天然气水合物降压分解诱发储层变形破坏正交数值模拟实验研究

翟诚; 孙可明

doi:10.3969/j.issn.1006-6535.2022.01.015

特种油气藏 >

2022 , Vol. 29 >Issue 1: 99 - 106

DOI: https://doi.org/10.3969/j.issn.1006-6535.2022.01.015

油藏工程

天然气水合物降压分解诱发储层变形破坏正交数值模拟实验研究

翟诚 ,
孙可明

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1.山西工程技术学院,山西阳泉 045000;
2.辽宁工业大学,辽宁锦州 121001;
3.青岛理工大学,山东青岛 266520

翟诚(1981—),男,讲师,2005年毕业于辽宁工程技术大学理论与应用力学专业,2018年毕业于该校工程力学专业,获博士学位,现主要从事天然气水合物开采方面的研究工作。

收稿日期: 2020-10-22

修回日期: 2021-10-13

网络出版日期: 2023-01-10

基金资助

国家自然科学基金“超临界二氧化碳多脉冲气爆低渗透煤层抽采瓦斯增产机理研究”(51574137);山西工程技术学院教师科研启动基金“THM耦合作用下天然气水合物分解诱发储层变形破坏的机理研究”(2020QD-02);2021年第二批博士毕业生、博士后研究人员来晋工作奖励经费项目“THM耦合作用下天然气水合物分解诱发储层变形破坏的机理研究”(2021PT-13)

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Experimental Study with Orthogonal Numerical Simulation on Reservoir Deformation and Failure Induced by Depressurization and Decomposition of Natural Gas Hydrate

Zhai Cheng ,
Sun Keming

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1. Shanxi Institute of Technology, Yangquan, Shanxi 045000, China;
2. Liaoning University of Technology, Jinzhou, Liaoning, 121001, China;
3. Qingdao University of Technology, Qingdao, Shandong 266520, China

Received date: 2020-10-22

Revised date: 2021-10-13

Online published: 2023-01-10

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摘要

使用降压法进行天然气水合物开采时,天然气水合物沉积层的失稳破坏是制约其有效开发的关键因素。考虑水合物饱和度和有效应力同时变化对水合物沉积层主要力学参数的影响,建立天然气水合物降压分解诱发储层变形破坏的流固耦合弹塑性模型,编制USDFLD子程序,采用正交数值模拟实验方法,研究初始水合物饱和度、井底压力和有效主应力差对水合物沉积层近井储层变形破坏影响的敏感程度。结果表明:井底压力和有效主应力差是影响近井储层变形破坏的2个显著因素;对近井储层等效塑性应变最大值的影响程度由大到小依次为井底压力、有效主应力差、初始水合物饱和度;对塑性区范围的影响程度由大到小依次为有效主应力差、井底压力、初始水合物饱和度;建议根据水合物藏的地质条件,对井底压力进行优化设计。研究成果对采用降压法进行天然气水合物开采的安全性、可控性具有重要意义。

关键词： 天然气水合物; 降压分解; 水合物沉积层; 正交数值模拟实验; 等效塑性应变最大值; 塑性区范围

本文引用格式

翟诚 , 孙可明 . 天然气水合物降压分解诱发储层变形破坏正交数值模拟实验研究[J]. 特种油气藏, 2022 , 29(1) : 99 -106 . DOI: 10.3969/j.issn.1006-6535.2022.01.015

Abstract

In the exploitation of natural gas hydrate with depressurization method,the instability and failure of hydrate bearing sediment is a key factor restricting its effective development.Taking into account the effect of the simultaneous changes in hydrate saturation and effective stress on the main mechanical parameters of hydrate bearing sediment,a fluid-solid coupled elastoplastic model was established for the reservoir deformation and failure induced by depressurization and decomposition of natural gas hydrate,USDFLD subroutine was programmed,and a experimental method with orthogonal numerical simulation was adopted to study the sensitivity of initial hydrate saturation,downhole pressure and effective principal stress difference to the deformation and failure of hydrate bearing sediment near the well.The results demonstrated that the downhole pressure and the effective principal stress difference were two significant factors affecting the deformation and failure of the near-well reservoir,the effect on the maximum equivalent plastic strain of the near-well reservoir was descending in order of downhole pressure, effective principal stress difference and initial hydrate saturation,and the effect on the plastic range was descending in order of effective principal stress difference,downhole pressure and initial hydrate saturation.It is recommended to optimize the downhole pressure design according to the geological conditions of hydrate reservoir. The study results are of great significance to the safety and controllability of natural gas hydrate exploitation with depressurization method.

Key words： natural gas hydrate; depressurization and decomposition; hydrate bearing sediment; orthogonal numerical simulation experiment; maximum equivalent plastic strain; plastic area range

参考文献

[1] 石思思,陈星州,马健,等.南海北部神狐海域W19井天然气水合物储层类型与特征[J].特种油气藏,2019,26(3):24-29.
SHI Sisi,CHEN Xingzhou,MA Jian,et al.Natural gas hydrate reservoir classification and characterization in the Well W19 of Shenhu Sea Area,northern South China Sea[J].Special Oil & Gas Reservoirs,2019,26(3):24-29.
[2] 裴发根,何梅兴,仇根根,等.青藏高原冻土区AMT探测天然气水合物采集试验[J].物探与化探,2017,41(6):1113-1120.
PEI Fagen, HE Meixing, QIU Gengen,et al.AMT acquisition experimental study of gas hydrate exploration in the permafrost region of the Tibetan Plateau[J].Geophysical and Geochemical Exploration,2017,41(6):1113-1120.
[3] 邓磊,文志刚,刘蕴,等.漠河盆地漠河组天然气水合物潜在气源岩评价[J].特种油气藏,2015,22(5):33-38.
DENG Lei,WEN Zhigang,LIU Yun,et al.Evaluation of potential gas source rock of gas hydrate in Mohe Formation,the Mohe Basin[J].Special Oil & Gas Reservoirs,2015,22(5):33-38.
[4] VANNESTE M,SULTAN N,GARZIGLIA S,et al.Seafloor instabilities and sediment deformation processes:the need for integrated,multi-disciplinary investigations[J].Marine Geology,2014,352:183-214.
[5] 魏合龙,孙治雷,王利波,等.天然气水合物系统的环境效应[J].海洋地质与第四纪地质,2016,36(1):18-22.
WEI Helong,SUN Zhilei,WANG Libo,et al.Perspective of the environmental effect of natural gas hydrate system[J].Marine Geology & Quaternary Geology,2016,36(1):18-22.
[6] FREIJ-AYOUB R,TAN C,CLENNELL B,et al.A wellbore stability model for hydrate bearing sediments[J].Journal of Petroleum Science and Engineering,2007,57(2):209-220.
[7] KIMOTO S,OKA F,FUSHITA T,et al.A chemo-thermo-mechanically coupled numerical simulation of the deformation the subsurface ground deformation due to methane hydrate dissociation[J].Computers and Geotechnics,2007,34(4):216-228.
[8] KIMOTO S,OKA F,FUSHITA T.A chemo-thermo-mechanically coupled analysis of ground deformation induced by gas hydrate dissociation[J].International Journal of Mechanical Sciences,2010,52(2):365-376.
[9] QIU K,YAMAMOTO K,BRICHWOOD R,et al.Well-integrity evaluation for methane-hydrate production in the deepwater Nankai Trough[J].SPE Drilling & Completion,2015,30(1):52-67.
[10] 吴二林,魏厚振,颜荣涛,等.含天然气水合物沉积物分解过程的有限元模拟[J].岩土力学,2012,33(9):2811-2821.
WU Erlin,WEI Houzhen,YAN Rongtao,et al.FEM-based simulation of decomposition process of gas hydrate-bearing sediments[J].Rock and Soil Mechanics,2012,33(9):2811-2821.
[11] 沈海超,程远方,胡晓庆.天然气水合物藏降压开采近井储层稳定性数值模拟[J].石油钻探技术,2012,40(2):77-81.
SHEN Haichao,CHENG Yuanfang,HU Xiaoqing.Numerical simulation of near wellbore reservoir stability during gas hydrate production by depressurization[J].Petroleum Drilling Techniques,2012,40(2):77-81.
[12] 刘乐乐,鲁晓兵,张旭辉.天然气水合物分解区演化数值分析[J].石油学报,2014,35(5): 941-951.
LIU Lele,LU Xiaobing,ZHANG Xuhui.Numerical analysis on evolution of natural gas hydrate decomposition region in hydrate-bearing sediment[J].Acta Petrolei Sinica,2014,35(5): 941-951.
[13] 万义钊,吴能友,胡高伟,等.南海神狐海域天然气水合物降压开采过程中储层的稳定性[J].天然气工业,2018,38(4):117-128.
WAN Yizhao,WU Nengyou,HU Gaowei,et al.Reservoir stability in the process of natural gas hydrate production by depressurization in the Shenhu Area of the South China Sea[J].Natural Gas Industry,2018,38(4):117-128.
[14] 袁益龙,许天福,辛欣,等.海洋天然气水合物降压开采地层井壁力学稳定性分析[J].力学学报,2020,52(2):544-555.
YUAN Yilong,XU Tianfu,XIN Xin,et al.Mechanical stability analysis of strata and wellbore associated with gas production from oceanic hydrate-bearing sediments by depressurization[J].Chinese Journal of Theoretical and Applied Mechanics,2020,52(2):544-555.
[15] KIM H C,BISHNOI P R,HEIDEMANN R A.Kinetics of methane hydrate decomposition[J].Chemical Engineer Science,1987,42(7):1645-1653.
[16] YUN T S,SANTAMARINA J C,RUPPEL C.Mechanical properties of sand,silt,and clay containing tetrahydrofuran hydrate[J].Journal of Geophysical Research,2007,112(B4): B04106.
[17] 刘峰.南海北部陆坡天然气水合物分解引起的海底滑坡与环境风险评价[D].青岛:中国科学院海洋研究所,2010:82-83.
LIU Feng.Submarine landslides caused by gas hydrate dissociation and environmental risk assessment on the northern continental slope of South China Sea[D].Qingdao:Institute of Oceanology,Chinese Academy of Sciences,2010:82-83.
[18] SUN X,NANCHARY N,MOHANTY K K.1-D modeling of hydrate depressurization in porous media[J].Transport in Porous Media,2005,58(3):315-338.
[19] LIANG H F,SONG Y C,CHEN Y J.Numerical simulation for laboratory-scale methane hydrate dissociation by depressurization[J].Energy Conversion and Management,2010,51(10):1883-1890.
[20] 翟诚,孙可明,辛利伟,等.天然气水合物注热开采近井储层变形破坏的数值模拟研究[J].地质力学学报,2017,23(6): 821-828.
ZHAI Cheng,SUN Keming,XIN Liwei,et al.Numerical simulation research of deformation and fracture of the formation near the wellbore during the heat injection exploitation of natural gas hydrates[J].Journal of Geomechanics,2017,23(6):821-828.
[21] 刘洁,张建中,孙云宝,等.南海神狐海域天然气水合物储层参数测井评价[J].天然气地球科学,2017,28(1):164-172.
LIU Jie,ZHANG Jianzhong,SUN Yunbao,et al.Gas hydrate reservoir parameter evaluation using logging data in the Shenhu Area,South China Sea[J].Natural Gas Geoscience,2017,28(1):164-172.

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