低渗透裂缝型油藏多轮次调驱物理模拟实验研究

Abstract

Abstract:

According to the poor water flood development effects of a typical low permeability multi-fractured block, and based on the dynamic simulation experiment system and the production technology of the fractured 3D flat cores with low permeability of the unconventional reservoir, we carried out 9 groups of physical simulation flooding experiments to research the profile control effects of the fractured reservoir with low permeability in the different injection systems and injection rounds. The result showed that the weak gel system better fitted the fractured reservoir with low permeability, and plugged the micro fractures effectively. In addition, the optimized profile control system is composed of 0.1 % concentration of 8 million molecular weight polymer, 0.1 % concentration of the profile system solution of cross linking agent, and the protection slug. It improved 31.35 % of the oil recovery by three injection rounds. Furthermore, the effects of the multi-round profile control decreased. The injected rounds should be selected reasonably according to the international oil price and the actual situation on site.

Key words: low permeability, fractured reservoir, injection round, profile control, indoor displacement experiment

CLC Number:

TE357

Yang Zhao,Jingchun Wu,Fang Shi, et al. Physical simulation flooding test of multi-turn profile control in low permeability reservoir[J]. Reservoir Evaluation and Development, 2018, 8(1): 44-48.

Figures/Tables 8

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References 12

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岩心编号	渗透率/（10^-3μm²）	孔隙度,%	含油饱和度,%	注入体系	总注入轮次	单轮注入量/PV	总注入量/PV
1#	38.6	31.6	60.5	一	1	0.3	0.3
2#	37.8	30.8	59.3		2	0.15	0.3
3#	39.5	31.9	61.2		3	0.1	0.3
4#	40.3	32.3	61.9	二	1	0.3	0.3
5#	37.9	30.5	59.5		2	0.15	0.3
6#	39.6	31.2	60.8		3	0.1	0.3
7#	38.3	30.6	59.6	三	1	0.3	0.3
8#	37.5	29.8	58.5		2	0.15	0.3
9#	39.2	31.5	60.3		3	0.1	0.3

岩心编号	注入体系	总注入轮次	水驱采收率,%	措施后驱替效率提高值,%	总采收率,%	总注入量/PV	最高压差/MPa
1#	一	1	30.41	13.98	44.39	5.13	3.52
2#		2	29.58	17	46.58	5.35	3.36
3#		3	28.76	18.13	46.89	5.7	3.42
4#	二	1	31.72	26.79	58.51	6.83	4.85
5#		2	30.17	31.49	61.66	7.17	5.16
6#		3	29.35	33.14	62.49	7.87	5.36
7#	三	1	28.79	24.83	53.62	6.25	5.13
8#		2	30.06	29.56	59.62	7.11	5.28
9#		3	29.81	31.35	61.16	7.76	5.51

岩心编号	注入体系	轮次		注入量/PV	驱替效率提高值,%	总驱替效率提高值,%
1#	一	一轮		0.3	13.98	13.98
2#		二轮	第一次	0.15	10.15	17
2#		二轮	第二次		0.15	17	6.85
3#	三轮	第一次	0.1	8.15	18.13
		第二次		0.1		5.58
		第三次		0.1		4.4
4#	二	一轮		0.3	26.79	26.79
5#		二轮	第一次	0.15	18.75	31.49
5#		二轮	第二次		0.15	31.49	12.74
6#	三轮	第一次	0.1	15.03	33.14
		第二次		0.1		10.89
		第三次		0.1		7.22
7#	三	一轮		0.3	24.83	24.83
8#		二轮	第一次	0.15	16.23	29.56
8#		二轮	第二次		0.15	29.56	13.33
9#	三轮	第一次	0.1	13.9	31.35
		第二次		0.1		9.5
		第三次		0.1		7.95

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Physical simulation flooding test of multi-turn profile control in low permeability reservoir

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