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Logging evaluation on mechanical-damage characteristics of the vicinity of the wellbore in tight reservoirs.

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Title: Logging evaluation on mechanical-damage characteristics of the vicinity of the wellbore in tight reservoirs.
Authors: Ma, Tianshou1 (AUTHOR) matianshou@126.com, Gui, Junchuan2 (AUTHOR), Chen, Ping1 (AUTHOR)
Source: Journal of Petroleum Exploration & Production Technology. Aug2021, Vol. 11 Issue 8, p3213-3224. 12p.
Subject Terms: *Poisson's ratio, *Elastic waves, *Sand, *Elastic modulus, *Drilling muds, *Hydraulic fracturing, *Drilling fluids, *Data logging
Abstract: The rock mechanical behavior and damage characteristic is of great importance for in situ stress evaluation, wellbore stability analysis and hydraulic fracturing design. The velocities of elastic waves are usually reduced in the presence of rock damage, it may be used for determining the progressive damage of the rock. Therefore, this paper aims to investigate the damage characteristics of transversely isotropic tight sand formation, the rock mechanical and damage parameters in the vicinity of the wellbore were calculated using acoustic logging data. The results indicated that the Poisson's ratio and damage parameters decrease with increasing in radial distance, while the elastic modulus and Thomsen's coefficients increase. At the same radial position, the vertical elastic modulus is smaller than that of the horizontal, the degree of anisotropy for P-wave is greater than that of S-wave, and the horizontal damage parameter is greater than that of the vertical, which indicated that the micro-cracks near the wellbore mainly occur in the horizontal direction. The changes in mechanical parameters, Thomsen's coefficients and damage parameters rapidly changed in the range of 1.0–1.8 times of borehole radius. The variations of Thomsen's coefficients and damage parameters in mudstone are obviously greater than that of sandstone, which may be due to the induced damage between rocks and drilling fluid of mudstone is much higher than sandstone. [ABSTRACT FROM AUTHOR]
Database: Energy & Power Source
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Header DbId: enr
DbLabel: Energy & Power Source
An: 151819030
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  Label: Title
  Group: Ti
  Data: Logging evaluation on mechanical-damage characteristics of the vicinity of the wellbore in tight reservoirs.
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  Data: <searchLink fieldCode="AR" term="%22Ma%2C+Tianshou%22">Ma, Tianshou</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> matianshou@126.com</i><br /><searchLink fieldCode="AR" term="%22Gui%2C+Junchuan%22">Gui, Junchuan</searchLink><relatesTo>2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Chen%2C+Ping%22">Chen, Ping</searchLink><relatesTo>1</relatesTo> (AUTHOR)
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  Data: <searchLink fieldCode="JN" term="%22Journal+of+Petroleum+Exploration+%26+Production+Technology%22">Journal of Petroleum Exploration & Production Technology</searchLink>. Aug2021, Vol. 11 Issue 8, p3213-3224. 12p.
– Name: Subject
  Label: Subject Terms
  Group: Su
  Data: *<searchLink fieldCode="DE" term="%22Poisson's+ratio%22">Poisson's ratio</searchLink><br />*<searchLink fieldCode="DE" term="%22Elastic+waves%22">Elastic waves</searchLink><br />*<searchLink fieldCode="DE" term="%22Sand%22">Sand</searchLink><br />*<searchLink fieldCode="DE" term="%22Elastic+modulus%22">Elastic modulus</searchLink><br />*<searchLink fieldCode="DE" term="%22Drilling+muds%22">Drilling muds</searchLink><br />*<searchLink fieldCode="DE" term="%22Hydraulic+fracturing%22">Hydraulic fracturing</searchLink><br />*<searchLink fieldCode="DE" term="%22Drilling+fluids%22">Drilling fluids</searchLink><br />*<searchLink fieldCode="DE" term="%22Data+logging%22">Data logging</searchLink>
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: The rock mechanical behavior and damage characteristic is of great importance for in situ stress evaluation, wellbore stability analysis and hydraulic fracturing design. The velocities of elastic waves are usually reduced in the presence of rock damage, it may be used for determining the progressive damage of the rock. Therefore, this paper aims to investigate the damage characteristics of transversely isotropic tight sand formation, the rock mechanical and damage parameters in the vicinity of the wellbore were calculated using acoustic logging data. The results indicated that the Poisson's ratio and damage parameters decrease with increasing in radial distance, while the elastic modulus and Thomsen's coefficients increase. At the same radial position, the vertical elastic modulus is smaller than that of the horizontal, the degree of anisotropy for P-wave is greater than that of S-wave, and the horizontal damage parameter is greater than that of the vertical, which indicated that the micro-cracks near the wellbore mainly occur in the horizontal direction. The changes in mechanical parameters, Thomsen's coefficients and damage parameters rapidly changed in the range of 1.0–1.8 times of borehole radius. The variations of Thomsen's coefficients and damage parameters in mudstone are obviously greater than that of sandstone, which may be due to the induced damage between rocks and drilling fluid of mudstone is much higher than sandstone. [ABSTRACT FROM AUTHOR]
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RecordInfo BibRecord:
  BibEntity:
    Identifiers:
      – Type: doi
        Value: 10.1007/s13202-021-01200-7
    Languages:
      – Code: eng
        Text: English
    PhysicalDescription:
      Pagination:
        PageCount: 12
        StartPage: 3213
    Subjects:
      – SubjectFull: Poisson's ratio
        Type: general
      – SubjectFull: Elastic waves
        Type: general
      – SubjectFull: Sand
        Type: general
      – SubjectFull: Elastic modulus
        Type: general
      – SubjectFull: Drilling muds
        Type: general
      – SubjectFull: Hydraulic fracturing
        Type: general
      – SubjectFull: Drilling fluids
        Type: general
      – SubjectFull: Data logging
        Type: general
    Titles:
      – TitleFull: Logging evaluation on mechanical-damage characteristics of the vicinity of the wellbore in tight reservoirs.
        Type: main
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      – PersonEntity:
          Name:
            NameFull: Ma, Tianshou
      – PersonEntity:
          Name:
            NameFull: Gui, Junchuan
      – PersonEntity:
          Name:
            NameFull: Chen, Ping
    IsPartOfRelationships:
      – BibEntity:
          Dates:
            – D: 01
              M: 08
              Text: Aug2021
              Type: published
              Y: 2021
          Identifiers:
            – Type: issn-print
              Value: 21900558
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            – Type: volume
              Value: 11
            – Type: issue
              Value: 8
          Titles:
            – TitleFull: Journal of Petroleum Exploration & Production Technology
              Type: main
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