Numerical study on gas production via a horizontal well from hydrate reservoirs with different slope angles in the South China Sea
Tingting Luo, Jianlin Song, Xiang Sun, Fanbao Cheng, Madhusudhan Bangalore Narasimha Murthy, Yulu Chen, Yi Zhao, Yongchen Song
中国南海海底蕴藏着丰富的天然气水合物，被视为未来能源的希望。然而，开采这些深海资源面临挑战，尤其是低渗透性泥质粉砂储层的特殊性，及其对开采技术和储层稳定性的高要求。坡角这一重要因素常被忽略。本研究首次系统分析了坡角对水平井水合物开采中储层沉降的影响，为大规模安全高效开采提供了科学指导。
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Tingting Luo, Jianlin Song, Xiang Sun, Fanbao Cheng, Madhusudhan Bangalore Narasimha Murthy, Yulu Chen, Yi Zhao, Yongchen Song. Numerical study on gas production via a horizontal well from hydrate reservoirs with different slope angles in the South China Sea. Deep Underground Science and Engineering. 2024; 3(2): 171-181. doi:10.1002/dug2.12103
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本文简介：
本研究凸显了探究水合物开采对中国南海低渗透泥质粉砂储层物理与力学特性影响的重要性，这对于水合物储层的大规模开发具有重要意义。尽管这一研究需求迫切，但迄今为止，关于坡角对水合物水平井开采过程中储层沉降影响的系统性研究尚未开展。为此，本研究采用了多物理场耦合模型，整合了实际勘探钻井数据与水合物岩心的力学实验数据，对5年内的水合物生产效应进行了深入分析。研究发现，储层的渗透性在很大程度上决定了气体产量，且在坡角较小的储层中观察到了最优的产气率。降压和水合物分解主要沿着坡面方向进行，而储层的平均有效应力则集中在井筒附近并随着坡角的增加而逐渐降低。储层沉降呈现出随坡角增加先减少后增加的非线性变化。特别地，对0°坡角的储层来说，5年水合物开采后其最大沉降量可达3.4米，这进一步凸显了在水合物开采过程中坡角与储层稳定性之间复杂的相互作用关系。
Brief Introduction：
The study underscores the significance of examining the effects of hydrate production on the physical and mechanical attributes of low-permeability clayey-silty reservoirs, which is vital for the extensive development of hydrate reservoirs in the South China Sea. Despite the need, the systematic examination of the impact of slope angle on reservoir settlement during hydrate production via horizontal wells has been lacking. To address this, the research employs a multi-physical field coupling model, integrating actual exploration drilling data and mechanical experiments of hydrate cores to scrutinize the effects over a 5-year period. The study's key findings indicate that permeability substantially influences gas production rates, with reservoirs featuring lower slope angles demonstrating superior yields. Depressurization and hydrate dissociation predominantly occur in alignment with the slope, while the mean effective stress is localized near the wellbore, diminishing as the slope angle increases. The settlement patterns exhibit an initial decrease followed by an increase with the increment of the slope angle. Notably, the maximum settlement in a 0° slope reservoir is 3.4 meters after five years, underscoring the intricate relationship between slope angle and reservoir stability during hydrate exploitation.
02
本文亮点：
预测了不同斜度的水合物储层对天然气开采的响应。
低渗透性将限制泥质粉砂储层的长期气体开采效率。
相对于斜坡储层，水平储层具有最高的气体产量和最大海底沉降量。
长期天然气开采过程中生产井筒存在损害的风险。
Highlights：
The response of hydrate reservoirs with various angle slopes to gas production is predicted.
Low permeability would limit the long‐term gas recovery rates of clayey reservoirs.
Reservoirs without slope angle show the highest gas production and seabed settlement.
There is a risk of potential damage of the production wellbore during long‐term gas production.
03
第一作者简介：
骆汀汀
骆汀汀，工学博士，副教授，硕士研究生导师。主要从事能源岩土力学和天然气水合物安全、高效开发的研究工作。
通讯作者简介：
宋建霖
宋建霖，硕士研究生。目前就读于中国矿业大学（徐州，江苏省）力学与土木工程学院，主修岩土工程。主要从事天然气水合物开采的研究工作。
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