International scientific journal

ISSN: 2663-0419 (electronic version)

ISSN: 2218-8754 (print version)

International scientific journal

ISSN: 2663-0419 (electronic version)

ISSN: 2218-8754 (print version)


A study of the stress state of rocks in the near-wellbore zone of the Middle Eocene sediments in the Tarsdallar deposit

Pashayev N.V., Pashayeva Sh.V.

Azerbaijan State Oil and Industry University 34, Azadlig ave., Baku, Azerbaijan, AZ1010:


The goal of geophysical well logging (GWL) is to assess the physical properties of rocks composing the studied section.
The solution of this problem is complicated by the fact that the properties of rocks in the well-bore zone differ from the unaltered part of the rock mass as a result of mechanical collapse of rock integrity during the drilling, redistribution of tension in the wellbore zone, and the formation of a permeable zone as a result of absorption of drilling mud into the reservoir. The research depth of most GWL methods does not extend beyond the limits of the permeability zone. The permeability zone differs from the unaltered part of the formation (beyond the wellbore wall) due to its physical properties. They affect the readings of GWL methods, distorting them in comparison with the results of measurements on models of homogeneous media. In this sense, it is of considerable interest to assess the stress state of rocks near the wellbore and the impact of this state on the physical characteristics of the rocks.
The paper provides recommendations on the necessity of stress state accounting of the near-wellbore zone to reduce errors in the quantitative interpretation of GWL data and to obtain reliable results. The analytical calculations of stresses are carried out to assess changes in the stress state of rocks in the near-wellbore zone over time. A numerical implementation of the approach and examples comparing the proposed approach with practical examples are given.

Keywords: lateral pressure, radial and azimuthal stress, wellbore zone, drilling mud, temperature stress



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DOI: 10.33677/ggianas20210200062