渤海LD5-2油藏复合调驱效果物理模拟实验研究

doi:10.13809/j.cnki.cn32-1825/te.2020.04.019

Abstract

Abstract:

Bohai LD5-2 heavy oil reservoir has strong heterogeneity and low rock cementation strength. It has formed a dominant channel due to long-term water injection. At present, it is difficult to meet the requirements of greatly improving oil recovery by single profile control, flooding or oil displacement measures. The combined use of profile control, displacement and other measures has become a new way to solve this bottleneck. In order to meet the actual demands of LD5-2 reservoir, in-room experimental study of profile modification measure of “profile control+profile modify+oil displacement” is carried out by the longitudinal three-layer heterogeneous core and a new model of “injection and production separately” and the means of electrode measurement. The results show that, compared with the vertical well network, the hydraulic pressure difference of the mid-low permeability layer is larger after the horizontal well network profile adjustment, the effect of expanding the spreading volume is better, and the recovery rate increases by 28.50 %. For the heterogeneous cores, the remaining oil in the longitudinal direction is mainly distributed in the mid-low permeability layers. On the plane, the vertical well pattern is mainly distributed in the two wings away from the main stream line, while the horizontal well network oil-water interface is parallel to the well trajectory. The composite gel in the slug combination of “composite gel+microsphere/high efficiency oil displacing agent” has a strong retention effect in the high permeability layers. The liquid flow steering effect is better, which makes the synergistic effect in the subsequent “microsphere/high efficiency oil displacing agent” composite system better. It takes into account the technical requirements of expanding the volume and improving the washing efficiency, and the effect of increasing oil and precipitation is obvious, with the increase of recovery rate by 26.50 %. Profile modification is the key to increase oil recovery greatly.

Key words: Bohai heavy oil reservoir, profile modification, well type, physical simulation, recovery factor

CLC Number:

TE357.46

ZHANG Nan,LU Xiangguo,LIU Jinxiang,GE Song,LIU Yigang,ZHANG Yunbao,LI Yanyue. Physical simulation experiment study on effect of profile modification in Bohai LD5-2 reservoir[J].Reservoir Evaluation and Development, 2020, 10(4): 119-124.

Figures/Tables 11

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离子组成和含量/（mg·L^-1）							总矿化度/ （mg·L^-1）
K⁺+Na⁺	Ca²⁺	Mg²⁺	Cl^-	SO₄^2-	CO₃^2-	HCO₃^-	总矿化度/ （mg·L^-1）
2 169.8	816.6	94.2	4 848.8	156.1	0	173.9	8 259.5

岩心编号	小层或条带渗透率/10^-3 μm²			平均渗透率/ 10^-3 μm²	渗透率级差
岩心编号	高渗透条带	中渗透条带	低渗透条带	平均渗透率/ 10^-3 μm²	渗透率级差
岩心Ⅰ	11 200	6 400	1 600	6 400	7

方案编号	岩心类型	含油饱和度/ %	采收率/%
方案编号	岩心类型	含油饱和度/ %	水驱	调剖剂	调驱剂	高效驱油剂	最终	增幅
方案1-1	岩心Ⅰ（1）：纵向非均质岩心,3直井	70.08	23.4	25.0	35.3	40.4	46.6	23.2
方案1-2	岩心Ⅰ（2）：纵向非均质岩心,2水平井	70.35	27.7	30.2	40.8	47.9	56.2	28.5

实验方案	原油黏度/ （mPa·s）	方案内容	含油饱和度/ %	采收率/%
实验方案	原油黏度/ （mPa·s）	方案内容	含油饱和度/ %	水驱	最终	增幅
2-1	17	0.3 PV聚合物微球	74.47	19.57	35.14	15.57
2-2		0.2 PV聚合物微球/0.1 PV高效驱油剂	74.39	19.10	38.82	19.72
2-3		0.05 PV复合凝胶+0.15 PV聚合物微球/0.1 PV高效驱油剂	72.69	19.87	46.37	26.50

Physical simulation experiment study on effect of profile modification in Bohai LD5-2 reservoir

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