| Pore pressure and stress distribution analysis around an inclined wellbore in a transversely isotropic formation based on the fully coupled chemo-thermo-poroelastic theory | |
Cao WK; Deng JG; Liu W; Yu BH; Tan Q; Yang L(杨柳); Li Y; Gao JJ ; Liu, W (reprint author), China Univ Petr, State Key Lab Petr Resources & Prospecting, Beijing 102249, Peoples R China.
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| Source Publication | JOURNAL OF NATURAL GAS SCIENCE AND ENGINEERING
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| 2017-04-01 | |
| Volume | 40Pages:24-37 |
| ISSN | 1875-5100 |
| Abstract | Wellbore instability is a widespread problem when drilling in shale formations particularly with water based drilling fluid. The main reason for the occurrence of wellbore instability is that stress concentration and pore pressure redistribution occur around the wellbore once a hole is drilled; current studies show that the drilling fluid temperature and solute mass fraction play important roles during the process. In this work a non-linear fully coupled chemo-thermo-poroelastic finite element model is developed to quantitatively access thermal and chemical effects on time-dependent pore pressure and effective stresses; in addition material constant sensitivity analysis of an inclined well drilled in a transversely isotropic formation is presented. The results reveal the following: fluid transfer is greatly affected by thermal and chemical osmosis the lower temperature and higher solute mass fraction of the drilling fluid contribute to decreasing the pore pressure and are beneficial for wellbore stability and thermal parameters (such as thermal osmosis coefficient and thermal diffusivity) and chemical parameters (such as reflection coefficient and solute diffusion coefficient) have high effects on the pore pressure and effective stresses. Anisotropy ratio analysis of the material constants indicates that the pore pressure and effective stresses are very sensitive to Young's modulus and the permeability ratio but are not sensitive to Poisson's ratio. Therefore the developed coupled chemo-thermo-poroelastic theory illustrates that optimization of the reduction of the drilling fluid temperature while maintaining a high solute mass fraction could enhance wellbore stability. (C) 2017 Elsevier B.V. All rights reserved. |
| Keyword | Chemo-thermo-poroelastic Fully Coupled Finite Element Wellbore Stability Shale |
| DOI | 10.1016/j.jngse.2017.02.002 |
| Indexed By | SCI ; EI |
| Language | 英语 |
| WOS ID | WOS:000397691300003 |
| WOS Keyword | BOUNDARY-ELEMENT METHOD ; BOREHOLE ; ROCKS ; MEDIA ; WATER |
| WOS Research Area | Energy & Fuels ; Engineering |
| WOS Subject | Energy & Fuels ; Engineering, Chemical |
| Funding Organization | Natural Science Foundation of China(11502304 ; National Basic Research Program of China(2015CB251202) ; Science Foundation of China University of Petroleum Beijing(C201601 ; 51521063) ; 2462013YJRCO23) |
| Classification | 二类 |
| Ranking | 5+ |
| Citation statistics | |
| Document Type | 期刊论文 |
| Identifier | http://dspace.imech.ac.cn/handle/311007/60565 |
| Collection | 流固耦合系统力学重点实验室 |
| Corresponding Author | Liu, W (reprint author), China Univ Petr, State Key Lab Petr Resources & Prospecting, Beijing 102249, Peoples R China. |
| Recommended Citation GB/T 7714 | Cao WK,Deng JG,Liu W,et al. Pore pressure and stress distribution analysis around an inclined wellbore in a transversely isotropic formation based on the fully coupled chemo-thermo-poroelastic theory[J]. JOURNAL OF NATURAL GAS SCIENCE AND ENGINEERING,2017,40:24-37. |
| APA | Cao WK.,Deng JG.,Liu W.,Yu BH.,Tan Q.,...&Liu, W .(2017).Pore pressure and stress distribution analysis around an inclined wellbore in a transversely isotropic formation based on the fully coupled chemo-thermo-poroelastic theory.JOURNAL OF NATURAL GAS SCIENCE AND ENGINEERING,40,24-37. |
| MLA | Cao WK,et al."Pore pressure and stress distribution analysis around an inclined wellbore in a transversely isotropic formation based on the fully coupled chemo-thermo-poroelastic theory".JOURNAL OF NATURAL GAS SCIENCE AND ENGINEERING 40(2017):24-37. |
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| JouAr-2017-056.pdf（3599KB） | 期刊论文 | 作者接受稿 | 开放获取 | CC BY-NC-SA | View Download | |
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