基于正交数值试验的蒸汽吞吐转SAGD关键因素研究  

KEY FACTORS OF SAGD AFTER CYCLIC STEAM STIMULATION BASED ON ORTHOGONAL NUMERICAL TEST

作　　者：王建俊[1,2] 鞠斌山[1,2] 刘楠楠[1,2] 

机构地区：[1]中国地质大学(北京)能源学院,北京100083 [2]中国地质大学(北京)非常规天然气能源地质评价与开发工程北京市重点实验室,北京100083

出　　处：《新疆石油天然气》2016年第3期44-48,53,共6页Xinjiang Oil & Gas

基　　金：国家科技重大专项课题(2011ZX05009-006);中央高校基本科研业务费专项资金项目(35832015034)

摘　　要：超稠油油藏蒸汽吞吐开采过程中,周期产能递减快且热利用效率不断下降,蒸汽辅助重力泄油技术(SAGD)可以作为有效的开发接替方式。针对蒸汽吞吐转SAGD的最佳时机及转SAGD后的影响因素等问题,利用热采数值模拟手段,以辽河油田馆陶组油藏地质特征为基础建立三维模型进行研究。在此基础上利用正交试验设计和方差分析方法,以采收率和累计油汽比作为评价指标,对影响SAGD开发效果的5大关键因素进行分析。结果表明:蒸汽吞吐6个周期后转直平组合SAGD的开发效果最好;对五个因素的影响程度大小进行排序,以采收率为评价指标时:注汽速度>注汽干度>采注比>注汽压力>垂向距离,以累计油汽比为评价指标时:注汽干度>注汽速度>注汽压力>垂向距离>采注比;注汽速度和注汽干度是影响SAGD阶段开发效果最重要的两大因素。为矿场开发方式的调整和优化提供了一定的理论基础。With the increase of cycles,the cyclic steam simulation(CSS) has a quick decline of oil production and low efficiency of heat utilization in the super-heavy oil reservoir,and steam assisted gravity drainage technology(SAGD) is an effective way used after cyclic steam stimulation.On the basis of reservoir parameters and operating conditions of Guantao formation in Liaohe Oilfield,the timing of switching to SAGD and the type of the injection well were studied by the use of numerical simulation method.Moreover,with the recovery factor(RF)and cumulative oil and steam ratio(COSR) used as the evaluation indicators,the influences of five key factors to the development were analyzed through orthogonal numerical test.The results show,the best timing of switching to SAGD is after six cycles of CSS and the type of the injection well is vertical well.The significant order of factors by visual analysis method for recovery factor from high to low is:steam injection rate,steam injection quality,production injection ratio,steam injection pressure,vertical distance;and for COSR is:steam injection quality,steam injection rate,steam injection pressure,vertical distance,production injection ratio.In brief,the most important factors are steam injection rate and steam injection quality.This study plays an important role for the improvement and optimization of the oilfield development.

关 键 词：蒸汽辅助重力泄油 转SAGD时机 关键因素 正交设计 方差分析 

分 类 号：TE357.4[石油与天然气工程—油气田开发工程]