相渗曲线判断聚合物驱转注聚时机的应用方法

doi:10.13809/j.cnki.cn32-1825/te.2020.02.022

Abstract

Abstract:

The early polymer injection technology can further improve the polymer flooding effect, and the method to judge the time of polymer transfer by laboratory experiment and numerical simulation is relatively complex and limited in application. Based on the mechanism of oil-water relative permeability, an application method for quickly determining the time of injection and accumulation is established by using reservoir engineering method. The characteristics of the relative permeability curves of four reservoirs are obtained through laboratory experiments, and the influence of the water cut change rule, water cut rise rate, dimensionless production fluid（oil） index, oil-water mobility ratio and other characteristic parameters on the injection timing of polymer flooding under different reservoir conditions is analyzed by the reservoir engineering method. The results show that the above characteristic parameters are obviously different under different reservoir conditions. The injection time of polymer flooding should be determined by sorting the characteristic parameters according to the actual demand. Taking production as an example, the dimensionless production index, dimensionless production index, water cut rising rate and oil-water flow rate ratio determine that the water cut of the injection time for four reservoirs（BZ, JZ, QHD and SZ） is above 80 %, 79.9 %, 86 % and 34 %, respectively. According to the actual situation of the field, the time of polymer injection time can be determined quickly by analyzing the relative permeability curve with reservoir engineering method.

Key words: reservoir engineering, relative permeability curve, mobility ratio, injection time, polymer flooding

CLC Number:

TE357

Shijie ZHU,Leiting SHI,Jian ZHANG, et al. Application method of determining polymer injection timing with relative permeability curves[J]. Reservoir Evaluation and Development, 2020, 10(2): 128-134.

Figures/Tables 11

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油藏	岩性	尺寸/mm	孔隙度/%	气测渗透率/10^-3 μm²
BZ	砂岩	φ2.48×5.08	35.40	961.50
JZ	油浸砂岩	φ2.42×5.13	30.81	1 024.00
QHD	砂岩	φ2.53×4.92	38.20	8 384.20
SZ	砂岩	φ2.51×5.67	33.30	1 891.23

油藏	（Na⁺、K⁺）		Mg²⁺	CO₃^2-	HCO₃^-	SO₄^2-	Cl^-	矿化度
BZ	2 484	738	10	41	1 801	783	531	6 388
JZ	701	15	3	216	1 049	14	235	2 233
QHD	2 531	89	61	103	1 463	17	1 335	5 599
SZ	3 091	276	158	14	311	85	5 436	9 371

油藏名称	束缚水饱和度/ %	残余油饱和度/ %	等渗点含水饱和度/ %	等渗点相渗透率/μm²	残余油饱和度的水相渗透率/ μm²
BZ	43.10	25.00	59.50	0.032	0.133
JZ	33.29	25.25	55.00	0.160	0.844
QHD	9.90	29.80	49.00	0.118	0.274
SZ	16.70	47.50	36.40	0.057	0.117

油藏	含水率上升速率/%	无因次采液指数/%	无因次采油指数/%	油水流度比（M）/%
油藏	含水率上升速率/%	无因次采液指数/%	无因次采油指数/%	M≤1	M≤5	M≤10
BZ	<75	>80		<56	<83.1	<91.5
JZ	<78		>77.9	<57	<82.3	<92.3
QHD	<74		>86	<62	<83.2	<92.1
SZ	<34			<57	<84.9	<91.8

Application method of determining polymer injection timing with relative permeability curves

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