On the relevance of using a complex combination of NIEMFE and EM methods in forecasting rock deformation

Kuzmenko, E.; Maksumchuk, V.Y.; Bagriy, S.; Sapuzhak, О.Y.; Chepurnyi, I. V.; Dzoba, U.O.

doi:10.3997/2214-4609.201801820

Cited by 3 publications

(1 citation statement)

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“…Energies 2022, 15, 5031 3 of 13 surface string from the vertical reaches 6° and is associated with shear processes. Within the area where the well is located, a planned-altitude geodetic survey, ground-based geophysical surveys using electrometric methods [64], as well as a detailed complex interpretation of well logging data for the upper part of the section [65] were performed. The geophysical prerequisites for landslide hazard include anomalies of geophysical parameters, which, by their physical content, are unconditionally associated with the activation of landslides, in particular, zones of low electrical resistance, lithologically consistent with clays, which are potential slickensides with a depth of up to 7 m. The interpretation of the described problem does not fit into the typical algorithms that are offered to the manufacturers by the current directive documents.…”

Section: Introductionmentioning

confidence: 99%

Mechanism of Casing String Curvature Due to Displacement of Surface Strata

et al. 2022

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One of the main problems of well operation is the risk of uncontrolled leakage of hydrocarbons into the environment. This problem is especially relevant for the long-term operation of wells. The idea for this study was inspired by a real industrial problem that the authors of the article were involved in solving. At several operating gas wells, an abnormal slope of the production tree occurred, which raised the question of the safety of their further operation. An analysis of known studies and current regulatory documents did not allow us to assess the safety of using a gas well based on the measured kinematic parameters of production tree deviations. A mathematical model for the deformation of a package of casing strings when the surface layer of the rock is displaced is developed in the article. A boundary value problem is formulated for differential equations of pipe bending on an elastic foundation. Based on the results of solving this problem, an unambiguous relationship was established between the maximum bending stress in the surface pipe and the angle of inclination of the production tree. The quantitative characteristics of the connection depend on the geometric and mechanical properties of the pipes and on the thickness and mechanical parameters of the formations. It was established that the existing inclination of the production tree can be achieved due to the beginning of the plastic bending of the surface pipe under the slickenside, which does not exclude the exhaustion of the safety margin of the surface pipe and indicates the possible operation of the casing string in a pre-emergency state. In general, the obtained results develop analytical approaches to assessing the behavior of underground structures of a production well in unstable soil bodies.

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Section: Introductionmentioning

confidence: 99%

Mechanism of Casing String Curvature Due to Displacement of Surface Strata

et al. 2022

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Analysis and modeling of the hydrogeodynamic situation within the Stebnyk deposit of potassium salts

Kuzmenko

Davybida

Bagriy

et al. 2019

МРУ

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The purpose of the research was to determine the danger degree of saline waters breakthrough in the mine No. 1 due to the self-flooding of mine No. 2 by constructing digital models of the basic geological and hydrogeological elements, matching them with the stressed state of rocks within zones of the “Western” and “West” pit shafts and the seal of mines № 1 and № 2. Geophysical studies were carried out by the method of the natural pulsed electromagnetic field of the Earth (ENPEMF), which makes it possible to promptly assess the stress-strain state of rocks. In addition, the geological and hydrogeological situation of the study area was simulated to solve this problem. According to the results of the analysis of hydrogeological regime observations in the period from 2004 to 2017, long-term trends of changes in the groundwater level of the aquifer were established. Taking into account the filling of mines № 2 and drainage, the movement of groundwater from the research area towards the north – northwest is currently noted. There is a difference in groundwater levels up to 13 meters. Based on the results of interpretation of geophysical research data on the basis of which ENPEMF intensity maps were constructed, as well as taking into account geological and hydrogeological models, it was found that no significant anomalies of the field intensity corresponding to catastrophic stressstrain state were observed at present (including through additional hydraulic pressure to testify about the danger of a breakthrough reservoir water). Obviously, that obtained results do not raise any doubts about the further operation of mine № 1 at present. However, when the mine № 2 be completely flooded, it is advisable to check the regime hydrogeological observations of groundwater levels and the ENPEMF measurements to investigate possible changes in the stress-strain state of the rock mass.

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Subsidence and failures within the territory of Precarpathian salt fields and the possibility of their prediction

Kuzmenko¹,

Chepurnyi²,

Chepurna³

et al. 2020

Nauk. visn. nat. hirn. univ.

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Purpose. To show the effectiveness of application of method of natural pulsed electromagnetic field of the Earth (NPEMFE) in issues of spatial prediction of the earth's surface deformation, for assessing the karst hazard within territories with exhausted salt deposits. Improvement of existing methods of interpretation of data obtained as a result of applying of NPEMFE by involving geodetic information.Methodology. Processing the information obtained as a result of measurements of the NPEMFE with the help of GIStech nologies. Spatial combination of data interpretation results obtained through the NPEMFE method with results of geodetic obser vations.findings. The image of the spatial combining of NPEMFE intensity maps and the earth surface subsidence is constructed. The hypothesis that the anomalies of NPEMFE are a direct indicator of displacement of the earth's surface is proved. originality. For the first time, on the example of the territory of the Stebnyk potassium salt mining field, the results of topogeo detic survey and those of the geophysical method of NPEMFE have been compared. Connection of geodetic and geophysical data and a significant level of their correlation is proved. This gives grounds for considering the NPEMFE method as a predictive in terms of forecasting the development of deformation processes of the earth's surface.Practical value. The improvement of the method for interpreting the NPEMFE data by involving geodetic information is pro posed.

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On the relevance of using a complex combination of NIEMFE and EM methods in forecasting rock deformation

Cited by 3 publications

References 0 publications

Mechanism of Casing String Curvature Due to Displacement of Surface Strata

Mechanism of Casing String Curvature Due to Displacement of Surface Strata

Analysis and modeling of the hydrogeodynamic situation within the Stebnyk deposit of potassium salts

Subsidence and failures within the territory of Precarpathian salt fields and the possibility of their prediction

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