摘要
以国外油田普通稠油油藏聚合物驱试验区实际地层水及原油物性为基础,对超高分子聚合物驱进行了适应性评价,设计了填砂管和胶结模型的物理模拟试验,通过油藏数值模拟方法,对试验区4个五点井组的开发技术策略进行了优化设计。结果表明,超高分子聚合物较中分子和普通聚合物有更强的黏弹性和稳定性,更有利于驱出盲端剩余油,提高驱油效率;与水驱相比,超高分子聚合物驱尤其在聚驱前调剖可大幅度提高采收率,增幅达27.2个百分点,整体段塞注入方式优于段塞组合方式,且驱替相与被驱替相黏度比为3时效果最佳;该试验区最佳转聚驱时机为含水率达90%,且超高分子聚合物体系浓度为1500mg/L。该结果与物理模拟结果较为接近。
Ordinary, middle, and high molecular polymers have been widely used to enhance oil recovery, and good results have been obtained. However, the effect of superhigh molecular polymer flooding needs to be further studied due to the deeper accumulation, higher reservoir pressure, and some restriction on technology of ploymer flooding of the oilfields in China. Therefore, an ordinary heavy oil reservoir pilot is taken for polymer flooding, based on the water and oil physical characteristics of formations, and the stability and rheology of the superhigh molecular polymer combined with purified water. The applicability evaluation of polymer flooding is carried out as well. Results show that the superhigh molecular polymer is more efficient in oil displacement compared with middle and ordinary molecular. What's more, sand pack column and consolidated fill physical model tests are designed. It is revealed that superhigh molecular polymer flooding can enhance oil recovery greatly and the oil recovery is enhanced by 27.2% compared with water flood, especially, when pre-flooding profile controlling is performed. Besides, the method of mass slugs injection is better than slugs combination ones. When the ratio of viscosity between polymer and oil hits three times, the development effect reaches peak value. By the aid of the numerical simulation method, the technological measures for developing the four five-spot well groups in the pilot are optimized. The result shows that the timing of waterflooding of the pilot will be the best if the water cut reaches 90% and the concentration of superhigh polymers is 1500 mg/L.
出处
《石油钻采工艺》
CAS
CSCD
北大核心
2007年第3期63-66,共4页
Oil Drilling & Production Technology
基金
国家973项目资助"化学驱和微生物驱提高石油采收率的基础研究"(2005CB22130004)
关键词
普通稠油
超高分子聚合物
物理模拟
提高采收率
数值模拟
ordinary heavy oil
superhigh molecular polymer
physical simulation
enhanced oil recovery
numerical simulation
