摘要
冷采后期稠油油藏泡沫油现象逐渐消失，开发效果变差。从注气形成二次泡沫油的角度出发，以非常规实验与压力衰竭实验为依据，揭示泡沫油特性，分析各类泡沫油油藏模拟模型的适用性，系统评价注气吞吐提高该类油藏采收率的可行性，研究注采工艺等参数的影响规律。研究表明，泡沫油存在拟泡点压力，且随静止时间的减小而减小，泡沫油压缩系数在10～0．012MPa叫之间，高于常规原油。6组分泡沫油模型的拟合精度最高，对该类油藏的适用性最强。泡沫油油藏注气吞吐开发存在最佳的注气时机及焖井时间；增加注气速度、注气压力和采液速度有利于改善注气吞吐开发效果；出砂冷采及注气吞吐开发过程中应尽可能加快溶解气及注入气向分散气的转化速度。
Foamy oil phenomenon of heavy oil reservoirs gradually disappears in the latter period of solution gas drive, which causes the decrease of oil development. Based on the formation of secondary foamy oil by gas injection, foamy oil unconventional experiments and pressure depletion tests are conducted to reveal the characteristics of the foamy oil and analyze the applicability of various types of foamy oil reservoir simulation models. Evaluation of improving oil recovery by nature gas huff and puff is conducted and the influence of injection and production parameters is studied. The study shows that foamy oil exists quasi bubble point which decreases with the decrease of time. The foamy oil compression coefficient is in the range of 10~0. 012 MPa-1 , which is higher than that of the conventional crude oil. Foamy oil model of six components is the most suitable model for the foamy oil reservoir. There is optimal gas injection and soak time for nature gas huff and puff. Increasing the gas injection speed, gas injection pressure and fluid production rate will improve the performance of nature gas huff and puff. Increasing the speed that dissolved and injected gas change into disperse gas is very important during the solution gas drive and gas injection process.
出处
《重庆大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2013年第11期115-120,共6页
Journal of Chongqing University
基金
国家科技重大专项大型油气田及煤层气开发“十二五”课题资助项目(2011ZX05032-001)
中央高校基本科研业务费专项资金资助项目(11CX06022A)
关键词
压力衰竭实验
泡沫油
非常规实验
溶解气驱
油藏数值模拟
注气吞吐
pressure depletion test
foamy oil
unconventional experiments
solution gas drive
reservoir simulation
natural gas huff and puff
