Effect of Geometry of Internal Crack-Like Defects on Assessing Trouble-Free Operation of Long-Term Operated Pipes of Drill String

Vytyaz, Oleg; Hrabovskyy, R. S.; Artym, V. I.; Tyrlych, V. V.

doi:10.15407/mfint.42.12.1715

Cited by 6 publications

(5 citation statements)

References 9 publications

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“…The work performed by the authors is based on the idea of creating a technology for manufacturing a gravel filter element of a block structure with the connection of gravel material into a monolith using a water-based binding agent using cryogenic technology, followed by its installation in a well and the transition of gravel material from a monolithic state to a loose state due to the acquisition of rheological properties of water by the binding agent under the influence of formation water [31], [32].…”

Section: Methodsmentioning

confidence: 99%

Determination of the thermal state of a block gravel filter during its transportation along the borehole

Chudyk,

Sudakova,

Dreus

et al. 2023

Min. miner. depos.

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Purpose. Development of a methodology for determining the thermal state of block inverse gravel filters manufactured using low-temperature technology during their transportation in a well based on computer and mathematical modeling. Methods. The study of hydrodynamic processes occurring during the transportation of the filter in the borehole, as well as the calculation of thermal fields in the filter body, was performed using the Ansys Fluent software package. To determine the effective thermophysical characteristics of the filter, the approaches of the heat transfer theory in porous media were applied. To investigate the thermal conditions of the filter at heat exchange with well fluid, the use of analytical solution of the heat conduction problem in a cylindrical shell, taking into account the properties of porous dispersed water-saturated medium, is proposed. Findings. The methodology for calculating the thermal state of a gravel filter during its operation in a well has been developed. For estimation of the filter surface temperature, the expression obtained on the basis of the analytical solution of the heat conduction equation, taking into account the characteristics of the porous filter medium, is proposed. Hydrodynamic and thermal fields in the borehole and the filter body during the filter transportation process in the borehole have been obtained. Originality. For the first time, the problem of heat exchange of a gravel inversion filter, manufactured by low-temperature technology in a well is considered. The influence of hydrothermal conditions in the well on the process of filter heating during its transportation in the well is shown. The hydrodynamic fields during the flow of the drilling mud around the inverse gravel filter are determined. Practical implications. The proposed approaches and results of the study allow to determine and can be used in the development of technological regulations for the use of block gravel filters produced by low-temperature technology for the equipment of hydrogeological wells. The methodology for modelling the process of two-phase inversion transition of aggregate state of the binding agent during transportation of inverted block-type gravel filter during well construction has been developed.

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Section: Methodsmentioning

confidence: 99%

Determination of the thermal state of a block gravel filter during its transportation along the borehole

Chudyk,

Sudakova,

Dreus

et al. 2023

Min. miner. depos.

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“…Ivano-Frankivsk National Technical University of Oil and Gas (Ivano-Frankivsk, Ukraine), K. I. Satbaev Kazakh National Research Technical University (Almaty, Kazakhstan), Dnipro University of Technology (Dnipro, Ukraine), and Oles Honchar Dnipro National University (Dnipro, Ukraine) have rich experience and long-standing cooperation in scientific research and development works. Over the past decades, effective designs of tools for drilling medium-and high-hardness rock have been developed [1][2][3][4]; rational layouts of casing and drill strings have been substantiated [5][6][7][8][9][10]; innovative backfill materials have been developed [11,12] along with drilling fluids and technologies for their application [13,14] and gas hydrate production technologies [15].…”

Section: Introductionmentioning

confidence: 99%

A new method of oil and water well completion involving the implosion effect

Chudyk,

Biletskiy,

Ratov

et al. 2024

IOP Conf. Ser.: Earth Environ. Sci.

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Features of colmatation zones of a productive formation in terms of rotary drilling by drilling muds are considered. A brief analysis of the most popular decolmatation methods is performed. Special attention is paid to the decolmatation method involving implosion effect. An example of one of the existing installations is represented with following consideration of its application features. A new principally different installation, free from the disadvantages found in the available one, is considered; a patent for the installation is obtained in Kazakhstan. It does not involve tubing with its packer and wellhead sealing. It also does not require a compressor and its manifold. Characteristic features of the newly developed installation for creating implosion effect are represented; its operation at producing both single and any number of repeated implosion acts is examined. A mathematical analysis is performed to calculate the empty space limits required for the implosion effect by a criterion to prevent casing string collapse by hydrostatic pressure of the drilling mud remained in the annular space. An example of dependency of the maximum permitted length of empty space in the casing string on its mechanical strength and its wall thickness, calculated by means of a computer program, is represented.

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“…The sharply increased diameter of the well gives not only a large filtration area and a corresponding increase in flow rate, but also contributes to the installation of a powerful gravel filter that provides high-quality water purification, and a significant increase in the inter-repair life of the well [5,6].…”

Section: Introductionmentioning

confidence: 99%

Modeling of drilling water supply wells with airlift reverse flush agent circulation

Biletskiy¹,

Ratov²,

Sudakov³

et al. 2023

Nauk. visn. nat. hirn. univ.

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Purpose. Determination of the influence of mining and geological conditions of drilling hydrogeological wells with backwash on the technological parameters of the airlift method of cleaning it from drilled rock and the properties of the ascending flow of aerated washing liquids. Methodology. The tasks were solved by a complex research method, including analysis and generalization of literary and patent sources, analytical, experimental studies, using computer and mathematical modeling methods. Findings. An algorithm for the functioning of the airlift circulation method during rotary drilling with backwash has been developed. The algorithm takes into account: hydrostatic and hydrodynamic pressures, and the effect on them of the rate of drilling of the well; the effect of the sludge content in the upstream. The effective values of the airflow rate, the density of the water-air mixture and the velocity of its upward flow are established. A method for estimating the effective values of technological parameters and their changes in the upward flow of the mixture is proposed. A model has been developed that allows analyzing the dependences of the air flow rate, the density of the mixture and the rate of its ascent on the parameters of the well being drilled. The model is applied to typical drilling conditions of a large-diameter water intake well at the Samskoye groundwater deposit on the Mangystau peninsula. Originality. A mathematical algorithm has been developed for the functioning of the airlift backwash method when drilling large-diameter water intake wells. The method is based on the analysis of the pressure balance in the descending and ascending flows of the washing agent. For the case of backwash, a formula for estimating the content of sludge in it was obtained. A method has been developed for determining the average effective density of the mixture in terms of the height of the well, as well as the air content in it. Based on the average effective values, a method is proposed for estimating changes in the density of the mixture, its flow rate and velocity along the upward flow. Practical value. The proposed algorithm is the basis of a computer model that allows you to determine the dependences of the values of the density of the mixture, the content of air and sludge in it and the rate of ascent, from the depth of the well, the depth of the mixer descent, the speed of deepening, the specified velocity of the upward fluid flow, as well as the diameters of the well and drill pipes. Specific modeling results have been obtained in relation to the Samskoye groundwater deposit of the Mangystau peninsula.

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Effect of Geometry of Internal Crack-Like Defects on Assessing Trouble-Free Operation of Long-Term Operated Pipes of Drill String

Cited by 6 publications

References 9 publications

Determination of the thermal state of a block gravel filter during its transportation along the borehole

Determination of the thermal state of a block gravel filter during its transportation along the borehole

A new method of oil and water well completion involving the implosion effect

Modeling of drilling water supply wells with airlift reverse flush agent circulation

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