| 基于能量守恒定律对西原模型的改进与验证 |
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| 引用本文： | 张千贵,梁永昌,范翔宇,李广治,李纬韬,杨博仲,童盟. 基于能量守恒定律对西原模型的改进与验证[J]. 重庆大学学报(自然科学版), 2016, 39(3): 117-124. DOI: 10.11835/j.issn.1000-582X.2016.03.015 |
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| 作者姓名： | 张千贵 梁永昌 范翔宇 李广治 李纬韬 杨博仲 童盟 |
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| 作者单位： | 1. 西南石油大学油气藏地质及开发工程国家重点实验室,成都610500;重庆大学煤矿灾害动力学与控制国家重点实验室,庆400030;2. 西南石油大学油气藏地质及开发工程国家重点实验室,成都,610500;3. 重庆大学煤矿灾害动力学与控制国家重点实验室,庆400030;4. 中石油川庆钻探公司广汉钻采院,四川广汉,618300;5. 武汉三江航天远方科技有限公司,武汉,430030 |
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| 基金项目： | 国家自然科学基金资助项目(51474185);煤矿灾害动力学与控制国家重点实验室资助项目(2011DA105287-FW201203)。 |
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| 摘 要： | 在油气钻井工程中,由岩石蠕变引起的井眼缩径或井壁坍塌时有发生,本文基于能量守恒定律分析岩石蠕变的3个阶段,阐述传统的蠕变模型难以研究岩石加速蠕变阶段的原因。为此,在西原模型的基础上串联了一个绕组元件,建立改进西原模型及相应的本构方程。根据油气开发过程中所钻遇地层部分岩心的蠕变实验数据,对建立的改进西原模型进行验证,表明该模型能够很好地反映出岩石的蠕变特性,尤其是在岩石所受荷载大于长期强度的情况下,对凸显岩石加速蠕变阶段效果明显。该改进西原模型的提出可为进一步揭示岩石蠕变的客观规律提供理论依据。
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| 关 键 词： | 能量转换 岩石蠕变 西原模型 实验研究 模型验证 |
| 收稿时间： | 2016-02-12 |
A modified Nishihara model based on the law of the conservation ofenergy and experimental verification |
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| ZHANG Qiangui,LIANG Yongchang,FAN Xiangyu,LI Guangzhi,LI Weitao,YANG Bozhong and TONG Meng. A modified Nishihara model based on the law of the conservation ofenergy and experimental verification[J]. Journal of Chongqing University(Natural Science Edition), 2016, 39(3): 117-124. DOI: 10.11835/j.issn.1000-582X.2016.03.015 |
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| Authors: | ZHANG Qiangui LIANG Yongchang FAN Xiangyu LI Guangzhi LI Weitao YANG Bozhong TONG Meng |
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| Affiliation: | State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest PetroleumUniversity, Chengdu 610500, P. R. China;State Key Laboratory of Coal Mine Disaster Dynamicsand Control, Chongqing University, Chongqing 400030, P. R. China,State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest PetroleumUniversity, Chengdu 610500, P. R. China,State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest PetroleumUniversity, Chengdu 610500, P. R. China,State Key Laboratory of Coal Mine Disaster Dynamicsand Control, Chongqing University, Chongqing 400030, P. R. China,State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest PetroleumUniversity, Chengdu 610500, P. R. China,Drilling EngineeringAcademy of Technology, Chuanqing Drilling Engineering Co., Ltd. of CNPC, Guanghan 618300, Sichuan, P. R. China and Wuhan Sanjiang Hangtian Yuanfang TechnologyCo., Ltd., Wuhan 430030, P. R. China |
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| Abstract: | During the process of oil-gas drilling, the problems of wellbore instability, such as the shrinkage and the sloughing of borehole, usually happen because of rock creep. We first analyzed the three stages of rock creep based on the law of the conservation of energy and explained the reason why the traditional rock creep model cannot well describe the accelerating stage of rock creep. Then, we modified the Nishihara model and relevant constitutive equations by increasing a winding device. Some experimental results of several kinds of rocks forming different formations were used to validate the modified Nishihara model. The verification results indicate that this model can describe the creep characteristic of rock effectively. Especially the accelerating creep stage of rock can be simulated very well when the stress exceeds the long-term strength. This modified Nishihara model provides a theoretical foundation for revealing the objective law of the rock creep. |
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| Keywords: | energy conversion rock creep Nishihara model experimental study model validation |
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