垂直井压裂联合降压开采天然气水合物的产能数值模拟  

Numerical simulation on production capacity of natural gas hydrate produced by vertical well fracturing combined with depressurization

作　　者：王文博 崔伟 夏斐 王建强 WANG Wen-Bo;CUI Wei;XIA Fei;WANG Jian-Qiang

机构地区：[1]山东工程职业技术大学,山东济南250000 [2]三峡能源海上风电运维江苏有限公司,江苏盐城224000 [3]山东现代学院,山东济南250104

出　　处：《节能》2023年第9期30-33,共4页Energy Conservation

摘　　要：为了探究高效的水合物开采工艺方法,建立压裂法联合降压开采水合物的基本物理模型和数学模型,应用2017年神狐海域试开采数据,验证并完善该模型计算结果的正确性。分析比较水合物储层在考虑压裂和不考虑压裂时,井中压力、水合物饱和度、分解过渡带的移动规律,研究开采井压力、裂缝长度、裂缝渗透率、裂缝孔隙度对水合物产气速率和累计产气的影响。结果显示:开采井压力越低,水合物分解速度越快,累计产气量越高;当开采井压力一定时,水合物的产气速率、累计产气量随着裂缝长度、裂缝渗透率和孔隙度的增加而增加。压裂联合降压可以提高水合物的开采效率,为今后水合物实现商业化开采提供参考。In order to explore the efficient hydrate production technology,the basic physical model and mathematical model for hydraulic fracturing combined with depressurization for hydrate extraction were established,and the trial production data of 2017 Shenhu Sea were applied to verify and improve the correctness of the calculation results of the model.The movement patterns of wellbore pressure,hydrate saturation and decomposition transition zone in hydrate reservoirs with and without fracturing were analyzed and compared.The effects of well pressure,fracture length,fracture permeability and fracture porosity on hydrate gas production rate and cumulative gas production were studied.The results show that the lower the pressure of the mining well,the faster the decomposition rate of hydrates,and the higher the cumulative gas production.When the pressure of the extraction well is constant,the gas production rate and cumulative gas production of hydrates increase with the increase of crack length,crack permeability and porosity.The combination of fracturing and depressurization can improve the efficiency of hydrate extraction,providing a reference for the commercialization of hydrate extraction in the future.

关 键 词：天然气水合物 降压法 裂缝 数值模拟 开采效率 

分 类 号：TE319[石油与天然气工程—油气田开发工程]