Volume 23 Issue 6
Dec.  2017
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ZHAI Cheng, SUN Keming, XIN Liwei, et al., 2017. NUMERICAL SIMULATION RESEARCH OF DEFORMATION AND FRACTURE OF THE FORMATION NEAR THE WELLBORE DURING THE HEAT INJECTION EXPLOITATION OF NATURAL GAS HYDRATES. Journal of Geomechanics, 23 (6): 821-828.
Citation: ZHAI Cheng, SUN Keming, XIN Liwei, et al., 2017. NUMERICAL SIMULATION RESEARCH OF DEFORMATION AND FRACTURE OF THE FORMATION NEAR THE WELLBORE DURING THE HEAT INJECTION EXPLOITATION OF NATURAL GAS HYDRATES. Journal of Geomechanics, 23 (6): 821-828.

NUMERICAL SIMULATION RESEARCH OF DEFORMATION AND FRACTURE OF THE FORMATION NEAR THE WELLBORE DURING THE HEAT INJECTION EXPLOITATION OF NATURAL GAS HYDRATES

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  • Received: 2016-11-17
  • Published: 2017-12-01
  • In order to study the variational law of mechanical property and the deformation and fracture law of the formation near the wellbore of hydrate bearing sediments under the heat injection exploitation condition of Natural Gas Hydrates which exist in the marine strata, basing on the multi-field coupling theory and taking into consideration the influence of excess pore pressure which is generated by water and methanegas of hydrates thermal dissociation on the effective stress of the stratum, the elastic-plastic model of thermo-hydro-mechanical coupled is established which can reflect the coupling effect relationship of temperature field, seepage field and deformation field under the heat injection decomposition condition of Natural Gas Hydrates.Then the subroutine is programmed in the Fortran language environment and the numerical simulation is carried out by the software of ABAQUS. The test results show that the degradation area of mechanical property and the decreasing extent of the effective stress are increased with the heat injection temperature. The higher the temperature, the greater the value of the plastic zone scope and the equivalent plastic strain.The minimum effective stress and the maximum equivalent plastic strain and the maximum volumetric strain in the direction of the minimal horizontal stress are in the position of wellhead. It is the key position where deformation and failure generate firstly. The effective stress value in the same wellhead location decreases with the increase of heat injection temperature; however, the volumetric strain increases with the increase of heat injection temperature.

     

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