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学者姓名：吴学震
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Abstract ：
Multilateral horizontal wells (MHW) can enhance gas production by expanding the natural gas hydrate (NGH) decomposition area, but inevitably leading to larger changes in reservoir pressure and rock stresses, causing subsidence or disasters. Therefore, this study established a THMC model that evaluated the production effect and geomechanical response of MHW in Class-I reservoirs with different permeability and proposed a CO2 reinjection repair strategy to achieve subsidence recovery and carbon storage. Results indicate that MHW with vertical branch arrangements performs best in short-term production for low-permeability reservoirs, while the temperature and pressure evolution in high-permeability reservoirs is more drastic than in low-permeability reservoirs, producing many unfavorable factors. Higher capacity also results in larger strata subsidence and stress changes, affecting the reservoir stability and wellbore safety: (i) subsidence occurs mainly in the NGH sediment and the upper zone of the wellbore; (ii) normal stresses around the wellbore increase most significantly in the vertical direction, while shear stresses generally decrease. The repair indicators of subsidence recovery rate, energy recovery rate, and hydrate conversion rate suggest that reinjecting CO2 into depleted NGH reservoirs can improve the mechanical properties of the strata and achieve carbon storage via the hydrate method as well.
Keyword ：
CO 2 reinjection CO 2 reinjection Multilateral horizontal well Multilateral horizontal well Natural gas hydrate Natural gas hydrate Reservoir repair Reservoir repair Reservoir subsidence Reservoir subsidence THMC model THMC model
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| GB/T 7714 | Ye, Hongyu , Chen, Daoyi , Yao, Yuanxin et al. Exploration of production capacity-geomechanical evaluation and CO 2 reinjection repair strategy in natural gas hydrate production by multilateral horizontal wells [J]. | ENERGY , 2024 , 296 . |
| MLA | Ye, Hongyu et al. "Exploration of production capacity-geomechanical evaluation and CO 2 reinjection repair strategy in natural gas hydrate production by multilateral horizontal wells" . | ENERGY 296 (2024) . |
| APA | Ye, Hongyu , Chen, Daoyi , Yao, Yuanxin , Wu, Xuezhen , Li, Dayong , Zi, Mucong . Exploration of production capacity-geomechanical evaluation and CO 2 reinjection repair strategy in natural gas hydrate production by multilateral horizontal wells . | ENERGY , 2024 , 296 . |
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Available studies indicate that a multi-branch vertical well (MVW) may be the most appropriate well type for natural gas hydrate (NGH) exploitation, and the effect of branch parameters on gas production has been extensively explored. However, there is still a lack of systematic research and organization on how reservoir properties like reservoir types, porosity, and thickness affect gas production indexes. Consequently, we established Class 1-3 reservoir models and designed a series of cases to analyze the effect of reservoir properties on the exploitation with MVW. Results indicate that (i) MVW may be suitable for short-term production in Class 1 and Class 2 reservoirs and long-term production in the Class 3 reservoir, and the main well of MVW accounts for about 19% of gas production. (ii) It is preferable to locate the branches as close to the top of the reservoir as possible while maintaining reasonable spacing to capture the dissociated gas escaping from the lower reservoir. In addition, in Class 1 reservoirs, branches below the main well can capture free gas in the mixed layer. (iii) Reservoir parameters, including saturation, porosity, permeability, and thickness, make a significant difference in gas production, which provides an essential basis for further research by correlation analysis and polynomial fitting.
Keyword ：
Class 1-3 Class 1-3 Depressurization Depressurization Multi-branch vertical well Multi-branch vertical well Natural gas hydrate Natural gas hydrate Reservoir properties Reservoir properties
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| GB/T 7714 | Ye, Hongyu , Chen, Daoyi , Wu, Xuezhen et al. Systematic analysis of reservoir properties on gas recovery from natural gas hydrate by multi-branch vertical wells: Examples from the Shenhu Sea of China [J]. | GAS SCIENCE AND ENGINEERING , 2024 , 122 . |
| MLA | Ye, Hongyu et al. "Systematic analysis of reservoir properties on gas recovery from natural gas hydrate by multi-branch vertical wells: Examples from the Shenhu Sea of China" . | GAS SCIENCE AND ENGINEERING 122 (2024) . |
| APA | Ye, Hongyu , Chen, Daoyi , Wu, Xuezhen , Li, Dayong , Yu, Yisong , Zi, Mucong . Systematic analysis of reservoir properties on gas recovery from natural gas hydrate by multi-branch vertical wells: Examples from the Shenhu Sea of China . | GAS SCIENCE AND ENGINEERING , 2024 , 122 . |
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Abstract ：
深部岩体非线性大变形特性引发的岩爆灾害一直是岩土工程的世界性难题，严重制约了工程建设的施工进度和工程安全，加强对岩爆防治措施的深入研究刻不容缓。基于钢管挤压变形原理，提出了一种新型的缩管式恒阻大变形锚杆，该种锚杆可在容许较大的变形量的同时提供较高的恒阻力。在前期研究的基础上，通过落锤冲击试验探索了缩管式恒阻大变形锚杆的抗冲击性能。试验结果表明：在整个冲击过程中，缩管式恒阻大变形锚杆的工作阻力稳定在150～180 kN范围内，恒阻特性显著；缩管式恒阻大变形锚杆吸收能量大、效率高，单次可吸收冲击能量53 kJ；在冲击过程中，试件压缩率仅减小了0.54%～1.43%，变形情况较为稳定。缩管式恒阻大变形锚杆具有良好的抗冲击特能，可为地下工程建设过程中岩爆灾害的治理提供有力的技术支撑。
Keyword ：
岩爆 岩爆 恒阻力 恒阻力 抗冲击特性 抗冲击特性 缩管式恒阻大变形锚杆 缩管式恒阻大变形锚杆 落锤冲击试验 落锤冲击试验
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| GB/T 7714 | 赵明珠 , 吴学震 , 叶青 et al. 缩管式恒阻大变形锚杆抗冲击特性及其治理岩爆潜力研究 [J]. | 岩土力学 , 2024 , (11) . |
| MLA | 赵明珠 et al. "缩管式恒阻大变形锚杆抗冲击特性及其治理岩爆潜力研究" . | 岩土力学 11 (2024) . |
| APA | 赵明珠 , 吴学震 , 叶青 , 王刚 , 蒋宇静 , 邓涛 . 缩管式恒阻大变形锚杆抗冲击特性及其治理岩爆潜力研究 . | 岩土力学 , 2024 , (11) . |
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Sediment compression during submarine hydrate depressurization production causes changes in physical and mechanical characteristics, which in turn affects production results. In this paper, based on geological conditions of SHSC-4 well in Shenhu area, a theoretical model considering sediment compression effects is established by COMSOL, and the effects on the evolution of reservoir physical and mechanical characteristics within 60 days during depressurization production is simulated. The results show that model dimension effects can be ignored when the size l >= 100 m within 60 days. The effects of sediment compression on the physical characteristics of the reservoir are mainly realized by affecting the evolution of porosity, and the porosity reduction leads to permeability reduction. The larger the sediment compression coefficient, the higher the pore pressure in the reservoir. Sediment compression hinders the propagation of low pore pressure and heat transfer in the reservoir, which is unfavorable for hydrate decomposition favorable to hydrate reformation. A larger or smaller sediment compression coefficient selected in the simulation can lead to under- or over-estimate of reservoir gas production, so choosing an appropriate sediment compression coefficient when considering sediment compression is necessary for rational assessment of reservoir production behavior. In the production test site, when the production pressure is higher than 3 MPa, the pore pressure gradient is the key factor to promote gas production from the reservoir. When the production pressure is lower than 3 MPa, the sediment compression is the key factor to impede gas production from the reservoir.
Keyword ：
Depressurization production Depressurization production Natural gas hydrate Natural gas hydrate Numerical simulation Numerical simulation Physical and mechanical characteristics Physical and mechanical characteristics Sediment compression effects Sediment compression effects
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| GB/T 7714 | Jiang, Yujing , Ma, Xianzhuang , Luan, Hengjie et al. Numerical simulation on natural gas hydrate depressurization production considering sediment compression effects [J]. | ENERGY , 2024 , 301 . |
| MLA | Jiang, Yujing et al. "Numerical simulation on natural gas hydrate depressurization production considering sediment compression effects" . | ENERGY 301 (2024) . |
| APA | Jiang, Yujing , Ma, Xianzhuang , Luan, Hengjie , Wu, Xuezhen , Wang, Changsheng , Shan, Qinglin et al. Numerical simulation on natural gas hydrate depressurization production considering sediment compression effects . | ENERGY , 2024 , 301 . |
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In geotechnical engineering, activities such as landslides, rockfalls, blasting, and excavation often subject jointed rock masses to dynamic shear loads, impacting project stability. With continuous innovation of anchoring support technology, the appearance of energy-absorbing bolts has provided more options for rock support. This study selected fully-grouted bolts and energy-absorbing bolts, considering the roughness of natural rock joints. Indoor shear tests were conducted on bolted specimens at varying shear velocities. A comprehensive analysis was conducted on the failure morphology of joint surfaces and the fracture characteristics of bolts. Subsequently, the shear performance of both bolt types was quantitatively assessed through absorbed shear energy. At the interface between fully-grouted bolts and joint surfaces, stress concentration phenomena were observed. In contrast, energy-absorbing bolts exhibited significant necking phenomena. Under external forces, the bolt body detached from the grout, enabling it to accommodate large deformations of the rock mass and absorb energy. The results indicate that energy-absorbing bolts demonstrate better adaptability and energy absorption capacity under high-velocity shearing, while fully-grouted bolts exhibit higher peak shear stresses. Based on the experimental findings, for projects requiring consideration of dynamic shear loads and energy absorption capabilities, energy-absorbing bolts may be more suitable, providing additional safety assurance. Conversely, fully-grouted bolts may be more appropriate for applications with higher requirements for shear resistance, such as structural support under general static loads. © 2024
Keyword ：
Energy-absorbing bolt Energy-absorbing bolt Fully-grouted bolt Fully-grouted bolt Rock joints Rock joints Shear energy Shear energy Shear velocity Shear velocity
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| GB/T 7714 | Zheng, H. , Wu, X. , Jiang, Y. et al. Insights into velocity-dependent shear characteristics of bolted rock joints: A comparative study of fully-grouted and energy-absorbing bolts [J]. | International Journal of Rock Mechanics and Mining Sciences , 2024 , 183 . |
| MLA | Zheng, H. et al. "Insights into velocity-dependent shear characteristics of bolted rock joints: A comparative study of fully-grouted and energy-absorbing bolts" . | International Journal of Rock Mechanics and Mining Sciences 183 (2024) . |
| APA | Zheng, H. , Wu, X. , Jiang, Y. , Wang, G. , Li, B. . Insights into velocity-dependent shear characteristics of bolted rock joints: A comparative study of fully-grouted and energy-absorbing bolts . | International Journal of Rock Mechanics and Mining Sciences , 2024 , 183 . |
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The logging results from the Shenhu Sea show that the P-T conditions of NGH deposits are below the CO2 hydrate phase equilibrium curve. The burial depth difference between the CO2 hydrate stable zone and NGH deposits is usually above 100 m, which differs from the laboratory scale. Thus, whether CO2 hydrate caps can provide pore sealing and reinforcement of natural gas hydrate (NGH) overburden at the engineering scale is unknown. Based on this, we aimed to perfect research on the CO2 hydrate cap, including its formation process, effects on NGH exploitation, geomechanical response, and comprehensive benefit evaluation, by establishing a THMC model based on Site W17. Results indicate that (i) CO2 can form hydrates in the overburden layer with a conversion rate of about 28%, preventing the upward escape of residual liquid CO2 due to density difference. (ii) CO2 injection and CO2 hydrate cap formation can increase the decomposition driving force during depressurization to enhance production, but it fails to inhibit water invasion from the upper part of the NGH deposit due to the excessive depth difference. (iii) The CO2 hydrate cap causes strata uplift, thereby mitigating strata subsidence during depressurization production, especially for the cases of horizontal wells, where the subsidence is reduced by about 103.4%. (iv) Injecting too much CO2 may not benefit gas production, where part of the free gas will convert into NGH due to pressure rise. The optimal injection rate in this study is 40,000 m3/d. (v) Indicators like CO2 hydrate conversion rate, gas-water ratio, and maximum strata displacement show that horizontal well systems with CO2 hydrate caps are more beneficial than vertical well systems, and multi-branched well systems are more beneficial than single-direction well systems. These key findings may differ from the laboratory scale, which can provide a reference for applying CO2 hydrate caps in actual NGH exploitation. © 2024 Elsevier Ltd
Keyword ：
Horizontal wells Horizontal wells Hydrates Hydrates Injection (oil wells) Injection (oil wells) Natural gas well logging Natural gas well logging Natural gas well production Natural gas well production Natural gas wells Natural gas wells Petroleum reservoir evaluation Petroleum reservoir evaluation
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| GB/T 7714 | Ye, Hongyu , Yao, Yuanxin , Chen, Daoyi et al. How shallow CO2 hydrate cap affects depressurization production in deeper natural gas hydrate reservoirs: An example at Site W17, South China Sea [J]. | Journal of Cleaner Production , 2024 , 478 . |
| MLA | Ye, Hongyu et al. "How shallow CO2 hydrate cap affects depressurization production in deeper natural gas hydrate reservoirs: An example at Site W17, South China Sea" . | Journal of Cleaner Production 478 (2024) . |
| APA | Ye, Hongyu , Yao, Yuanxin , Chen, Daoyi , Chen, Jingyu , Wu, Xuezhen , Li, Dayong et al. How shallow CO2 hydrate cap affects depressurization production in deeper natural gas hydrate reservoirs: An example at Site W17, South China Sea . | Journal of Cleaner Production , 2024 , 478 . |
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Test exploitation equipment and technology have progressed considerably in marine natural gas hydrate (NGH) exploitation, but many critical technical issues still need to be resolved before commercial production. Previous studies have proposed a non-drilling exploitation device-a self-entry exploitation device (SEED)-but reaching the NGH commercial exploitation threshold in its initial state is difficult. Consequently, we verified and evaluated some production enhancement measures to improve the exploitation system of the SEED. In this study, based on the geological data from the SHSC-4 site in the Shenhu sea and the material characteristics of the SEED, we carried out four production enhancement measures by numerical simulation. The results indicate that: (i) open-hole position adjustment can expand the contact areas between the device and NGH reservoirs; (ii) the effect of inner wall heating is limited but sufficient to achieve the goal of preventing clogging; (iii) it is necessary to select a reasonable spacing according to a combination of expected production cycle time and pressure when carrying out clustered depressurization; and (vi) when performing depressurization combined with thermal stimulation exploitation, factors such as permeability and thermal conductivity play a decisive factor in gas production.
Keyword ：
clustered exploitation clustered exploitation depressurization depressurization heating heating natural gas hydrate natural gas hydrate open-hole open-hole production enhancement measure production enhancement measure self-entry exploitation device self-entry exploitation device thermal stimulation thermal stimulation
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| GB/T 7714 | Wang, Jianhua , Ye, Hongyu , Chen, Jingyu et al. Marine Natural Gas Hydrate Self-Entry Exploitation Device: Evaluation of Production Enhancement Measures [J]. | JOURNAL OF MARINE SCIENCE AND ENGINEERING , 2023 , 11 (3) . |
| MLA | Wang, Jianhua et al. "Marine Natural Gas Hydrate Self-Entry Exploitation Device: Evaluation of Production Enhancement Measures" . | JOURNAL OF MARINE SCIENCE AND ENGINEERING 11 . 3 (2023) . |
| APA | Wang, Jianhua , Ye, Hongyu , Chen, Jingyu , Huang, Qichao , Guo, Gaoqiang , Huang, Xuhong et al. Marine Natural Gas Hydrate Self-Entry Exploitation Device: Evaluation of Production Enhancement Measures . | JOURNAL OF MARINE SCIENCE AND ENGINEERING , 2023 , 11 (3) . |
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The current casing diameters of the production section are about 244 mm in marine natural gas hydrate (NGH) tried tests, which are a small order of magnitude and have the great potential to be enlarged. Expanding the contact areas between the wellbore and the NGH reservoir using complex structure wells has been popularly studied recently. In this study, the enlarged wellbore diameters (casing diameters) of complex structure wells were first proposed to enhance the gas recovery from the NGH reservoir in the Shenhu area of the South China Sea. The gas production characteristics, temperature, and pressure in the NGH reservoir and near the wellbore induced by the depressurization method were analyzed under various wellbore diameters of complex structure wells. Results indicate that using the enlarged wellbore diameter can further expand the contact areas between the wellbore and the NGH reservoir, promoting gas production efficiency, especially in short-term production. The evolutionary trends of temperature and pressure meet the conditions for stable short-and long-term pro-duction. Moreover, it was suggested that a relatively significant gas production increase of the enlarged wellbore diameter could be obtained by a slight increase in the wellbore diameter.
Keyword ：
Casing Casing Complex structure well Complex structure well Depressurization Depressurization Natural gas hydrate Natural gas hydrate Wellbore diameter Wellbore diameter
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| GB/T 7714 | Ye, Hongyu , Wu, Xuezhen , Guo, Gaoqiang et al. Application of the enlarged wellbore diameter to gas production enhancement from natural gas hydrates by complex structure well in the shenhu sea area [J]. | ENERGY , 2023 , 264 . |
| MLA | Ye, Hongyu et al. "Application of the enlarged wellbore diameter to gas production enhancement from natural gas hydrates by complex structure well in the shenhu sea area" . | ENERGY 264 (2023) . |
| APA | Ye, Hongyu , Wu, Xuezhen , Guo, Gaoqiang , Huang, Qichao , Chen, Jingyu , Li, Dayong . Application of the enlarged wellbore diameter to gas production enhancement from natural gas hydrates by complex structure well in the shenhu sea area . | ENERGY , 2023 , 264 . |
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吸力基础与海洋工程大直径钢桩相比,具有成本低、安装周期短、对环境影响小、不受海况影响及可回收再利用等优点,近年来在海上风电工程中得到推广应用.吸力基础沉贯至海床预定位置,是其发挥承载力和确保服役稳定性的前提.海床地基土体常以分层土形式分布,且各层土体强度、压缩性和渗透性等存在显著差别,导致吸力基础吸力沉贯机理非常复杂.明确吸力基础在分层土中沉贯特性,有助于指导吸力基础在海上风电工程中的推广应用.对目前吸力基础在分层土中沉贯特性研究进行综述和总结,归纳了其沉贯机理研究进展,并对影响吸力基础在分层土中沉贯因素进行了分析;提出了分层土中吸力基础沉贯的研究方向和改进的沉贯方法.
Keyword ：
分层土 分层土 吸力基础 吸力基础 吸力沉贯 吸力沉贯 沉贯机理 沉贯机理 海上风电 海上风电
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| GB/T 7714 | 李大勇 , 黄凌昰 , 张雨坤 et al. 海上风电吸力基础在分层土中的沉贯特性研究综述 [J]. | 海洋工程 , 2023 , 41 (1) : 110-127 . |
| MLA | 李大勇 et al. "海上风电吸力基础在分层土中的沉贯特性研究综述" . | 海洋工程 41 . 1 (2023) : 110-127 . |
| APA | 李大勇 , 黄凌昰 , 张雨坤 , 吴学震 . 海上风电吸力基础在分层土中的沉贯特性研究综述 . | 海洋工程 , 2023 , 41 (1) , 110-127 . |
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Many experiments have been performed to study the mechanical behavior of rock bolts in resisting the shear force. However, almost all the tests were conducted on smooth rock joints, which is inconsistent with the field engineering practice. In this paper, the shear behavior of fully encapsulated rock bolts and energy-absorbing rock bolts inserted in the rough joints was investigated with a series of single shear tests under constant normal load (CNL) conditions. For all specimens, when the value of JRC increases gradually, the value of peak shear stress increases gradually. The ultimate shear displacement of an energy-absorbing rock bolt is larger than that of a fully encapsulated rock bolt for the same JRC condition, and they all decrease with the increase of JRC. The sensitivity of the energy-absorbing bolt to JRC change is lower than a fully encapsulated rock bolt. A dimen-sionless mathematical model was established to predict the ultimate shear displacement of rock bolts inserted in different roughness conditions. The ultimate shear displacement of the rock bolt was evaluated as a linear function of JRC. Two tests with natural rough joints were conducted to verify the applicability of the proposed empirical model for the natural rough joints. The predicted values of the ultimate shear displacement of rock bolts indicated good agreement with the test results. The proposed model is capable of providing an accurate evaluation of the ultimate shear displacement of rock bolts inserted in rough joints. The results of the laboratory test and mathematical model all show that the energy-absorbing bolt can bear a larger shear displacement and adapt to different joint roughness.
Keyword ：
Empirical model Empirical model Energy-absorbing rock bolt Energy-absorbing rock bolt Fully encapsulated rock bolt Fully encapsulated rock bolt Joint roughness coefficient Joint roughness coefficient Shear displacement Shear displacement
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| GB/T 7714 | Wu, Xuezhen , Zheng, Hanfang , Jiang, Yujing . Influence of joint roughness on the shear properties of energy-absorbing bolt [J]. | INTERNATIONAL JOURNAL OF ROCK MECHANICS AND MINING SCIENCES , 2023 , 163 . |
| MLA | Wu, Xuezhen et al. "Influence of joint roughness on the shear properties of energy-absorbing bolt" . | INTERNATIONAL JOURNAL OF ROCK MECHANICS AND MINING SCIENCES 163 (2023) . |
| APA | Wu, Xuezhen , Zheng, Hanfang , Jiang, Yujing . Influence of joint roughness on the shear properties of energy-absorbing bolt . | INTERNATIONAL JOURNAL OF ROCK MECHANICS AND MINING SCIENCES , 2023 , 163 . |
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