Research on occurrence features and ways to improve the quality of productive hydrocarbon horizons demarcation

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Authors:


Ye.A.Koroviaka*, orcid.org/0000-0002-2675-6610, Dnipro University of Technology, Dnipro, Ukraine, e-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.

Ye.M.Stavychnyi, orcid.org/0000-0001-8583-2313, Public Joint-Stock Company “Ukrnafta”, Kyiv, Ukraine, e-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.

O.B.Martsynkiv, orcid.org/0000-0003-4583-5944, Ivano-Frankivsk National Technical University of Oil and Gas, Ivano-Frankivsk, Ukraine, e-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.

A.O.Ihnatov, orcid.org/0000-0002-7653-125X, Dnipro University of Technology, Dnipro, Ukraine, e-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.

A.V.Yavorskyi, orcid.org/0000-0003-4484-3723, Dnipro University of Technology, Dnipro, Ukraine, e-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.

* Corresponding author e-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.


повний текст / full article



Naukovyi Visnyk Natsionalnoho Hirnychoho Universytetu. 2024, (3): 005 - 011

https://doi.org/10.33271/nvngu/2024-3/005



Abstract:



Purpose.
On the base of the geological cross-section analysis of the productive stratum and the features of the filtration-capacitance characteristics of the reservoir rocks, to develop effective technological fastening schemes for the delimitation of closely located different-pressure and different-saturated horizons on the example of the Romny group deposits.


Methodology.
The proposed work is an analytical and production research on the geological-and-lithological structure features of borehole sections of the Romny structure and the results of their drilling and cementing based on the analysis of electrical, pulsed neutron-neutron, acoustic and other types of loggings. The data on the spectrum of the oil and gas boreholes properties cores was obtained on the basis of macroscopic description, methodical and practical methods of lithological, sedimentological, and facies analysis. The filtration capacity of permeable reservoir rocks was examined with the application of the Darcy’s device. Modern methods of experimental research analysis using mathematical and physical modeling techniques, methods for processing research results in SolidWorks, STATGRAPHICS, MATHSAD, EXCEL, control and measuring devices were applied.


Findings.
It has been established that currently applied fastening methods do not provide the prerequisites for high-quality delineation of productive horizons, as a result of which interlayer flows occur, that is lead to the loss of the potential flow rate of the boreholes and increasing in the cost of hydrocarbon production. A new design of the borehole is proposed in order to increase the reliability of the fastening. It has been proven that the effectiveness of opening oil-saturated reservoirs increases with the application of specialized drilling flushing fluids capable of minimizing the risk of their clogging. The necessity of cementing the production column and the shank with tamponage materials based on composite cements is substantiated, while effective buffer systems should be applied to separate process fluids.


Originality.
On the base of the systematization and correlation of the geophysical material, the specific features of the structure of the productive strata of B-18 and B-19 horizons were evaluated as well as the nature and degree of saturation, the filtration-capacity characteristics of the seams. It has been proven that in order to reliably cover the high-pressure water-bearing horizon B-18 with an operational column, it is recommended to include packer systems of various types of activation in the equipment.


Practical value.
On the basis of the detailed multifaceted results of laboratory and industrial testing and analytical model research, technological solutions have been developed for boreholes fastening in the conditions of the occurrence of closely located productive horizons of different pressures and different saturations on the example of the Romny group deposits.



Keywords:
borehole, core, casing, reservoir rock, cementing, productive horizon, packer

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