水合物储层砂体运移规律研究

doi:10.13722/j.cnki.jrme.2021.0881

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摘要水合物储层具有疏松、弱胶结或未胶结的特点，其骨架颗粒更细，这些因素导致在开发过程中水合物储层出砂问题更加复杂、严重，而出砂问题一直是制约水合物商业化开采最严重的挑战之一。根据南海神狐海域天然气水合物储层的特性，设计开展水合物出砂及其相关实验，探究水合物储层出砂规律，从而实现合理预测出砂量，为指导水合物开采中的有效防砂措施奠定基础。利用自主搭建的多场多尺度耦合实验平台，开展岩芯驱替出砂实验，使用核磁共振仪实时监测出砂过程中岩芯内部孔隙分布和结构变化，并及时收集产出砂，分析围压和流量对出砂速率和出砂的影响作用规律。基于水力侵蚀理论建立水合物储层出砂模型，根据出砂实验结果对模型参数进行反演。结果表明，水合物储层出砂主要受水流流速的影响，水流流量越大，出砂速率和出砂量越大；同时其出砂量与流量成线性相关，可以通过该出砂模型对出砂量进行有效预测。

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	王琳琳1
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	刘智强1
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	韩强1
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	余诗浍1
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关键词 ：岩石力学, 水合物储层, 出砂, 疏松, 核磁共振, 水力侵蚀模型

Abstract：Gas hydrate reservoirs are characterized by loose，weakly cemented，and the framework particles are finer，which causes the sand production more complicated and serious. Indeed，sand production is one of the most serious challenges restricting the efficient exploitation of gas hydrates. According to the gas hydrate reservoirs in the Shen hu area of the South China Sea，we design and carry out experiments of sand production to reveal the mechanism during the exploitation of gas hydrate，achieving predicting the sand production for fundament of taking effective sand control measures during hydrate exploitation. The self-built multi-field and multi-scale coupling experiment platform was used to carry out the core displacement sand production experiment. The nuclear magnetic resonance(NMR) instrument was used to monitor the pore distribution and structural changes in the core during the sand production process in real time. The produced sand is timely collected，the influence of flow rate on sand production rate and sand production are analyzed as well. Then，a sand production model for hydrate reservoirs is established based on the theory of hydraulic erosion，and the model parameters are calibrated according to the experiment data. The results show that the sand production is mainly affected by the water erosion. The greater the water flow，the greater the sand production rate and the amount of sand. Besides，the sand volume is linear with water flow，thus the sand production can be efficiently predicted by the established model.

Key words： rock mechanics hydrate sediments sand production looseness NMR hydraulic erosion model

引用本文:

王琳琳1，2，刘智强1，2，韩强1，2，余诗浍1，2. 水合物储层砂体运移规律研究[J]. 岩石力学与工程学报, 2022, 41(S2): 3517-3523.
WANG Linlin1，2，LIU Zhiqiang1，2，HAN Qiang1，2，YU Shihui1，2. Investigation on migration of sand in gas hydrate bearing sediments . , 2022, 41(S2): 3517-3523.

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http://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2021.0881 或 http://rockmech.whrsm.ac.cn/CN/Y2022/V41/IS2/3517

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