地质力学学报2017，Vol.23Issue(6)：821-828,8.
天然气水合物注热开采近井储层变形破坏的数值模拟研究
NUMERICAL SIMULATION RESEARCH OF DEFORMATION AND FRACTURE OF THE FORMATION NEAR THE WELLBORE DURING THE HEAT INJECTION EXPLOITATION OF NATURAL GAS HYDRATES
摘要
Abstract
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.关键词
天然气水合物/注热开采/热流固耦合/近井储层/有效应力/等效塑性应变Key words
Natural Gas Hydrates/heat injection exploitation/thermo-hydro-mechanical coupled/the formation near wellbore/effective stress/equivalent plastic strain分类
能源科技引用本文复制引用
翟诚,孙可明,辛利伟,王婷婷..天然气水合物注热开采近井储层变形破坏的数值模拟研究[J].地质力学学报,2017,23(6):821-828,8.基金项目
国家自然科学基金项目(51574137) （51574137）
辽宁工业大学教师科研启动基金(X201403) （X201403）
