应用废弃油气井获得地热能  

Geothermal Energy Obtained From Obsolete Oil and Gas Production Wells

作　　者：卜宪标[1] 马伟斌[1] 黄远峰[1] 

机构地区：[1]中国科学院广州能源研究所中国科学院可再生能源与天然气水合物重点实验室,广东广州510640

出　　处：《热能动力工程》2011年第5期621-625,638,共5页Journal of Engineering for Thermal Energy and Power

基　　金：国家高技术研究发展计划(863计划)基金资助项目(2009AA05Z433)

摘　　要：为了有效的利用现有的废弃油井和气井中存在的大量热能,建立了废弃油气井中循环流体的流动换热方程以及循环流体和岩石的热交换方程,运用数值模拟进行了求解,计算结果表明:循环流体的流量和地温梯度是影响换热量的两个最主要因素。地温梯度Tg分别为25、45和65℃/km时,最大换热量分别为184.12,394.22和604.96 kW。对于确定的地温梯度,总存在最优的流速使换热量或发电量最大;地热能采出系统能够长期稳定运行。对于Tg=45℃/km的工况,第一年和第八年末采出井口流体的温度分别为100.38和99.48℃;两井之间的最小间距应不小于20 m。To effectively utilize the thermal energy currently existing in the obsolete oil and gas production wells in a large quantity,established were a flow heat exchange formulae for circulating fluids in obsolete oil and gas production wells and a formulae for the heat exchange between the circulating fluids and rocks.Subsequently,a numerical method was used to seek solutions.The calculation results show that the flow rate of the circulating fluid and the geothermal temperature gradient are two most important factors influencing the heat exchange quantity,when the geothermal temperature gradient Tg is 25,45 and 65 ℃/km respectively,the maximal heat exchange quantity is 184.12,394.22 and 604.96 kW respectively.For a definite geothermal temperature gradient,there always exists an optimal flow speed to result in a largest amount of heat exchange or power generation.A geothermal energy production system can be stably in operation for a long time,for the operating condition of which Tg=45℃/km,the temperature of the fluid remained in a well will be 100.38 and 99.48 ℃ at the first and eighth year respectively.The minimum spacing between any two wells should not be less than 20 m.The calculation results verified the feasibility that hot fluids produced from obsolete oil and gas production wells can be used for power generation or heating or as a hotspring.

关 键 词：废弃油气井 地热 发电 供暖 

分 类 号：TK529[动力工程及工程热物理—热能工程]