孤岛油田底水稠油油藏注氮气辅助蒸汽吞吐的选区新方法  

A new method of selecting zone for nitrogen-assisted steam stimulation in heavy oil reservoir with bottom water in Gudao oilfield

作　　者：杨阳[1] 刘慧卿[1] 庞占喜[1] 张兆祥[1] 陈庆元 

机构地区：[1]中国石油大学(北京)石油工程教育部重点实验室,北京102249 [2]中国石油大港油田分公司勘探事业部,天津300000

出　　处：《油气地质与采收率》2014年第3期58-61,115,共4页Petroleum Geology and Recovery Efficiency

基　　金：国家重点基础研究发展计划(973)项目"碳酸盐岩缝洞型油藏提高采收率基础研究"(2011CB201006);国家科技重大专项"缝洞型碳酸盐岩油藏提高开发效果技术研究"(2011ZX05014-003-008HZ);中国石油化工股份有限公司项目"塔河缝洞单元注水评价及优化技术"(P13142)

摘　　要：在注入相同蒸汽量的基础上分析注氮气辅助蒸汽吞吐效果时,许多学者忽略了注入总热量对蒸汽吞吐的影响。在注入总热量相同的条件下,通过分析孤岛油田底水稠油油藏特征,选取研究区3种典型地层参数,即油层厚度分别为2-5,5-8和8 m以上,渗透率分别为500×10^-3,1 000×10^-3,2 000×10^-3μm^2,对应的孔隙度分别为30%,35%和40%,利用数值模拟技术从增油量、加热半径和底水锥进程度3个方面,对注氮气辅助蒸汽吞吐的效果进行了对比。建立了强底水和弱底水条件下普通稠油以及特稠油油藏注氮气辅助蒸汽吞吐地层参数的筛选图版,利用该图版可有效分析底水稠油油藏注氮气辅助蒸汽吞吐的可行性。研究结果表明：孤岛油田东区Ng3和中二北Ng5油层适合注氮气辅助蒸汽吞吐;孤北1区Ng3油层不适合注氮气辅助蒸汽吞吐。When analyzing the effect of nitrogen injection assisted steam stimulation on the basis of the same amount of steam injec-tion, many scholars have ignored the effects of total heat injection of steam stimulation. Through the analysis of characteristics of heavyoil reservoir in Gudao oilfield under the same heat injection, we select reservoir thickness at 2-5, 5-8, 8 m above, and permeability of500×10-3,1 000×10-3,2 000×10-3μm2, corresponding to a porosity of 30%, 35% and 40% respectively. In experiments, we compare thenitrogen-assisted steam stimulation performance by using numerical simulation technology through three aspects: oil increment, heat-ing radius and the degree of bottom water coning. At last, new methods of selecting zone for nitrogen-assisted steam stimulation are ac-complished, which consider the bottom water and viscosity. The methods can be utilized to effectively analyze the feasibility of nitro-gen-assisted steam stimulation in heavy oil reservoir. Study has shown that the nitrogen-assisted steam stimulation is suitable in east-ern Ng3 andZhongerbei Ng5 and notapplicable in Gubei Ng3.

关 键 词：稠油油藏 底水油藏 蒸汽吞吐 注氮气 数值模拟 孤岛油田 

分 类 号：TE345[石油与天然气工程—油气田开发工程]