| 软泥岩井眼弹塑性变形的拉格朗日元法计算 |
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| 引用本文： | 邓金根,刘书杰,石得勤,张利.软泥岩井眼弹塑性变形的拉格朗日元法计算[J].地质力学学报,1999,5(1):35-39. |
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| 作者姓名： | 邓金根 刘书杰 石得勤 张利 |
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| 作者单位： | 1. 石油大学, 北京昌平 102200; |
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| 摘 要： | 首次将大变形原理引入井眼及其围岩弹塑性变形计算,应用拉格朗日元法对塑性泥页岩地层的井眼缩径问题进行分析求解。拉格朗日元法能够计算材料非线性和几何非线性问题,采用常用的摩尔-库仑强度准则对所选择的计算模型进行拉格朗日元分析计算,求解出井眼的收缩变形、井眼围岩位移场分布以及井眼围岩塑性区的分布规律。
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| 关 键 词： | 软泥岩 拉格朗日元 弹塑性变形 缩径 |
| 收稿时间： | 1998/2/15 0:00:00 |
| 修稿时间： | 1998-02-15 |
CALCULATION OF ELASTOPLASTIC DEFORMATION OF WELLBORE IN SOFT MUDSTONE USING LAGRANGIAN METHOD |
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| DENG Jingen,LIU Shujie,SHI Deqin and ZHANG Li.CALCULATION OF ELASTOPLASTIC DEFORMATION OF WELLBORE IN SOFT MUDSTONE USING LAGRANGIAN METHOD[J].Journal of Geomechanics,1999,5(1):35-39. |
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| Authors: | DENG Jingen LIU Shujie SHI Deqin and ZHANG Li |
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| Institution: | 1. Petroleum University, Changping Beijing 102200;2. Nationa Offshore Oil Production Research Center, BeiJing 101149;3. Daqing Drilling Technique Research Center, Daqing Heilongjiang 100083;4. National Patent Bureau, Beijing 100083 |
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| Abstract: | In this paper we presented a review on the current situation of mechanical stability of wellbore in mud-shale bed and for the first time introduced large deformation theory into the calculation of elastoplastic deformation of wellbore and adjacent rock.Using Lagrangian method, we analyzed the problem of borehole shrinkage in mud-shale bed. Lagrangian method could solve the problem of material nonlinearity and geometry nonlinearity.In this paper we analyzed the calculation model using Lagrangian method with commonly adapted Mohr-Coulomb strength criterion, and solved the problem of wellbore shrinkage, the displacement field and the plastic region distribution of the wellbore and its adjacent rock. |
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| Keywords: | soft mudstone Lagrangian method elastoplastic deformation wellbore shrinkage |
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