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SAGD开发效果综合评价新方法
卢川,田冀,郑强,贾振,刘慧卿
0
(1.中海油研究总院有限责任公司,北京100028;2.中国石油大学(北京),北京102249)
摘要:
为了实现对SAGD生产过程和开发效果的快速评价,利用油藏工程方法,结合SAGD生产过程中的实际注采动态数据,推导了6个SAGD开发效果评价指标模型,包括瞬时汽油比、累积汽油比、累积采注比、累积水汽比、含水率和蒸汽累积滞留比。在给定极限瞬时汽油比的条件下,得到了不同预测采收率下评价指标与采出程度变化关系标准模板,形成一套可推广的SAGD生产过程和开发效果评价方法。将该方法应用于加拿大长湖油田泄油区15,结果表明:瞬时汽油比、累积采注比和累积水汽比3个评价指标模型可动态表征层间高含水层和顶水层对生产效果的影响。在初始标定采收率为73%的基础上,若后续采取调整优化,预测采收率可提升至80%。
关键词:  油砂  蒸汽辅助重力泄油  注采特征曲线  油藏工程方法  开发效果评价
DOI:10.13673/j.cnki.cn37-1359/te.2019.04.015
基金项目:国家科技重大专项“油砂SAGD开发地质油藏评价及方案优化技术”(2016ZX05031-003)。
New method to comprehensively evaluate stream-assisted gravity drainage(SAGD)development result
LU Chuan,TIAN Ji,ZHENG Qiang,JIA Zhen,LIU Huiqing
(1.CNOOC Research Institute Co.,Ltd.,Beijing City,100028,China;2.China University of Petroleum(Beijing),Beijing City,102249,China)
Abstract:
In order to quickly evaluate the production process and the development result of SAGD,six mathematical models which can be used as indexes to evaluate SAGD performance were proposed based on the injection and production data during SAGD and by using reservoir engineering methods. These six models include instantaneous steam oil ratio,cumulative steam oil ratio,cumulative production injection ratio,cumulative water steam ratio,water cut and cumulative steam retention ratio. Under the determined extreme instantaneous steam oil ratio,the variation between the degree of recovery factor and above evaluation indexes under different forecasting final-recovery factor were obtained to form standard templates.Then a promoted method used to evaluate SAGD development process and result was formed. This method was applied to the drainage area 15 of Long Lake Oilfield,Canada. The results show that the models of the instantaneous steam oil ratio, the cumulative production injection ratio and the cumulative water steam ratio can be used to dynamically characterize the effect of high water cut zone and top water zone on production. On the basis of initial recovery factor of 73%,the finally forecasted recovery factor can be increased to 80% if further adjustment methods are conducted.
Key words:  oil sand  SAGD  injection-production characteristic curve  reservoir engineering method  development result evaluation

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