Residual Oil Distribution Characteristics and Enhanced Oil Recovery Methods in Mid-late Stages of Steam Flooding of Heavy Oil Reservoirs

doi:10.19657/j.geoscience.1000-8527.2022.224

Abstract

Abstract:

Aiming at shallow and medium-deep heavy oil reservoirs in China, numerical simulation is used to reveal the steam flooding development pattern in different types of heavy oil reservoirs, and the distribution characteristics of the residual oil in the mid-late stages of steam flooding. Besides, the enhanced oil recovery method of mid-late-stage steam flooding of heavy oil reservoirs is elucidated. The results show that the steam flooding development pattern in the shallow heavy oil reservoirs is basically the same as that in the medium-deep heavy oil reservoirs. In the displacement stage, the performance is good with high and stable oil rate, high oil steam ratio (OSR), and low water cut. The development stage (after steam breakthrough) is also important for steam flooding development, but the oil steam ratio is obviously lower than that in the displacement stage, indicating that the steam thermal efficiency is markedly lower in this stage. Distribution characteristics of the residual oil in different heavy oil reservoirs are similar, showing clear vertical differences, i.e., the development degree of the upper pay zone is high with low residual oil saturation, while that of the lower pay zone is low with high residual oil saturation. The lower pay zone is the main target zone for residual oil extraction. Layer by layer reverse development (from bottom to top) and multi-component assistance are effective tools for the enhanced oil recovery (EOR) of mid-late-stage steam flooding. Our finding is of great significance to the development of similar reservoirs.

Key words: steam flooding, mid-late stage, residual oil, multi-component, enhanced oil recovery (EOR)

CLC Number:

TE341

SHI Lanxiang, LI Xiuluan, WANG Hongyuan, LUO Chihui, LIU Pengcheng. Residual Oil Distribution Characteristics and Enhanced Oil Recovery Methods in Mid-late Stages of Steam Flooding of Heavy Oil Reservoirs[J]. Geoscience, 2022, 36(06): 1585-1593.

Figures/Tables 18

References 22

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类型/值	浅层稠油	中深层稠油
目标油藏埋深/m	200	806
初始地层压力/MPa	2.0	8.06
初始油藏温度/℃	18	40
有效厚度/m	21	24.2
渗透率/10^-3 μm²	2 500	2 100
饱和度/%	75	75
孔隙度/%	30	31
地下脱气原油黏度/(mPa·s)	23 848@20 ℃	5 819@40 ℃

类型/值	浅层稠油	中深层稠油
目标油藏埋深/m	200	806
初始地层压力/MPa	2.0	8.06
初始油藏温度/℃	18	40
有效厚度/m	21	24.2
渗透率/10^-3 μm²	2 500	2 100
饱和度/%	75	75
孔隙度/%	30	31
地下脱气原油黏度/(mPa·s)	23 848@20 ℃	5 819@40 ℃

阶段	生产指标	新疆浅层	辽河中深层
热连通阶段 (吞吐阶段)	采出程度/%	21.50	24.8
	油汽比/(m³/sm³)	0.29	0.43
	含水率/%	77.7	69.2
	采油速度/%	2.09	2.41
驱替阶段 (上产+ 稳产阶段)	采出程度/%	18.44	19.0
	油汽比/(m³/sm³)	0.08	0.13
	含水率/%	91.8	88.3
	采油速度/%	1.82	2.31
	稳产时间/年	10	8
突破+ 剥蚀阶段 (递减阶段)	采出程度/%	16.53	15.9
	油汽比/(m³/sm³)	0.08	0.09
	含水率/%	92.6	91.9
	采油速度/%	1.70	1.64
合计	采出程度/%	56.46	59.7
	油汽比/(m³/sm³)	0.11	0.16
	含水率/%	89.6	86.4
	采油速度/%	1.87	2.12

阶段	生产指标	新疆浅层	辽河中深层
热连通阶段 (吞吐阶段)	采出程度/%	21.50	24.8
	油汽比/(m³/sm³)	0.29	0.43
	含水率/%	77.7	69.2
	采油速度/%	2.09	2.41
驱替阶段 (上产+ 稳产阶段)	采出程度/%	18.44	19.0
	油汽比/(m³/sm³)	0.08	0.13
	含水率/%	91.8	88.3
	采油速度/%	1.82	2.31
	稳产时间/年	10	8
突破+ 剥蚀阶段 (递减阶段)	采出程度/%	16.53	15.9
	油汽比/(m³/sm³)	0.08	0.09
	含水率/%	92.6	91.9
	采油速度/%	1.70	1.64
合计	采出程度/%	56.46	59.7
	油汽比/(m³/sm³)	0.11	0.16
	含水率/%	89.6	86.4
	采油速度/%	1.87	2.12

阶段	参数	新疆浅层	辽河中深层
热连通阶段 (吞吐阶段)	温度/℃	44.0	69.9
	压力/MPa	0.30	0.90
	剩余油饱和度/小数	0.64	0.67
驱替阶段 (上产+ 稳产阶段)	温度/℃	102.5	156.3
	压力/MPa	1.2	2.8
	剩余油饱和度/小数	0.48	0.48
突破+ 剥蚀阶段 (递减阶段)	温度/℃	132.0	183.9
	压力/MPa	1.1	2.1
	剩余油饱和度/小数	0.35	0.36