Numerical simulation on gas production from a hydrate reservoir underlain by a free gas zone  

作　　者：BAI YuHu LI QingPing LI XiangFang DU Yan 

机构地区：[1]Technology Research Department, China National Offshore Oil Corporation, Research Center, Beijing 100027, China [2]Faculty of Petroleum Engineering, China University of Petroleum, Beijing 102249, China [3]Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences, Guangzhou 510640, China

出　　处：《Chinese Science Bulletin》2009年第5期865-872,共8页

基　　金：Supported by the National High Technology Research and Development Program of China (Grant No. 2006AA09A209);the National Basic Research Program of China (Grant No. 2009CB219507)

摘　　要：Physical and mathematical models of gas production by depressurization from a hydrate reservoir underlain by a free gas zone are established. The mathematical model can interpret the effects of the flow of multiphase fluids, the process of hydrate dissociation, ice-water phase transition, the variation of permeability, the convection and conduction on hydrate dissociation and gas and water production. The evolutions of temperature, pressure, and saturations in the hydrate and free gas zones are eluci-dated during gas production. The variation of some parameters, such as gas and water rates, with time is presented. The results show that the overlying hydrate zone can supply a certain amount of gas to improve the output of a production well and evidently prolong the lifespan of a gas reservoir.Physical and mathematical models of gas production by depressurization from a hydrate reservoir underlain by a free gas zone are established. The mathematical model can interpret the effects of the flow of multiphase fluids, the process of hydrate dissociation, ice-water phase transition, the variation of permeability, the convection and conduction on hydrate dissociation and gas and water production. The evolutions of temperature, pressure, and saturations in the hydrate and free gas zones are elucidated during gas production. The variation of some parameters, such as gas and water rates, with time is presented. The results show that the overlying hydrate zone can supply a certain amount of gas to improve the output of a production well and evidently prolong the lifespan of a gas reservoir.

关 键 词：游离气带 数值模拟 水合物气藏 数学模型 多相流体 

分 类 号：TE155[石油与天然气工程—油气勘探]