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

摘要/Abstract

摘要：

针对塔河油田强底水砂岩油藏开发后期井间剩余油难动用,常规提高采收率方法不适用的难题,探索开展了强底水砂岩油藏CO₂驱技术的可行性研究。利用室内实验、数值模拟和常规油藏工程相结合的方法,开展了底水砂岩油藏CO₂驱机理研究,确定了塔河底水砂岩油藏 CO₂的最小混相压力为29.6 MPa,初步明确了CO₂驱具有膨胀作用、扩大横向波及作用等主要机理。CO₂在油水中的溶解分配比为4:1左右,CO₂驱可以提高采收率12.5 %,明确了底水砂岩油藏CO₂驱具有较好的可行性。研究结果为塔河底水砂岩油藏CO₂驱先导试验提供了技术支撑。

关键词: 高耗水条带, 数值模拟, 正交实验, 影响因素分析, 塔河油田, 强底水, 砂岩油藏, CO₂驱, 可行性研究

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

中图分类号:

TE341

刘学利,郑小杰,谭涛等. 塔河强底水砂岩油藏CO₂驱机理实验研究[J]. 油气藏评价与开发, 2020, 10(6): 115-120.

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

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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

塔河强底水砂岩油藏CO₂驱机理实验研究

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

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