| 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 |
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| 引用本文： | 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. |
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| 作者姓名： | 翟诚 孙可明 辛利伟 王婷婷 |
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| 作者单位： | 辽宁工程技术大学力学与工程学院, 辽宁 阜新 123000;辽宁工业大学土木建筑工程学院, 辽宁 锦州 121001,辽宁工程技术大学力学与工程学院, 辽宁 阜新 123000,辽宁工程技术大学力学与工程学院, 辽宁 阜新 123000,辽宁工程技术大学力学与工程学院, 辽宁 阜新 123000 |
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| 基金项目： | 国家自然科学基金项目（51574137）；辽宁工业大学教师科研启动基金（X201403） |
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| 摘 要： | 为了研究海洋地层中天然气水合物注热开采条件下,水合物沉积层近井储层的力学性质变化规律和变形破坏规律,基于多场耦合理论,考虑水合物分解产生的水、气形成的超静孔隙压力对地层有效应力的影响,建立了能够反映水合物注热分解条件下水合物沉积层温度场、渗流场和变形场耦合作用关系的热流固耦合弹塑性模型,并以ABAQUS软件为开发平台,在Fortran语言环境下编制子程序进行数值模拟。结果表明:注热温度越高,近井储层力学性质劣化的区域与有效应力减小的幅度越大,发生塑性变形破坏的范围和产生的等效塑性应变值也越大;井口最小水平地应力方向的有效应力值最小,等效塑性应变值和体积应变值最大,是首先发生变形破坏的关键位置;井口同一位置的有效应力随注热温度的升高而减小,而体积应变则随注热温度的升高而增大。
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| 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 |
| 收稿时间： | 2016/11/17 0:00:00 |
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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| ZHAI Cheng,SUN Keming,XIN Liwei and WANG Tingting.NUMERICAL SIMULATION RESEARCH OF DEFORMATION AND FRACTURE OF THE FORMATION NEAR THE WELLBORE DURING THE HEAT INJECTION EXPLOITATION OF NATURAL GAS HYDRATES[J].Journal of Geomechanics,2017,23(6):821-828. |
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| Authors: | ZHAI Cheng SUN Keming XIN Liwei and WANG Tingting |
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| Institution: | School of Mechanics and Engineering, Liaoning Technical University, Fuxin 123000, Liaoning, China;School of Civil and Architectural Engineering, Liaoning University of Technology, Jinzhou 121001, Liaoning, China,School of Mechanics and Engineering, Liaoning Technical University, Fuxin 123000, Liaoning, China,School of Mechanics and Engineering, Liaoning Technical University, Fuxin 123000, Liaoning, China and School of Mechanics and Engineering, Liaoning Technical University, Fuxin 123000, Liaoning, China |
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| 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. |
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| Keywords: | Natural Gas Hydrates heat injection exploitation thermo-hydro-mechanical coupled the formation near wellbore effective stress equivalent plastic strain |
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