塔河强底水砂岩油藏CO2驱机理实验研究

doi:10.13809/j.cnki.cn32-1825/te.2020.06.018

Abstract

Abstract:

In the later development stage of strong bottom water sandstone reservoir of Tahe Oilfield, the development effect of remaining oil between wells is poor, and the conventional EOR methods is inapplicable. In order to solve these problems, the feasibility of CO₂ flooding in this type of reservoir has been explored. By combining laboratory experiments, numerical simulation and conventional reservoir engineering, the CO₂ flooding mechanism for sandstone reservoir with strong bottom water has been studied, and the MMP of CO₂ used in Tahe sandstone reservoir with strong bottom water is determined to be 29.6 MPa, the main mechanism of CO₂ flooding is preliminarily defined to be such as swelling of oil and expansion of horizontal swept area, the dissolution and distribution ratio of CO₂ in oil and water is about 4:1, and the CO₂ flooding can increase the recovery by 12.5 %. All these show that CO₂ flooding in Tahe sandstone reservoir with strong bottom water is feasible. The research results lay a theoretical foundation for EOR technology of this kind of reservoir and provide a scientific basis for CO₂ flooding pilot test of Tahe bottom water sandstone reservoir.

Key words: high water consumption strip, numerical simulation, orthogonal experiment, influencing factor analysis, Tahe oilfield, strong bottom water, sandstone reservoir, CO₂ flooding, feasibility research

CLC Number:

TE341

LIU Xueli,ZHENG Xiaojie,TAN Tao,DOU Lian,XIE Shuang. Experiments on CO₂ flooding mechanism for Tahe sandstone reservoir with strong bottom water[J].Reservoir Evaluation and Development, 2020, 10(6): 115-120.

Figures/Tables 14

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Table 1

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Table 2

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Table 3

Table 4

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注入CO₂比例/ %	饱和压力/ MPa	地层压力下体积系数	溶解系数/ （m³·m^-3）
0	25.15	1.250	2.85
10	38.69	1.372	3.67
15	41.21	1.447	4.33
20	44.45	1.564	4.77
25	46.95	1.630	5.29

组号	试验因素
组号	注入速度A	渗透率级差B	渗透率变异系数C	地层系数D
1	800	3	0.2	k×h
2	1 200	5	0.4	0.5k×2h
3	1 600	7	0.6	0.4k×2.5h
4	2 000	9	0.8	0.2k×5h

试验号	试验因素				采出程度/ %
试验号	A	B	C	D	采出程度/ %
1	800	3	0.2	k×h	45.87
2	800	5	0.4	0.5k×2h	43.24
3	800	7	0.6	0.4k×2.5h	41.26
4	800	9	0.8	0.2k×5h	40.59
5	1 200	3	0.4	0.4k×2.5h	49.81
6	1 200	5	0.2	0.2k×5h	48.64
7	1 200	7	0.8	k×h	41.28
8	1 200	9	0.6	0.5k×2h	42.86
9	1 600	3	0.4	0.2k×5h	49.37
10	1 600	5	0.8	0.4k×2.5h	47.92
11	1 600	7	0.2	0.5k×2h	48.26
12	1 600	9	0.6	k×h	39.57
13	2 000	3	0.8	0.5k×2h	45.65
14	2 000	5	0.4	k×h	42.25
15	2 000	7	0.6	0.2k×5h	45.56
16	2 000	9	0.2	0.4k×2.5h	46.28

计算参数	因素号
计算参数	A	B	C	D
K₁	170.96	189.70	190.05	168.97
K₂	181.59	183.05	176.18	180.01
K₃	186.12	176.36	169.25	183.27
K₄	179.74	169.30	175.44	186.16
m₁	42.74	47.425	47.5125	42.242 5
m₂	45.397 5	45.762 5	44.045	45.002 5
m₃	46.53	44.09	42.312 5	45.817 5
m₄	44.935	42.325	43.86	46.54
级差R	3.79	5.1	5.2	4.297 5
主次顺序	C>B>D>A

Experiments on CO₂ flooding mechanism for Tahe sandstone reservoir with strong bottom water

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Experiments on CO2 flooding mechanism for Tahe sandstone reservoir with strong bottom water

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Experiments on CO₂ flooding mechanism for Tahe sandstone reservoir with strong bottom water