大庆外围油田CO2近混相驱特征图版的建立

doi:10.13809/j.cnki.cn32-1825/te.2020.03.007

Abstract

Abstract:

At present, the oil recovery in the CO₂ oil displacement area of the peripheral oilfields in Daqing is mainly predicted by numerical simulation with no empirical formulas. In order to solve this problem, firstly, an heterogeneous ideal model of miscible, near-miscible and immiscible by CO₂flooding based on the basic physical properties and PVT parameters of the peripheral oil field in Daqing oilfield is established. Secondly, three kinds of characteristic curves of CO₂ flooding are defined, including carbon content-accumulation of oil, type A and type B. The feature curve is used to predict the recovery rate in the model, and the calculation method of characteristic curve suitable for CO₂ near-miscible flooding modes is optimized. On this basis, the carbon content and recovery degree chart suitable for S block is established, and compared with the actual performance of S block. A-type gas drive characteristic curve is selected for the further establishment of the CO₂ near-miscible drive chart, and this improved chart is applied to predict the recovery rate of S block. The results show that the recovery rate predicted by the CO₂ near-miscible flooding chart is close to that predicted by the field test of S block. This method can predict the recovery rate of CO₂ flooding simply and quickly, and has guiding significance for the next development and evaluation of S block and similar blocks.

Key words: CO₂ flooding, peripheral oilfields in Daqing, near-miscible flooding, characteristic curve, recovery rate prediction

CLC Number:

TE357

Xin WANG,Min LI. Establishment of the characteristic chart for CO₂ near-miscible flooding of peripheral oilfields in Daqing[J]. Reservoir Evaluation and Development, 2020, 10(3): 45-50.

Figures/Tables 10

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References 16

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驱替类型	节点数/个	网格精度/ （m×m×m）	层数	渗透率/ 10^-3 μm²	孔隙度/ %	井底流压/MPa	注入压力/MPa	PVT	最小混相压力/MPa
混相	90×110×1	10×10×5	1	2	12	5	38	B区块油样数据	16.6
近混相	90×110×1	10×10×5	1	2	12	5	38	S区块油样数据	32.2
非混相	90×110×1	10×10×5	1	2	12	5	38	F区块油样数据	41.3

混相系数	驱替类型	初期	0.04 HCPV	0.2 HCPV	0.4 HCPV	0.6 HCPV	1.5 HCPV
全混相体积系数	混相驱	55.3	63.2	62.9	60.5	61.2	50.4
	近混相驱	4.5	9.6	11.0	10.1	9.6	9.2
	非混相驱	0	0	0	0	0	0
半混相体积系数	混相驱	44.7	36.8	37.2	39.5	38.6	49.7
	近混相驱	84.4	74.0	76.2	88.4	78.5	31.6
	非混相驱	100	96.3	63.2	0.2	0	0
非混相体积系数	混相驱	0	0	0	0	0	0
	近混相驱	11.1	16.3	12.8	1.5	11.9	59.2
	非混相驱	0	3.8	36.8	99.8	99.9	99.9

气驱特征曲线类型	驱替类型	特征曲线法计算采收率/%	数模计算采收率/%	误差/%
含碳率-累产油关系曲线	混相驱	26.0	26.2	0.7
	近混相驱	23.2	23.8	2.4
	非混相驱	18.9	19.4	2.2
A型气驱特征曲线	混相驱	25.6	26.2	2.2
A型气驱特征曲线	近混相驱	23.1	23.8	2.3
B型气驱特征曲线	混相驱	25.5	26.2	2.3
	近混相驱	23.1	23.8	2.7
	非混相驱	16.3	19.4	15.9

Establishment of the characteristic chart for CO₂ near-miscible flooding of peripheral oilfields in Daqing

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Establishment of the characteristic chart for CO2 near-miscible flooding of peripheral oilfields in Daqing

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Establishment of the characteristic chart for CO₂ near-miscible flooding of peripheral oilfields in Daqing