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Development and verification of the comprehensive model for physical properties of hydrate sediment

  • Qingchao Li
  • Yuanfang Cheng
  • Qiang Li
  • Ubedullah Ansari
  • Yuwen Liu
  • Chuanliang Yan
  • Chuang Lei
Original Paper
  • 89 Downloads

Abstract

Natural gas hydrate is widely distributed all over the world and may be a potential resource in the near future, whereas hydrate dissociation during the development affects wellbore stability and drilling safety. However, the present modeling of hydrate reservoir parameters ignored the influence of effective stress and only considered the hydrate saturation. In this paper, a series of stress sensitivity experiments for the unconsolidated sandstone were carried out, and the influence of mean effective stress on physical parameters was obtained; a comprehensive model for the physical parameters of hydrate reservoir was developed subsequently. With the help of ABAQUS finite element software, the established comprehensive model was verified by the use of the wellbore stability numerical model of hydrate reservoir. The verification results show that ignoring the effect of mean effective stress on the parameters of hydrate formation aggravates the invasion of drilling fluid into the hydrate formation. Besides, ignoring the stress sensitivity of reservoir physical parameters will underestimate the wellbore instability during hydrate drilling, which will be a threat to the safety of gas hydrate drilling. At the end of the drilling operation, the maximum plastic strain of the model for considering and not considering stress sensitivity was 0.0145 and 0.0138, respectively. Therefore, the established comprehensive model will provide a theoretical support for accurately predicting the engineering geological disasters in hydrate development process.

Keywords

Stress sensitivity Wellbore stability Hydrate dissociation Finite element simulation Coupling of multi-physics fields 

Notes

Acknowledgements

This work was supported by Program for the Changjiang Scholars and Innovative Research Team in University (IRT_14R58) , the National Natural Science Foundation Project of China (51704311), the Fundamental Research Funds for the Central Universities (Grant No. 16CX06033A), National Key Research and Development Program (Grant No. 2016YFC0304005), the National Basic Research Program of China (973 Program) (Grant No. 2015CB251201), and Qingdao Science and Technology Project (Grant No. 15-9-1-55-jch).

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Copyright information

© Saudi Society for Geosciences 2018

Authors and Affiliations

  • Qingchao Li
    • 1
  • Yuanfang Cheng
    • 1
  • Qiang Li
    • 1
  • Ubedullah Ansari
    • 1
  • Yuwen Liu
    • 1
  • Chuanliang Yan
    • 1
  • Chuang Lei
    • 1
    • 2
  1. 1.School of Petroleum EngineeringChina University of Petroleum (East China)QingdaoChina
  2. 2.PetroChina Huabei Oilfield CompanyRenqiuChina

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