilities at the field. Authors perform an analysis and in mathematical terms formulate the problem of optimal spatial arrangement for such models. The paper focuses on typical deviations, occurring in the installation process of constructions and connection facilities, their spatial arrangement is modelled. Possible solutions are offered, as well as an algorithm of their implementation at an operating field.

How to cite: Menshikov S.N., Dzhaljabov A.A., Vasiliev G.G., Leonovich I.A., Ermilov O.M. Spatial Models Developed Using Laser Scanning at Gas Condensate Fields in the Northern Construction-Climatic Zone // Journal of Mining Institute. 2019. Vol. 238 . p. 430-437. DOI: 10.31897/PMI.2019.4.430
Oil and gas
  • Date submitted
    2018-01-17
  • Date accepted
    2018-03-09
  • Date published
    2018-06-22

Control and regulation of the hydrochloric acid treatment of the bottomhole zone based on field-geological data

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The analysis results of the hydrochloric acid treatment of the bottomhole zone efficiency along the deposits of high-viscosity oil in the carbonate reservoirs of the Tournaisian stage are presented in the paper. Based on the use of the non-parametric Kulbak criterion, the most informative geological and technological parameters, which affect most the success of hydrochloric acid treatments, assessed by the criteria of increased oil production and reduced water cut, are revealed. The generalization of the hydrochloric acid treatments experience in the conditions of the high-viscosity oil reservoirs of the Tournaisian Stage allows for efficient forecasting, selection of wells, control and regulation of the treatment process to reduce the number of inefficient operations and improve the technical and economic parameters of fuel and energy enterprises at the investigated sites and the ones with similar field-geological characteristics.

How to cite: Rogachev M.K., Mukhametshin V.V. Control and regulation of the hydrochloric acid treatment of the bottomhole zone based on field-geological data // Journal of Mining Institute. 2018. Vol. 231 . p. 275-280. DOI: 10.25515/PMI.2018.3.275
Electromechanics and mechanical engineering
  • Date submitted
    2014-09-13
  • Date accepted
    2014-11-12
  • Date published
    2015-06-26

Complex power supply at well drilling in complicated climate conditions

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The article deals with the problems of complex power supply of the well construction process in adverse climatic conditions. An option of associated petroleum gas utilization in power units for drilling operations is offered. The method of calculating heat losses of technological objects and required heating capacity for maintaining working temperature is given. A combined heat and power scheme enabling simultaneous electric and heat supply of oilfield objects with the use of associated petroleum gas as an energy source for power generation units is developed. Implementation of such a scheme guarantees power structure functioning without downfalls of produced en-ergy during the year, thus maintaining high efficiency of overall power generation.

How to cite: Lebedev V.A., Leusheva E.L., Morenov V.A. Complex power supply at well drilling in complicated climate conditions // Journal of Mining Institute. 2015. Vol. 213 . p. 47-53.