考虑固相分解的含水合物沉积物体积应变分析模型

袁思敏; 王路君; 朱斌; 陈云敏

doi:10.11779/CJGE202206008

考虑固相分解的含水合物沉积物体积应变分析模型 English Version

袁思敏^{1, 2, 3,},
王路君^{1, 2, 3, ,},
朱斌^{1, 2, 3},
陈云敏^{1, 2, 3}

1.
浙江大学软弱土与环境土工教育部重点实验室, 浙江杭州 310058
2.
浙江大学超重力研究中心, 浙江杭州 310058
3.
浙江大学岩土工程研究所, 浙江杭州 310058

基金项目:

国家自然科学基金基础科学中心项目 51988101

国家自然科学基金面上项目 52078458

浙江省自然科学基金重大项目 LCD19E090001

浙江省自然科学基金探索项目 LY21E080026

详细信息

作者简介:
袁思敏(1997—)，女，博士研究生，主要从事水合物沉积物基本特性研究。E-mail: yuansimin@zju.edu.cn

通讯作者:
王路君, E-mail: lujunwang@zju.edu.cn

中图分类号: TU43
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- 文章访问数: 205
- HTML全文浏览量: 22
- PDF下载量: 126
出版历程
- 收稿日期: 2021-06-16
- 网络出版日期: 2022-09-22
- 刊出日期: 2022-05-31

Volumetric strain analysis model for gas hydrate-bearing sediment considering effects of hydrate dissociation

YUAN Si-min^{1, 2, 3,},
WANG Lu-jun^{1, 2, 3, ,},
ZHU Bin^{1, 2, 3},
CHEN Yun-min^{1, 2, 3}

1.
Key Laboratory of Soft Soils and Geoenvironmental Engineering of the Ministry of Education, Zhejiang University, Hangzhou 310058, China
2.
Center for Hypergravity Experimental and Interdisciplinary Research, Zhejiang University, Hangzhou 310058, China
3.
Institute of Geotechnical Engineering, Zhejiang University, Hangzhou 310058, China

摘要

摘要: 水合物开采通过打破固相水合物相平衡状态使其分解为水和气体，含水合物沉积物（gas hydrate-bearing sediment, GHBS）固相组分减少使孔隙体积增大，土骨架间胶结作用弱化，产生的水和气显著改变孔隙压力，造成沉积物软化和体积收缩。基于GHBS三轴压缩试验，考虑水合物降压分解过程对GHBS变形特性的影响，将固相骨架分为惰性土骨架和可分解的水合物固相，引入随水合物饱和度变化的压缩参数，建立了能够描述GHBS应力和水合物分解耦合作用、体积应变随时间变化的分析模型。该模型能够描述降压速率、降压幅值及水合物分解速率对GHBS变形特性的影响，结果表明：降压速率增大，降压阶段体积应变速率增大，达到相平衡时间缩短，降压开采时应综合考虑开采过程中储层变形速率和开采效率间的关系；不同粒径组成的沉积物水合物分解速率存在差异，分解速率对储层变形速率影响明显；降压开采稳定孔压影响储层最终沉降量，降低稳定孔压可以提高开采效率，但最终变形量增大。
- 固相分解 /
- 水合物开采 /
- 水合物沉积物 /
- 体积应变 /
- 分析模型
Abstract: In the exploitation of gas hydrate, recovering methane from gas hydrate breaks the phase equilibrium state of hydrate and produces water and gas, which reduces the quality of the solid phase in the gas hydrate-bearing sediment (GHBS). Based on the triaxial tests as well as the mechanical properties of GHBS, the solid skeleton is divided into indecomposable soil skeleton and decomposable solid hydrate. The compression parameters of GHBS varying with hydrate saturation are introduced to establish an analysis model that can describe the coupling effects of stress, hydrate decomposition and variation of volumetric strain of GHBS with time during hydrate dissociation process. The proposed model can describe the effects of depressurization rate, pore pressure reduction and hydrate dissociation rate on deformation of GHBS. The numerical results show that with the increase of the depressurization rate, the volumetric strain rate increases in depressurization stage and the time to reach phase equilibrium decreases. The hydrate dissociation rate that has an obvious effect on the deformation rate of reservoir is different in sediments with different particle sizes. The stable pore pressure affects the final settlement of the reservoir, and reducing it can improve the efficiency of gas hydrate exploitation, however, the larger the reduction of pore pressure, the larger the volumetric strain.
- hydrate dissociation /
- gas hydrate exploitation /
- gas hydrate-bearing sediment /
- volumetric strain /
- analysis model

HTML全文

图 1 单元体应力状态随时间发展

Figure 1. Change of stress states with time in GHBS

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图 2 单元体降压分解过程体积应变路径

Figure 2. Volumetric strain paths of depressurization process in GHBS

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图 3 参数ε_∞确定

Figure 3. Determination method for parameter ε_∞

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水合物饱和度对GHBS临界状态线修正斜率 ${\chi _0}$ 的影响

Figure 4. Influences of hydrate saturation on slopes of critical state lines of GHBS

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图 5 参数C确定

Figure 5. Determination method for parameter C

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图 6 GHBS偏应力–体积应变曲线形态参数

Figure 6. Morphological parameters of q-ε_v curves of GHBS

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图 7 参数ε_∞确定

Figure 7. Determination method for parameter ε_∞

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图 8 本文模型模拟结果与Hyodo等^[13]试验对比

Figure 8. Comparison of results by proposed model and tests^[13]

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图 9 本文模型模拟结果与Choi等^[15]试验对比

Figure 9. Comparison of results by proposed model and tests^[15]

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图 10 降压速率D对体积应变的影响

Figure 10. Influence of depressurization rate D on volumetric strain of GHBS

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降压幅值 $\Delta u'$ 对体积应变的影响

Influences of pore pressure reduction $\Delta u'$ on volumetric strain of GHBS

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图 12 水合物分解速率C对体积应变的影响

Figure 12. Influences of hydrate dissociation rate C on volumetric strain of GHBS

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表 1 Hyodo等^[13]试验条件和试样参数

Table 1 Test conditions of Hyodo et al^[13]

试验名称	孔隙度/%	水合物饱和度/%	降压速率/(MPa·min^-1)	偏应力/MPa	孔隙压力/MPa	有效围压/MPa	平均有效主应力/MPa
D-K0-01	39.9	51.9	0.1	3	10→4.3→3.5	2→7.7→8.5	3→8.7→9.5
D-K0-04	39.9	50.1	0.5	3	10→4.3→3.5	2→7.7→8.5	3→8.7→9.5

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表 2 模型参数

Table 2 Model parameters of Hyodo et al

A	χ_∞	ε_∞	C/min^-1
0.1	0.057	0.04	0.056

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表 3 Choi等^[15]试验条件和试样参数

Table 3 Test conditions of Choi et al^[15]

试验名称	孔隙度/%	水合物饱和度/%	降压速率/(MPa·min^-1)	偏应力/MPa	孔隙压力/MPa	有效围压/MPa	平均有效主应力/MPa
^#2	37	40.4	0.024	1.5	5.52→3.36→3	0.69→2.85→3.21	1.19→3.35→3.71

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表 4 模型参数

Table 4 Model parameters of Choi et al^[15]

A	t₀/min	χ₀	χ_∞	ε_∞	C/min^-1
0.1	90	0.069	0.059	0.006	0.011

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