摘要
针对热激法开采过程中水合物分解界面变化影响水合物安全高效开采的问题,运用实验分析、理论研究和数值模拟相结合的方法,自制水合物加热分解界面测量实验装置,进行不同初始饱和度水合物加热开采过程中分解界面变化的实验研究,并通过数值模拟进一步分析温度对水合物分解界面的影响。研究表明:水合物分解界面移动距离与初始饱和度之间近似呈线性负相关关系,与其作用时间的算术平方根近似呈线性正相关关系;水合物分解界面的移动速率先快后慢,速率下降幅度为80%;初始饱和度是影响水合物藏开采效率的重要参数之一;适当升高加热温度有利于加快开采过程中水合物分解界面移动速率。合理控制水合物开采过程中分解界面的移动距离和移动速率对水合物藏安全高效开采有实践性指导意义。
Laboratory experiment, theoretical analysis and numerical simulation are used to study the challenge of natural gas hydrate safe and efficient recovery results from the hydrate decomposition interface variation during ther- mal activation recovery. An experiment device to measure the natural gas hydrate heating decomposition interface is developed and used to test the decomposition interface with different natural gas hydrate saturation. The influence of temperature on the natural gas hydrate decomposition interface is further analyzed by numerical simulation. Result indicates that the moving distance of natural gas hydrate decomposition interface shows a negative linear correlation with its initial saturation and a positive linear correlation with the arithmetic square root of interaction time. The nat- ural gas hydrate decomposition interface moves fast at the initial stage and then slows down, and the corresponding decrease rate is 80%. The development of natural gas hydrate reservoir is greatly dependent on its initial saturation. Proper temperature increase is beneficial to accelerate the moving rate of natural gas hydrate decomposition interface during the recovery process. Reasonable control of the moving distance and moving rate of the natural gas hydrate decomposition interface could provider certain practical guidance for the safe and efficient development of natural gas hydrate reservoir.
作者
孙可明
王婷婷
翟诚
辛利伟
范楠
Sun Keming;Wang Tingting;Zhai Cheng;Xin Liwei;Fan Nan(Liaoning Technical University,Fuxin,Liaoning 123000,China;Liaoning University of Technology,Jinzhou,Liaoning 121001,China)
出处
《特种油气藏》
CAS
CSCD
北大核心
2018年第5期129-134,共6页
Special Oil & Gas Reservoirs
基金
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)
关键词
天然气水合物
热激法开采
分解界面
初始饱和度
移动距离
移动速率
加热参数
natural gas hydrate
thermal activation recovery
decomposition interface
initial saturation
moving distance
moving rate
heating parameter
