Study on the Adaptability of Drag-Increasing In-Situ Gel Profile Control Agent in Bohai Offshore Oilfield

doi:10.12422/j.issn.1006-396X.2025.05.004

Abstract

Abstract:

To ensure the effect of several rounds of profile control in Bohai oilfield, the adaptability of a drag-increasing in-situ gel profile control agent was investigated specifically in the study. The gelation property, thermal stability and micromorphology after gelation were measured by viscosimetry, rheological analysis and scanning electron microscope respectively. The injectivity, plugging property, selectivity and enhanced oil recovery effect of the profile control agent were investigated by sand packing experiments. The results show that the profile control agent has low initial viscosity, excellent injectability and deep migration performance, and weak chromatographic separation behavior in the reservoir. At the reservoir temperature of 65 ℃, it has a long gelation time, high gelation viscosity and good thermal stability. After gelation, it has a three-dimensional network structure with microspheres as cross-linked nodes inside, and demonstrates shear thickening characteristic at a shear rate of 4~12 s?1. Additionally, the profile control agent possesses excellent selective plugging performance and preferentially enters the breakthrough area to form plugging, , while maintaining a low oil plugging rate in the oil layers. The profile control agent shows a significant effect on enhancing oil recovery and the increase in crude oil recovery rate reaches 15.0%~23.0% after injecting 1.000 pore volume (PV). Generally, the drag-increasing in-situ gel profile control agent can adapt to the reservoir characteristics of Bohai offshore oilfield well, and realize in-depth profile control in the reservoir.

Key words: Profile control, Drag-increasing in-situ gel, Bohai offshore oilfield, Adaptability, Oil recovery

摘要：

为确保渤海海上油田多轮次调剖效果，对一种增阻型就地凝胶调剖剂的油藏适应性进行了系统研究。采用黏度法、流变分析、扫描电镜等分别表征了调剖剂的成胶性、热稳定性及成胶后的微观形貌；通过填砂管实验，系统评价了调剖剂的色谱分离行为、注入性、封堵性、选择性及提高采收率效果。结果表明，该调剖剂初始黏度低，注入性及深部运移性能良好，且油藏中的色谱分离行为弱；在油藏温度为65 ℃的条件下，调剖剂成胶时间长，成胶黏度高，热稳定性良好，成胶后呈以微球为交联节点的三维网络结构，在剪切速率为4~12 s^-1时具有剪切增稠特性；调剖剂具有优良的选择性封堵性能，能优先进入油藏窜流区域形成封堵，对油层的堵油率低；该调剖剂提高采收率效果明显，注入1.000 PV后，原油采收率增幅达15.0%~23.0%。总之，增阻型就地凝胶调剖剂能较好地适应渤海海上油田油藏特征，可实现油藏深部调剖。

关键词: 调剖, 增阻型就地凝胶, 渤海海上油田, 适应性, 原油采收率

CLC Number:

TE35

Changting PANG, Yanyue LI, Wenbo BAO, Hui LI, Lihua XIAO, Ye JU. Study on the Adaptability of Drag-Increasing In-Situ Gel Profile Control Agent in Bohai Offshore Oilfield[J]. Journal of Petrochemical Universities, 2025, 38(5): 30-38.

庞长廷, 李彦阅, 鲍文博, 黎慧, 肖丽华, 鞠野. 增阻型就地凝胶调剖剂在渤海海上油田适应性研究[J]. 石油化工高等学校学报, 2025, 38(5): 30-38.

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URL: https://journal.lnpu.edu.cn/syhg/EN/10.12422/j.issn.1006-396X.2025.05.004

https://journal.lnpu.edu.cn/syhg/EN/Y2025/V38/I5/30

Figures/Tables 8

Fig.1 Gelatinization results of drag-increasing profile control agent gelation.

Fig.2 Viscosity retention rate results of drag-increasing profile control agent after gelation

Fig.3 Chromatographic separation and determination results of resistance increasing profile control agent

Fig.4 Measurement results of injectivity and deep migration performance of drag increasing profile control agent and weak gel profile control agent

Fig.5 Comparison of the plugging properties of drag-increasing profile control agent and weak gel profile control agent

Table 1 Evaluation of permeability selectivity for retardation-type profile control agents and weak gel profile control agents in two parallel sand-filled tubes

调剖剂类型	渗透率极差	层位	水测渗透率/mD		调剖剂的进入率/%	封堵率/%	后续注水分流率/%
调剖剂类型	渗透率极差	层位	调剖前	调剖后	调剖剂的进入率/%	封堵率/%	调剖前	调剖后
增阻型调剖剂	5.1	低渗透层	1 492	1 319	10.5	11.6	26.7	59.4
	5.1	高渗透层	7 612	700	89.5	90.8	73.3	40.6
	6.3	低渗透层	1 517	1 382	7.8	8.9	19.1	58.3
	6.3	高渗透层	9 556	936	92.2	90.2	81.9	41.7
	8.7	低渗透层	1 505	1 458	3.8	3.1	10.6	53.1
	8.7	高渗透层	13 094	1 401	96.2	89.3	89.4	46.9
弱凝胶调剖剂	6.2	低渗透层	1 523	166	16.1	89.1	19.4	17.7
弱凝胶调剖剂	6.2	高渗透层	9 443	2 200	83.9	76.7	80.6	82.3

Fig.6 Oil water selectivity test results of drag increasing profile control agent and weak gel profile control agent

Fig.7 The enhanced oil recovery results of drag-increasing profile control agent and weak gel

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