摘要
针对砾岩油藏层间非均质性强,开采过程中层间矛盾突出,剖面动用差异大,油藏整体采收率低的特点,以新疆油田七区克上组砾岩油藏为例,开展了不同非均质程度模型恒压水驱油实验。结果表明:同一组并联水驱油实验中,渗透率越高的岩芯越先启动,含水率上升越快,无水采收率越低,驱油效率越高;层间渗透率级差越大模型驱油效率越低,与高渗岩芯相对渗透率级差大于8的岩芯并联驱替不能启动;粗砂岩和含砾粗砂岩等单模态或双模态孔隙结构岩芯驱油效率较高,砂砾岩和砾岩等复模态孔隙结构岩芯驱油效率较低;增大并联模型驱替压差后中低渗岩芯驱油效率增大,含水率上升速度加快。
Aiming at the strong heterogeneity,the obvious contradiction between layers,the big producing difference of the profile and the low overall recovery rate of the reservoir. Taking the conglomerate reservoir of T2k2 formation in Block 7 of Xingjiang Oilfield as an example,a series of water-oil displacing experiments of different heterogeneous degree are conducted at constant pressure. The experiments show that in the same group of the parallel water-oil displacing experiments,the higher the permeability is,the faster the cores start while the water cut rises faster,the breakthrough recovery gets lower and the displacing efficiency becomes higher;the differential between the layers increases as the displacing efficiency falls and the parallel displacement with relative permeability differential bigger than 8 can not be launched;cores of single mode or dual mode pore structure have higher displacement efficiency,the complex mode of sandy conglomerate and conglomerate has lower displacement efficiency,the displacement efficiency of the low-medium permeability cores increases and the water cut rises faster after the displacement pressure of the parallel model is magnified.
出处
《西南石油大学学报（自然科学版）》
CAS
CSCD
北大核心
2014年第5期129-135,共7页
Journal of Southwest Petroleum University(Science & Technology Edition)
关键词
砾岩油藏
层间非均质性
并联岩芯
水驱油实验
驱油效率
conglomerate reservoir
interlayer heterogeneity
cores grouped in parallel
water displacing oil experiment
oil displacement efficiency
