摘要
热激法是分解水合物的重要方法,由于对水合物体系热物理参数变化特征缺少定量描述,现有的评价方法不能实现水合物热采效率的实时评价,缺少对热采过程中的热采效率变化特征的明确认识,将影响对水合物热采效率的正确评价。利用自制实验装置,开展不同间壁换热温度的天然气水合物热采实验,结合前人实验研究成果,利用数学统计方法,研究水合物体系热物理参数的定量变化特征,同时,结合热采实验的实时数据,利用不稳定传热理论,对天然气水合物间壁热采过程中的纯能量效率进行实时计算,实现了天然气水合物热采效率的实时评价。研究结果表明:在一定温度范围内,水合物体系的热物理参数与温度呈线性关系;天然气水合物间壁换热开采的纯能量效率为0~7,热采前期上升快,后期变缓;在热采初期,间壁温度越高,纯能量效率越高,随后趋势改变。热激法分解天然气水合物时,在热采初期采用较高温度,适时转换较低温度的变温热采模式,能够取得较好的水合物开采效果。
Thermal stimulation method is an important method for the decomposition of hydrates.Due to the lack of quantitative description of the changed characteristics of the thermal physical parameters of hydrate system,the existing evaluating methods can not realize real-time evaluation of hydrate thermal recovery efficiency,and the lack of clear understandings of the changed characteristics of recovery efficiency in the process of stimulation may affect the correct evaluation of hydrate thermal recovery efficiency.The thermal recovery experiments of the hydrate at different surface-exchanged temperatures are carried out with the help of self-designed equipment.Combined with previous studied achievements,by means of mathematical statistical method,the quantitative variation characteristics of the thermal physical parameters of hydrate system are researched.At the same time,integrated with the real-time thermal recovery and by means of unstable heat-transferring theory,the pure energy efficiency is calculated in the NGH surface-heat-exchange process,thus the real-time evaluation of thermal recovery efficiency is realized.The study results show that thermophysical parameters of hydrate system have a linear relationship with the temperature in a certain temperature range;the pure energy efficiency of the thermal recovery by surface heat exchanger is 0~7,which rises rapidly in the early stage of the thermal recovery and then slows down in the later stage.The higher the surface temperature is,the higher the pure energy efficiency will be,and then the trend is changed.When the natural gas hydrate is decomposed by thermal stimulation method,the higher temperature is used in the initial stage,and the temperature-changing thermal recovery model with lower temperature is converted at the appropriate time,which can achieve much better hydrate recovery effects.
作者
关富佳
周琴
李玉红
王鑫朋
卢美月
GUAN Fujia;ZHOU Qin;LI Yuhong;WANG Xinpeng;LU Meiyue(Petroleum Engineering School of Yangtze University,Wuhan 430100,China;Exploration and Development Research Institute of PetroChina Daqing Oilfield Co Ltd,Daqing 163712,China;Logging&Testing Services Company of PetroChina Daqing Oilfield Co Ltd,Daqing 163459,China;Tianjin Branch of CNOOC Ltd,Tianjin 300459,China)
出处
《大庆石油地质与开发》
CAS
CSCD
北大核心
2022年第1期148-154,共7页
Petroleum Geology & Oilfield Development in Daqing
基金
湖北省高等学校大学生创新创业训练项目“间壁换热开采天然气水合物实验研究”(2018323)。
关键词
天然气水合物
间壁换热
纯能量效率
实时评价
natural gas hydrate(NGH)
surface heat exchanger
pure energy efficiency
real-time evaluation
