Experimental Study on Oil/Water Relative Permeability in Fractured Reservoirs in Shunbei Oilfield, Tarim Basin

doi:10.7657/XJPG20250412

Abstract

Abstract:

The fault-controlled fractured reservoirs in the Shunbei oilfield are characterized by strong heterogeneity and complex oil-water movement patterns, making traditional homogeneous models fail to accurately characterize relative permeability. This study proposes a physical simulation method based on modular fracture networks. Regarding the characteristics of natural fractures in carbonate reservoirs, corresponding modular fracture network physical models with varying fracture complexity are designed, and the oil-water displacement experiments are conducted to obtain displacement parameters for different fracture models. On this basis, oil/water relative permeabilities are calculated, and the relative permeability charts are plotted. The obtained oil/water relative permeability curves are analyzed and validated using actual production data of wells in the fractured reservoirs to understand the variations of reservoir performance in the Shunbei oilfield.

Key words: Shunbei oilfield, fractured reservoir, carbonate rock, relative permeability, chart, waterflooding effect

CLC Number:

TE122.1

YUN Lu, WANG Yang, CAO Fei, PAN Lin, WANG Xiao. Experimental Study on Oil/Water Relative Permeability in Fractured Reservoirs in Shunbei Oilfield, Tarim Basin[J]. Xinjiang Petroleum Geology, 2025, 46(4): 485-491.

Figures/Tables 9

Table 1.

Fig. 1.

Table 2.

Table 3.

Table 4.

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Table 5.

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实验模型边长/cm	裂缝宽度/cm	裂缝总面积/cm²	理论孔隙度/%
1	0.20	15.480	19.71
	0.10	8.270	10.53
	0.05	4.200	5.43
3	0.20	7.680	9.78
	0.10	3.920	4.90
	0.05	1.980	2.52
5	0.20	5.304	6.75
	0.10	2.692	3.43
	0.05	1.356	1.73

参数	实验条件	研究区	相似性判断
几何相似性	模型岩块边长为1 cm、3 cm和5 cm	研究区破碎岩块大小为数厘米不等	模型岩块规模与研究区岩心碎块规模相似
几何相似性	基质几乎无储渗能力，孔隙度、渗透率均为裂缝贡献	碳酸盐岩基质孔渗不发育，主要为缝洞渗透率	流动通道与渗透率相似
动力相似性	压差为0.1~10.0 MPa	生产压差为0.1~10.0 MPa	压差相似
动力相似性	温度为室温25 ℃	温度为100~140 ℃	温度主要影响流体性质，由于仪器无法达到储集层高温，本文采用与研究区流体性质近似的流体来达到相似性
物质相似性	实验用油密度为0.87 g/cm³，黏度为 50.09 mPa·s；实验用地表水密度为1.00 g/cm³，黏度0.89 mPa·s	原油密度为0.76~0.87 g/cm³，地下原油黏度为15.00~73.00 mPa·s；地层水密度为1.12 g/cm³，黏度为1.02 mPa·s	流体物理性质相似

实验模型边长/cm	抽真空时间/min	围压/ MPa	吸入夹持器的水体积/mL	驱替出夹持器的水体积/mL	模型中束缚水体积/mL	束缚水饱和度/ %
1	30	5	35.95	27.99	7.96	22.14
3	30	5	24.30	21.52	2.78	11.44
5	30	5	22.96	19.47	3.49	15.20

实验序号	围压/ MPa	压差/ MPa	吸入液体质量/g	吸入液体体积/mL	驱替液体质量/g	驱替液体体积/mL	实验序号	围压/ MPa	压差/ MPa	吸入液体质量/g	吸入液体体积/mL	驱替液体质量/g	驱替液体体积/mL
1	15	0.04	5.29	2.03	99.47	99.65	11	20	0.15	3.16	1.21	100.26	100.35
2	15	0.05	2.77	1.06	99.13	99.23	12	20	0.16	6.99	2.68	101.03	101.25
3	15	0.06	7.66	2.94	95.49	95.73	13	20	0.17	4.11	1.58	96.59	96.74
4	15	0.07	3.59	1.38	90.23	90.34	14	20	0.18	8.24	3.16	103.72	104.02
5	15	0.10	8.00	3.07	98.58	98.88	15	20	0.19	3.74	1.43	96.65	96.72
6	15	0.10	5.06	1.94	100.79	100.97	16	25	0.20	7.77	2.98	94.12	94.41
7	15	0.11	11.14	4.27	99.11	99.53	17	25	0.23	4.19	1.61	97.49	97.65
8	15	0.12	9.73	3.73	102.96	103.30	18	25	0.25	13.42	5.14	98.25	98.79
9	15	0.13	17.10	6.56	99.54	100.14	19	25	0.27	5.89	2.26	102.70	102.93
10	20	0.14	14.77	5.66	101.67	102.23	20	25	0.29	11.15	4.27	99.45	99.87

深度/ m	含油饱和度/ %	计算比采油指数/ （m³·d^-1·MPa^-1·m^-1）	试井比采油指数/ （m³·d^-1·MPa^-1·m^-1）	误差/ %
8 169—8 173	66.3	26.4	24.6	7.4
8 188—8 196	65.9	40.3	37.9	6.5
8 178—8 182	66.4	36.5	35.1	3.9
8 209—8 222	67.2	61.5	56.3	9.2