不同提液方式对强水驱海相砂岩油藏驱油效率影响的实验研究

李伟; 王亚会; 陈肖; 蒋鏖; 杨勇; 王伟峰

doi:10.19509/j.cnki.dzkq.2021.0030

不同提液方式对强水驱海相砂岩油藏驱油效率影响的实验研究

doi: 10.19509/j.cnki.dzkq.2021.0030

详细信息

作者简介:
李伟(1972-), 男, 高级工程师, 主要从事油田开发、油藏工程及油藏管理工作。E-mail: liwei1@cnooc.com.cn

中图分类号: TE357.1
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出版历程
- 收稿日期: 2020-08-09

Experimental study on the effect of different liquid extraction methods on the oil displacement efficiency of strong water flooding marine sandstone reservoirs

摘要

摘要: 南海东部海相砂岩强底水驱稠油油藏经过多年开发，面临油田综合含水高、采出程度低的问题，油井提液是改善开发效果、实现稳产增产的重要措施，目前国内外关于不同提液方式对驱油效率的影响研究较少。为此，基于PY油田主力油藏典型渗透率级别天然岩心，开展了实际油藏条件下的水驱油核磁共振实验研究，分析了高含水期中不同提液组合方式下驱油效率的变化，从不同孔隙类型的动用程度揭示了影响驱油效率变化的内在因素并优选出适合该类型油藏的提液方式。实验结果表明：在多次控幅提液方式下，较于其他提液方式驱油效率平均提高了6.08%，能大幅提高微孔与小孔的动用程度，孔隙动用程度平均增加了7.76%，提液效果最佳。该成果为海相砂岩稠油油藏制定合理提液技术政策提供了依据。
- 海相砂岩 /
- 强水驱 /
- 核磁共振 /
- 驱油效率
Abstract: After decades of exploitation, marine sandstone heavy oil reservoirs with strong bottom water drive in eastern South China Sea shows features of low recovery factor and high water cut.Liquid extraction is an essential measure to increase and stabilize oil production during oilfield development.At present, there are few studies on the change of oil displacement efficiency under the different liquid extraction.For PY Oilfield, typical cores drilled from major oil producing layers were selected to conduct water flooding under reservoir condition by NMR experiments.The displacement efficiency was recorded and studied under different liquid extraction methods.The microscopic mechanism was concluded by analyzing the recovery results inside cores of different permeability types.The results indicate that the increment of oil recovery in micro and medium size pores can be greatly improved under multiple amplitude control liquid extraction in extra-high water-cut period, and the recovery efficiency can be increased by 6.08% compared with other extraction methods, and the extraction effect is the best.The results successfully give guidance to the proper application of liquid extraction methods in the marine heavy oil sandstone reservoirs.
- marine sandstone /
- strong water flooding /
- NMR /
- oil displacement efficiency

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图 1 核磁共振成像实验设备图

Figure 1. Diagram of MRI experimental equipment

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图 2 核磁共振成像实验流程示意图

Figure 2. Schematic diagram of the MRI experiment process

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图 3 4种提液方式下注入PV数与驱油效率曲线图

Figure 3. Injection of PV number and oil displacement efficiency in four types of extraction methods

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图 4 A-1和A-2核磁T2弛豫谱

Figure 4. A-1 and A-2 NMR T2 relaxation spectrum

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图 5 A-3和A-4核磁T2弛豫谱

Figure 5. A-3 and A-4 NMR T2 relaxation spectrum

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图 6 4种提液方式下孔隙的动用程度

Figure 6. Sweep degree of pores under four extration methods

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表 1 水驱油核磁成像提液方案设计

Table 1. Design of water-flooding nuclear magnetic imaging fluid extraction scheme

岩心渗透率/10^-3 μm²	原油黏度/(mPa·s)	提液方式
2 000	100	中高含水期多次控幅提液：0.1 mL/min至含水率80%或80%~90%+0.5 mL/min×5 PV+1 mL/min×5 PV+1.5 mL/min至含水率100%(驱替PV数>20 PV)
		特高含水期多次控幅提液：0.1 mL/min至含水率95%+0.5 mL/min×5 PV+1 mL/min×5 PV+1.5 mL/min至含水率100%
		中高含水期一次大幅提液：0.1 mL/min至含水率90%或>90%+1.5 mL/min至含水率100%
		特高含水期一次大幅提液：0.1 mL/min至含水率95%+1.5 mL/min至含水率100%

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表 2 取心岩样基本参数

Table 2. Basic parameters of coring rock samples

岩心编号	岩心长度/cm	岩心直径/cm	液测孔隙度/%	气测渗透率/10^-3 μm²
A-1	4.54	2.42	33.45	2 157.68
A-2	4.31	2.41	31.46	1 793.97
A-3	4.78	2.39	32.37	1 969.33
A-4	4.72	2.42	34.09	2 116.18

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表 3 地层水分析资料

Table 3. Analysis data of formation water

离子	Na⁺/K⁺	Ca²⁺	Mg²⁺	Cl^-	HCO^3-	SO₄^2-	总矿化度
质量浓度/(mg·L^-1)	10 166	695	191	17 409	76	0	28 537

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表 4 4种提液方式下岩心基础数据

Table 4. Basic data of cores in four types of extraction methods

岩心编号	孔隙度/%	渗透率/10^-3 μm²	饱和油/mL	束缚水饱和度/%	实验
A-1	33.45	2 157.68	5.60	19.84	高含水期一次大幅提液
A-2	31.46	1 793.97	5.05	18.43	特高含水期一次大幅提液
A-3	32.37	1 969.33	5.50	20.76	高含水期多次控幅提液
A-4	34.09	2 116.18	5.85	20.96	特高含水期多次控幅提液

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表 5 4种提液方式下驱油效率的实验结果

Table 5. Experiment result of oil displacement efficiency in four types extraction methods

提液方式	提液时含水率/%	单次提液幅度/%	驱油效率/%
高含水期一次大幅提液	95	-	54.46
特高含水期一次大幅提液	90	-	59.41
高含水期多次控幅提液	80	10.90, 3.64, 1.81	63.64
特高含水期多次控幅提液	95	9.83, 4.27, 0.85	62.39

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表 6 一次大幅提液不同驱替阶段累计孔隙度分量统计

Table 6. Accumulated porosity components in different displacement stages of a large-scale fluid extraction

岩心编号	提液方式	0.1 mL/min	1.5 mL/min	低速水驱	提液后
岩心编号	提液方式	阶段末φ/%			孔隙度分量减小值/%
A-1	中高一次	14.12	10.74	11.44	3.38
A-2	特高一次	13.01	10.28	11.65	2.73

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表 7 多次控幅提液不同驱替阶段累计孔隙度分量统计

Table 7. Accumulated porosity components in different displacement stages of multiple amplitude control fluid extraction

岩心编号	提液方式	0.1 mL/min	一次	二次	三次	一次提液	二次提液	三次提液
岩心编号	提液方式	φ/%				孔隙度分量减小值/%
A-3	中高多次控幅	15.84	12.58	11.59	11.16	3.26	0.99	0.43
A-4	特高多次控幅	13.49	10.62	9.38	8.33	2.87	1.24	1.05

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