Study and practice on mechanism of EOR by N<sub>2</sub> flooding in fractured-vuggy reservoirs with high temperature and high pressure

TAN Tao; GUO Chen; CHEN Yong; DOU Lian; HUI Jian

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

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

更新时间：2025-12-11

- Study and practice on mechanism of EOR by N₂ flooding in fractured-vuggy reservoirs with high temperature and high pressure
- Petroleum Reservoir Evaluation and Development Vol. 10, Issue 2, Pages: 60-64(2020)
- 作者机构：
  
  1. 中国石化西北油田分公司勘探开发研究院,新疆乌鲁木齐 830011中国石化碳酸盐岩缝洞型油藏提高采收率重点实验室,新疆,乌鲁木齐,830011
  2. 中国石化碳酸盐岩缝洞型油藏提高采收率重点实验室,新疆,乌鲁木齐,830011
- 作者简介：
- 基金信息：
- DOI：10.13809/j.cnki.cn32-1825/te.2020.02.010
  CLC： TE357
- Published：2020
- 稿件说明：
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TAN Tao, GUO Chen, CHEN Yong, et al. Study and practice on mechanism of EOR by N₂ flooding in fractured-vuggy reservoirs with high temperature and high pressure[J]. Petroleum Reservoir Evaluation and Development, 2020, 10(2): 60-64.
DOI：

TAN Tao, GUO Chen, CHEN Yong, et al. Study and practice on mechanism of EOR by N₂ flooding in fractured-vuggy reservoirs with high temperature and high pressure[J]. Petroleum Reservoir Evaluation and Development, 2020, 10(2): 60-64. DOI： 10.13809/j.cnki.cn32-1825/te.2020.02.010.

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N

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N

对原油物性影响实验

揭示了注N

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N

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。

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 macrosco

pic mechanism of gravity displacement by using density difference in N

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 N

on the physical properties of crude oil under the conditions of 55 MPa and 130 ℃

the micro mechanism such as the effects of N

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 N

injection. After field application

the feasibility and popularization potential of the technology are further proved.

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Related Author

YANG Xue

CHEN Zuhua

ZHANG Yixiao

LIU Hongguang

LI Qing

TAN Tao

YANG Ming

LIU Xueli

Related Institution

Research Institute of Exploration and Development, Sinopec Zhongyuan Oilfield Company

Research Institute of Exploration and Development, Sinopec East China Oil and Gas Company

Sinopec Northwest Oilfield Company

No.2 Tahe Oil Production Plant, Sinopec Northwest Oilfield Company, Korle

Petroleum Engineering School, Southwest Petroleum University

AI问答

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

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

摘要

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