高含水高温油藏W/O型乳化剂OB-2性能评价及驱油研究

摘要/Abstract

摘要：

针对如何在水驱后进一步开发高含水高温油藏,提出了一种表面活性剂就地乳化驱油技术,对油包水（W/O）型乳化剂OB-2体系进行了乳化特性评价及乳状液驱油研究。研究结果表明,随着乳化剂浓度增大,乳液黏度先增大后减小;对于X油藏原油,乳化剂最佳浓度为0.3wt%,在此浓度下,油水界面张力可降低至10 ^-2 mN/m数量级;在水油体积比低于7∶3时,乳化剂OB-2可促使油水两相完全乳化,形成高黏度的W/O型乳液,其中,水油体积比为7∶3时乳液黏度最大,增黏率高达370 %。岩心驱油实验结果表明,均质条件下,水驱后注入0.3PV乳化剂OB-2体系,可提高原油采收率达26.15 %;非均质条件下,该乳化体系可在级差低于7.6时表现出良好的流度控制及非均质调控能力,扩大波及体积。

关键词: 高温, 高含水, 油包水型乳化剂, 就地乳化驱油, 非均质性调控

Abstract: Aim

ed at how to develop high temperature reservoir after water flooding, we proposed the in-situ emulsion flooding by injecting surfactant solutions to evaluate the emulsifying property and study on the oil displacement by the emulsion of the OB-2 system for the W/O（water in oil）emulsifier. The results showed that the emulsion viscosity firstly increased and then decreased along with emulsifier concentration. For oil in reservoir-X, the optimal emulsifier concentration was 0.3 wt% at which could make the interfacial tension reduce to 10 ^-2 mN/m order of magnitude. When the water-oil ratio was lower than 7∶3, the complete emulsification of oil-water happened and the W/O emulsion with high viscosity would form. The maximum emulsion viscosity appearde when the oil-water ratio was 7∶3, with the viscosity increasing rate of as high as 370 %. The results of emulsion flooding indicated that the recovery factor of the homogeneous core could increase another 26.15 % after water flooding by injecting 0.3PV OB-2 system. On the other hand, when the permeability ratio of parallel cores was lower than 7.6, applying the OB-2 system could achieve good mobility control and heterogeneity regulation.

Key words: high temperature, high water cut, W/O emulsifier, in-situ emulsion flooding, heterogeneous regulation

中图分类号:

TE39

蒲万芬,梅子来,杨洋等. 高含水高温油藏W/O型乳化剂OB-2性能评价及驱油研究[J]. 油气藏评价与开发, 2019, 9(1): 38-43.

Wanfen Pu,Zilai Mei,Yang Yang, et al. Evaluation of OB-2 system for W/O emulsifier and displacement experiments research at high temperature reservoir in high water cut period[J]. Reservoir Evaluation and Development, 2019, 9(1): 38-43.

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岩心编号	直径/cm	长度/cm	孔隙度,%	渗透率/10^-3μm²
1	2.56	6.03	16.12	159
2	2.53	6.66	13.42	76.4

实验编号	级差	岩心类型	孔隙度,%	含油饱和度,%	渗透率/10^-3μm²	采收率,%
实验编号	级差	岩心类型	孔隙度,%	含油饱和度,%	渗透率/10^-3μm²	水驱	总计	提高
1#	2.3	高渗	18.85	66.88	234.6	52.75	78.05	25.3
1#	2.3	低渗	11.44	64.26	102	39.31	56.81	17.5
2#	3.7	高渗	17.41	68.92	418.84	48.14	74.64	26.5
2#	3.7	低渗	12.42	66.24	113.2	18.4	44	25.6
3#	4.2	高渗	18.34	70.23	405.3	52.14	74.78	22.64
3#	4.2	低渗	13.53	66.23	96.5	0	31.2	31.2
4#	5.5	高渗	19.34	69.65	469.15	52.47	76.23	23.76
4#	5.5	低渗	12.65	67.23	85.3	0	15.4	15.4
5#	7.6	高渗	21.38	67.65	592.8	51.85	81.5	29.65
5#	7.6	低渗	12.85	63.52	78	0	0	0
6#	2.08*	高渗	16.12	62.6	159	72.72	81.92	9.2
6#	2.08*	低渗	13.42	61.1	76.4	26.35	44.85	18.5