胜利油田超稠油油藏蒸汽驱三维物理模拟与应用  

3Dphysical simulation of steam flooding and applications in ultra-heavy oil reservoirs of Shengli oilfield

作　　者：曹嫣镔[1,2] 刘冬青[2] 王善堂[2] 于田田[2] 夏道宏 

机构地区：[1]中国石油大学化学工程学院,山东青岛266580 [2]中国石化胜利油田分公司采油工艺研究院,山东东营257000

出　　处：《石油学报》2013年第4期733-739,共7页Acta Petrolei Sinica

基　　金：国家重大科技专项(2011ZX05011-002)资助

摘　　要：针对胜利油田单56区块油藏条件,利用蒸汽驱三维物理模拟装置,开展了20%、40%、60%蒸汽干度条件下反九点井网超稠油油藏蒸汽驱实验。分析了单井及井组生产动态,并在蒸汽驱的基础上研究了采用氮气泡沫的方式改善超稠油蒸汽驱的开发效果。实验结果表明,超稠油油藏汽窜较为严重,综合含水上升较快,蒸汽腔发育不均匀;边井生产效果较好,角井温度场发育较差,产液量和产油量较低,对井组贡献率较低。通过提高蒸汽干度可以有效提高蒸汽驱阶段的采收率,当注入油藏蒸汽干度从20%提高到60%,蒸汽驱阶段的采出程度提高19.86%。段塞注入0.093PV的泡沫体系时,蒸汽汽窜得到有效抑制,边井产液量和综合含水均出现明显下降,角井温度场开始发育,角井产液量和产油量显著增加,阶段综合含水下降7%,提高采收率15%以上。通过提高蒸汽干度和辅助氮气泡沫调剖工艺,超稠油油藏可以转为蒸汽驱进一步提高采收率。A three-dimensional physical simulation on steam flooding of ultra-heavy oil reservoirs for an inverted nine-spot well net- work was designed according to reservoir conditions of the Shan-56 block in the Shengli oilfield and conducted under conditions of the 20% , 40% and 60% steam dryness respectively, in order to analyze the production status of a single well or well group and improve recovery effects of ultra-heavy oil reservoirs by nitrogen foam injection on the basis of steam flooding. The experimental results show that the steam channeling of ultra-heavy oil reservoirs is relatively severe, the comprehensive water cut rises fast and steam chambers develop unevenly. Edge wells have an increase in production, while corner wells show a poor temperature growth and low level both liquid and crude production, thus contributing a little to the well group output. The steam flooding re- covery could be enhanced remarkably by increasing the steam dryness, for instance, the displacement efficiency of steam flooding increased by 19. 86% when the dryness of injected steam rose from 20% to 60%. When slug injection was a 0. 093 PV foam system on the basis of steam flooding, the steam channeling could be effectively suppressed along with a remarkable decrease in both the liquid production and comprehensive water cut of edge wells. Moreover, a temperature field around corner wells began to develop along with a significant increase in both the liquid and crude production, the comprehensive water cut of intervals de- creased by 7 % , while the recovery ratio was enhanced by over 15 %. Therefore, the enhanced oil recovery of ultra-heavy oil res- ervoirs can be further increased by increasing the steam dryness in steam flooding associated with an auxiliary profile control tech- nique, nitrogen foam injection.

关 键 词：蒸汽驱 超稠油 三维物模 泡沫 蒸汽干度 汽窜 含水率 蒸汽腔 

分 类 号：TE357[石油与天然气工程—油气田开发工程]