非均质条件下聚合物微球/聚合物深部调驱实验研究

Abstract

Abstract:

Firstly, we evaluated the polymer microspheres and polymer properties, then, studied the migration and plugging properties of the microspheres, polymer and compound system（microspheres + polymer） by microporous membrane filtration device, and implemented the profile control and oil displacement experiments about the systems above by the parallel cores physical simulation displacement apparatus. The results indicated that the polymer microspheres was spherical micron-grade particles with superior dispersibility, and its apparent viscosity, which was much less than that of polymer with the same mass concentration, is close to that of water under the relatively high shear rate. The polymer failed to plug the micropores effectively. The plugging ability of the microspheres was the strongest, followed by the compound system. Under the condition of the strong heterogeneity, the effects of the profile control and the oil displacement of the compound system attained the best and corresponding enhanced oil recovery for high and low permeable cores were respectively 20.86 % and 36.89 %. There was a synergistic effect between the microspheres and polymer for the compound system. That the amount of the microspheres captured and migration property reduced and intensified in the porous medium mainly due to the impact of carrying and lubrication of polymer. Additionally, the influence of mobility ratio control and viscoelastic oil displacement of polymer could effectively improve oil recovery. For the actual reservoirs with relatively strong heterogeneous conditions, it was essential to take the profile control and flooding technology of the microspheres/polymer compound system into account firstly.

Key words: polymer microspheres, polymer, compound system, profile control and oil displacement, heterogeneous condition

CLC Number:

TE357

Wanfen Pu,Shuai Zhao,Zilai Mei, et al. Experimental study on profile control and oil displacement of polymer microspheres/polymer under heterogeneous conditions[J]. Reservoir Evaluation and Development, 2018, 8(3): 61-65.

Figures/Tables 10

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References 15

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离子	浓度	总矿化度
K⁺、Na⁺	9 390	25 036
Ca²⁺	296	25 036
Mg²⁺	15	25 036
SO₄^2-	492	25 036
HCO₃^-	397	25 036
Cl^-	14 446	25 036

岩心编号	长度/ cm	直径/ cm	水测渗透率/ 10^-3μm²	渗透率级差,f	孔隙度, %	含油饱和度,%
1	6.984	3.812	501.32	9.81	18.59	71.19
2	7.054	3.798	51.08	9.81	14.39	52.17
3	6.996	3.814	498.65	9.94	18.61	70.52
4	7.064	3.806	50.16	9.94	14.93	52.46
5	6.998	3.808	500.62	9.86	18.12	70.64
6	7.056	3.826	50.78	9.86	14.24	52.81

实验方案	岩心编号	水驱采收率	化学驱提高采收率	后续水驱提高采收率	总提高采收率
①	1	54.67	4.21	6.93	11.14
①	2	0	0	0	0
②	3	54.75	6.5	7.6	14.1
②	4	0	10	9.83	19.83
③	5	55.03	8.54	12.31	20.85
③	6	0	1.64	35.25	36.89

Experimental study on profile control and oil displacement of polymer microspheres/polymer under heterogeneous conditions

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