大庆厚油层内各结构单元分流率变化特征实验研究

doi:10.13809/j.cnki.cn32-1825/te.2023.02.012

Abstract

Abstract:

In order to improve the understanding of the fractional rate law of injection and production ends in each structural unit of intraformational heterogeneous reservoir, aiming at the multi section and multi rhythm characteristics of thick oil layer in Lamadian Oilfield, Daqing, a model of intraformational heterogeneous reservoir is constructed by the “separate injection and separate production” core, and the effects of permeability gradient and injection speed on the fractional rate change law of water flooding are studied by physical simulation experiment. The results show that when water flooding reaches 0.4 PV, there is an inflection point in the flow rate curve. At the injection end, before 0.4 PV the injected water mainly enters into the high permeability layer, and after 0.4 PV, the liquid absorption of the middle and low permeability layer increases. For the positive rhythm reservoir, with the increase of permeability gradient, the swept volume of medium low permeability layer decreases and the recovery factor decreases; With the increase of the average permeability, the swept volume of the low and medium permeability layer increases, and the water flooding recovery increases. For the compound rhythm reservoir, the positive and negative compound rhythm is greater than the negative compound rhythm. When the injection rate is 0.6 mL/min at the injection end of heterogeneous core, with the increase of number of pore volumes（PV）, the fractional flow rate of high permeability layer increases, while that of low permeability layer decreases. When the injection rate is 0.9 mL/min and 1.2 mL/min, with the increase of number of pore volumes（PV）, the fractional flow rate of high permeability layer increases first and then decreases, while that of low permeability layer decreases first and then increases. With the increase of injection rate, the recovery rate and its percentage in the total recovery rate of low and medium permeability layers increase gradually. The research results have a certain guiding significance for the understanding of the mechanism of the split ratio at both ends of the injection and production in the deep heterogeneous reservoir.

Key words: thick oil layer, water drive, fractional flow rate of injection and production ends, influencing factors, mechanism analysis, intra-layer heterogeneity, Daqing Oilfield

CLC Number:

TE357

PEI Xiuling, LI Jiaqi, MA Xufei, ZHANG Aixiang, ZHANG Leilei, LU Xiangguo, HE Xin. Experimental study on change characteristics of fractional flow rate of each structural unit in thick oil reservoir of Daqing Oilfield[J].Reservoir Evaluation and Development, 2023, 13(2): 233-239.

Figures/Tables 10

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References 16

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岩心部位	渗透率（10^-3 μm²）
岩心部位	岩心Ⅰ（级差5）	岩心Ⅱ（级差8）	岩心Ⅲ（级差20）
上部	200	100	30
中部	500	400	300
下部	1 000	800	600

岩心编号	平均渗透率（10^-3μm²）	含油饱和度（%）	采收率（%）
岩心Ⅰ（级差5）	566.67	70.14	31.88
岩心Ⅱ（级差8）	433.33	70.48	29.70
岩心Ⅲ（级差20）	310.00	68.00	25.19

注入阶段	岩心编号	高渗层		中渗层		低渗层
注入阶段	岩心编号	采收率（%）	采收率占比（%）	采收率（%）	采收率占比（%）	采收率（%）	采收率占比（%）
0~0.4 PV	岩心Ⅰ	14.19	64.62	5.81	26.46	1.96	8.92
	岩心Ⅱ	17.40	74.31	4.39	18.76	1.62	6.93
	岩心Ⅲ	15.38	73.73	4.90	23.50	0.58	20.87
0.4 PV至水驱结束	岩心Ⅰ	17.36	54.45	10.20	31.99	4.32	13.56
	岩心Ⅱ	20.78	69.97	6.42	21.62	2. 50	8.42
	岩心Ⅲ	17.21	68.32	7.02	27.86	0.96	25.19

岩心编号	注入速度（mL/min）	采收率（%）
岩心Ⅰ	0.6	29.53
	0.9	31.89
	1.2	33.11

岩心编号	注入阶段	注入速度（mL/min）	高渗透层		中渗透层		低渗透层
岩心编号	注入阶段	注入速度（mL/min）	采收率（%）	采收率占比（%）	采收率（%）	采收率占比（%）	采收率（%）	采收率占比（%）
岩心Ⅰ	0~0.4 PV	0.6	15.00	66.77	5.20	23.15	2.27	10.09
		0.9	14.19	64.62	5.81	26.46	1.96	8.92
		1.2	16.76	56.88	8.31	28.21	4.39	14.91
	0.4 PV至水驱结束	0.6	17.93	60.72	7.73	26.19	3.87	13.09
		0.9	17.36	54.45	10.20	31.99	4.32	13.56
		1.2	16.89	51.02	10.20	30.82	6.01	18.16

Experimental study on change characteristics of fractional flow rate of each structural unit in thick oil reservoir of Daqing Oilfield

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