顶水水侵对SAGD开采效率的影响及顶水下窜速率预测  

Influence of Top Water Intrusion on SAGD Production Efficiency and Prediction of Downward Channeling Rate of Top Water

作　　者：蒋琪 王中元[2] 宫宇宁[2] 郑爱萍[3] 孙洪安[2] 刘佳丽[1] 何杰 黄思源 Jiang Qi;Wang Zhongyuan;Gong Yuning;Zheng Aiping;Sun Hongan;Liu Jiali;He Jie;Huang Siyuan(Southwest Petroleum University,Chengdu,Sichuan 510000,China;PetroChina Liaohe Oilfield Company,Panjin,Liaoning 124010,China;PetroChina Xinjiang Oilfield Company,Karamay,Xinjiang 834000,China)

机构地区：[1]西南石油大学,四川成都510000 [2]中国石油辽河油田分公司,辽宁盘锦124010 [3]中国石油新疆油田分公司,新疆克拉玛依834000

出　　处：《特种油气藏》2022年第2期72-76,109,共6页Special Oil & Gas Reservoirs

基　　金：中国石油重大专项“辽河油田千万吨稳产关键技术研究与应用”(2017E-1604)。

摘　　要：针对辽河油田杜84块馆陶组油层SAGD开发存在顶水下窜风险,通过数值模拟与理论研究相结合的方式,研究顶水下窜对SAGD开发效果的影响,揭示了汽腔与顶水层沟通后汽腔发育程度、累计产油量、油汽比和汽腔压力的变化规律。在数值模拟研究的基础上,基于油藏中多相流体渗流和传热原理,建立了预测顶水下窜速率的理论模型。研究结果表明:当汽腔与顶水层沟通后,SAGD的累计产油量和油汽比将大幅下降,且顶水层压力越高,对SAGD生产效果的影响程度越大;在汽腔与顶水层之间维持一定的隔离段厚度是降低顶水对SAGD后期影响的最有效手段,在目前操作条件下,建议汽腔与顶水层之间的最小隔离段厚度为20 m。该研究为制订顶水稠油油藏SAGD操作技术界限提供了理论依据。In response to the risk of downward channeling of top water in SAGD development of oil reservoirs in Guantao Formation,Block Du84,Liaohe Oilfield,the influence of the downward channeling of top water on the SAGD development effect was studied in combination with numerical modeling and theoretical studies to discover the changes in the development degree of steam chamber,cumulative oil production,oil-steam ratio and steam chamber pressure after the steam chamber is connected to the top water zone.On the basis of numerical modeling study,a theoretical model was established for predicting the channeling rate of the top water according to the principles of multiphase fluid seepage and heat transfer in oil reservoirs.The results of the study showed that the cumulative oil production and oil-steam ratio in SAGD production were decreased significantly after the steam chamber was connected to the top water zone,and the higher the pressure of the top water zone,the greater the influence on the production effect of SAGD;the most effective method of reducing the influence of top water on the later stage of SAGD was to maintain a certain isolator thickness between the steam chamber and the top water zone;therefore,the minimum isolator thickness is recommended to be 20 m between the steam chamber and top water zone under existing operating conditions.This study provides a theoretical basis for determining the technical limits of SAGD operation in heavy oil reservoirs with top water.

关 键 词：稠油 顶水油藏 SAGD 水侵速率 热效率 隔离段厚度 

分 类 号：TE357[石油与天然气工程—油气田开发工程]