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Numerical investigation of gas‐liquid displacement between borehole and gassy fracture using response surface methodology.

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Title: Numerical investigation of gas‐liquid displacement between borehole and gassy fracture using response surface methodology.
Authors: Ma, Tianshou1 (AUTHOR) matianshou@126.com, Tang, Tao1 (AUTHOR), Chen, Ping1 (AUTHOR) chenping@swpu.edu.cn, Li, Zhilin1,2 (AUTHOR), Liu, Shaohu1,3 (AUTHOR)
Source: Energy Science & Engineering. Mar2020, Vol. 8 Issue 3, p740-754. 15p.
Subject Terms: *Gas condensate reservoirs, *Drilling fluids, *Computational fluid dynamics, *Drilling muds, *Gas reservoirs, *Investigations
Abstract: Gas‐liquid displacement occurs often in fractured gas reservoirs, and can cause gas kick and mud leakage, resulting in a very high risk of losing well control. To analyze gas‐liquid displacement between borehole and gassy fracture, we used computational fluid dynamics to simulate its behaviors. We also used response surface methodology (RSM) to design numerical experiments. The effects of fracture width, bottom‐hole differential pressure, mud density, mud viscosity, and mud displacement were taken into account. We used RSM to determine the influence of the multifactor interaction of gas‐liquid displacement and established an empirical formula for the gas displacement rate. The results show that gas‐liquid displacement is proportional to fracture width, bottom‐hole differential pressure, mud density, and mud displacement; however, the displacement is inversely proportional to mud viscosity. The sensitivity sequence of the gas‐liquid displacement rate is fracture width > bottom‐hole differential pressure > mud viscosity > mud density > mud velocity. The impact of fracture width is clearly higher than that of the other factors, while the mud velocity has almost no impact. Our established empirical formula can be used to predict bottom‐hole gas kick and drilling mud leakage and to inversely predict the fracture width and formation gas pressure. [ABSTRACT FROM AUTHOR]
Database: Energy & Power Source
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Header DbId: enr
DbLabel: Energy & Power Source
An: 142082138
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Items – Name: Title
  Label: Title
  Group: Ti
  Data: Numerical investigation of gas‐liquid displacement between borehole and gassy fracture using response surface methodology.
– Name: Author
  Label: Authors
  Group: Au
  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="%22Tang%2C+Tao%22">Tang, Tao</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Chen%2C+Ping%22">Chen, Ping</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> chenping@swpu.edu.cn</i><br /><searchLink fieldCode="AR" term="%22Li%2C+Zhilin%22">Li, Zhilin</searchLink><relatesTo>1,2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Liu%2C+Shaohu%22">Liu, Shaohu</searchLink><relatesTo>1,3</relatesTo> (AUTHOR)
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  Label: Source
  Group: Src
  Data: <searchLink fieldCode="JN" term="%22Energy+Science+%26+Engineering%22">Energy Science & Engineering</searchLink>. Mar2020, Vol. 8 Issue 3, p740-754. 15p.
– Name: Subject
  Label: Subject Terms
  Group: Su
  Data: *<searchLink fieldCode="DE" term="%22Gas+condensate+reservoirs%22">Gas condensate reservoirs</searchLink><br />*<searchLink fieldCode="DE" term="%22Drilling+fluids%22">Drilling fluids</searchLink><br />*<searchLink fieldCode="DE" term="%22Computational+fluid+dynamics%22">Computational fluid dynamics</searchLink><br />*<searchLink fieldCode="DE" term="%22Drilling+muds%22">Drilling muds</searchLink><br />*<searchLink fieldCode="DE" term="%22Gas+reservoirs%22">Gas reservoirs</searchLink><br />*<searchLink fieldCode="DE" term="%22Investigations%22">Investigations</searchLink>
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: Gas‐liquid displacement occurs often in fractured gas reservoirs, and can cause gas kick and mud leakage, resulting in a very high risk of losing well control. To analyze gas‐liquid displacement between borehole and gassy fracture, we used computational fluid dynamics to simulate its behaviors. We also used response surface methodology (RSM) to design numerical experiments. The effects of fracture width, bottom‐hole differential pressure, mud density, mud viscosity, and mud displacement were taken into account. We used RSM to determine the influence of the multifactor interaction of gas‐liquid displacement and established an empirical formula for the gas displacement rate. The results show that gas‐liquid displacement is proportional to fracture width, bottom‐hole differential pressure, mud density, and mud displacement; however, the displacement is inversely proportional to mud viscosity. The sensitivity sequence of the gas‐liquid displacement rate is fracture width > bottom‐hole differential pressure > mud viscosity > mud density > mud velocity. The impact of fracture width is clearly higher than that of the other factors, while the mud velocity has almost no impact. Our established empirical formula can be used to predict bottom‐hole gas kick and drilling mud leakage and to inversely predict the fracture width and formation gas pressure. [ABSTRACT FROM AUTHOR]
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RecordInfo BibRecord:
  BibEntity:
    Identifiers:
      – Type: doi
        Value: 10.1002/ese3.547
    Languages:
      – Code: eng
        Text: English
    PhysicalDescription:
      Pagination:
        PageCount: 15
        StartPage: 740
    Subjects:
      – SubjectFull: Gas condensate reservoirs
        Type: general
      – SubjectFull: Drilling fluids
        Type: general
      – SubjectFull: Computational fluid dynamics
        Type: general
      – SubjectFull: Drilling muds
        Type: general
      – SubjectFull: Gas reservoirs
        Type: general
      – SubjectFull: Investigations
        Type: general
    Titles:
      – TitleFull: Numerical investigation of gas‐liquid displacement between borehole and gassy fracture using response surface methodology.
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          Name:
            NameFull: Ma, Tianshou
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            NameFull: Tang, Tao
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            NameFull: Chen, Ping
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            NameFull: Li, Zhilin
      – PersonEntity:
          Name:
            NameFull: Liu, Shaohu
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          Dates:
            – D: 01
              M: 03
              Text: Mar2020
              Type: published
              Y: 2020
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              Value: 20500505
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              Value: 8
            – Type: issue
              Value: 3
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            – TitleFull: Energy Science & Engineering
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