双水平井SAGD预热阶段温度场计算  

Calculation of temperature field in SAGD preheating stage of double horizontal wells

作　　者：徐明海 舒华文 巩亮[1] 孙宪航 孙涛 XU Ming-hai;SHU Hua-wen;GONG Liang;SUN Xian-hang;SUN Tao(College of Pipeline and Civil Engineering, China University of Petroleum, Qingdao 266580, China;Binnan Oil Production Plant, Shengli Oilfield of Sinopec, Binzhou 256606, China;Shengli College, China University of Petroleum, Dongying 257087, China)

机构地区：[1]中国石油大学储运与建筑工程学院,山东青岛266580 [2]中国石化胜利油田分公司滨南采油厂,山东滨州256606 [3]中国石油大学胜利学院,山东东营257087

出　　处：《热科学与技术》2018年第2期94-101,共8页Journal of Thermal Science and Technology

基　　金：国家自然科学基金资助项目(51276199)

摘　　要：采用满足质量守恒的流函数方法,编制有限容积法程序,模拟计算了双水平井蒸汽辅助重力泄油（steam assisted gravity draining,SAGD）蒸汽循环启动预热阶段温度场演化情况。对比了纯导热与导热及热对流共同作用下所需预热时间的差别,给出了单位长度井散热速度和两井中间位置温度随时间的变化,同时,也分析了井间距对预热时间的影响。结果表明,单位井长度的散热速度随时间的延长逐渐减少,在初始阶段变化较快,然后以较慢的速度降低。这表明,以井筒恒热流边界条件的温度叠加原理分析方法,建立预测阶段温度分布模型,预测热联通需要的加热时间是不合适的。不同井间距工况预热阶段数值计算表明,影响预热时间的主要因素为两井间距,间距扩大一倍,需要的预热时间延长约为原来的4倍;原油黏度很大且随温度变化不太敏感或井间距较小的情况,自然对流换热作用很弱,在预测预热时间时可以按照纯导热模型处理,而相对不太黏稠的原油或井间距较大时热对流作用强,不能忽略对流传热的影响,自然对流换热可大大缩短预热时间。The temperature field evolution of SAGD steam cycle of double horizontal wells is simulated using the stream function method. The difference between the pure thermal conduction effect and the effect of heat conduction coupling with convection is compared. The heat dissipation rate of unit length and the change of the temperature in the middle of the two wells with time are given. Besides, the influence of well spacing on preheating time is also analyzed. The final results show that the heat dissipation rate of unit length is larger in the initial stage, but decreases quickly and gradually reaches a relatively stable value. The main factor affecting the preheating time is the well spacing, and the preheating time is 4 times of the original one when the well spacing is doubled. The natural convection heat transfer effect is very weak when the viscosity of crude oil is large or the well spacing is small, while it becomes strong when the viscosity of crude oil is not very large or the well spacing is large. For the latter case, the preheating time is substantially reduced.

关 键 词：水平井 蒸汽辅助重力泄油 流函数 数值方法 非结构化网格 

分 类 号：TE35[石油与天然气工程—油气田开发工程]