注CO2改善河南双河油田低渗储层注水能力机理研究

doi:10.13809/j.cnki.cn32-1825/te.2024.01.008

摘要/Abstract

摘要：

针对双河油田低渗储层注水能力差、注水水质不达标和高凝原油蜡沉积等问题，通过自主设计的水-CO₂储层注入能力评价装置，开展流动性实验、CO₂驱油实验，结合岩心扫描电镜等测试手段，明确双河低渗储层注水能力差的主要机制，探索CO₂改善低渗储层注入能力的主要机理。结果表明，产出水中的悬浮颗粒和油中蜡晶等组分的沉积可导致孔隙堵塞，从而降低储层的注水能力。CO₂对产出水中无机悬浮颗粒及岩石碱性矿物、碳酸盐岩矿物有明显溶蚀作用，是显著提高储层注水能力的主要机理。CO₂可溶解在岩石表面的原油蜡质组分沉积，有效改善储层注水能力。同时，CO₂驱提高采收率效果明显，采收率提高13.01%~21.51%，后续水驱进一步提高5.40%~6.04%。研究表明：注CO₂可显著改善双河油田低渗储层注入能力，为CO₂增注驱油技术在现场应用提供理论支撑。

关键词: 低渗储层, 高凝原油, 蜡沉积, 注水水质, CO₂增注技术

Abstract:

Addressing issues such as poor water injection capacity, substandard water quality and wax deposition of high pour point crude oil in low permeability reservoirs of Shuanghe Oilfield in Henan, an independently designed water-CO₂ reservoir injection capability evaluation device was utilized to conduct flowability experiments and CO₂ displacement tests. Combined with core scanning electron microscopy and other testing methods, the main mechanism of poor water injection capacity of Shuanghe low permeability reservoirs was clarified, and the main mechanism of CO₂ improving the injection capacity of low permeability reservoirs was explored. The results show that the deposition of suspended particles in the produced water and wax crystals in the oil can lead to pore blockage, thereby reducing the water injection capacity of the reservoir. CO₂ has a significant dissolving effect on inorganic suspended particles in produced water and on alkaline minerals and carbonate minerals in rocks, which is the main mechanism for significantly enhancing the reservoir's water injection capacity. CO₂ can dissolve paraffin deposits on the rock surface, effectively improving the reservoir's water injection capability. At the same time, the effect of CO₂ flooding is obvious, the recovery rate is increased by 13.01% ~ 21.51%, and the subsequent water flooding is further increased by 5.40% ~ 6.04%. This study shows that CO₂ injection can significantly improve the injection capacity of low permeability reservoirs in Shuanghe Oilfield, and provides theoretical support for the field application of CO₂injection and oil displacement technology.

Key words: low permeability reservoir, high pour point crude oil, wax deposition, water quality of injection, CO₂ injection technology

中图分类号:

TE348

孙宜丽. 注CO₂改善河南双河油田低渗储层注水能力机理研究[J]. 油气藏评价与开发, 2024, 14(1): 55-63.

SUN Yili. Mechanism of CO₂ injection to improve the water injection capacity of low permeability reservoir in Shuanghe Oilfield in Henan[J]. Petroleum Reservoir Evaluation and Development, 2024, 14(1): 55-63.

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编号	平均渗透率/10^-3μm²	平均孔隙度/%	实验方案	岩心组成
1	13.2	13.6	0.1 mL/min水驱+气驱+后续水驱	1-14/39-2、1-14/39-3、2-13/39-1、2-17/39-2、3-18/33-4、4-8/40-3
2	3.68	13.5	0.1 mL/min水驱+气驱+后续水驱	2-18/39-1、3-18/38-5、3-14/38-1、3-14/38-2、3-14/38-3

岩心编号	类型	渗透率/10^-3μm²	启动压力/kPa
岩心编号	类型	渗透率/10^-3μm²	注气前	注气后
4-09/40-3	注清水	27.197	47	42
3-18/33-9	注产出水	30.753	31	9
2-17/39-3	注清水	9.219	66	57
2-17/39-1	注产出水	9.362	107	104

注CO₂改善河南双河油田低渗储层注水能力机理研究

Mechanism of CO₂ injection to improve the water injection capacity of low permeability reservoir in Shuanghe Oilfield in Henan

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岩心编号	渗透率/ 10^-3μm²	水样	水驱/ PV	CO₂/ PV	水驱/ PV
3-18/33-9	30.753	产出水	10	0.1	10
4-09/40-3	27.197	清水	10	0.1	10
2-17/39-1	9.362	产出水	10	0.1	10
2-17/39-3	9.219	清水	10	0.1	10
2-23/39-3	1.168	产出水	15	0.1	15
2-17/39-4	1.743	清水	15	0.1	15

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