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Date submitted2020-07-02
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Date accepted2021-02-16
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Date published2021-04-26
Development of viscoelastic systems and technologies for isolating water-bearing horizons with abnormal formation pressures during oil and gas wells drilling
Article provides a brief overview of the complications arising during the construction of oil and gas wells in conditions of abnormally high and abnormally low formation pressures. Technological properties of the solutions used to eliminate emergency situations when drilling wells in the intervals of catastrophic absorption and influx of formation fluid have been investigated. A technology for isolating water influx in intervals of excess formation pressure has been developed. The technology is based on the use of a special device that provides control of the hydrodynamic pressure in the annular space of the well. An experiment was carried out to determine the injection time of a viscoelastic system depending on its rheology, rock properties and technological parameters of the isolation process. A mathematical model based on the use of a special device is presented. The model allows determining the penetration depth of a viscoelastic system to block water-bearing horizons to prevent interformation crossflows and water breakthrough into production wells.
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Date submitted2018-01-19
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Date accepted2018-03-23
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Date published2018-06-22
Topochemical kinetics of external friction during mechanical and thermal activation of the friction contact
The article deals with the process of contact interaction (relative displacement) of surfaces as a chemical reaction, the regularity of which is described by the Arrhenius equation. The kinetic characteristics of Gersi-Striebeck are obtained taking into account the mechanical and temperature conditions of the frictional contact. The process of interaction of materials in friction in the form of regularities of topochemical kinetics, realized due to the processes of formation and growth of adhesion adhesion nuclei, makes it possible to present the experimental characteristics in the form of theoretical dependences. These dependences reflect the entire range of variation of the coefficient of friction from the speed of mutual movement of materials, including at ultra-low sliding speeds. In the framework of this approach, the lubricating action of the medium prevents and blocks the reactions of the transition of nuclei to actively growing nuclei.
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Date submitted2009-10-28
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Date accepted2009-12-25
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Date published2010-09-22
Prediction of dynamic manifestations of rock pressure in the all over automated longwalls
- Authors:
- M. Roiter
- V. Kurfyurst
- K. Mairkhofer
- J. Veksler
The support control system «MARCO» has programs for the estimation of a geomechanical situation around the face by continuous measurements of pressure in the legs of support. The analysis of the face convergence allows to predict the possibility of a rock burst. The seam’s reaction on the shearer or plough influence may be the dangerous main roof collapse into the mine-out space of longwall.
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Date submitted2009-10-02
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Date accepted2009-12-03
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Date published2010-09-22
Particular formation of higher rock pressure zones with intensive mining of contiguous seams at coal mines of the «Suek-Kuzbass» CO
- Authors:
- A. I. Paltsev
- V. V. Zubkov
- N. V. Krotov
The problem of mining the suites of contiguous coal seams is considered. The sequential manner of seams mining essentially has influence on change of rock and gas pressure. The results of calculation and construction of borders of zones of higher rock pressure are presented. The analysis of conditions of hazardous zones formation is given.
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Date submitted2009-10-14
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Date accepted2009-12-27
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Date published2010-09-22
Modeling of geomechanical processes and their geophysical control in coal strata mining
- Authors:
- V. V. Zubkov
- I. A. Zubkova
The paper presents the results of combination of geomechanical and geophyisical monitoring. The stress state of the minable coal seams is calculated according to the program FAULT3D with account of mining operations plan, specific seam occurrence and geological disturbances. The analysis of seismic events in the geodynamically hazardous zone has been made.
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Date submitted2009-07-27
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Date accepted2009-09-15
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Date published2010-04-22
Geomechanical problems in the forecast of stress-strain state of underground stations of the metro at a great depth
- Authors:
- P. A. Demenkov
- I. E. Dolgiy
- V. I. Ochkurov
Forecast of stress and strain state of deep underground metro stations is considered in this article. A complex approach to study of static work of the metro stations including the in situ testing at different stages of their construction and numerical modeling with finite element method is shown.