深层膏质泥岩蠕变特性及非线性蠕变模型研究

doi:10.16285/j.rsm.2017.2333

›› 2018, Vol. 39 ›› Issue (S1): 105-112.doi: 10.16285/j.rsm.2017.2333

深层膏质泥岩蠕变特性及非线性蠕变模型研究

张玉¹，王亚玲¹，俞缙²，张晓东¹，栾雅琳¹

1. 中国石油大学（华东）储运与建筑工程学院，山东青岛 266580； 2. 华侨大学福建省隧道与城市地下空间工程技术研究中心，福建厦门 361021

收稿日期:2017-11-12 出版日期:2018-07-20 发布日期:2018-09-02
通讯作者: 俞缙，男，1978年生，博士，教授，主要从事岩土与地下工程研究方面的工作。E-mail：bugyu0717@163.com E-mail:zhangyu@upc.edu.cn
作者简介:张玉，男，1985年生，博士，副教授，主要从事岩石力学与工程研究方面的工作
基金资助:
国家自然科学基金项目（No. 51679093）；青岛市应用基础研究计划项目（No. 17-1-1-33-jch）；中央高校基本科研业务费专项资金资助项目（No. 16CX05002A）；水能资源利用关键技术湖南省重点实验室开放研究基金项目（No. PKLHD201601）

Creep behavior and its nonlinear creep model of deep gypsum mudstone

ZHANG Yu¹, WANG Ya-ling¹, YU Jin², ZHANG Xiao-dong¹, LUAN Ya-lin¹

1. College of Pipeline and Civil Engineering, China University of Petroleum(East China), Qingdao, Shandong 266580, China; 2. Fujian Research Center for Tunneling and Urban Underground Space Engineering, Huaqiao University, Xiamen, Fujian 361021, China

Received:2017-11-12 Online:2018-07-20 Published:2018-09-02
Supported by:
This work was supported by the National Natural Science Foundation of China(51679093), the Applied Basic Research Programs of Qingdao(17-1-1-33-jch), the Fundamental Research Funds for the Central Universities(16CX05002A), and by the Open Research Fund of Hunan Provincial Key Laboratory of Hydropower Development Key Technology(PKLHD201601).

摘要/Abstract

摘要： 泥岩作为油气储层常见复杂介质，在深部高温、高压环境下蠕变力学特性异常复杂，是引起套管损伤破坏的重要因素。以深部油气藏工程含膏质泥岩为研究对象，首先开展了高温为130 ℃、高围压为30 MPa、不同偏应力水平下多试样、单级加载三轴蠕变试验。该泥岩呈显著的时效力学特性，蠕变应力阀值较低，应力和持时对蠕变特性存在显著影响，低应力、长时间作用下泥岩亦呈现明显的稳态蠕变和加速蠕变破坏，且加速蠕变起始时间随应力增加呈指数降低关系。其次探讨了泥岩加速蠕变和强度损伤特性，提出了蠕变损伤起始时间概念，认为泥岩内部蠕变损伤变量可用指数函数予以描述。最后，基于蠕变损伤变量和起始时间，构建考虑泥岩加速蠕变的非线性改进Burgers蠕变模型，对蠕变参数开展辨识和分析，所选模型可准确地对深层膏质泥岩蠕变特性进行描述。研究成果旨在为深部泥岩油气藏套管工程长期稳定分析及安全评价提供可靠的依据。

关键词: 油气储层, 膏质泥岩, 三轴蠕变试验, 加速蠕变破坏, 改进Burgers 蠕变模型

Abstract: Mudstone is widely used as the host rock medium in oil and gas reservoir. The creep behavior is extremely complex and directly influences the failure of casing under high temperature and high confining pressure. This study focuses on the gypsum mudstone in deep oil and gas reservoir engineering. Firstly, under 130 ℃ temperature and 30 MPa confining pressure, triaxial creep tests are performed under different deviatoric stress on multiple samples with a single-stage loading method. The mechanical behaviors of mudstone exhibit significant time-dependent and the creep stress threshold is small. The stress and duration has significant effects on creep behavior of mudstone. The steady creep and accelerated creep failure can be obtained under a long duration even in a small deviatoric stress. The start time of accelerated creep can be described as an exponential function of deviatoric stress; and the start time decreases with an increase in deviatoric stress. Secondly, the accelerated creep and strength damage characteristics of mudstone are discussed in detailed. The threshold of start time of creep damage is proposed. It is considered that the internal creep damage variable of mudstone can be described as an exponential function. Finally, based on the creep damage variable and the start time, the improved Burgers creep model is established. The model is nonlinear and can describe the accelerated creep stage. Then the creep parameters are identified and analyzed. The model can accurately describe the creep characteristics of the deep gypsum mudstone. The research results provide dependable reference for the safety evaluation and long term stability analysis of deep oil and gas reservoir engineering.

Key words: oil and gas reservoir, gypsum mudstone, triaxial creep tests, accelerated creep failure, improved Burgers creep model

中图分类号:

TU 452

张玉，王亚玲，俞缙，张晓东，栾雅琳，. 深层膏质泥岩蠕变特性及非线性蠕变模型研究[J]. , 2018, 39(S1): 105-112.

ZHANG Yu， WANG Ya-ling, YU Jin, ZHANG Xiao-dong, LUAN Ya-lin，. Creep behavior and its nonlinear creep model of deep gypsum mudstone[J]. , 2018, 39(S1): 105-112.

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深层膏质泥岩蠕变特性及非线性蠕变模型研究

Creep behavior and its nonlinear creep model of deep gypsum mudstone

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