Integrated “injection-soaking-production” fracturing-flooding experiment for tight reservoirs

Ma Li; Lu Cong; Guo Jianchun; Wu Jianfa; Song Yi; Shen Cheng; Li Junfeng

doi:10.7623/syxb202606009

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Integrated “injection-soaking-production” fracturing-flooding experiment for tight reservoirs

更新时间：2026-07-10

- Integrated “injection-soaking-production” fracturing-flooding experiment for tight reservoirs
- ACTA PETROLEI SINICA Vol. 47, Issue 6, Pages: 1244-1257(2026)
- 作者机构：
  
  1. 石油西南油气田公司页岩气研究院,四川,成都,中国,610051
  2. 西南石油大学油气藏地质及开发工程全国重点实验室,四川,成都,610500
  3. 页岩气地质评价与高效开发四川省重点实验室,四川,成都,610051
- 作者简介：
- 基金信息：
- DOI：10.7623/syxb202606009
  CLC： TE357
- Online First：02 July 2026，
  
  Published：2026
- 稿件说明：
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马莅, 卢聪, 郭建春, 吴建发, 宋毅, 沈骋, 黎俊峰. 致密储层“注入—焖井—生产”一体化压驱实验[J]. 石油学报, 2026, 47(6): 1244-1257.

Ma Li, Lu Cong, Guo Jianchun, et al. Integrated “injection-soaking-production” fracturing-flooding experiment for tight reservoirs[J]. ACTA PETROLEI SINICA, 2026, 47(6): 1244-1257.
马莅, 卢聪, 郭建春, 吴建发, 宋毅, 沈骋, 黎俊峰. 致密储层“注入—焖井—生产”一体化压驱实验[J]. 石油学报, 2026, 47(6): 1244-1257. DOI： 10.7623/syxb202606009.

Ma Li, Lu Cong, Guo Jianchun, et al. Integrated “injection-soaking-production” fracturing-flooding experiment for tight reservoirs[J]. ACTA PETROLEI SINICA, 2026, 47(6): 1244-1257. DOI： 10.7623/syxb202606009.

摘要

基于核磁共振在线监测技术

设计了致密储层“注入—焖井—生产”一体化压驱实验

通过核磁共振伪彩图分析“注入—焖井—生产”过程中基质—裂缝内油水流动规律

根据核磁共振

谱从微观尺度定量表征不同孔径介质中油水渗吸置换—动态驱替规律

探究基质渗透率、裂缝长度、注水速度以及焖井时间对压驱采油效果的影响。实验结果表明

裂缝在前期注入过程中可降低注水压力;在焖井过程中

裂缝增加驱替剂与基质中原油的接触面积

提高油水渗吸置换效率;在生产过程中

在驱油剂协同作用下可提高驱油效率。当缝长比从0增至2/3时

前期注水阶段中大孔及裂缝的采出程度增加且占据前期注水阶段驱油量的主要部分

驱替效率从48.73 % 提升至65.99 %; 当缝长比增至1(贯穿缝)时

注入流体沿裂缝优势通道窜流

微小孔及中孔采出程度降低

驱油效率下降至56.12 % 。当压驱注水速度从0.2 mL/min增至1.0 mL/min时

注入水沿储层高渗层窜流

减小水驱作用的面积

驱油效率由53.21 % 降至48.24 % 。在焖井过程中

微小孔及中孔中油相在渗吸作用下进入大孔及裂缝

即压驱注水后进行适度焖井

可强化基质与裂缝之间的油水置换作用

提高后期驱油效果。研究结果揭示了致密储层“注入—焖井—生产”一体化压驱作用机理

可有效指导压驱现场实施。

Abstract

An integrated "injection-soaking-production" fracturing-flooding experiment for tight reservoirs was designed utilizing online nuclear magnetic resonance (NMR) monitoring technology. Fluid flow patterns within the matrix and fractures during the "injection-soaking-production" cycle were analyzed via NMR pseudo-color imaging. Based on NMR

spectra

the mechanisms of oil-water imbibition-replacement and dynamic displ

acement in media with varying pore sizes were quantitatively characterized at the microscopic scale. Furthermore

the influences of matrix permeability

fracture length

injection rate

and soaking time on the pressure-driven oil recovery efficiency were investigated. Experimental results demonstrate that fractures effectively reduce injection pressure during the initial injection phase. During the soaking phase

fractures expand the contact area between the displacement agent and the crude oil within the matrix

thereby enhancing the oil-water imbibition and replacement efficiency. During the production phase

the synergistic effect of the displacement agent further improves oil recovery efficiency. When the fracture length ratio increases from 0 to 2/3

the recovery percentage of macropores and fractures during the initial waterflooding stage rises

accounting for the majority of oil recovery in this phase

and the displacement efficiency improves from 48.73 % to 65.99 % . However

when the fracture length ratio reaches 1 (penetrating fractures)

the injected fluid undergoes channeling through the dominant fracture pathways

leading to a decrease in the recovery percentage from micropores and mesopores

and a subsequent reduction in oil displacement efficiency to 56.12 % . As the water injection rate increases from 0.2 mL/min to 1.0 mL/min

the injected water channels through high-permeability zones

thereby reducing the sweep efficiency and causing the oil displacement efficiency to decrease from 53.21 % to 48.24 % . During the soaking phase

the oil phase within micropores and mesopores migrates into macropores and fractures via capillary imbibition; specifically

optimal soaking time following pressure-driven injection enhances the oil-water replacement between the matrix and fractures

improving subsequent displacement efficiency. These findings elucidate the integrated "injection-soaking-production" mechanism in tight reservoirs

providing effective guidance for the field implementation of pressure-driven

development.

关键词

Keywords

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