高温高压缝洞型油藏注N2驱提高采收率机理研究及实践

doi:10.13809/j.cnki.cn32-1825/te.2020.02.010

摘要/Abstract

摘要：

塔河油田碳酸盐岩缝洞型油藏具有复杂的地质特征,主要体现在储层发育有孔、缝、洞多种形态,空间展布连续性差,组合模式复杂,表层岩溶系统经风化淋漓形成残余缝洞储集空间。开发中底水易沿高角度裂缝窜进形成水锥,水窜通道外井间剩余油与残丘封存的“阁楼油”大量富集。前期通过物理模拟明确了缝洞型油藏注N₂利用密度差进行重力置换宏观机理,但对于置换的“阁楼油”和井间剩余油的驱替机理还不明确,通过开展模拟塔河缝洞型油藏55 MPa和130 ℃条件注入N₂对原油物性影响实验,揭示了注N₂在高温高压油藏条件下对原油的溶解膨胀增能、抽提溶解等微观作用机理,基于缝洞地质刻画成果制作可视化物理模型,通过可视化观察井间注N₂过程中重力置换和抑制水锥的驱替机理,经过现场实践进一步证明了技术的可行性和推广潜力。

关键词: 缝洞型油藏, N₂, 阁楼油, 重力置换, 水锥, 提高采收率

Abstract:

Carbonate fractured-vuggy reservoirs in Tahe oilfield have complex geological characteristics, which is mainly reflected in the various forms such as pore, fracture and cave developed in the reservoir, poor continuity of spatial distribution, complex combination mode, and the residual fracture-vuggy storage space formed in surface karst system by weathering. During the development, it is easy to form the bottom water coning along the high angle crack. The remaining oil between the wells outside the water channels and the “attic oil” stored by the residual fault are enriched in large quantities. In the earlier stage, the macroscopic mechanism of gravity displacement by using density difference in N₂ injection of seam-hole reservoir is clarified by means of physical simulation. However, the displacement mechanism of the “attic oil” and the residual oil between wells is not clear. Through the simulation experiments of the effects of the injected N₂ on the physical properties of crude oil under the conditions of 55 MPa and 130 ℃, the micro mechanism such as the effects of N₂ on dissolution, expansion, capacity increase, extraction and dissolution of crude oil under the condition of high temperature and high pressure reservoir. Based on the fractured-vuggy geological characterization, visual physical model is made to observe the displacement mechanism of gravity displacement and water coning suppression during N₂ injection. After field application, the feasibility and popularization potential of the technology are further proved.

Key words: fractured-vuggy reservoir, N₂, attic oil, gravity displacement, water coning, EOR

中图分类号:

TE357

谭涛,郭臣,陈勇等. 高温高压缝洞型油藏注N₂驱提高采收率机理研究及实践[J]. 油气藏评价与开发, 2020, 10(2): 60-64.

Tao TAN,Chen GUO,Yong CHEN, et al. Study and practice on mechanism of EOR by N₂ flooding in fractured-vuggy reservoirs with high temperature and high pressure[J]. Reservoir Evaluation and Development, 2020, 10(2): 60-64.

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组分	含量/mol%	组分	含量/mol%
N₂	0	nC₄	0.835
CO₂	0.378	iC₅	0.627
C₁	38.103	nC₅	3.569
C₂	2.359	C₆	0.712
C₃	0.792	C₇⁺	51.338
iC₄	1.287

高温高压缝洞型油藏注N₂驱提高采收率机理研究及实践

Study and practice on mechanism of EOR by N₂ flooding in fractured-vuggy reservoirs with high temperature and high pressure

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